Android正確關閉相機

Question

好吧，在過去幾周裏我發生了幾次這樣的事情，我無法弄清楚如何解決這個問題。基本上我的應用程序使用相機，但經常會在應用程序中使用相機之後經常關閉，即使使用其他應用程序或手機上的默認相機也無法使用。

我發現解決這個問題的唯一方法就是重新啓動手機。

從我至今讀我明白我需要調用

camera.release();

camera = null;

但我仍然得到力的誤差接近有時候，有可能是有人剛取看看通過也許我錯過了camera.release();某處。

public class AndroidCamera extends Activity implements SurfaceHolder.Callback{ 

Camera camera; 
SurfaceView surfaceView; 
SurfaceHolder surfaceHolder; 
boolean previewing = false; 
LayoutInflater controlInflater = null; 

final int RESULT_SAVEIMAGE = 0; 

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



    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 

    getWindow().setFormat(PixelFormat.UNKNOWN); 
    surfaceView = (SurfaceView)findViewById(R.id.camerapreview); 
    surfaceHolder = surfaceView.getHolder(); 
    surfaceHolder.addCallback(this); 
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 

    controlInflater = LayoutInflater.from(getBaseContext()); 
    View viewControl = controlInflater.inflate(R.layout.control, null); 
    LayoutParams layoutParamsControl 
     = new LayoutParams(LayoutParams.FILL_PARENT, 
     LayoutParams.FILL_PARENT); 
    this.addContentView(viewControl, layoutParamsControl); 

    Button buttonTakePicture = (Button)findViewById(R.id.takepicture); 
    buttonTakePicture.setOnClickListener(new Button.OnClickListener(){ 

     public void onClick(View arg0) { 
      // TODO Auto-generated method stub 
      camera.takePicture(myShutterCallback, 
        myPictureCallback_RAW, myPictureCallback_JPG); 


     }}); 

} 

ShutterCallback myShutterCallback = new ShutterCallback(){ 

    public void onShutter() { 
     // TODO Auto-generated method stub 

    }}; 

PictureCallback myPictureCallback_RAW = new PictureCallback(){ 

    public void onPictureTaken(byte[] arg0, Camera arg1) { 
     // TODO Auto-generated method stub 

    }}; 

PictureCallback myPictureCallback_JPG = new PictureCallback(){ 

    public void onPictureTaken(byte[] arg0, Camera arg1) { 
     // TODO Auto-generated method stub 
     /*Bitmap bitmapPicture 
      = BitmapFactory.decodeByteArray(arg0, 0, arg0.length); */ 
     int imageNum = 0; 
     Intent imageIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
     File imagesFolder = new File(Environment.getExternalStorageDirectory(), "Punch"); 
     imagesFolder.mkdirs(); // <---- 
     String fileName = "image_" + String.valueOf(imageNum) + ".jpg"; 
     File output = new File(imagesFolder, fileName); 
     while (output.exists()){ 
      imageNum++; 
      fileName = "image_" + String.valueOf(imageNum) + ".jpg"; 
      output = new File(imagesFolder, fileName); 
     } 

     Uri uriSavedImage = Uri.fromFile(output); 
     imageIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage); 


     OutputStream imageFileOS; 
     try { 
      imageFileOS = getContentResolver().openOutputStream(uriSavedImage); 
      imageFileOS.write(arg0); 
      imageFileOS.flush(); 
      imageFileOS.close(); 

      Toast.makeText(AndroidCamera.this, 
        "Image saved", 
        Toast.LENGTH_LONG).show(); 

     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     Intent intent = new Intent(getBaseContext(), Punch.class); 
     intent.putExtra("filepath",uriSavedImage.toString()); 
     //just using a request code of zero 
     int request=0; 
     startActivityForResult(intent,request); 
    }}; 

public void surfaceChanged(SurfaceHolder holder, int format, int width, 
     int height) { 
    // TODO Auto-generated method stub 
    if(previewing){ 
     camera.stopPreview(); 
     previewing = false; 
    } 

    if (camera != null){ 
     try { 
      camera.setPreviewDisplay(surfaceHolder); 
      camera.startPreview(); 
      previewing = true; 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      camera.release(); 
      e.printStackTrace(); 
     } 
    } 
} 

public void surfaceCreated(SurfaceHolder holder) { 
    // TODO Auto-generated method stub 

    camera = Camera.open(); 
    try { 
      Camera.Parameters parameters = camera.getParameters(); 
      if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) { 
       // This is an undocumented although widely known feature 
       parameters.set("orientation", "portrait"); 
       // For Android 2.2 and above 
       camera.setDisplayOrientation(90); 
       // Uncomment for Android 2.0 and above 
       parameters.setRotation(90); 
      } else { 
       // This is an undocumented although widely known feature 
       parameters.set("orientation", "landscape"); 
       // For Android 2.2 and above 
       camera.setDisplayOrientation(0); 
       // Uncomment for Android 2.0 and above 
       parameters.setRotation(0); 
      } 
      camera.setParameters(parameters); 
      camera.setPreviewDisplay(holder); 
     } catch (IOException exception) { 
     camera.release(); 


     } 
     camera.startPreview(); 

    } 


public void surfaceDestroyed(SurfaceHolder holder) { 
    // TODO Auto-generated method stub 
    if(previewing && camera != null) { 
     if(camera!=null) { 
      camera.stopPreview(); 
      camera.release(); 
      camera = null; 
     } 
     previewing = false; 
    } 
} 
} 

的logcat的給我（還有更多，但我認爲它的，因爲相機隊我關閉，因此該應用的其餘部分不運行。

01-03 14:59:17.835: D/AndroidRuntime(16531): Shutting down VM

01-03 14:59:17.835: W/dalvikvm(16531): threadid=1: thread exiting with uncaught exception (group=0x4001d5a0)

01-03 14:59:17.845: E/AndroidRuntime(16531): FATAL EXCEPTION: main

01-03 14:59:17.845: E/AndroidRuntime(16531): java.lang.RuntimeException: Fail to connect to camera service

Answer 1

我解決了同樣的問題在的onPause關閉相機（）事件

@Override 
protected void onPause() 
{ 
    super.onPause(); 
    if (camera != null) { 
     camera.stopPreview(); 
     camera.release(); 
     camera = null; 
    } 
}