如何在Android活动结束后发布相机?

时间:2013-05-23 04:04:46

标签: android android-camera

我正在开发一个需要扫描QR码并点击图片的应用程序,但有时会发生相机应用程序崩溃并且说Android相机已经停止工作并且设备需要重新启动才能正常运行的情况。

我希望能够从我的活动中释放相机,以避免在任何情况下都会崩溃。 需要帮助!

扫描代码:

 @Override
 public void onCreate(Bundle savedInstanceState)
   {
  super.onCreate(savedInstanceState);


       try{
       Intent intent = new Intent("com.google.zxing.client.android.SCAN");
          intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
          startActivityForResult(intent, 0);
       }
       catch(Exception e)
       {
         // ERROR
       }
    }

public void onActivityResult(int requestCode, int resultCode, Intent intent) 
   {
     if (requestCode == 0) 
      {
      if (resultCode == RESULT_OK)
     {
        String contents = intent.getStringExtra("SCAN_RESULT");
        showPass(contents);

     }
      else if (resultCode == RESULT_CANCELED) 
      {
          showFail();
      } 
      }
   }

点击图片的代码:

   public void takephoto(View v)
{

     Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
     startActivityForResult(cameraIntent, CAMERA_REQUEST);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    if (requestCode == CAMERA_REQUEST)
    {
              Bitmap photo = (Bitmap) data.getExtras().get("data");
               // some action.
    }
}

1 个答案:

答案 0 :(得分:17)

将以下代码放入您的onDestroy活动方法中:

protected void onDestroy(){

if(camera!=null){
            camera.stopPreview();
            camera.setPreviewCallback(null);

            camera.release();
            camera = null;
        }


}

如果您使用单独的Preview类,则在其中添加以下代码:

public void surfaceDestroyed(SurfaceHolder holder) {

        if(camera!=null){
            camera.stopPreview();
            camera.setPreviewCallback(null);

            camera.release();
            camera = null;
        }

    }