Gallery重疊效果

http://www.eoeandroid.com/forum.php?mod=viewthread&tid=97392&extra=page%3D2&page=1

 

 

import javax.security.auth.login.LoginException;
import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;
import com.ioffice.home.R;

//自己定義的Gallery
public class CoverFlow extends Gallery {

//mCamera是用來做類3D效果處理，比如Z軸方向上的平移，繞Y軸的旋轉等
private Camera mCamera = new Camera();
//mMaxRotationAngle是圖片繞Y軸最大旋轉角度，也就是屏幕最邊上那兩張圖片的旋轉角度
private int mMaxRotationAngle = 50;
//mMaxZoom是圖片在Z軸平移的距離，視覺上看上進心來就是放大縮小的效果
private int mMaxZoom = -200;
private int mCoveflowCenter;
private boolean mAlphaMode = true;
private boolean mCircleMode = false;
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);
}
public int getMaxRotationAngle() {
return mMaxRotationAngle;
}
public void setMaxRotationAngle(int maxRotationAngle) {
mMaxRotationAngle = maxRotationAngle;
}
public boolean getCircleMode() {
return mCircleMode;
}
public void setCircleMode(boolean isCircle) {
mCircleMode = isCircle;
}
public boolean getAlphaMode() {
return mAlphaMode;
}
public void setAlphaMode(boolean isAlpha) {
mAlphaMode = isAlpha;
}
public int getMaxZoom() {
return mMaxZoom;
}
public void setMaxZoom(int maxZoom) {
mMaxZoom = maxZoom;
}
private int getCenterOfCoverflow() {
return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2
+ getPaddingLeft();
}
//獲取視圖中心
private static int getCenterOfView(View view) {
return view.getLeft() + view.getWidth() / 2;
}
//重寫Garray方法 ，產生層疊和放大效果
@Override
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) {
transformImageBitmap( child, t, 0, 0);
} else {
rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
// Log.d("test", "recanglenum:"+Math.floor ((mCoveflowCenter -
// childCenter) / childWidth));

/*if (Math.abs(rotationAngle) > mMaxRotationAngle) {
rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle
: mMaxRotationAngle;
}*/
transformImageBitmap( child, t, rotationAngle,
(int) Math.floor((mCoveflowCenter - childCenter)/ (childWidth==0?1:childWidth)));
}
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(View child, Transformation t,
int rotationAngle, int d) {
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) (-140 + (rotation *2 ));
if(rotationAngle<0){
mCamera.translate((float) (-rotation*0.5), (float) (-rotation*0.3)+5, zoomAmount);
}else{
mCamera.translate((float) rotation, (float) (-rotation*0.3)+5, zoomAmount);

}
Log.i("info","---------------------->"+rotationAngle);
if (mCircleMode) {
if (rotation < 40){
mCamera.translate(0.0f, 155, 0.0f);
}else{
mCamera.translate(0.0f, (255 - rotation * 2.5f), 0.0f);
}
}
if (mAlphaMode) {
//child.setBackgroundDrawable(getResources().getDrawable(R.drawable.app_bg));
//child.setBackgroundColor(255);
}
// }
//mCamera.rotateY(rotationAngle);
mCamera.getMatrix(imageMatrix);
imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
mCamera.restore();
}
//重載視圖顯示順序讓左到中間顯示，再到右到中間顯示
protected int getChildDrawingOrder(int childCount,int i){
long t=getSelectedItemId();
int h=getSelectedItemPosition();
if(i<childCount/2){
return i;
}
return childCount-i-1+childCount/2;
}
}