當方向改變發生時，是否可以旋轉圖像視圖？在Android中

Question

在我的應用程序中，我想旋轉方向更改時的圖像，

爲了做到這一點，我嘗試了這段代碼片段;

public Bitmap rotateImage(String image_path){ 

    Log.e("Inside rotATE IMAGE", "ROTATE"+image_path); 
    Matrix matrix = new Matrix(); 
    matrix.postRotate(getImageOrientation(image_path)); 

    bitmap= decodeFile(image_path); 
    Bitmap rotatedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), 
      bitmap.getHeight(), matrix, true); 


    return rotatedBitmap; 
} 

public static int getImageOrientation(String imagePath){ 
    int rotate = 0; 
    try { 

     File imageFile = new File(imagePath); 
     ExifInterface exif = new ExifInterface(
       imageFile.getAbsolutePath()); 
     int orientation = exif.getAttributeInt(
       ExifInterface.TAG_ORIENTATION, 
       ExifInterface.ORIENTATION_NORMAL); 
     Log.e("ori","or" +orientation); 

     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; 
     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    return rotate; 
} 

這是工作不錯，但它只是基於圖像的方向檢查在運行時的方向和旋轉圖像，我需要實時檢查設備的方向和要旋轉圖像以橫向模式，如果設備是在橫向，並反之亦然。任何人都可以幫助我??請提前致謝。

Answer 1

public void checkOrientation() { 
     SensorManager sensorManager = (SensorManager) this.getSystemService(Context.SENSOR_SERVICE); 
     sensorManager.registerListener(new SensorEventListener() { 
      int orientation = -1; 
      @Override 
      public void onSensorChanged(SensorEvent event) { 
       if (event.values[1] < 6.5 && event.values[1] > -6.5) { 
        if (orientation != 1) { 
         Log.d("Sensor", "Landscape"); 
         iv.setRotation(90f); 
        } 
        orientation = 1; 
       } else { 
        if (orientation != 0) { 
         Log.d("Sensor", "Portrait"); 
         iv.setRotation(0); 
        } 
        orientation = 0; 
       } 
      } 

      @Override 
      public void onAccuracyChanged(Sensor sensor, int accuracy) { 
       // TODO Auto-generated method stub 

      } 
     }, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_GAME); 
    } 

Answer 2

ON configuration changed u can detect like this; u will get a call back; 

    @Override 
public void onConfigurationChanged(Configuration newConfig) { 
    super.onConfigurationChanged(newConfig); 

    // Checks the orientation of the screen 
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { 
     Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show(); 
     getImageOrientation(); 
     rotateImage(); 

    } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){ 
     Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show(); 
     getImageOrientation(); 
     rotateImage(); 
    } 
} 

Answer 3

Try this simple code in your activity: 

@Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 
     // Checks the orientation of the screen 
     if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { 
      iv.setRotation(90f); 
      Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show(); 
     } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){ 
      iv.setRotation(0); 
      Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show(); 
     } 
    } 

and following line in your manifest in activity tag 
      android:configChanges="orientation|keyboardHidden|screenSize"