我正在创建一个相机应用程序。捕获的图像显示在 GridView 中。 现在，代码在除三星设备之外的所有设备上都可以正常运行。

我遇到方向问题。当我以纵向模式拍摄图像时，图像在 GridView 中显示时会旋转。我没有保留任何旋转代码。 其次，使用 EXIF 我在 GridView 中获得了正确的图像，但是当设备方向改变时，图像再次以奇怪的方式旋转。

附上图片:

抱歉图像的分辨率。请让我知道它们是否不可见。会再上传。我知道在 SO 上有很多这样的帮助。但我想我被困在某个地方了。

我指的是以下链接:

http://blog.andolasoft.com/2013/06/how-to-show-captured-images-dynamically-in-gridview-layout.html

最佳答案

这是我使用的代码(它适用于所有设备):

这部分是我在主要 Activity 中将拍摄的照片设置到 ImageView 的地方:

            try {
                File imageFile = new File(cursor.getString(0));
                ExifInterface exif = new ExifInterface(
                        imageFile.getAbsolutePath());
                int orientation = exif.getAttributeInt(
                        ExifInterface.TAG_ORIENTATION,
                        ExifInterface.ORIENTATION_NORMAL);
                switch (orientation) {
                case ExifInterface.ORIENTATION_ROTATE_270:
                    rotate = 270;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    rotate = 180;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_90:
                    rotate = 90;
                    break;
                }

                Log.v("", "Exif orientation: " + orientation);
            } catch (Exception e) {
                e.printStackTrace();
            }
            Matrix matrix = new Matrix();
            matrix.postRotate(rotate);
            bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);
            testImage.setImageBitmap(null);
            testImage.setImageBitmap(bmp);

相机 Activity 中的常量值:

  private static final int ORIENTATION_PORTRAIT_NORMAL =  1;
  private static final int ORIENTATION_PORTRAIT_INVERTED =  2;
  private static final int ORIENTATION_LANDSCAPE_NORMAL =  3;
  private static final int ORIENTATION_LANDSCAPE_INVERTED =  4;
  private OrientationEventListener mOrientationEventListener;
  private int mOrientation =  -1;

相机 Activity 中的回调函数:

      Camera.PictureCallback photoCallback=new Camera.PictureCallback(){
          public void onPictureTaken(final byte[] data, final Camera camera){

              dialog=ProgressDialog.show(CameraActivity.this,"","Please wait while the photo is being saved..");
              new Thread(){
                  public void run(){
                      try{
                          Thread.sleep(1000);         
                      }
                      catch(Exception ex){}
                      onPictureTake(data,camera);     
                  }
              }.start();      
          }
      };

相机 Activity 中的拍照功能:

      public void onPictureTake(byte[] data, Camera camera){
          switch (mOrientation) {
          case ORIENTATION_PORTRAIT_NORMAL:
              rotate = 90;
              break;
          case ORIENTATION_LANDSCAPE_NORMAL:
              rotate = 0;
              break;
          case ORIENTATION_PORTRAIT_INVERTED:
              rotate = 270;
              break;
          case ORIENTATION_LANDSCAPE_INVERTED:
              rotate = 180;
              break;
          }

          Matrix matrix = new Matrix();
          matrix.postRotate(rotate);
          bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
          bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);
          mutableBitmap = bmp.copy(Bitmap.Config.ARGB_8888, true);
          savePhoto(mutableBitmap);
          dialog.dismiss();
          flag = 0;
          finish();
      }

在相机 Activity 的 onresume 中调用的方向监听器:

mOrientationEventListener = new OrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL) {

                @SuppressWarnings("deprecation")
                @Override
                public void onOrientationChanged(int orientation) {

                    // determine our orientation based on sensor response
                    int lastOrientation = mOrientation;

                    Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();   
                    int rotation = getWindowManager().getDefaultDisplay().getRotation();
                    System.out.println(rotation+"");

                if (display.getOrientation() != Surface.ROTATION_0) {   // landscape oriented devices
                        System.out.println("LANDSCAPE");
                        if (orientation >= 315 || orientation < 45) {
                            if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {                         
                                mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
                            }
                        } else if (orientation < 315 && orientation >= 225) {
                            if (mOrientation != ORIENTATION_PORTRAIT_INVERTED) {
                                mOrientation = ORIENTATION_PORTRAIT_INVERTED;
                            }                       
                        } else if (orientation < 225 && orientation >= 135) {
                            if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
                                mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
                            }                       
                        } else if (orientation <135 && orientation > 45) { 
                            if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
                                mOrientation = ORIENTATION_PORTRAIT_NORMAL;
                            }                       
                        }                       
                    } else {  // portrait oriented devices
                        System.out.println("PORTRAIT");
                        if (orientation >= 315 || orientation < 45) {
                            if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {                          
                                mOrientation = ORIENTATION_PORTRAIT_NORMAL;
                            }
                        } else if (orientation < 315 && orientation >= 225) {
                            if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {
                                mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
                            }                       
                        } else if (orientation < 225 && orientation >= 135) {
                            if (mOrientation != ORIENTATION_PORTRAIT_INVERTED) {
                                mOrientation = ORIENTATION_PORTRAIT_INVERTED;
                            }                       
                        } else if (orientation <135 && orientation > 45) { 
                            if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
                                mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
                            }                       
                        }
                    }

                }
            };

关于android - android 中三星设备上的相机捕获方向，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18203369/