Coverflow, die Gallery (veraltet nicht richtig funktioniert in> 4.0-Geräte) erstreckt

Question

ich diese Klasse bin mit einem Cover-Flow in meiner app zu erreichen:

public class CoverFlow extends Gallery { 

/** 
* Graphics Camera used for transforming the matrix of ImageViews 
*/ 
private Camera mCamera = new Camera(); 

/** 
* The maximum angle the Child ImageView will be rotated by 
*/  
private int mMaxRotationAngle = 60; 

/** 
* The maximum zoom on the centre Child 
*/ 
private int mMaxZoom = -175; 

/** 
* The Centre of the Coverflow 
*/ 
private int mCoveflowCenter; 



public CoverFlow(Context context) { 
    super(context); 
    this.setStaticTransformationsEnabled(true); 
} 

public CoverFlow(Context context, AttributeSet attrs) { 
    super(context, attrs); 
     this.setStaticTransformationsEnabled(true); 
} 

    public CoverFlow(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    this.setStaticTransformationsEnabled(true); 
    } 

    /** 
    * Get the max rotational angle of the image 
    * @return the mMaxRotationAngle 
    */ 
public int getMaxRotationAngle() { 
    return mMaxRotationAngle; 
} 

/** 
    * Set the max rotational angle of each image 
    * @param maxRotationAngle the mMaxRotationAngle to set 
    */ 
public void setMaxRotationAngle(int maxRotationAngle) { 
    mMaxRotationAngle = maxRotationAngle; 
} 

/** 
    * Get the Max zoom of the centre image 
    * @return the mMaxZoom 
    */ 
public int getMaxZoom() { 
    return mMaxZoom; 
} 

/** 
    * Set the max zoom of the centre image 
    * @param maxZoom the mMaxZoom to set 
    */ 
public void setMaxZoom(int maxZoom) { 
    mMaxZoom = maxZoom; 
} 

/** 
    * Get the Centre of the Coverflow 
    * @return The centre of this Coverflow. 
    */ 
    private int getCenterOfCoverflow() { 
     return (getWidth() - getPaddingLeft() - getPaddingRight())/2 + getPaddingLeft(); 
    } 

    /** 
    * Get the Centre of the View 
    * @return The centre of the given view. 
    */ 
    private static int getCenterOfView(View view) { 
     return view.getLeft() + view.getWidth()/2; 
    } 
    /** 
    * {@inheritDoc} 
    * 
    * @see #setStaticTransformationsEnabled(boolean) 
    */ 
    protected boolean getChildStaticTransformation(View child, Transformation t) { 

    final int childCenter = getCenterOfView(child); 
    final int childWidth = child.getWidth() ; 
    int rotationAngle = 0; 

    t.clear(); 
    t.setTransformationType(Transformation.TYPE_MATRIX); 

     if (childCenter == mCoveflowCenter) { 
      //PARCHE!!! 4.1 
      if (Build.VERSION.SDK_INT > Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1){ 

      } else { 
       transformImageBitmap((ImageView) child, t, 0); 
      } 

     } else { 

      rotationAngle = (int) (((float) (mCoveflowCenter - childCenter)/ childWidth) * mMaxRotationAngle); 
      if (Math.abs(rotationAngle) > mMaxRotationAngle) { 
      rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle; 
      } 
      //PARCHE!!! 4.1 
      if (Build.VERSION.SDK_INT > Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1){ 
       //no apliquem transformacio. 
      } else { 
       transformImageBitmap((ImageView) child, t, rotationAngle); 
      }  
     }  

    return true; 
} 

/** 
    * This is called during layout when the size of this view has changed. If 
    * you were just added to the view hierarchy, you're called with the old 
    * values of 0. 
    * 
    * @param w Current width of this view. 
    * @param h Current height of this view. 
    * @param oldw Old width of this view. 
    * @param oldh Old height of this view. 
    */ 
    protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
     mCoveflowCenter = getCenterOfCoverflow(); 
     super.onSizeChanged(w, h, oldw, oldh); 
    } 

    /** 
     * Transform the Image Bitmap by the Angle passed 
     * 
     * @param imageView ImageView the ImageView whose bitmap we want to rotate 
     * @param t transformation 
     * @param rotationAngle the Angle by which to rotate the Bitmap 
     */ 
    private void transformImageBitmap(ImageView child, Transformation t, int rotationAngle) {    
     mCamera.save(); 
     final Matrix imageMatrix = t.getMatrix();; 
     final int imageHeight = child.getLayoutParams().height; 
     final int imageWidth = child.getLayoutParams().width; 
     final int rotation = Math.abs(rotationAngle); 

     mCamera.translate(0.0f, 0.0f, 100.0f); 

     //As the angle of the view gets less, zoom in  
     if (rotation < mMaxRotationAngle) { 
     float zoomAmount = (float) (mMaxZoom + (rotation * 2.9)); 
     mCamera.translate(0.0f, 0.0f, zoomAmount);   
     } 

     mCamera.rotateY(rotationAngle); 
     mCamera.getMatrix(imageMatrix);    
     imageMatrix.preTranslate(-(imageWidth/2), -(imageHeight/2)); 
     imageMatrix.postTranslate((imageWidth/2), (imageHeight/2)); 
     mCamera.restore(); 
} 
} 

Aber diesen Code, nach dem 4.0-Gerät wie 4.1 oder 4.2 funktioniert nicht mehr gut.

Ich habe einige Debug getan, so modifizierte ich diesen Teil:

//As the angle of the view gets less, zoom in  
    if (rotation < mMaxRotationAngle) { 
     Log.d("sergi",""+rotation); 
    float zoomAmount = (float) (mMaxZoom + (rotation * 2.9)); 
    mCamera.translate(0.0f, 0.0f, zoomAmount);   
    } 

Und wieder diese auf einem 4.0.4 Gerät, während ein Bild von rechts nach links swipping:

03-20 11:11:43.145: D/debugging(15987): 1 
03-20 11:11:43.160: D/debugging(15987): 54 
03-20 11:11:43.160: D/debugging(15987): 59 
03-20 11:11:43.160: D/debugging(15987): 2 
03-20 11:11:43.176: D/debugging(15987): 53 
03-20 11:11:43.176: D/debugging(15987): 3 
03-20 11:11:43.192: D/debugging(15987): 52 
03-20 11:11:43.192: D/debugging(15987): 4 
03-20 11:11:43.207: D/debugging(15987): 51 
03-20 11:11:43.207: D/debugging(15987): 5 
03-20 11:11:43.223: D/debugging(15987): 50 
03-20 11:11:43.223: D/debugging(15987): 6 
03-20 11:11:43.239: D/debugging(15987): 48 
03-20 11:11:43.239: D/debugging(15987): 8 
03-20 11:11:43.254: D/debugging(15987): 47 
03-20 11:11:43.254: D/debugging(15987): 9 

Und auf einem 4.1-Gerät gab es zurück:

Wie Sie sehen können, im Grunde, was passiert, ist das die gleiche Methode, wird nicht auf die gleiche Weise zwischen zwei verschiedenen Apis verwendet.

Wie Sie sehen können, erweitert CoverFlow Gallery, die veraltet ist, aber nicht entfernt, so verstehe ich nicht, was der Unterschied ist. Ich würde mich freuen, wenn wir zu einem Workaround kommen können.

Danke.

Answer 1

Vielleicht wird dies helfen:

protected boolean getChildStaticTransformation(View child, Transformation t) 
{ 
       ..... 

    if (Build.VERSION.SDK_INT >= 16) child.invalidate(); 

    return true; 
} 

Das das Kind ungültig wird und die Animation machen anwenden.