Android相机 - onPictureTaken未调用（使用GCM）

Question

我开始使用Google Cloud Messaging编写Android应用程序。当收到来自GCM的消息时，我想用前置摄像头拍摄照片。 我可以发送信息，接收信息并开始拍照。一切看起来都很好，但onPictureTaken（）从未调用过每次...... 只有当我设置一个断点时，它才能正常工作并制作图片并保存，当没有设置断点或者我没有使用调试器时，它不起作用..

它看起来像运行时问题..

我查看了解决方案，但我没有找到任何有用的信息..

请帮助我！

编辑： 当我在“活动创建”中执行“cam = Camera.open（CamID）”时，它会在意图服务中成功运行第一张照片...当我调用cam.takepicture（）时，它看起来没有正确初始化。 有人有想法吗？

 @Override
protected void onMessage(final Context context, Intent msg) 
{
    // Handle the message.
     final String message = msg.getStringExtra("message");

     Log.d(konstanten.DEBUG_PHOTO, "onMessage called:" + message);

     Handler h = new Handler(Looper.getMainLooper());
     h.post(new Runnable()
     {

          public void run() 
          {
              // TODO Auto-generated method stub
              Log.d(konstanten.DEBUG_PHOTO, "Handler started");
              Toast.makeText(context, message, Toast.LENGTH_LONG).show();
              TakePicture();
          }         
      });        
}

Camera camera;
int cameraId = 0;

public void TakePicture()
{


    try 
    {
        // do we have a camera?
        if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) 
        {
            Log.d(konstanten.DEBUG_PHOTO, "No Camera");
            Toast.makeText(this, "No camera on this device", Toast.LENGTH_LONG).show();
        } 
        else 
        {
            cameraId = findFrontFacingCamera();
            if (cameraId < 0) 
            {
                Log.d(konstanten.DEBUG_PHOTO, "No front camera found!");
                Toast.makeText(this, "No front facing camera found.", Toast.LENGTH_LONG).show();
            } 
            else 
            {
            try
                {

                    if (camera != null)
                    {
                        Log.d(konstanten.DEBUG_PHOTO, "camera release");
                        camera.release();
                    }

                    camera = Camera.open(cameraId);    
                    camera.startPreview(); 
                    Log.d(konstanten.DEBUG_PHOTO, "Take Picture ...");
                    camera.takePicture(null, null, new PhotoHandler(this));
                    Log.d(konstanten.DEBUG_PHOTO, "Picture successfully taken ..");
                    Toast.makeText(getApplicationContext(), "camera takepicture", Toast.LENGTH_SHORT).show();
                    }
                    catch (Exception e)
                    {
                        Log.d(konstanten.DEBUG_PHOTO, "ERROR: " + e.getMessage());
                        Toast.makeText(getApplicationContext(), "ERROR: " + e.getMessage(), Toast.LENGTH_SHORT).show();
                    } 
                }

            }

    } catch (Exception e)
    {
        Log.d(konstanten.DEBUG_PHOTO, "Error: " + e.getMessage());
        Toast.makeText(getApplicationContext(), "ERROR:" + e.getMessage(), Toast.LENGTH_SHORT).show();
    }

}

private int findFrontFacingCamera() 
{
    int cameraId = -1;
    // Search for the front facing camera
    int numberOfCameras = Camera.getNumberOfCameras();
    for (int i = 0; i < numberOfCameras; i++) 
    {
        CameraInfo info = new CameraInfo();
        Camera.getCameraInfo(i, info);
        if (info.facing == CameraInfo.CAMERA_FACING_FRONT) 
        {
            Log.d(konstanten.DEBUG_PHOTO, "Camera found");
            cameraId = i;
            break;
        }
    }
    return cameraId;
}

这是我的PhotoHandler课程：

package com.example.messenger;

import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.TimeUnit;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

public class PhotoHandler implements PictureCallback 
{

    private final Context context;

    public PhotoHandler(Context context) 
    {
        Log.d(konstanten.DEBUG_PHOTO, "PhotoHandler constructor called");
        this.context = context;
    }

    @Override
    public void onPictureTaken(byte[] data, Camera camera) 
    {

        Log.d(konstanten.DEBUG_PHOTO, "onPictureTaken called");
        Toast.makeText(context, "OnPictureTaken", Toast.LENGTH_LONG).show();
        File pictureFileDir = getDir();

        if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) 
        {
            Log.d(konstanten.DEBUG_PHOTO, "Can't create directory to save image.");
            Toast.makeText(context, "Can't create directory to save image.", Toast.LENGTH_LONG).show();
            return;
        }

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
        String date = dateFormat.format(new Date());
        String photoFile = "Picture_" + date + ".jpg";

        String filename = pictureFileDir.getPath() + File.separator + photoFile;

        File pictureFile = new File(filename);

        try 
        {
            Log.d(konstanten.DEBUG_PHOTO, "Begin Fileoutputstream");
            FileOutputStream fos = new FileOutputStream(pictureFile);
            fos.write(data);
            fos.close();
            Toast.makeText(context, "New Image saved:" + photoFile,
                    Toast.LENGTH_LONG).show();
            Log.d(konstanten.DEBUG_PHOTO, "Image saved: " + photoFile);
        } catch (Exception error) {
            Log.d(konstanten.DEBUG_PHOTO, "File" + filename + "not saved: "
                    + error.getMessage());
            Toast.makeText(context, "Image could not be saved.",
                    Toast.LENGTH_LONG).show();
        }
        camera.stopPreview();
        camera.release();
        Log.d(konstanten.DEBUG_PHOTO, "onTakePicture end");
    }

    private File getDir() 
    {
        File sdDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        return new File(sdDir, konstanten.AppName);
    }
}

LogCat-Output（对于DEBUG_PHOTO-Tag）：

06-25 16:41:37.831: D/PHOTO-HANDLER(16917): onMessage called:Hello World! 06-25 16:41:37.841: D/PHOTO-HANDLER(16917): Handler started 06-25 16:41:37.876: D/PHOTO-HANDLER(16917): Camera found 06-25 16:41:38.886: D/PHOTO-HANDLER(16917): Take Picture ... 06-25 16:41:38.911: D/PHOTO-HANDLER(16917): PhotoHandler constructor called 06-25 16:41:39.021: D/PHOTO-HANDLER(16917): Picture successfully taken ..