Android ImageView -相机

Question

我一直在尝试实现此代码，我在其中从相机捕获图像并将其显示在我的图像查看器中，然后可以将其设置为墙纸。它在我的模拟器中运行良好，但在我的手机上，当我拍摄图像并单击“确定”时，它会强制关闭。有什么帮助吗？

ImageButton ib;
Button b;
ImageView iv;
Intent i;
final static int cameraData = 0;
Bitmap bmp;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.photo);
    initialize();
    InputStream is = getResources().openRawResource(R.drawable.icon);
    bmp = BitmapFactory.decodeStream(is);
}

private void initialize() {
    iv = (ImageView) findViewById(R.id.ivReturnedPic);
    ib = (ImageButton) findViewById(R.id.ibTakePic);
    b = (Button) findViewById(R.id.bSetWall);
    b.setOnClickListener(this);
    ib.setOnClickListener(this);
}

public void onClick(View v) {
    switch (v.getId()) {
    case R.id.bSetWall:
        try {
            getApplicationContext().setWallpaper(bmp);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        break;
    case R.id.ibTakePic:
        i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(i, cameraData);
        break;
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        bmp = (Bitmap) extras.get("data");
        iv.setImageBitmap(bmp);
    }
}

这让我发疯!

我认为这是 logcat 中的错误，

09-04 09:07:49.034: VERBOSE/com.miui.camera.CameraHolder(7499): camera released
09-04 09:07:49.064: WARN/System.err(7463): java.lang.NullPointerException
09-04 09:07:49.064: WARN/System.err(7463):     at com.aradhya.helloandroid.Camera.onActivityResult(Camera.java:72)
09-04 09:07:49.064: WARN/System.err(7463):     at android.app.Activity.dispatchActivityResult(Activity.java:3932)
09-04 09:07:49.064: WARN/System.err(7463):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2536)
09-04 09:07:49.064: WARN/System.err(7463):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:2582)
09-04 09:07:49.074: WARN/System.err(7463):     at android.app.ActivityThread.access$2000(ActivityThread.java:117)
09-04 09:07:49.074: WARN/System.err(7463):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:961)
09-04 09:07:49.074: WARN/System.err(7463):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-04 09:07:49.094: WARN/System.err(7463):     at android.os.Looper.loop(Looper.java:130)
09-04 09:07:49.094: WARN/System.err(7463):     at android.app.ActivityThread.main(ActivityThread.java:3694)
09-04 09:07:49.094: WARN/System.err(7463):     at java.lang.reflect.Method.invokeNative(Native Method)
09-04 09:07:49.094: WARN/System.err(7463):     at java.lang.reflect.Method.invoke(Method.java:507)
09-04 09:07:49.094: WARN/System.err(7463):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
09-04 09:07:49.104: WARN/System.err(7463):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
09-04 09:07:49.104: WARN/System.err(7463):     at dalvik.system.NativeStart.main(Native Method)
09-04 09:07:49.204: VERBOSE/com.miui.camera.Camera(7499): stopPreview
09-04 09:07:49.214: ERROR/com.miui.camera.ui.FocusRectangle(7499): clear
09-04 09:07:49.373: VERBOSE/com.miui.camera.Camera(7499): onStop
09-04 09:07:49.383: VERBOSE/com.miui.camera.Camera(7499): onDestroy

Answer 1

看来你的rom是MIUI(或者你用的是MUI相机)

我正在 MIUI 上使用我的 HTC Desire 进行一些安卓开发，看起来从相机返回的 Intent 数据与从安卓原生相机返回的通常 Intent 数据不同；您需要更改 Activity 结果以接受来自 MIUI 相机的数据(我目前正在研究这个，如果我能解决的话，我会发布我的解决方案)

编辑:好的，在调查了 miui 相机的 Intent 后，我设法解决了这个问题:从 MIUI 相机返回的数据不包含任何额外内容，但确实包含 sd 卡上图像的路径，所以我编辑了我的onActivityResult 根据返回数据中的内容相应地处理 Intent :

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode == CAMERA_PIC_REQUEST)
    {
        if(resultCode == RESULT_OK)
        {
            if(data.hasExtra("data"))
            {
                /* if the data has an extra called "data" we assume the returned data 
                 * is from the usual camera app*/

                //retrieve the bitmap from the intent
                Bitmap thumbnail = (Bitmap) data.getExtras().get("data");

                //update the image view with the bitmap
                myImageView.setImageBitmap(thumbnail);
            }
            else if(data.getExtras()==null)
            {
                /* if there are no extras we assume its the miui camera 
                 * (which returns the path to the image in the returned data)*/
                Toast.makeText(getApplicationContext(), "No extras to retrieve!",Toast.LENGTH_SHORT).show();

                //retrieve the path from the intent using data.getData().getPath() and create a BitmapDrawable using this path
                BitmapDrawable thumbnail = new BitmapDrawable(getResources(), data.getData().getPath());

                //update the image view with the newly created drawable
                myImageView.setImageDrawable(thumbnail); 

            }


        }
        else if (resultCode == RESULT_CANCELED)
        {
            Toast.makeText(getApplicationContext(), "Cancelled",Toast.LENGTH_SHORT).show();
        }

    }
}

EDIT2:在我的应用程序中，我还有一个选择器，可以使用图库从 SD 卡中选择现有图片，并且发现 MIUI 图库存在同样的问题，所以如果您在应用程序中也添加了一个图像选择器，请使用此代码对于 onActivityResult 有效:

else if (requestCode == GALLERY_REQUEST)
    {
        if(resultCode == RESULT_OK)
        {
             if (data != null) {
                  //our BitmapDrawable for the thumbnail
                  BitmapDrawable bmpDrawable = null;
                  //try to retrieve the image using the data from the intent
                  Cursor cursor = getContentResolver().query(data.getData(), null, null, null, null);
                  if(cursor != null)
                  {
                      /*if the query worked the cursor will not be null, 
                       * so we assume the normal gallery was used to choose the picture*/
                      cursor.moveToFirst();  //if not doing this, 01-22 19:17:04.564: ERROR/AndroidRuntime(26264): Caused by: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1
                      int idx = cursor.getColumnIndex(ImageColumns.DATA);
                      String fileSrc = cursor.getString(idx);
                      Bitmap bitmapPreview = BitmapFactory.decodeFile(fileSrc); //load preview image
                      bmpDrawable = new BitmapDrawable(bitmapPreview);//set the BitmapDrawable to the loaded image
                  }
                  else
                  {
                      /*if the cursor is null after the query the data returned is different so we assume 
                       * the miui gallery was used (so the data contains the path to the image)*/
                      bmpDrawable = new BitmapDrawable(getResources(), data.getData().getPath());
                  }
                  myImageView.setImageDrawable(bmpDrawable);//update our imageview with the BitmapDrawable
              }
              else {
                  Toast.makeText(getApplicationContext(), "Cancelled",Toast.LENGTH_SHORT).show();
              }
        }
        else if (resultCode == RESULT_CANCELED)
        {
            Toast.makeText(getApplicationContext(), "Cancelled",Toast.LENGTH_SHORT).show();
        }
    }