Android自定义SwipeLayout仿QQ侧滑条目

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public class MainActivity extends AppCompatActivity {

  private SwipeLayout mSwipeLayout;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    init();

  }

  private void init() {
    mSwipeLayout = (SwipeLayout) findViewById(R.id.swipelayout);
    mSwipeLayout.setOnClickListener(new SwipeLayout.OnClickListener() {
      @Override
      public void onClick(View view) {
        switch (view.getId()) {
          case R.id.back_left_tv_mark:
            toast("mark");
            break;
          case R.id.front_tv_content:
            toast("content");
            break;
          case R.id.back_right_tv_call:
            toast("call");
            break;
          case R.id.back_right_tv_delete:
            toast("delete");
            break;
        }
      }
    });
  }

  public void toast(String message) {
    Toast toast = Toast.makeText(this, "", Toast.LENGTH_SHORT);
    if (!TextUtils.isEmpty(message) && toast != null) {
      toast.setText(message);
      toast.show();
    }
  }
}

public class SwipeLayout extends FrameLayout {

  private View mBackLeftView;
  private ViewGroup mBackRightView;
  private View mFrontView;
  private int mWidth;
  private int mHeight;
  private int mLeftRange;
  private int mRightRange;
  private int status;
  public final int NORMAL = 0;//关闭状态
  public final int LEFT_OPEN = 1;//左边打开状态
  public final int RIGHT_OPEN = 2;//右边打开状态
  public final int LEFT_OPENING = 3;//左边正打开状态
  public final int LEFT_CLOSING = 4;//左边正关闭状态
  public final int RIGHT_OPENING = 5;//右边正打开状态
  public final int RIGHT_CLOSING = 6;//右边正关闭状态
  private ViewDragHelper mViewDrawHelper;
  private final int V = 300;//限制速度
  private OnSwipeListener mOnSwipeListener;
  private OnClickListener mOnClickListener;
  private View mBackRightCall;
  private View mBackRightDelete;
  private int x;
  private boolean isClick;
  private final int DX = 10;

  public interface OnSwipeListener {
    void onLeftOpen(SwipeLayout swipeLayout);

    void onLeftClose(SwipeLayout swipeLayout);

    void onRightOpen(SwipeLayout swipeLayout);

    void onRightClose(SwipeLayout swipeLayout);
  }

  public interface OnClickListener {
    void onClick(View view);
  }

  public SwipeLayout(Context context) {
    super(context);
    init();
  }

  public SwipeLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();

  }

  public SwipeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }

  @TargetApi(Build.VERSION_CODES.LOLLIPOP)
  public SwipeLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    init();
  }

  private void init() {
    status = NORMAL;//默认是NORMAL
    mViewDrawHelper = ViewDragHelper.create(this, callback);
  }

  public void setOnSwipeListener(OnSwipeListener mOnSwipeListener) {
    this.mOnSwipeListener= mOnSwipeListener;
  }

  public void setOnClickListener(OnClickListener mOnClickListener) {
    this.mOnClickListener= mOnClickListener;
  }

  private ViewDragHelper.Callback callback = new ViewDragHelper.Callback() {
    /**是否试图拖拽子view*/
    @Override
    public boolean tryCaptureView(View child, int pointerId) {
      if (child == mBackLeftView) {
        return false;
      }
      return true;
    }

    /** 水平方向上的限制*/
    @Override
    public int clampViewPositionHorizontal(View child, int left, int dx) {

      if (child == mFrontView) {
        if (left <-mRightRange) {
          left = -mRightRange;
        } else if (left > mLeftRange) {
          left = mLeftRange;
        }
      } else if (child == mBackRightView) {
        if (left  mWidth) {
          left = mWidth;
        }
      }
      return left;
    }

    /**这是系统定义的状态*/
    @Override
    public void onViewDragStateChanged(int state) {
      super.onViewDragStateChanged(state);

      if (state == ViewDragHelper.STATE_IDLE) {//ViewDrawHelper处于空闲状态

      } else if (state == ViewDragHelper.STATE_DRAGGING) {//ViewDrawHelper处于正在拖拽状态
        //拖拽状态，可设置滑动事件
      } else if (state == ViewDragHelper.STATE_SETTLING) {//ViewDrawHelper处于飞翔状态
        //飞翔状态设置，可设置滚动事件
      }
    }

    @Override
    public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
      super.onViewPositionChanged(changedView, left, top, dx, dy);

      if (mFrOntView== changedView) {
        mBackRightView.offsetLeftAndRight(dx);
      } else if (mBackRightView == changedView) {
        mFrontView.offsetLeftAndRight(dx);
      }

      status = updateStatus();//更新控件的状态

      invalidate();//重绘界面
    }

    @Override
    public void onViewReleased(View releasedChild, float xvel, float yvel) {
      super.onViewReleased(releasedChild, xvel, yvel);

      int left = mFrontView.getLeft();
      if (left <-mRightRange * 0.5f) {
        if (xvel > V) {
          normalClose();
        } else {
          rightOpen();
        }
      } else if (left >= -mRightRange * 0.5f && left <= 0) {
        if (xvel <-V) {//向左滑动
          rightOpen();//打开右边前布局
        } else {
          normalClose();
        }
      } else if (left > 0 && left <= mLeftRange * 0.5f) {
        if (xvel > V) {
          leftOpen();
        } else {
          normalClose();
        }
      } else if (left > mLeftRange * 0.5f && left <= mLeftRange) {
        if (xvel <-V) {//向左滑动
          normalClose();
        } else {
          leftOpen();
        }
      }
    }
  };

  public void dispatchClickListener() {
    //设置点击事件
    if (status == LEFT_OPEN) {
      //mark的点击事件和Content点击事件
      if (mOnClickListener != null) {
        if (x > 0 && x  mWidth - mRightRange && x = mWidth - mRightRange * 0.5f && x <= mWidth) {
          mOnClickListener.onClick(mBackRightDelete);
        }
      }
    } else if (status == NORMAL) {
      //content的点击事件
      if (mOnClickListener != null) {
        mOnClickListener.onClick(mFrontView);
      }
    }
  }

  private int updateStatus() {
    int left = mFrontView.getLeft();
    if (left == -mRightRange) {
      status = RIGHT_OPEN;
    } else if (left == 0) {
      status = NORMAL;
    } else if (left == mLeftRange) {
      status = LEFT_OPEN;
    }
    return status;
  }

  public void leftOpen() {
    leftOpen(true);
  }

  public void leftOpen(boolean isSmooth) {
    int finalLeft = mLeftRange;
    int finalTop = 0;
    if (isSmooth) {
      if (mViewDrawHelper.smoothSlideViewTo(mFrontView, finalLeft, finalTop)) {
        ViewCompat.postInvalidateOnAnimation(this);
      }
    } else {
      layoutContent(LEFT_OPEN);
    }
  }

  public void normalClose() {
    normalClose(true);
  }

  public void normalClose(boolean isSmooth) {
    int finalLeft = 0;
    int finalTop = 0;
    if (isSmooth) {
      if (mViewDrawHelper.smoothSlideViewTo(mFrontView, finalLeft, finalTop)) {
        ViewCompat.postInvalidateOnAnimation(this);
      }
    } else {
      layoutContent(NORMAL);
    }
  }

  public void rightOpen() {
    rightOpen(true);
  }

  public void rightOpen(boolean isSmooth) {
    int finalLeft = -mRightRange;
    int finalTop = 0;
    if (isSmooth) {
      if (mViewDrawHelper.smoothSlideViewTo(mFrontView, finalLeft, finalTop)) {
        ViewCompat.postInvalidateOnAnimation(this);
      }
    } else {
      layoutContent(RIGHT_OPEN);
    }
  }


  @Override
  public void computeScroll() {
    super.computeScroll();
    if (mViewDrawHelper.continueSettling(true)) {
      ViewCompat.postInvalidateOnAnimation(this);
    }
  }

  @Override
  public boolean onInterceptTouchEvent(MotionEvent ev) {
    return mViewDrawHelper.shouldInterceptTouchEvent(ev);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {

    dispatchOnTouchEvent(event);//分发触摸的事件

    try {
      mViewDrawHelper.processTouchEvent(event);//将触摸事件传递给ViewDrawHelper
    } catch (Exception e) {
    }
    return true;
  }

  public void dispatchOnTouchEvent(MotionEvent event) {
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
      x = (int) event.getX();
      isClick = true;
    } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
      int movex = (int) event.getX();
      if (Math.abs(movex - x) > DX) {//防止点击事件，会稍微手指抖动
        isClick = false;
      }
    } else if (event.getAction() == MotionEvent.ACTION_UP) {
      if (isClick) {
        dispatchClickListener();
      }
    }
  }

  @Override
  protected void onFinishInflate() {
    super.onFinishInflate();

    //获取控件中的子控件
    mBackLeftView = getChildAt(0);
    mBackRightView = (ViewGroup) getChildAt(1);
    mFrOntView= getChildAt(2);

    mBackRightCall = mBackRightView.getChildAt(0);
    mBackRightDelete = mBackRightView.getChildAt(1);
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    mWidth = getMeasuredWidth();
    mHeight = getMeasuredHeight();
    mLeftRange = mBackLeftView.getMeasuredWidth();
    mRightRange = mBackRightView.getMeasuredWidth();
  }

  @Override
  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    super.onLayout(changed, left, top, right, bottom);

    //摆放布局
    layoutContent(NORMAL);
  }

  public void layoutContent(int status) {
    Rect frOntRect= computeFrontRect(status);//根据状态，摆放前布局
    mFrontView.layout(frontRect.left, frontRect.top, frontRect.right, frontRect.bottom);

    Rect rightBackRect = computeRightBackRect(frontRect);//根据前布局，摆放右边后布局
    mBackRightView.layout(rightBackRect.left, rightBackRect.top, rightBackRect.right, rightBackRect.bottom);
  }

  public Rect computeFrontRect(int status) {
    int left = 0;
    int top = 0;
    if (status == LEFT_OPEN) {
      left = mLeftRange;
    } else if (status == RIGHT_OPEN) {
      left = -mRightRange;
    }
    return new Rect(left, top, left + mWidth, top + mHeight);
  }

  public Rect computeRightBackRect(Rect frontRect) {
    int left = 0;
    int top = 0;
    if (frontRect != null) {
      left = frontRect.right;
    }
    return new Rect(left, top, left + mRightRange, top + mHeight);
  }
}