android - Camera onPictureTaken() 有时不被调用

Question

我有一个发布到 Google Play 的应用程序，它有时会使用来自后台服务的前置摄像头拍照。现在，我收到用户的投诉，说应用程序的这个特定部分不是很一致，我知道这是真的，因为它通常在我调用 camera.takePicture() 后停止。 . - 即 PictureCallback不被调用。

关于此问题，SO 上还有其他几个问题，here和 here ，我已经浏览了所有这些，他们的修复对我没有任何帮助。我的情况与其他人不同，因为在我的应用程序中，通常会调用 onPictureTaken，但有时会失败(大约 1/10)。

我在这个问题上摸索了 2 天，没有任何进展。

除其他事项外，我还尝试注释掉我在 PictureCapllback 中启动的线程，这似乎使它更加一致，但并不完全一致，因此它可能是某种内存问题。

    ...
    // Take photo
    takePhoto(new MyPictureCallback());
}

private class MyPictureCallback implements Camera.PictureCallback{
    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        Log.d(Constants.TAG_ALERT_PROCESS, "onPictureTaken() called");

        // Release camera
        cameraHandler.release();

        // Continue process
        new Thread(new GotPictureRunnable(data)).start();
    }
}

public void takePhoto(Camera.PictureCallback callback) {

    // Create new cameraInfo object
    cameraInfo = new Camera.CameraInfo();

    // Get camera object
    camera = getCamera();

    // If camera is null bail
    if(camera == null){
        return;
    }

    // Set camera options
    setCameraParameters();
    Log.v(Constants.TAG_ALERT_PROCESS, "Camera parameters set");

    try{
        camera.setPreviewTexture(new SurfaceTexture(0)); // Hack for no preview
        Log.v(Constants.TAG_ALERT_PROCESS, "Preview set");
    } catch (Exception e){
        Log.v(Constants.TAG_ALERT_PROCESS, "Failed to set Preview Texture at camera.takePicture()");
        e.printStackTrace();
        return;
    }

    // Start the preview
    camera.startPreview();
    Log.v(Constants.TAG_ALERT_PROCESS, "Preview started");

    // Preview needs time to start
    Utilities.sleepThread(1000);
    Log.v(Constants.TAG_ALERT_PROCESS, "Thread slept for 1000ms");

    // Take picture and pass our callback
    Log.v(Constants.TAG_ALERT_PROCESS, "Calling takePicture()");
    camera.takePicture(null, null, callback);
}

private void setCameraParameters() {

    // Create parameters object
    Camera.Parameters params = this.camera.getParameters();

    // Set picture size
    setPictureSize(params, context);

    // Set jpeg quality
    params.setJpegQuality(getPictureQuality());

    // Set orientation
    params.setRotation(getRotation());

    // Set Parameters
    this.camera.setParameters(params);
}

public void release(){
    if(camera != null){
        camera.release();
        camera = null;
    }
}

登录失败

07-06 18:09:38.134     135-1051/? I/CameraClient﹕ Opening camera 1
07-06 18:09:38.134     135-1051/? I/CameraHAL﹕ camera_device open
07-06 18:09:38.149  16009-19806/com...V/myTag﹕ Got front Camera
07-06 18:09:38.157  16009-19806/com...V/myTag﹕ Set camera parameters
07-06 18:09:38.157  16009-19806/com...V/myTag﹕ Preview set
07-06 18:09:38.540  16009-19806/com...V/myTag﹕ Preview started
07-06 18:09:38.548    135-19815/? D/﹕ PPM: Standby to first shot: Sensor Change completed -  :390.137 ms :  1404662978557 ms
07-06 18:09:39.540  16009-19806/com...V/myTag﹕ Thread slept for 1000ms
07-06 18:09:39.540  16009-19806/com...V/myTag﹕ Calling takePicture()
07-06 18:09:39.774    135-19815/? D/﹕ PPM: Shot to snapshot:  :228.852 ms :  1404662979777 ms
07-06 18:09:39.813    135-19815/? D/﹕ PPM: Shot to Jpeg:  :274.231 ms :  1404662979823 ms
07-06 18:09:39.931      135-135/? E/CameraHAL﹕ Adapter state switch PREVIEW_ACTIVE Invalid Op! event = 0x5
07-06 18:09:40.173      135-135/? I/CameraClient﹕ Destroying camera 1

登录成功

07-06 18:13:21.868      135-502/? I/CameraClient﹕ Opening camera 1
07-06 18:13:21.868      135-502/? I/CameraHAL﹕ camera_device open
07-06 18:13:22.048  16009-19890/com...V/myTag﹕ Got front Camera
07-06 18:13:22.056  16009-19890/com...V/myTag﹕ rotation value = Automatic
07-06 18:13:22.063  16009-19890/com...V/myTag﹕ Set camera parameters
07-06 18:13:22.063  16009-19890/com...V/myTag﹕ Preview set
07-06 18:13:22.517  16009-19890/com...V/myTag﹕ Preview started
07-06 18:13:22.524    135-19893/? D/﹕ PPM: Standby to first shot: Sensor Change completed -  :460.845 ms :  1404663202530 ms
07-06 18:13:23.517  16009-19890/com...V/myTag﹕ Thread slept for 1000ms
07-06 18:13:23.517  16009-19890/com...V/myTag﹕ Calling takePicture()
07-06 18:13:23.727    135-19893/? D/﹕ PPM: Shot to snapshot:  :216.3 ms :  1404663203736 ms
07-06 18:13:23.774    135-19893/? D/﹕ PPM: Shot to Jpeg:  :261.688 ms :  1404663203781 ms
07-06 18:13:23.837  16009-16009/com...D/myTag﹕ onPictureTaken() called // <-- This line is only diff from failure log
07-06 18:13:23.837      135-135/? E/CameraHAL﹕ Adapter state switch PREVIEW_ACTIVE Invalid Op! event = 0x5
07-06 18:13:24.001      135-135/? I/CameraClient﹕ Destroying camera 1

Answer 1

你用过表面支架吗？从 kitkat 开始，这是必要的，而不是一种选择。

也尝试将回调作为 Activity 的实例变量。

另请查看我遇到的类似问题，我可以使用我在此处提出的第一个解决方案来解决该问题。 Camera API not working on KITKAT