Android Studio录制视频源码

以下是Android Studio录制视频的源码示例：

1. 在XML布局文件中添加一个SurfaceView和一个Button：

<SurfaceView
    android:id="@+id/surfaceView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<Button
    android:id="@+id/btnRecord"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Record" />

2. 在Activity中实现SurfaceHolder.Callback接口，并在onCreate()方法中设置SurfaceView的回调：

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {

    private Camera mCamera;
    private SurfaceView mSurfaceView;
    private SurfaceHolder mHolder;
    private boolean isRecording = false;
    private Button mBtnRecord;

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

        mSurfaceView = findViewById(R.id.surfaceView);
        mBtnRecord = findViewById(R.id.btnRecord);

        mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mCamera = Camera.open();
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        if (mHolder.getSurface() == null) {
            return;
        }
        try {
            mCamera.stopPreview();
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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

3. 在Button的点击事件中实现视频录制功能：

mBtnRecord.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (isRecording) {
            mCamera.stopPreview();
            mBtnRecord.setText("Record");
            isRecording = false;
        } else {
            mCamera.unlock();
            MediaRecorder recorder = new MediaRecorder();
            recorder.setCamera(mCamera);
            recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
            recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
            recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
            recorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
            recorder.setOutputFile(getOutputMediaFile().toString());
            recorder.setPreviewDisplay(mHolder.getSurface());
            try {
                recorder.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }
            recorder.start();
            mBtnRecord.setText("Stop");
            isRecording = true;
        }
    }
});

private static File getOutputMediaFile() {
    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_DCIM), "Camera");
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            return null;
        }
    }
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    return new File(mediaStorageDir.getPath() + File.separator +
            "VID_" + timeStamp + ".mp4");
}