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Android实现左滑退出Activity的完美封装

下载文本     言m默2022-09-28 12:50:34 41490

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 {    private ViewGroup mParentView;    private View touchView;    private int mTouchSlop;    private int downX;    private int downY;    private int tempX;    private Scroller mScroller;    private int viewWidth;    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();    }  }    public void setonSildingFinishListener( onSildingFinishListener onSildingFinishListener) {    this.onSildingFinishListener = onSildingFinishListener;  }    public void setTouchView(View touchView) {    this.touchView = touchView;    touchView.setonTouchListener(this);  }  public View getTouchView() {    return touchView;  }    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();  }    private void scrollOrigin() {    int delta = mParentView.getScrollX();    mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0, Math.abs(delta));    postInvalidate();  }    private boolean isTouchonAbsListView() {    return touchView instanceof AbsListView ? true : false;  }    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

  true  true  @android:color/transparent

2 acvitiy 的属性中加上

android:theme="@style/AppTheme" 

3 一些属性的详解

@null :Dialog的windowframe框为无true:是否浮现在activity之上false:是否半透明true:是否显示title@drawable/dia_bg:设置dialog的背景false: 背景是否透明显示

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