実行時例外カメラに接続できません一部のデバイスのサービス

Question

私のアプリケーションでバーコードスキャナを使用しています。一部のモバイルでは、カメラに接続できないという実行時例外が発生します。ここで

私はいくつかのデバイスでは、それが働いたが、一部にされているので、私は取得しています実行時例外がこの問題についてすべてのヘルプ

java.lang.RuntimeException: Fail to connect to camera service 
at android.hardware.Camera.<init>(Camera.java:532) 
at android.hardware.Camera.open(Camera.java:360) 

あるカメラ

/** 
* Opens the camera and applies the user settings. 
* 
* @throws RuntimeException if the method fails 
*/ 
@SuppressLint("InlinedApi") 
private Camera createCamera() { 
    int requestedCameraId = getIdForRequestedCamera(mFacing); 
    if (requestedCameraId == -1) { 
     throw new RuntimeException("Could not find requested camera."); 
    } 
    Camera camera = Camera.open(requestedCameraId); 

    SizePair sizePair = selectSizePair(camera, mRequestedPreviewWidth, mRequestedPreviewHeight); 
    if (sizePair == null) { 
     throw new RuntimeException("Could not find suitable preview size."); 
    } 
    Size pictureSize = sizePair.pictureSize(); 
    mPreviewSize = sizePair.previewSize(); 

    int[] previewFpsRange = selectPreviewFpsRange(camera, mRequestedFps); 
    if (previewFpsRange == null) { 
     throw new RuntimeException("Could not find suitable preview frames per second range."); 
    } 

    Camera.Parameters parameters = camera.getParameters(); 

    if (pictureSize != null) { 
     parameters.setPictureSize(pictureSize.getWidth(), pictureSize.getHeight()); 
    } 

    parameters.setPreviewSize(mPreviewSize.getWidth(), mPreviewSize.getHeight()); 
    parameters.setPreviewFpsRange(
      previewFpsRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX], 
      previewFpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]); 
    parameters.setPreviewFormat(ImageFormat.NV21); 

    setRotation(camera, parameters, requestedCameraId); 

    if (mFocusMode != null) { 
     if (parameters.getSupportedFocusModes().contains(
       mFocusMode)) { 
      parameters.setFocusMode(mFocusMode); 
     } else { 
      Log.i(TAG, "Camera focus mode: " + mFocusMode + " is not supported on this device."); 
     } 
    } 

    // setting mFocusMode to the one set in the params 
    mFocusMode = parameters.getFocusMode(); 

    if (mFlashMode != null) { 
     if (parameters.getSupportedFlashModes() != null) { 
      if (parameters.getSupportedFlashModes().contains(
        mFlashMode)) { 
       parameters.setFlashMode(mFlashMode); 
      } else { 
       Log.i(TAG, "Camera flash mode: " + mFlashMode + " is not supported on this device."); 
      } 
     } 
    } 

    // setting mFlashMode to the one set in the params 
    mFlashMode = parameters.getFlashMode(); 

    camera.setParameters(parameters); 

    // Four frame buffers are needed for working with the camera: 
    // 
    // one for the frame that is currently being executed upon in doing detection 
    // one for the next pending frame to process immediately upon completing detection 
    // two for the frames that the camera uses to populate future preview images 
    camera.setPreviewCallbackWithBuffer(new CameraPreviewCallback()); 
    camera.addCallbackBuffer(createPreviewBuffer(mPreviewSize)); 
    camera.addCallbackBuffer(createPreviewBuffer(mPreviewSize)); 
    camera.addCallbackBuffer(createPreviewBuffer(mPreviewSize)); 
    camera.addCallbackBuffer(createPreviewBuffer(mPreviewSize)); 

    return camera; 
} 

    * Stops the camera. 
*/ 
@Override 
protected void onPause() { 
    super.onPause(); 
    if (mPreview != null) { 
     mPreview.stop(); 
    } 
} 

/** 
* Releases the resources associated with the camera source, the associated detectors, and the 
* rest of the processing pipeline. 
*/ 
@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    if (mPreview != null) { 
     mPreview.release(); 
    } 

} 

    /** 
* Restarts the camera. 
*/ 
@Override 
protected void onResume() { 
    super.onResume(); 
     startCameraSource(); 
} 

のために使用していたコードですそれは私が問題を得ることができない働いていません。

Answer 1

アクセスする前に必ずカメラが使用可能かどうかを確認してください。

private Camera mCamera;  
    /** 
    * Opens the camera and applies the user settings. 
    * 
    * @throws RuntimeException if the method fails 
    */ 
    @SuppressLint("InlinedApi") 
    private Camera createCamera() { 
     int requestedCameraId = getIdForRequestedCamera(mFacing); 
     if (requestedCameraId == -1) { 
      throw new RuntimeException("Could not find requested camera."); 
     } 

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

     mCamera= Camera.open(requestedCameraId); 

     if(camera == null){ 
      Toast.makeText(mContext, "Camera service is not available currently.", Toast.LENGTH_LONG.show())  
      } 
      //.... 
     } 
    } 

onDestroy()の前にカメラを配置してください。

/** 
* Releases the resources associated with the camera source, the associated detectors, and the 
* rest of the processing pipeline. 
*/ 
@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    if (mPreview != null) { 
     mPreview.release(); 
     mCamera.release(); 
     mCamera = null; 
}