Android实现左滑退出Activity的完美封装

1：定义一个自己的父级容器，让它继承自一个布局（LinearLayout、RelativeLayout都可以）

public class SildingFinishLayout extends RelativeLayout implements View.OnTouchListener { /** * SildingFinishLayout布局的父布局 */ private ViewGroup mParentView; /** * 处理滑动逻辑的View */ private View touchView; /** * 滑动的最小距离 */ private int mTouchSlop; /** * 按下点的X坐标 */ private int downX; /** * 按下点的Y坐标 */ private int downY; /** * 临时存储X坐标 */ private int tempX; /** * 滑动类 */ private Scroller mScroller; /** * SildingFinishLayout的宽度 */ private int viewWidth; /** * 记录是否正在滑动 */ private boolean isSilding; private OnSildingFinishListener onSildingFinishListener; private boolean isFinish; public SildingFinishLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SildingFinishLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); mScroller = new Scroller(context); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (changed) {// 获取SildingFinishLayout所在布局的父布局 mParentView = (ViewGroup) this.getParent(); viewWidth = this.getWidth(); } } /** * 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity * * @param onSildingFinishListener */ public void setOnSildingFinishListener( OnSildingFinishListener onSildingFinishListener) { this.onSildingFinishListener = onSildingFinishListener; } /** * 设置Touch的View * * @param touchView */ public void setTouchView(View touchView) { this.touchView = touchView; touchView.setOnTouchListener(this); } public View getTouchView() { return touchView; } /** * 滚动出界面 */ private void scrollRight() { final int delta = (viewWidth + mParentView.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item mScroller.startScroll(mParentView.getScrollX(), 0, -delta + 1, 0,Math.abs(delta)); postInvalidate(); } /** * 滚动到起始位置 */ private void scrollOrigin() { int delta = mParentView.getScrollX(); mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0,Math.abs(delta)); postInvalidate(); } /** * touch的View是否是AbsListView， 例如ListView, GridView等其子类 * * @return */ private boolean isTouchOnAbsListView() { return touchView instanceof AbsListView ? true : false; } /** * touch的view是否是ScrollView或者其子类 * * @return */ private boolean isTouchOnScrollView() { return touchView instanceof ScrollView ? true : false; } @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN:downX = tempX = (int) event.getRawX();downY = (int) event.getRawY();break; case MotionEvent.ACTION_MOVE:int moveX = (int) event.getRawX();int deltaX = tempX - moveX;tempX = moveX;if (Math.abs(moveX - downX) > mTouchSlop && Math.abs((int) event.getRawY() - downY) < mTouchSlop) { isSilding = true;// 若touchView是AbsListView，// 则当手指滑动，取消item的点击事件，不然我们滑动也伴随着item点击事件的发生 if (isTouchOnAbsListView()) { MotionEvent cancelEvent = MotionEvent.obtain(event); cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); v.onTouchEvent(cancelEvent); }}if (moveX - downX >= 0 && isSilding) { mParentView.scrollBy(deltaX, 0);// 屏蔽在滑动过程中ListView ScrollView等自己的滑动事件 if (isTouchOnScrollView() || isTouchOnAbsListView()) { return true; }}break; case MotionEvent.ACTION_UP:isSilding = false;if (mParentView.getScrollX() <= -viewWidth / 2) { isFinish = true; scrollRight();} else { scrollOrigin(); isFinish = false;}break; }// 假如touch的view是AbsListView或者ScrollView 我们处理完上面自己的逻辑之后// 再交给AbsListView, ScrollView自己处理其自己的逻辑 if (isTouchOnScrollView() || isTouchOnAbsListView()) { return v.onTouchEvent(event); }// 其他的情况直接返回true return true; } @Override public void computeScroll() {// 调用startScroll的时候scroller.computeScrollOffset()返回true， if (mScroller.computeScrollOffset()) { mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); if (mScroller.isFinished()) {if (onSildingFinishListener != null && isFinish) { onSildingFinishListener.onSildingFinish();} } } } public interface OnSildingFinishListener { public void onSildingFinish(); }}

2.Acitity

在Activity的onCreate（）方法里面

@Override public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) { super.onCreate(savedInstanceState, persistentState); SildingFinishLayout mSildingFinishLayout = (SildingFinishLayout) findViewById(R.id.timed_task_SildingFinishLayout);mSildingFinishLayout mSildingFinishLayout .setOnSildingFinishListener(new SildingFinishLayout.OnSildingFinishListener() { @Override public void onSildingFinish() {finish(); } }); mSildingFinishLayout .setTouchView(mSildingFinishLayout);//绑定底层的布局就可以了 :不起作用的话换个你activity 布局里面view就可以啦 }

截止目前，这个功能已经实现了

1.style.xml中中增加

<style name='AppTheme' parent='android:Theme.Light'> <item name='android:windowIsTranslucent'>true</item> <item name='android:windowNoTitle'>true</item> <item name='android:windowBackground'>@android:color/transparent</item></style>

2 acvitiy 的属性中加上

android:theme='@style/AppTheme'

3 一些属性的详解

<item name='android:windowFrame'>@null</item> ：Dialog的windowFrame框为无<item name='android:windowIsFloating'>true</item>：是否浮现在activity之上<item name='android:windowIsTranslucent'>false</item>:是否半透明<item name='android:windowNoTitle'>true</item>:是否显示title<item name='android:windowBackground'>@drawable/dia_bg</item>:设置dialog的背景<item name='android:backgroundDimEnabled'>false</item>: 背景是否透明显示

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