Android : Method onPictureTaken never called, 即使使用 AsyncTask

Question

我要 随着 Activity “GameActivity” 拍照 将图片保存在 SD 卡上 将图片用于其他 Activity

问题是，当我只是保存图片而不对其进行任何操作时，图片已保存。当我在 camera.takePicture 之后启动 Activity (方法 startActivity)时，永远不会调用 onPictureTaken 方法。

我读到它是因为方法 takePicture 执行时间很长，所以我遵循了本网站 (http://www.workreloaded.com/2011/06/how-to-use-the-android-camera/) 上的建议并创建了一个扩展 AsyncTask 的类

public class PhotoTask extends AsyncTask<Boolean, Void, Void> {
public PhotoTask(Camera camera, SurfaceView surfaceCamera,boolean isPreview, SurfaceHolder holder, GameActivity gameactivity) {
constructor
}

    @Override
protected Void doInBackground(Boolean... params) {
     camera.takePicture(null,null, myPictureCallback_JPG);
        Log.w("GAMEACTIVITY","TAKEPICTURE");
        return null;
}

    @Override
protected void onPostExecute(Void result) {
    Log.w("GAMEACTIVITY","INTENT");
     Intent intent = new Intent(gameactivity.getApplicationContext(),ShareActivity.class);
     // Sending the picture taken to ShareActivity
     intent.putExtra("PICTURE_TAKEN", output);
     gameactivity.startActivity(intent);
}


PictureCallback myPictureCallback_JPG = new PictureCallback(){

    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        Log.w("GAMEACTIVITY","FIRST");
            File imagesFolder = new File(Environment.getExternalStorageDirectory(), "/KersplattFolder");
            imagesFolder.mkdirs(); 
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
            String date = dateFormat.format(new Date());
            String fileName = "Kersplatt_" + date + ".jpg";
            output = new File(imagesFolder, fileName);
            try {
                FileOutputStream fos = new FileOutputStream(output);
                fos.write(data);
                fos.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            camera.startPreview();
            }
};

在 GameActivity 中我有

PhotoTask photoTask = new PhotoTask(camera,surfaceCamera,isPreview,holder,GameActivity.this);
photoTask.execute(null);

触摸屏幕(拍照)

为什么我的方法 onPictureTaken 没有被调用？ (当我删除 onPostExecute 方法时调用)

Answer 1

我会推荐

 Intent intent = new Intent(gameactivity.getApplicationContext(),ShareActivity.class);
 // Sending the picture taken to ShareActivity
 intent.putExtra("PICTURE_TAKEN", output);
 gameactivity.startActivity(intent);

到 PictureCallback 而不是 onPostExecute

当你完成存储图像然后移动到下一个 Activity