人人客户端滑动效果的实现

package luffy.com.cn.view; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import android.view.ViewTreeObserver; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.DecelerateInterpolator; import android.view.animation.TranslateAnimation; public class SlideMenuView extends ViewGroup { private int leftMargin; private int gap; public SlideMenuView(Context context, View backView, View frontView) { super(context); LayoutParams lp = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); addView(backView, lp); addView(frontView, lp); } public SlideMenuView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { checkChildCount(); for (int i = 0; i < getChildCount(); i++) { View child = getChildAt(i); int height = child.getMeasuredHeight(); int width = child.getMeasuredWidth(); if (i == 1) { child.layout(leftMargin, 0, leftMargin + width, height); } else { child.layout(0, 0, width, height); } } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); final int widthMode = MeasureSpec.getMode(widthMeasureSpec); if (widthMode != MeasureSpec.EXACTLY) { throw new IllegalStateException( "ScrollLayout only canmCurScreen run at EXACTLY mode!"); } final int heightMode = MeasureSpec.getMode(heightMeasureSpec); if (heightMode != MeasureSpec.EXACTLY) { throw new IllegalStateException( "ScrollLayout only can run at EXACTLY mode!"); } final int count = getChildCount(); for (int i = 0; i < count; i++) { getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec); } } /** * 使用之前先传入需要留下间隔的宽度。或者调用setGap(final View measureView)。 * * @param gap * 间隔宽度 */ public void setGap(int gap) { this.gap = gap; // invalidate(); } /** * 使用之前先传入要留下的空间。或者调用setGap(int gap)。 * * @param measureView * 间隔宽度 * @param gap * 间隔修正值，无需修正传入0 */ public void setGap(final View measureView, final int resize) { ViewTreeObserver vto = measureView.getViewTreeObserver(); vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { int width = measureView.getMeasuredWidth(); gap = width; getChildAt(0).setPadding(0, 0, gap + resize, 0); setGap(gap + resize); } }); } private void checkChildCount() { if (2 != getChildCount()) { throw new IndexOutOfBoundsException("只允许拥有2个子View!"); } } private void setLeftMargin(int leftMargin) { this.leftMargin = leftMargin; } private void ani(final int from, final int to, final int left) { final View v = getChildAt(1); TranslateAnimation translateAnimation = new TranslateAnimation(from, to, 0, 0); translateAnimation.setInterpolator(new DecelerateInterpolator()); translateAnimation.setFillAfter(true); translateAnimation.setDuration(250); translateAnimation.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { setLeftMargin(left); } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { v.clearAnimation(); v.layout(left, 0, left + getWidth(), v.getHeight()); } }); v.startAnimation(translateAnimation); } public boolean isMenuOpen() { if (getChildAt(1).getLeft() == 0) { return false; } return true; } public void sliding() { if (isMenuOpen()) { ani(0, gap - getWidth(), 0); } else { ani(0, getWidth() - gap, getWidth() - gap); } } }