Question

当将使用相机拍摄的图像从相机意图返回到父目标（使用putExtra作为byte []）时，我在logcat中收到Failed binder事务错误。我不明白为什么，它不像它的大位图或任何东西。它只发生在我用大量光线拍照时，因为那时字节[]更大。离开相机意图时会发生错误。有没有人在我的代码中看到错误？

以下是相机意图的代码：

package example.imaging.ape;

import java.io.IOException;
import java.util.Iterator;
import java.util.Set;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnTouchListener;

public class TakePicture extends Activity implements SurfaceHolder.Callback{
     Camera mCamera;
     Boolean mPreviewRunning = false;
     int imageLayoutHeight;
     int imageLayoutWidth;

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

          //setup camera surface
          getWindow().setFormat(PixelFormat.TRANSLUCENT);
          requestWindowFeature(Window.FEATURE_NO_TITLE);
          getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
          setContentView(R.layout.cameralayout);

          SurfaceView mSurfaceView = (SurfaceView) findViewById(R.id.hist_surface_camera);
          SurfaceHolder mSurfaceHolder = mSurfaceView.getHolder();
          mSurfaceHolder.addCallback(this);
          mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
          Bundle extras = getIntent().getExtras();
          imageLayoutHeight = extras.getInt("layoutHeight");
          imageLayoutWidth = extras.getInt("layoutWidth");

          OnTouchListener touchListener = new View.OnTouchListener() {
               public boolean onTouch(View v, MotionEvent e) {

                    System.out.println("MAKING PICTURE");
                    mCamera.autoFocus(cb);             
                    return false;
               }
          };

          //setup touch listener
          mSurfaceView.setOnTouchListener(touchListener);

     }

     AutoFocusCallback cb = new AutoFocusCallback() {
          public void onAutoFocus(boolean success, Camera c) {
               c.takePicture(null, null, mPictureCallback);
          }   
     };

     Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
          public void onPictureTaken(byte[] imageData, Camera c) {
               System.out.println("Picture taken, now returning");              
               Intent resultIntent = new Intent();
               resultIntent.putExtra("cameraImage", imageData);
               System.out.println("put Extra");
               setResult(Activity.RESULT_OK, resultIntent);
               finish();           
          }
     };

     //initialize camera
     public void surfaceCreated(SurfaceHolder holder) {
          mCamera = Camera.open();
     }

     public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
          if (mPreviewRunning) {
               mCamera.stopPreview();
          }

          Camera.Parameters p = mCamera.getParameters();

          p.setPreviewSize(h, w);
          System.out.println("PreviewSize: " + h + "," + w);
          p.setPictureSize(h*3,w*3); // is around 1200x900
          p.set("rotation", 90);
          mCamera.setParameters(p);

          try {
               mCamera.setPreviewDisplay(holder);
          } catch (IOException e) {
               e.printStackTrace();
          }

          mCamera.startPreview();
          mPreviewRunning = true;
     }

     public void surfaceDestroyed(SurfaceHolder holder) {
          mCamera.stopPreview();
          mPreviewRunning = false;
          mCamera.release();
     }

}

以下是调用相机意图的代码：

Intent intent = new Intent(Example.this, TakePicture.class);
intent.putExtra("layoutWidth",layoutWidth);
intent.putExtra("layoutHeight",layoutHeight);                   
startActivityForResult(intent,0);

Answer 1

出于某种原因，当您尝试传递原始byte []数组或从其创建的Bitmap时，Android不喜欢。有些人已成功压缩生成的Bitmap并通过Intent传递它。我建议先将图像保存到文件中，然后通过Intent发送它的路径。

Answer 2

在远程过程调用期间，调用的参数和返回值将作为存储在Binder事务缓冲区中的Parcel对象进行传输。如果参数或返回值太大而不适合事务缓冲区，则调用将失败并抛出TransactionTooLargeException。

请参阅此链接表单android developer

Answer 3

模拟器在intent中丢失内存加载属性，因此发生异常

返回摄像机图像时失败的Binder事务

3 个答案: