gallery重叠特效源码+注释.zip

package guo.com; 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; public class CoverFlow extends Gallery { // mCamera是用来做类3D效果处理，比如Z轴方向上的平移，绕Y轴的旋转等 private Camera mCamera = new Camera(); // mMaxRotationAngle是图片绕Y轴最大旋转角度，也就是屏幕最边上那两张图片的旋转角度 private int mMaxRotationAngle = 50; // mMaxZoom是图片在Z轴平移的距离，视觉上看上进心来就是放大缩小的效果 private int mMaxZoom = -200; private int mCoveflowCenter; private boolean mAlphaMode = true; private boolean mCircleMode = false; public CoverFlow(Context context) { super(context); // TODO Auto-generated constructor stub 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(); } // 获取视图中心 private static int getCenterOfView(View view) { return view.getLeft() + view.getWidth() / 2; } // 重写Garray方法 ，产生层叠和放大效果 @Override protected boolean getChildStaticTransformation(View child, Transformation t) { // TODO Auto-generated method stub 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. * 这就是所谓的布局过程中，当这个View的大小发生了变化。如果你刚刚添加到视图层次，你所谓的旧值0。 * @param w 这个View的当前宽度。 * @param h 这个View的当前高度。 * @param oldw 这个View的原先宽度。 * @param oldh 这个View的原先高度。 */ 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 * 通过角度改变Image Bitmap * @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(); } // 重载视图显示顺序让左到中间显示，再到右到中间显示 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; } }