使用 framelayout 和 surfaceview 的相机记录

Question

尝试在没有 android 的默认摄像头的情况下录制视频。我找到了一些示例代码来修复我的解决方案。现在在框架布局中的相机预览方向有点奇怪。当我以纵向开始录制时，预览是横向的，反之亦然。

我尝试为表面视图和框架布局设置旋转。然后我尝试设置方向，但没有任何效果。

我的应用是将前置摄像头录制的视频保存到sd卡上。除方向问题外，一切正常。

我的代码如下，

     Layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<RelativeLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <FrameLayout
        android:id="@+id/videoview" 
        android:layout_width="200dp"
        android:layout_height="200dp"/>
    <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>

 Java File:

  public class RecordVideo extends Activity{

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);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR | ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    recording = false;

    setContentView(R.layout.main);

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

    myCameraSurfaceView = new MyCameraSurfaceView(this, myCamera);
    //myCameraSurfaceView.setO
    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
        if(recording){
            // stop recording and release camera
            mediaRecorder.stop();  // stop the recording
            releaseMediaRecorder(); // release the MediaRecorder object

            //Exit after saved
            finish();
        }else{

            //Release Camera before MediaRecorder start
            releaseCamera();

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

            mediaRecorder.start();
            recording = true;
            myButton.setText("STOP");
        }
    }};

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 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/myvideo.mp4");
    mediaRecorder.setMaxDuration(60000); // Set max duration 60 sec.
    mediaRecorder.setMaxFileSize(5000000); // Set max file size 5M

    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 = null;
        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

    }
}
}

Answer 1

这应该可以解决您的问题：

    private static void setCameraDisplayOrientation(Context mContext, android.hardware.Camera.CameraInfo info) {
    int rotation = ((MainActivity) mContext).getWindowManager().getDefaultDisplay()
            .getRotation();
    int degrees = 0;
    switch (rotation) {
        case Surface.ROTATION_0:
            degrees = 0;
            break;
        case Surface.ROTATION_90:
            degrees = 90;
            break;
        case Surface.ROTATION_180:
            degrees = 180;
            break;
        case Surface.ROTATION_270:
            degrees = 270;
            break;
    }

    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        previewRotation = (info.orientation + degrees) % 360;
        previewRotation = (360 - previewRotation) % 360;  // compensate the mirror
    } else {  // back-facing
        previewRotation = (info.orientation - degrees + 360) % 360;
    }
    mCameraInstance.setDisplayOrientation(previewRotation);
}

使用 framelayout 和 surfaceview 的相机记录

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