手势滑动销毁Activity

老是效仿ios，做android的真悲催！
有需求：需要手势滑动销毁一个Activity
怎么办尼？自己写？
不用~，网上先问一下百度。
结果：http://blog.csdn.net/xiaanming/article/details/20934541


首先将你需要的Activity继承SwipeBackActivity，它会在你的布局根目录新增一层SwipeBackLayout包裹，接下去就是SwipeBackLayout的事了，你什么都不用管！

import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.LayoutInflater;import com.example.view.SwipeBackLayout;/** * 想要实现向右滑动删除Activity效果只需要继承SwipeBackActivity即可，如果当前页面含有ViewPager * 只需要调用SwipeBackLayout的setViewPager()方法即可 *  * @author xiaanming * */public class SwipeBackActivity extends Activity {protected SwipeBackLayout layout;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);layout = (SwipeBackLayout) LayoutInflater.from(this).inflate(R.layout.base, null);layout.attachToActivity(this);}@Overridepublic void startActivity(Intent intent) {super.startActivity(intent);overridePendingTransition(R.anim.base_slide_right_in, R.anim.base_slide_remain);}// Press the back button in mobile phone@Overridepublic void onBackPressed() {super.onBackPressed();overridePendingTransition(0, R.anim.base_slide_right_out);}}

import java.util.LinkedList;import java.util.List;import android.app.Activity;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v4.view.ViewPager;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup;import android.widget.FrameLayout;import android.widget.Scroller;import com.example.slidingfinish.R;/** *  * @author xiaanming *  * @blog http://blog.csdn.net/xiaanming *  */public class SwipeBackLayout extends FrameLayout {private static final String TAG = SwipeBackLayout.class.getSimpleName();private View mContentView;private int mTouchSlop;private int downX;private int downY;private int tempX;private Scroller mScroller;private int viewWidth;private boolean isSilding;private boolean isFinish;private Drawable mShadowDrawable;private Activity mActivity;private List<ViewPager> mViewPagers = new LinkedList<ViewPager>();public SwipeBackLayout(Context context, AttributeSet attrs) {this(context, attrs, 0);}public SwipeBackLayout(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();mScroller = new Scroller(context);mShadowDrawable = getResources().getDrawable(R.drawable.shadow_left);}public void attachToActivity(Activity activity) {mActivity = activity;TypedArray a = activity.getTheme().obtainStyledAttributes(new int[] { android.R.attr.windowBackground });int background = a.getResourceId(0, 0);a.recycle();ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);decorChild.setBackgroundResource(background);decor.removeView(decorChild);addView(decorChild);setContentView(decorChild);decor.addView(this);}private void setContentView(View decorChild) {mContentView = (View) decorChild.getParent();}/** * 事件拦截操作 */@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {//处理ViewPager冲突问题ViewPager mViewPager = getTouchViewPager(mViewPagers, ev);Log.i(TAG, "mViewPager = " + mViewPager);if(mViewPager != null && mViewPager.getCurrentItem() != 0){return super.onInterceptTouchEvent(ev);}switch (ev.getAction()) {case MotionEvent.ACTION_DOWN:downX = tempX = (int) ev.getRawX();downY = (int) ev.getRawY();break;case MotionEvent.ACTION_MOVE:int moveX = (int) ev.getRawX();// 满足此条件屏蔽SildingFinishLayout里面子类的touch事件if (moveX - downX > mTouchSlop&& Math.abs((int) ev.getRawY() - downY) < mTouchSlop) {return true;}break;}return super.onInterceptTouchEvent(ev);}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_MOVE:int moveX = (int) event.getRawX();int deltaX = tempX - moveX;tempX = moveX;if (moveX - downX > mTouchSlop&& Math.abs((int) event.getRawY() - downY) < mTouchSlop) {isSilding = true;}if (moveX - downX >= 0 && isSilding) {mContentView.scrollBy(deltaX, 0);}break;case MotionEvent.ACTION_UP:isSilding = false;if (mContentView.getScrollX() <= -viewWidth / 2) {isFinish = true;scrollRight();} else {scrollOrigin();isFinish = false;}break;}return true;}/** * 获取SwipeBackLayout里面的ViewPager的集合 * @param mViewPagers * @param parent */private void getAlLViewPager(List<ViewPager> mViewPagers, ViewGroup parent){int childCount = parent.getChildCount();for(int i=0; i<childCount; i++){View child = parent.getChildAt(i);if(child instanceof ViewPager){mViewPagers.add((ViewPager)child);}else if(child instanceof ViewGroup){getAlLViewPager(mViewPagers, (ViewGroup)child);}}}/** * 返回我们touch的ViewPager * @param mViewPagers * @param ev * @return */private ViewPager getTouchViewPager(List<ViewPager> mViewPagers, MotionEvent ev){if(mViewPagers == null || mViewPagers.size() == 0){return null;}Rect mRect = new Rect();for(ViewPager v : mViewPagers){v.getHitRect(mRect);if(mRect.contains((int)ev.getX(), (int)ev.getY())){return v;}}return null;}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {super.onLayout(changed, l, t, r, b);if (changed) {viewWidth = this.getWidth();getAlLViewPager(mViewPagers, this);Log.i(TAG, "ViewPager size = " + mViewPagers.size());}}@Overrideprotected void dispatchDraw(Canvas canvas) {super.dispatchDraw(canvas);if (mShadowDrawable != null && mContentView != null) {int left = mContentView.getLeft()- mShadowDrawable.getIntrinsicWidth();int right = left + mShadowDrawable.getIntrinsicWidth();int top = mContentView.getTop();int bottom = mContentView.getBottom();mShadowDrawable.setBounds(left, top, right, bottom);mShadowDrawable.draw(canvas);}}/** * 滚动出界面 */private void scrollRight() {final int delta = (viewWidth + mContentView.getScrollX());// 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动itemmScroller.startScroll(mContentView.getScrollX(), 0, -delta + 1, 0,Math.abs(delta));postInvalidate();}/** * 滚动到起始位置 */private void scrollOrigin() {int delta = mContentView.getScrollX();mScroller.startScroll(mContentView.getScrollX(), 0, -delta, 0,Math.abs(delta));postInvalidate();}@Overridepublic void computeScroll() {// 调用startScroll的时候scroller.computeScrollOffset()返回true，if (mScroller.computeScrollOffset()) {mContentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());postInvalidate();if (mScroller.isFinished() && isFinish) {mActivity.finish();}}}}

剩下的都是几个动画文件和图片，见源码。


另一个使用手势操作退出activity的库。可以设置swipe 的方向（左 上 右 下）
http://www.jcodecraeer.com/a/opensource/2015/0305/2540.html

https://github.com/ikew0ng/SwipeBackLayout

通过修改 support-v4 包中 SlidingPaneLayout 的源码来实现滑动返回布局
http://www.see-source.com/androidwidget/detail.html?wid=1149