Android实现左滑退出Activity（完美封装）
作者：互联网
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
解决问题:这个会出现左滑 背景白色问题
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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标签：event,左滑,int,SildingFinishLayout,private,touchView,Activity,Android,public 来源： https://www.cnblogs.com/www642830685/p/14086933.html