在Android上使用摄像头API时出现问题

我正在尝试使用android摄像头API。视频预览效果很好。我有一个用于拍照的按钮实例，然后将其存储在SD卡上。有时候它工作得很好，有时候不行：只需按下按钮，视频预览就会冻结，然后什么也不会发生，只需在我得到弹出窗口“应用程序不回复等”后。当这种情况发生时（大约3日1次），我在logcat中没有错误消息。之后，我必须重新启动我的手机，因为相机不再可用。这是我的密码：

  public class Test_cam extends Activity implements PictureCallback,ShutterCallback,OnClickListener{
     private static final String TAG = "CameraDemo";
      Test_cam_preview preview; //  This object will create the Camera object and return it to the CameraDemo activity. 
      Button buttonClick; 
      public boolean onProgress = false;

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

        preview = new Test_cam_preview(this); 
        ((FrameLayout) findViewById(R.id.preview)).addView(preview); 

        buttonClick = (Button) findViewById(R.id.buttonClick);
        buttonClick.setOnClickListener(this);      
        Log.d(TAG, "onCreate'd");
      }

      public void launch_scanpic(){
              Intent intent = new Intent(Test_cam.this,Test_cam_scanpic.class);
              startActivity(intent);
      }



            @Override
            public void onClick(View v) { 
                     if(!onProgress)
                     {
                            onProgress = true;
                    preview.camera.takePicture(Test_cam.this, null, Test_cam.this); //bien mettre null car raw callback renvoit tjrs null!
                    //on lance scanclothe activity
                     }
     }


      @Override
  public void onShutter() {
          Log.d(getClass().getSimpleName(), "get pic...");               
  }



      @Override
  public void onPictureTaken(byte[] data, Camera camera) {

          FileOutputStream outStream = null;
          try {
            if (data==null)
            {
                    Log.e(TAG,"data is null !!!!!!!");
            }
            else
            {
                    // Write to SD Card
                    outStream = new FileOutputStream("/sdcard/test.jpg"); 
                    outStream.write(data);
                    Log.e(TAG, "onPictureTaken - wrote bytes: " + data.length);
                     outStream.close();
            }



          } catch (FileNotFoundException e) { 
              Log.e(getClass().getSimpleName(), "file not found",e);
            e.printStackTrace();
          } catch (IOException e) {
              Log.e(getClass().getSimpleName(), "Saving picture error",e);
            e.printStackTrace();
          } 

          Log.e(TAG, "onPictureTaken - jpeg");
          SystemClock.sleep(2000);
          onProgress=false;
          launch_scanpic();
      }

}

当应用程序运行时，我显然得到了正确的日志：

05-03 18:22:31.053: INFO/SecCamera(76): int android::SecCamera::endSnapshot() :
05-03 18:22:31.053: INFO/SecCamera(76): munmap():virt. addr 0x41ddb000 size = 4261248
05-03 18:22:31.061: DEBUG/dalvikvm(700): GC_FOR_MALLOC freed 506K, 57% free 2779K/6407K,   external 1625K/2137K, paused 15ms
05-03 18:22:31.061: INFO/dalvikvm-heap(700): Grow heap (frag case) to 7.734MB for   1114262-byte allocation
05-03 18:22:31.088: DEBUG/dalvikvm(700): GC_FOR_MALLOC freed 0K, 49% free 3867K/7559K, external 1625K/2137K, paused 13ms
05-03 18:22:31.127: DEBUG/dalvikvm(700): GC_CONCURRENT freed <1K, 49% free 3867K/7559K, external 1625K/2137K, paused 2ms+2ms
05-03 18:22:32.022: ERROR/CameraDemo(700): onPictureTaken - wrote bytes: 1114246
05-03 18:22:32.022: ERROR/CameraDemo(700): onPictureTaken - jpeg

提前谢谢

---

约翰

我和你的情况差不多

它在onPictureTaken中崩溃，因为拍摄照片的JNI线程尚未完成，并且libcamera/SecCameraHWInterface.cpp中的mCaptureInProgress变量尚未设置为false

要解决问题，您必须删除“SystemClock.sleep（2000）；”，而是向另一个线程发送延迟消息，该线程将在takePicture线程终止后启动您的Intent

---

我想这一定是Nexus相机本机代码中的一个bug，因为我在几部Android手机上试用了我的应用程序，除了Nexus S之外，它每次都运行良好：（

它在模拟器上也会以相同的频率冻结某些时间。

class Test_cam_preview extends SurfaceView implements SurfaceHolder.Callback{ 
  private static final String TAG = "Preview";
  SurfaceHolder mHolder; 
  public Camera camera; 

  Test_cam_preview(Context context){
    super(context);
    mHolder = getHolder(); 
    mHolder.addCallback(this);  
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);}

  public void surfaceCreated(SurfaceHolder holder){
    camera = Camera.open();
    Camera.Parameters params = camera.getParameters();
    params.setPictureFormat(PixelFormat.JPEG);
    params.set("flash-mode", "auto");
    camera.setParameters(params);     
    try {
      camera.setPreviewDisplay(holder);  

      camera.setPreviewCallback(new PreviewCallback(){ 
        public void onPreviewFrame(byte[] data, Camera camera){ 
          Test_cam_preview.this.invalidate();  
        }
      });
    } catch (IOException e) {
      e.printStackTrace();
      camera.release(); 
      camera = null;
    }}
  public void surfaceDestroyed(SurfaceHolder holder){
      if(camera != null){
          camera.stopPreview();
          camera.setPreviewCallback(null);
          camera.release(); //it is important that this is done so camera is     
          camera = null;
      }
  }
  public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    camera.startPreview();
  }}