安卓相機閃光燈不工作

Question

相機閃爍並消失，是否有任何兼容的措施？

Camera c = null; 
    try { 
     c = Camera.open(0); // attempt to get a Camera instance 
     Camera.Parameters p = c.getParameters(); 
     p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); 
     c.setParameters(p); 
     c.startPreview(); 

    } catch (Exception e) { 
     // Camera is not available (in use or does not exist) 
     Log.e(TAG,"exception e"+e.getMessage()); 
    } 

Answer 1

1，檢查是否允許使用閃爍的SurfaceView

 c = Camera.open(); 
    Camera.Parameters params=null; 
    params= c.getParameters(); 
    List<String> supportedFlashModes = sParams.getSupportedFlashModes(); 

       if (supportedFlashModes != null) { 

        if (supportedFlashModes.contains(Camera.Parameters.FLASH_MODE_TORCH)) { 
         sParams.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); 
        } else if (supportedFlashModes.contains(Camera.Parameters.FLASH_MODE_ON)) { 
         sParams.setFlashMode(Camera.Parameters.FLASH_MODE_ON); 
        } else c = null; 


       } else Log.d(TAG, "Camera is null."); 


       if (c != null) { 
        Log.d(TAG, "Flash disponibile (" + sParams.getFlashMode() + ")"); 
        c.setParameters(sParams); 

        c.autoFocus(null); 

       } 

2。有些特殊情況：

public void surfaceCreated(SurfaceHolder holder) { 

    if(mCamera!=null){ 
      mCamera.release(); 
     } 
     mCamera=Camera.open(); 

     mCamera.setParameters(PerviousParams); 
     mCamera.startPreview(); 
} 
    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { 

    if(mCamera!=null){ 
      mCamera.release(); 
     } 
     mCamera=Camera.open(); 

     mCamera.setParameters(PerviousParams); 
     mCamera.startPreview(); 
    }