Android實現左滑退出Activity的完美封裝

阿新 • • 發佈：2020-12-16

1：定義一個自己的父級容器，讓它繼承自一個佈局（LinearLayout、RelativeLayout都可以）

public class SildingFinishLayout extends RelativeLayout implements View.OnTouchListener {
  /**
   * SildingFinishLayout佈局的父佈局
   */
  private ViewGroup mParentView;
  /**
   * 處理滑動邏輯的View
   */
  private View touchView;
  /**
   * 滑動的最小距離
   */
  private int mTouchSlop;
  /**
   * 按下點的X座標
   */
  private int downX;
  /**
   * 按下點的Y座標
   */
  private int downY;
  /**
   * 臨時儲存X座標
   */
  private int tempX;
  /**
   * 滑動類
   */
  private Scroller mScroller;
  /**
   * SildingFinishLayout的寬度
   */
  private int viewWidth;
  /**
   * 記錄是否正在滑動
   */
  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,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) {
// 獲取SildingFinishLayout所在佈局的父佈局
      mParentView = (ViewGroup) this.getParent();
      viewWidth = this.getWidth();
    }
  }


  /**
   * 設定OnSildingFinishListener,在onSildingFinish()方法中finish Activity
   *
   * @param onSildingFinishListener
   */
  public void setOnSildingFinishListener(
      OnSildingFinishListener onSildingFinishListener) {
    this.onSildingFinishListener = onSildingFinishListener;
  }


  /**
   * 設定Touch的View
   *
   * @param touchView
   */
  public void setTouchView(View touchView) {
    this.touchView = touchView;
    touchView.setOnTouchListener(this);
  }


  public View getTouchView() {
    return touchView;
  }


  /**
   * 滾動出界面
   */
  private void scrollRight() {
    final int delta = (viewWidth + mParentView.getScrollX());
// 呼叫startScroll方法來設定一些滾動的引數，我們在computeScroll()方法中呼叫scrollTo來滾動item
    mScroller.startScroll(mParentView.getScrollX(),-delta + 1,Math.abs(delta));
    postInvalidate();
  }


  /**
   * 滾動到起始位置
   */
  private void scrollOrigin() {
    int delta = mParentView.getScrollX();
    mScroller.startScroll(mParentView.getScrollX(),-delta,Math.abs(delta));
    postInvalidate();
  }


  /**
   * touch的View是否是AbsListView， 例如ListView,GridView等其子類
   *
   * @return
   */
  private boolean isTouchOnAbsListView() {
    return touchView instanceof AbsListView ? true : false;
  }


  /**
   * touch的view是否是ScrollView或者其子類
   *
   * @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，
// 則當手指滑動，取消item的點選事件，不然我們滑動也伴隨著item點選事件的發生
          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);


// 遮蔽在滑動過程中ListView ScrollView等自己的滑動事件
          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 我們處理完上面自己的邏輯之後
// 再交給AbsListView,ScrollView自己處理其自己的邏輯
    if (isTouchOnScrollView() || isTouchOnAbsListView()) {
      return v.onTouchEvent(event);
    }


// 其他的情況直接返回true
    return true;
  }


  @Override
  public void computeScroll() {
// 呼叫startScroll的時候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（）方法裡面

 @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);//繫結底層的佈局就可以了 :不起作用的話換個你activity 佈局裡面view就可以啦 
  }

截止目前，這個功能已經實現了

解決問題:這個會出現左滑背景白色問題

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 的屬性中加上

android:theme="@style/AppTheme"

3 一些屬性的詳解

<item name="android:windowFrame">@null</item> ：Dialog的windowFrame框為無
<item name="android:windowIsFloating">true</item>：是否浮現在activity之上
<item name="android:windowIsTranslucent">false</item>:是否半透明
<item name="android:windowNoTitle">true</item>:是否顯示title
<item name="android:windowBackground">@drawable/dia_bg</item>:設定dialog的背景
<item name="android:backgroundDimEnabled">false</item>: 背景是否透明顯示

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