Wie kann ich ein Video in meiner Android App aufnehmen?

137

Wie kann ich eine Videoaufnahme auf Android aufnehmen?

Donner
quelle
Können wir das Audio in der vorhandenen Videospur aufnehmen?
Ahmad Arslan
Ein weiterer Dankeschön wird überprüft. Hilfreiche Antwort
Adnan Abdollah Zaki

Antworten:

165

Hier ist ein einfaches Beispiel für die Videoaufnahme mit dem MediaRecorder:

public class VideoCapture extends Activity implements OnClickListener, SurfaceHolder.Callback {
    MediaRecorder recorder;
    SurfaceHolder holder;
    boolean recording = false;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

        recorder = new MediaRecorder();
        initRecorder();
        setContentView(R.layout.main);

        SurfaceView cameraView = (SurfaceView) findViewById(R.id.CameraView);
        holder = cameraView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        cameraView.setClickable(true);
        cameraView.setOnClickListener(this);
    }

    private void initRecorder() {
        recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);

        CamcorderProfile cpHigh = CamcorderProfile
                .get(CamcorderProfile.QUALITY_HIGH);
        recorder.setProfile(cpHigh);
        recorder.setOutputFile("/sdcard/videocapture_example.mp4");
        recorder.setMaxDuration(50000); // 50 seconds
        recorder.setMaxFileSize(5000000); // Approximately 5 megabytes
    }

    private void prepareRecorder() {
        recorder.setPreviewDisplay(holder.getSurface());

        try {
            recorder.prepare();
        } catch (IllegalStateException e) {
            e.printStackTrace();
            finish();
        } catch (IOException e) {
            e.printStackTrace();
            finish();
        }
    }

    public void onClick(View v) {
        if (recording) {
            recorder.stop();
            recording = false;

            // Let's initRecorder so we can record again
            initRecorder();
            prepareRecorder();
        } else {
            recording = true;
            recorder.start();
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        prepareRecorder();
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        if (recording) {
            recorder.stop();
            recording = false;
        }
        recorder.release();
        finish();
    }
}

Es ist aus meinem Buch: Pro Android Media: Entwicklung von Grafik-, Musik-, Video- und Rich Media-Apps für Smartphones und Tablets

Vergessen Sie auch nicht, diese Berechtigungen in das Manifest aufzunehmen:

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
vanevery
quelle
29
Dies ist ein großartiges Beispiel. Ich hatte zuerst einige Probleme damit, es zum Laufen zu bringen. Mein Fehler bezog sich auf die Ausgabegröße der Datei von 0 Byte. Ich begann zu debuggen und der Täter stellte sich als record.prepare () heraus. Ich habe keine neue Ausgabedatei für den Rekorder festgelegt, sodass mein vorhandenes Video jedes Mal überschrieben wurde, wenn ich den Bildschirm berührte, um die Videoaufzeichnung zu stoppen. Hoffe, das hilft jemand anderem da draußen :-) Übrigens ist es erwähnenswert, dass Sie Ihrem Manifest auch die Berechtigungen RECORD_AUDIO, CAMERA und WRITE_EXTERNAL_STORAGE hinzufügen müssen, damit dieser Beispielcode funktioniert.
Lasse Samson
11
Bitte posten Sie auch XML-Datei
Nirav Ranpara
16
Hier ist das obige Beispiel mit Vorschau der Kamera: github.com/vanevery/Custom-Video-Capture-with-Preview
vanevery
3
WARNUNG! Wenn Sie dieses Beispiel verwenden, vergessen Sie nicht, die Methode finish () von der Zerstörung der Oberfläche zu löschen! Damit haben Sie die Möglichkeit, von anderen Aktivitäten zu dieser Aktivität zurückzukehren. Ich habe dort mehr als 2 Stunden verloren)
Divers
3
@vanevery das große Problem dieses Codes ist .. es erstellt zwei Dateien eine ist gut Aufnahme eine andere ist erstellen, wenn wir Recorder vorbereiten .. gibt es eine Möglichkeit, diese Datei zu entfernen, wenn wir es nicht aufzeichnen ..
Swap-IOS -Android
46

Hier ist ein weiteres Beispiel, das funktioniert

public class EnregistrementVideoStackActivity extends Activity implements SurfaceHolder.Callback {
    private SurfaceHolder surfaceHolder;
    private SurfaceView surfaceView;
    public MediaRecorder mrec = new MediaRecorder();
    private Button startRecording = null;

    File video;
    private Camera mCamera;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.camera_surface);
        Log.i(null , "Video starting");
        startRecording = (Button)findViewById(R.id.buttonstart);
        mCamera = Camera.open();
        surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        menu.add(0, 0, 0, "StartRecording");
        menu.add(0, 1, 0, "StopRecording");
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        switch (item.getItemId())
        {
        case 0:
            try {
                startRecording();
            } catch (Exception e) {
                String message = e.getMessage();
                Log.i(null, "Problem Start"+message);
                mrec.release();
            }
            break;

        case 1: //GoToAllNotes
            mrec.stop();
            mrec.release();
            mrec = null;
            break;

        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

    protected void startRecording() throws IOException 
    {
        mrec = new MediaRecorder();  // Works well
        mCamera.unlock();

        mrec.setCamera(mCamera);

        mrec.setPreviewDisplay(surfaceHolder.getSurface());
        mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mrec.setAudioSource(MediaRecorder.AudioSource.MIC); 

        mrec.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
        mrec.setPreviewDisplay(surfaceHolder.getSurface());
        mrec.setOutputFile("/sdcard/zzzz.3gp"); 

        mrec.prepare();
        mrec.start();
    }

    protected void stopRecording() {
        mrec.stop();
        mrec.release();
        mCamera.release();
    }

    private void releaseMediaRecorder(){
        if (mrec != null) {
            mrec.reset();   // clear recorder configuration
            mrec.release(); // release the recorder object
            mrec = null;
            mCamera.lock();           // lock camera for later use
        }
    }

    private void releaseCamera(){
        if (mCamera != null){
            mCamera.release();        // release the camera for other applications
            mCamera = null;
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (mCamera != null){
            Parameters params = mCamera.getParameters();
            mCamera.setParameters(params);
        }
        else {
            Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
            finish();
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.stopPreview();
        mCamera.release();
    }
}

camera_surface.xml

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<SurfaceView
    android:id="@+id/surface_camera"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1" />

<Button
    android:id="@+id/buttonstart"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/record_start" />

</RelativeLayout>

Und natürlich diese Erlaubnis in das Manifest aufnehmen:

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Milos Cuculovic
quelle
Hallo Überprüfen Sie dies: stackoverflow.com/questions/10594553/…
Ponmalar
Vielen Dank, Beispiel für vanevery ist das Speichern von Dateien mit einer Größe von 0 Byte, was nicht nützlich ist
user609239
Durch Klicken auf das Hardware-Menü werden Start- und Stoppaufzeichnungen angezeigt. In den Android-Tablets gibt es jedoch kein Hardware-Menü. Wie kann ich in diesem Szenario die Videoaufnahme starten und stoppen?
Karthick
Einige Optimierungen, um das Beispiel zu kompilieren, aber das hat wunderbar für mich funktioniert. Vielen Dank!
Gopherkhan
@Milos Kannst du mir sagen, wie ich das Markierungsbild in das Oberflächenvideo einbetten soll?
Ahmad Arslan
5

Sie zeichnen Audio und Video mit derselben MediaRecorder-Klasse auf. Es ist ziemlich einfach. Hier ist ein Beispiel .

Drakosha
quelle
1
Es gibt subtile Fehler in der Videoimplementierung in MediaRecorder, die aus unvorhersehbaren Gründen Segmentierungsfehler verursachen. Ich vermute, aus diesem Grund hat @Vishnuparsad diese Frage überhaupt erst gestellt.
Bobpoekert
Dann hätte er es erwähnen sollen :)
Drakosha
Das Aufnehmen von Videos erfordert etwas mehr Arbeit, da Sie sich mit der Vorschaufläche befassen müssen.
Vanevery
5

Diese Demo wird für Sie hilfreich sein ....

video.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ToggleButton
    android:id="@+id/toggleRecordingButton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true" />

<SurfaceView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/surface_camera"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_centerInParent="true"
    android:layout_weight="1" >
</SurfaceView>

Ihre Hauptaktivität: Video.java

 public class Video extends Activity implements OnClickListener,
    SurfaceHolder.Callback {

private static final String TAG = "CAMERA_TUTORIAL";

private SurfaceView mSurfaceView;
private SurfaceHolder mHolder;
private Camera mCamera;
private boolean previewRunning;
private MediaRecorder mMediaRecorder;
private final int maxDurationInMs = 20000;
private final long maxFileSizeInBytes = 500000;
private final int videoFramesPerSecond = 20;
Button btn_record;
boolean mInitSuccesful = false;
File file;
ToggleButton mToggleButton;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.video);

    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
    mHolder = mSurfaceView.getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    mToggleButton = (ToggleButton) findViewById(R.id.toggleRecordingButton);
    mToggleButton.setOnClickListener(new OnClickListener() {
        @Override
        // toggle video recording
        public void onClick(View v) {
            if (((ToggleButton) v).isChecked())
                mMediaRecorder.start();
            else {
                mMediaRecorder.stop();
                mMediaRecorder.reset();
                try {
                    initRecorder(mHolder.getSurface());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    });
}

private void initRecorder(Surface surface) throws IOException {
    // It is very important to unlock the camera before doing setCamera
    // or it will results in a black preview
    if (mCamera == null) 
    {
        mCamera = Camera.open();
        mCamera.unlock();
    }

    if (mMediaRecorder == null)
        mMediaRecorder = new MediaRecorder();

    mMediaRecorder.setPreviewDisplay(surface);
    mMediaRecorder.setCamera(mCamera);

    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);

    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);

    mMediaRecorder.setOutputFile(this.initFile().getAbsolutePath());

    // No limit. Don't forget to check the space on disk.
    mMediaRecorder.setMaxDuration(50000);
    mMediaRecorder.setVideoFrameRate(24);
    mMediaRecorder.setVideoSize(1280, 720);
    mMediaRecorder.setVideoEncodingBitRate(3000000);
    mMediaRecorder.setAudioEncodingBitRate(8000);

    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
    mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

    try {
        mMediaRecorder.prepare();
    } catch (IllegalStateException e) {
        // This is thrown if the previous calls are not called with the
        // proper order
        e.printStackTrace();
    }

    mInitSuccesful = true;
}

private File initFile() {
    // File dir = new
    // File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES),
    // this
    File dir = new File(Environment.getExternalStorageDirectory(), this
            .getClass().getPackage().getName());


    if (!dir.exists() && !dir.mkdirs()) {
        Log.wtf(TAG,
                "Failed to create storage directory: "
                        + dir.getAbsolutePath());
        Toast.makeText(Video.this, "not record", Toast.LENGTH_SHORT);
        file = null;
    } else {
        file = new File(dir.getAbsolutePath(), new SimpleDateFormat(
                "'IMG_'yyyyMMddHHmmss'.mp4'").format(new Date()));
    }
    return file;
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    try {
        if (!mInitSuccesful)
            initRecorder(mHolder.getSurface());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

private void shutdown() {
    // Release MediaRecorder and especially the Camera as it's a shared
    // object that can be used by other applications
    mMediaRecorder.reset();
    mMediaRecorder.release();
    mCamera.release();

    // once the objects have been released they can't be reused
    mMediaRecorder = null;
    mCamera = null;
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    shutdown();
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    // TODO Auto-generated method stub

}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub

}

}

MediaMetadataRetriever-Klasse

public class MediaMetadataRetriever {

 static {
        System.loadLibrary("media_jni");
        native_init();
    }

    // The field below is accessed by native methods
    @SuppressWarnings("unused")
    private int mNativeContext;

    public MediaMetadataRetriever() {
        native_setup();
    }

    /**
     * Call this method before setDataSource() so that the mode becomes
     * effective for subsequent operations. This method can be called only once
     * at the beginning if the intended mode of operation for a
     * MediaMetadataRetriever object remains the same for its whole lifetime,
     * and thus it is unnecessary to call this method each time setDataSource()
     * is called. If this is not never called (which is allowed), by default the
     * intended mode of operation is to both capture frame and retrieve meta
     * data (i.e., MODE_GET_METADATA_ONLY | MODE_CAPTURE_FRAME_ONLY).
     * Often, this may not be what one wants, since doing this has negative
     * performance impact on execution time of a call to setDataSource(), since
     * both types of operations may be time consuming.
     * 
     * @param mode The intended mode of operation. Can be any combination of 
     * MODE_GET_METADATA_ONLY and MODE_CAPTURE_FRAME_ONLY:
     * 1. MODE_GET_METADATA_ONLY & MODE_CAPTURE_FRAME_ONLY: 
     *    For neither frame capture nor meta data retrieval
     * 2. MODE_GET_METADATA_ONLY: For meta data retrieval only
     * 3. MODE_CAPTURE_FRAME_ONLY: For frame capture only
     * 4. MODE_GET_METADATA_ONLY | MODE_CAPTURE_FRAME_ONLY: 
     *    For both frame capture and meta data retrieval
     */
    public native void setMode(int mode);

    /**
     * @return the current mode of operation. A negative return value indicates
     * some runtime error has occurred.
     */
    public native int getMode();

    /**
     * Sets the data source (file pathname) to use. Call this
     * method before the rest of the methods in this class. This method may be
     * time-consuming.
     * 
     * @param path The path of the input media file.
     * @throws IllegalArgumentException If the path is invalid.
     */
    public native void setDataSource(String path) throws IllegalArgumentException;

    /**
     * Sets the data source (FileDescriptor) to use.  It is the caller's
     * responsibility to close the file descriptor. It is safe to do so as soon
     * as this call returns. Call this method before the rest of the methods in
     * this class. This method may be time-consuming.
     * 
     * @param fd the FileDescriptor for the file you want to play
     * @param offset the offset into the file where the data to be played starts,
     * in bytes. It must be non-negative
     * @param length the length in bytes of the data to be played. It must be
     * non-negative.
     * @throws IllegalArgumentException if the arguments are invalid
     */
    public native void setDataSource(FileDescriptor fd, long offset, long length)
            throws IllegalArgumentException;

    /**
     * Sets the data source (FileDescriptor) to use. It is the caller's
     * responsibility to close the file descriptor. It is safe to do so as soon
     * as this call returns. Call this method before the rest of the methods in
     * this class. This method may be time-consuming.
     * 
     * @param fd the FileDescriptor for the file you want to play
     * @throws IllegalArgumentException if the FileDescriptor is invalid
     */
    public void setDataSource(FileDescriptor fd)
            throws IllegalArgumentException {
        // intentionally less than LONG_MAX
        setDataSource(fd, 0, 0x7ffffffffffffffL);
    }

    /**
     * Sets the data source as a content Uri. Call this method before 
     * the rest of the methods in this class. This method may be time-consuming.
     * 
     * @param context the Context to use when resolving the Uri
     * @param uri the Content URI of the data you want to play
     * @throws IllegalArgumentException if the Uri is invalid
     * @throws SecurityException if the Uri cannot be used due to lack of
     * permission.
     */
    public void setDataSource(Context context, Uri uri)
        throws IllegalArgumentException, SecurityException {
        if (uri == null) {
            throw new IllegalArgumentException();
        }

        String scheme = uri.getScheme();
        if(scheme == null || scheme.equals("file")) {
            setDataSource(uri.getPath());
            return;
        }

        AssetFileDescriptor fd = null;
        try {
            ContentResolver resolver = context.getContentResolver();
            try {
                fd = resolver.openAssetFileDescriptor(uri, "r");
            } catch(FileNotFoundException e) {
                throw new IllegalArgumentException();
            }
            if (fd == null) {
                throw new IllegalArgumentException();
            }
            FileDescriptor descriptor = fd.getFileDescriptor();
            if (!descriptor.valid()) {
                throw new IllegalArgumentException();
            }
            // Note: using getDeclaredLength so that our behavior is the same
            // as previous versions when the content provider is returning
            // a full file.
            if (fd.getDeclaredLength() < 0) {
                setDataSource(descriptor);
            } else {
                setDataSource(descriptor, fd.getStartOffset(), fd.getDeclaredLength());
            }
            return;
        } catch (SecurityException ex) {
        } finally {
            try {
                if (fd != null) {
                    fd.close();
                }
            } catch(IOException ioEx) {
            }
        }
        setDataSource(uri.toString());
    }

    /**
     * Call this method after setDataSource(). This method retrieves the 
     * meta data value associated with the keyCode.
     * 
     * The keyCode currently supported is listed below as METADATA_XXX
     * constants. With any other value, it returns a null pointer.
     * 
     * @param keyCode One of the constants listed below at the end of the class.
     * @return The meta data value associate with the given keyCode on success; 
     * null on failure.
     */
    public native String extractMetadata(int keyCode);

    /**
     * Call this method after setDataSource(). This method finds a
     * representative frame if successful and returns it as a bitmap. This is
     * useful for generating a thumbnail for an input media source.
     * 
     * @return A Bitmap containing a representative video frame, which 
     *         can be null, if such a frame cannot be retrieved.
     */
    public native Bitmap captureFrame();

    /**
     * Call this method after setDataSource(). This method finds the optional
     * graphic or album art associated (embedded or external url linked) the 
     * related data source.
     * 
     * @return null if no such graphic is found.
     */
    public native byte[] extractAlbumArt();

    /**
     * Call it when one is done with the object. This method releases the memory
     * allocated internally.
     */
    public native void release();
    private native void native_setup();
    private static native void native_init();

    private native final void native_finalize();

    @Override
    protected void finalize() throws Throwable {
        try {
            native_finalize();
        } finally {
            super.finalize();
        }
    }

    public static final int MODE_GET_METADATA_ONLY  = 0x01;
    public static final int MODE_CAPTURE_FRAME_ONLY = 0x02;

    /*
     * Do not change these values without updating their counterparts
     * in include/media/mediametadataretriever.h!
     */
    public static final int METADATA_KEY_CD_TRACK_NUMBER = 0;
    public static final int METADATA_KEY_ALBUM           = 1;
    public static final int METADATA_KEY_ARTIST          = 2;
    public static final int METADATA_KEY_AUTHOR          = 3;
    public static final int METADATA_KEY_COMPOSER        = 4;
    public static final int METADATA_KEY_DATE            = 5;
    public static final int METADATA_KEY_GENRE           = 6;
    public static final int METADATA_KEY_TITLE           = 7;
    public static final int METADATA_KEY_YEAR            = 8;
    public static final int METADATA_KEY_DURATION        = 9;
    public static final int METADATA_KEY_NUM_TRACKS      = 10;
    public static final int METADATA_KEY_IS_DRM_CRIPPLED = 11;
    public static final int METADATA_KEY_CODEC           = 12;
    public static final int METADATA_KEY_RATING          = 13;
    public static final int METADATA_KEY_COMMENT         = 14;
    public static final int METADATA_KEY_COPYRIGHT       = 15;
    public static final int METADATA_KEY_BIT_RATE        = 16;
    public static final int METADATA_KEY_FRAME_RATE      = 17;
    public static final int METADATA_KEY_VIDEO_FORMAT    = 18;
    public static final int METADATA_KEY_VIDEO_HEIGHT    = 19;
    public static final int METADATA_KEY_VIDEO_WIDTH     = 20;
    public static final int METADATA_KEY_WRITER          = 21;
    // Add more here...
}
Mitul Goti
quelle
Hallo. Ich versuche, Ihren Code in meinem Projekt zu implementieren, aber die Funktion surfaceCreated wird nie aufgerufen.
REJH
@REJH wird beim Erstellen der Oberfläche aufgerufen, da diese Zeile eine mHolder.addCallback(this);Aktivitätsklasse anfügt, um Oberflächenereignisse zu verarbeiten. Möglicherweise kann Ihre IDE diesen Anruf nicht erkennen, aber er sollte aufgerufen werden.
vp_arth
3

In diesem Beispiel erhalten Sie eine aktive Vorschau mit einer Start / Stopp-Schaltfläche für die Aufnahme. Es wurde von diesem Android- Blog modifiziert und scheint ziemlich zuverlässig zu sein.

Java-Klasse (VideoWithSurfaceVw)

package <<your packagename here>>;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;

public class VideoWithSurfaceVw extends Activity{

    // Adapted from http://sandyandroidtutorials.blogspot.co.uk/2013/05/android-video-capture-tutorial.html


    private Camera myCamera;
    private MyCameraSurfaceView myCameraSurfaceView;
    private MediaRecorder mediaRecorder;

    Button myButton;
    SurfaceHolder surfaceHolder;
    boolean recording;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        recording = false;

        setContentView(R.layout.activity_video_with_surface_vw);

        //Get Camera for preview
        myCamera = getCameraInstance();
        if(myCamera == null){
            Toast.makeText(VideoWithSurfaceVw.this,
                    "Fail to get Camera",
                    Toast.LENGTH_LONG).show();
        }

        myCameraSurfaceView = new MyCameraSurfaceView(this, myCamera);
        FrameLayout myCameraPreview = (FrameLayout)findViewById(R.id.videoview);
        myCameraPreview.addView(myCameraSurfaceView);

        myButton = (Button)findViewById(R.id.mybutton);
        myButton.setOnClickListener(myButtonOnClickListener);
    }

    Button.OnClickListener myButtonOnClickListener
            = new Button.OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            try{
                if(recording){
                    // stop recording and release camera
                    mediaRecorder.stop();  // stop the recording
                    releaseMediaRecorder(); // release the MediaRecorder object

                    //Exit after saved
                    //finish();
                    myButton.setText("REC");
                    recording = false;
                }else{

                    //Release Camera before MediaRecorder start
                    releaseCamera();

                    if(!prepareMediaRecorder()){
                        Toast.makeText(VideoWithSurfaceVw.this,
                                "Fail in prepareMediaRecorder()!\n - Ended -",
                                Toast.LENGTH_LONG).show();
                        finish();
                    }

                    mediaRecorder.start();
                    recording = true;
                    myButton.setText("STOP");
                }
            }catch (Exception ex){
                ex.printStackTrace();
            }
        }};

    private Camera getCameraInstance(){
        // TODO Auto-generated method stub
        Camera c = null;
        try {
            c = Camera.open(); // attempt to get a Camera instance
        }
        catch (Exception e){
            // Camera is not available (in use or does not exist)
        }
        return c; // returns null if camera is unavailable
    }

    private String getFileName_CustomFormat() {
        SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd HH_mm_ss");
        Date now = new Date();
        String strDate = sdfDate.format(now);
        return strDate;
    }


    private boolean prepareMediaRecorder(){
        myCamera = getCameraInstance();
        mediaRecorder = new MediaRecorder();

        myCamera.unlock();
        mediaRecorder.setCamera(myCamera);

        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

        mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));



        mediaRecorder.setOutputFile("/sdcard/" + getFileName_CustomFormat() + ".mp4");
        //mediaRecorder.setOutputFile("/sdcard/myvideo1.mp4");
        mediaRecorder.setMaxDuration(60000); // Set max duration 60 sec.
        mediaRecorder.setMaxFileSize(50000000); // Set max file size 50M

        mediaRecorder.setPreviewDisplay(myCameraSurfaceView.getHolder().getSurface());

        try {
            mediaRecorder.prepare();
        } catch (IllegalStateException e) {
            releaseMediaRecorder();
            return false;
        } catch (IOException e) {
            releaseMediaRecorder();
            return false;
        }
        return true;

    }

    @Override
    protected void onPause() {
        super.onPause();
        releaseMediaRecorder();       // if you are using MediaRecorder, release it first
        releaseCamera();              // release the camera immediately on pause event
    }

    private void releaseMediaRecorder(){
        if (mediaRecorder != null) {
            mediaRecorder.reset();   // clear recorder configuration
            mediaRecorder.release(); // release the recorder object
            mediaRecorder = new MediaRecorder();
            myCamera.lock();           // lock camera for later use
        }
    }

    private void releaseCamera(){
        if (myCamera != null){
            myCamera.release();        // release the camera for other applications
            myCamera = null;
        }
    }

    public class MyCameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback{

        private SurfaceHolder mHolder;
        private Camera mCamera;

        public MyCameraSurfaceView(Context context, Camera camera) {
            super(context);
            mCamera = camera;

            // Install a SurfaceHolder.Callback so we get notified when the
            // underlying surface is created and destroyed.
            mHolder = getHolder();
            mHolder.addCallback(this);
            // deprecated setting, but required on Android versions prior to 3.0
            mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int weight,
                                   int height) {
            // If your preview can change or rotate, take care of those events here.
            // Make sure to stop the preview before resizing or reformatting it.

            if (mHolder.getSurface() == null){
                // preview surface does not exist
                return;
            }

            // stop preview before making changes
            try {
                mCamera.stopPreview();
            } catch (Exception e){
                // ignore: tried to stop a non-existent preview
            }

            // make any resize, rotate or reformatting changes here

            // start preview with new settings
            try {
                mCamera.setPreviewDisplay(mHolder);
                mCamera.startPreview();

            } catch (Exception e){
            }
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            // The Surface has been created, now tell the camera where to draw the preview.
            try {
                mCamera.setPreviewDisplay(holder);
                mCamera.startPreview();
            } catch (IOException e) {
            }
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            // TODO Auto-generated method stub

        }
    }
}

Aktivität (activity_video_with_surface_vw)

<RelativeLayout android:id="@+id/surface_camera"     
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:layout_weight="1"
>

<RelativeLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <FrameLayout
        android:id="@+id/videoview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>
    <Button
        android:id="@+id/mybutton"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        android:text="REC"
        android:textSize="12dp"/>
</RelativeLayout>

</RelativeLayout>
HockeyJ
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Das Ausführen des Projekts in Android Studio erzeugt die folgende Fehlermeldung in der XML-Datei: Fehler: (29) Fehler beim Parsen von XML: Kein Element gefunden, wobei 29 die Zeile ist, die </ RelativeLayout> entspricht
bergercookie
@bergercookie - hast du das Problem gefunden / behoben? Ich habe dies aus meinem Arbeitscode entfernt (mit Android Studio). Fühlen Sie sich frei, meinen Beitrag zu bearbeiten, wenn es ein Problem gibt.
HockeyJ
1
@bergercookie - Dem XML-Beispiel fehlt nur ein schließendes RelativeLayout-Tag. Ich habe die Formatierung
korrigiert
1

Als Randnotiz - es scheint einen Fehler in der Android-API oder in der fehlerhaften Dokumentation zu geben, oder vielleicht bin ich einfach nur dumm. In den Google-Dokumenten ist Folgendes eindeutig angegeben:

Hinweis: Ab Android 4.0 (API-Level 14) werden die Aufrufe Camera.lock () und Camera.unlock () automatisch für Sie verwaltet.

Siehe: http://developer.android.com/guide/topics/media/camera.html

Dies scheint nicht der Fall zu sein!

Nachdem ich buchstäblich Tage ohne Erfolg gekämpft hatte und viele kleine Probleme wie "Fehler beim Starten" aufgetreten waren, entschied ich mich, die Sperre und die BAM manuell zu implementieren! alles hat gut funktioniert.

Ich benutze den Genymotion-Emulator für ein 4.1.1-Gerät mit einem Mindest-SDK von 14.

Chris
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1

Das obige Beispiel funktioniert, wenn Sie eine Rückfahrkamera verwenden. Wenn Sie eine Frontkamera verwenden, müssen Sie einige Dinge anpassen:

Zunächst müssen Sie dem Manifest eine neue Berechtigung hinzufügen.

<uses-feature android:name="android.hardware.camera.front" android:required="false" />

In Ihrer initRecorderMethode anstelle von

CamcorderProfile cpHigh = CamcorderProfile
                .get(CamcorderProfile.QUALITY_HIGH);
recorder.setProfile(cpHigh);

Sie müssen verwenden:

CamcorderProfile profile = CamcorderProfile.get(Camera.CameraInfo.CAMERA_FACING_FRONT, CamcorderProfile.QUALITY_LOW);
recorder.setProfile(profile);

da CamcorderProfile.QUALITY_HIGHist für die rückfahrkamera reserviert.

Sie müssen auch die Videogröße für den Mediarecorder so einstellen, wie sie in Ihrer Oberflächenansicht ist.

Hier ist das vollständige Beispiel für die Aufnahme von Videos von der Frontkamera mit einer kleinen Vorschau:

Android.manifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" android:required="false" />
<uses-feature android:name="android.hardware.camera.front" android:required="false" />

activity_camera.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="CameraActivity">

    <SurfaceView
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:id="@+id/surfaceView"/>

    <Button
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:text="REC"
        android:id="@+id/btnRecord"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="25dp" />
</RelativeLayout>

CameraActivity.java

public class SongVideoActivity extends BaseActivity implements SurfaceHolder.Callback {

    private int mCameraContainerWidth = 0;
    private SurfaceView mSurfaceView = null;
    private SurfaceHolder mSurfaceHolder = null;

    private Camera mCamera = null;
    private boolean mIsRecording = false;

    private int mPreviewHeight;
    private int mPreviewWidth;

    MediaRecorder mRecorder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_song_video);

        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(Thread thread, Throwable ex) {
                releaseMediaRecorder();
                releaseCamera();
            }
        });

        mCamera = getCamera();

        //camera preview
        mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.addCallback(this);
        // deprecated setting, but required on Android versions prior to 3.0
        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        mCameraContainerWidth = mSurfaceView.getLayoutParams().width;

        findViewById(R.id.btnRecord).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mIsRecording) {
                    stopRecording();
                } else {
                    // initialize video camera
                    if (prepareVideoRecorder()) {

                        // Camera is available and unlocked, MediaRecorder is prepared,
                        // now you can start recording
                        mRecorder.start();

                        // inform the user that recording has started
                        Toast.makeText(getApplicationContext(), "Started recording", Toast.LENGTH_SHORT).show();
                        mIsRecording = true;
                    } else {
                        // prepare didn't work, release the camera
                        releaseMediaRecorder();
                        // inform user
                    }
                }
            }
        });
    }

    private void stopRecording() {
        mRecorder.stop();  // stop the recording
        releaseMediaRecorder(); // release the MediaRecorder object
        mCamera.lock();         // take camera access back from MediaRecorder

        // inform the user that recording has stopped
        Toast.makeText(this, "Recording complete", Toast.LENGTH_SHORT).show();
        mIsRecording = false;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        releaseMediaRecorder();       // if you are using MediaRecorder, release it first
        releaseCamera();              // release the camera immediately on pause event
    }

    private Camera getCamera() {

        Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
        for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); camIdx++) {
            Camera.getCameraInfo(camIdx, cameraInfo);
            if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                try {
                    return mCamera = Camera.open(camIdx);
                } catch (RuntimeException e) {
                    Log.e("cameras", "Camera failed to open: " + e.getLocalizedMessage());
                }
            }
        }
        return null;
    }

    @Override
    protected void onPause() {
        super.onPause();
        releaseMediaRecorder();       // if you are using MediaRecorder, release it first
        releaseCamera();              // release the camera immediately on pause event
    }

    private Camera.Size getBestPreviewSize(Camera.Parameters parameters) {
        Camera.Size result=null;

        for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
            if(size.width < size.height) continue; //we are only interested in landscape variants

            if (result == null) {
                result = size;
            }
            else {
                int resultArea = result.width*result.height;
                int newArea = size.width*size.height;

                if (newArea > resultArea) {
                    result = size;
                }
            }
        }

        return(result);
    }

    private boolean prepareVideoRecorder(){
        mRecorder = new MediaRecorder();

        // Step 1: Unlock and set camera to MediaRecorder
        mCamera.unlock();
        mRecorder.setCamera(mCamera);

        // Step 2: Set sources
        mRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        mRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        //recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

        // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
        // Customise your profile based on a pre-existing profile
        CamcorderProfile profile = CamcorderProfile.get(Camera.CameraInfo.CAMERA_FACING_FRONT, CamcorderProfile.QUALITY_LOW);
        mRecorder.setProfile(profile);

        // Step 4: Set output file
        mRecorder.setOutputFile(new File(getFilesDir(), "movie-" + UUID.randomUUID().toString()).getAbsolutePath());
        //recorder.setMaxDuration(50000); // 50 seconds
        //recorder.setMaxFileSize(500000000); // Approximately 500 megabytes

        mRecorder.setVideoSize(mPreviewWidth, mPreviewHeight);

        // Step 5: Set the preview output
        mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());

        // Step 6: Prepare configured MediaRecorder
        try {
            mRecorder.prepare();
        } catch (IllegalStateException e) {
            Toast.makeText(getApplicationContext(), "exception: " + e.getMessage(), Toast.LENGTH_LONG).show();
            releaseMediaRecorder();
            return false;
        } catch (IOException e) {
            Toast.makeText(getApplicationContext(), "exception: " + e.getMessage(), Toast.LENGTH_LONG).show();
            releaseMediaRecorder();
            return false;
        }
        return true;
    }

    private void releaseMediaRecorder(){
        if (mRecorder != null) {
            mRecorder.reset();   // clear recorder configuration
            mRecorder.release(); // release the recorder object
            mRecorder = null;
            mCamera.lock();           // lock camera for later use
        }
    }

    private void releaseCamera(){
        if (mCamera != null){
            mCamera.release();        // release the camera for other applications
            mCamera = null;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, now tell the camera where to draw the preview.
            Camera.Parameters parameters = mCamera.getParameters();
            parameters.setRecordingHint(true);
            Camera.Size size = getBestPreviewSize(parameters);
        mCamera.setParameters(parameters);

            //resize the view to the specified surface view width in layout
            int newHeight = size.height / (size.width / mCameraContainerWidth);
            mSurfaceView.getLayoutParams().height = newHeight;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        mPreviewHeight = mCamera.getParameters().getPreviewSize().height;
        mPreviewWidth = mCamera.getParameters().getPreviewSize().width;

        mCamera.stopPreview();
        try {
            mCamera.setPreviewDisplay(mSurfaceHolder);
        } catch (IOException e) {
            e.printStackTrace();
        }
        mCamera.startPreview();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        if (mIsRecording) {
            stopRecording();
        }

        releaseMediaRecorder();
        releaseCamera();
    }
}
Davor Zlotrg
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Das funktioniert nicht. Meine App stürzt ab, indem die VM heruntergefahren wird.
Pink Jazz
Funktioniert! Das aufgenommene Video steht jedoch auf dem Kopf. Auch wenn ich versuche, match_parent auf width zu machen, ist die Vorschau nicht sichtbar. : /
M. Usman Khan
Für die Vollbildvorschau legen Sie Breite und Höhe als wrap_content fest.
M. Usman Khan
Wie kann ich die PORTRAIT-Variante einstellen?
Rozina
1

Ab Dezember 2017 gab es einige Aktualisierungen, z. B. ist die Verwendung von android.hardware.Camerajetzt veraltet. Während das neuere android.hardware.camera2mit praktischen Dingen wie einem kommt CameraManager.

Ich persönlich mag dieses Beispiel sehr, das diese aktuelle API nutzt und wie ein Zauber wirkt: https://github.com/googlesamples/android-Camera2Video

Dazu gehört auch, dass der Benutzer beim Start nach den erforderlichen Berechtigungen gefragt wird, und dass vor dem Starten der Videoaufzeichnung eine Videovorschau angezeigt wird.

(Außerdem finde ich den Code wirklich schön (und das ist sehr selten für mich ^^), aber das ist nur meine subjektive Meinung.)

jakob.j
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funktioniert nicht für Samsung J2 :( Die resultierende Videodatei kann nicht abgespielt werden
Sam Sch
0

Anstatt Code aus der Skizze zu schreiben, können Sie eine Bibliothek auf GitHub verwenden. Zum Beispiel: https://github.com/CameraKit/camerakit-android (oder https://github.com/google/cameraview oder https://github.com/hujiaweibujidao/CameraView usw.). Dann brauchen Sie nur noch:

private CameraKitView cameraKitView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    cameraKitView = findViewById(R.id.camera);
}

@Override
protected void onStart() {
    super.onStart();
    cameraKitView.onStart();
}

@Override
protected void onResume() {
    super.onResume();
    cameraKitView.onResume();
}

@Override
protected void onPause() {
    cameraKitView.onPause();
    super.onPause();
}

@Override
protected void onStop() {
    cameraKitView.onStop();
    super.onStop();
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    cameraKitView.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
ch271828n
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