surfaceview over camera surfaceview onresume後不可見

Question

在我的相機應用程序中，我有兩個曲面視圖，一個用於預覽相機，一個繪製稱爲tFrame的形狀（其類型是擴展surfaceView的TargetTarget）。 在開始它正常工作，但在應用程序不可見時onResume後，tFrame surfaceview不可見，我只查看預覽相機的人。

這裏是我的代碼

public class CameraActivity extends Activity { 

private Camera mCamera; 
private CameraPreview mPreview; 
public Target_Frame tFrame; 
private ColorView cViewActual; 
private ColorView bestMatchCView; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    Log.d("Function", "onCreate iniciado"); 
    setContentView(R.layout.camera_layout); 



    tFrame=new Target_Frame(this); 
    cViewActual=(ColorView)findViewById(R.id.colorViewActual); 
    bestMatchCView=(ColorView)findViewById(R.id.colorViewBestMatch); 



    mCamera=getCameraInstance(); 
    mPreview=new CameraPreview(this, mCamera,cViewActual,bestMatchCView,tFrame,colorNametextView); 





    FrameLayout preview=(FrameLayout)findViewById(R.id.camera_preview); 

    LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); 
    params.gravity=Gravity.CENTER; 

    tFrame.setLayoutParams(params); 
    preview.addView(tFrame);//the first to put is the one on the bottom of the view 
    preview.addView(mPreview); 



} 




/** Check if this device has a camera only if not specified in the manifest */ 
public boolean checkCameraHardware(Context context) { 
    Log.d("Function", "checkCameraHardware iniciado"); 
    if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ 
     // this device has a camera 
     return true; 
    } else { 
     // no camera on this device 
     return false; 
    } 
} 

/** A safe way to get an instance of the Camera object. */ 
public static Camera getCameraInstance(){ 
    Log.d("Function", "getCameraInstance iniciado"); 
    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 
} 




/**Check if the device has flash*/ 
public boolean checkFlash(Context context){ 
    Log.d("Function", "checkFlash iniciado"); 
    if(context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)){ 
     //the device has flash 
     return true; 
    }else{ 
     //no flash 
     return false; 
    } 

} 




@Override 
protected void onDestroy() { 
    // TODO Auto-generated method stub 
    super.onDestroy(); 
    Log.d("Function", "onDestroy CameraActivity iniciado"); 
    releaseCamera(); 
} 




@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 
    Log.d("Function", "onPause CameraActivity iniciado"); 
    releaseCamera(); 
} 




@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 
    Log.d("Function", "onResume CameraActivity iniciado"); 
    //Test if i have to put all this code like in onCreate 
    if(mCamera!=null){ 
     return; 
    } 
    mCamera=getCameraInstance(); 

    //if(mPreview!=null){ 
    // return; 
    //} 

    mPreview=new CameraPreview(this, mCamera,cViewActual,bestMatchCView,tFrame,colorNametextView); 
    FrameLayout preview=(FrameLayout)findViewById(R.id.camera_preview); 
    preview.addView(mPreview); 




} 


private void releaseCamera(){ 
    Log.d("Function", "releaseCamera iniciado"); 
    if (mCamera != null){ 
     mCamera.setPreviewCallback(null); 
     mCamera.release();  // release the camera for other applications 
     mCamera = null; 
    } 
} 

}

Answer 1

最後我deleteed第二面的觀點，因爲我的Adroid文檔中讀取surfaceviews都沒有作出與另一surfaceview使用