Android实现QQ侧滑菜单效果

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package com.example.a1_;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.Scroller;

/**
 * Created by Administrator on 2017.05.29.0029.
 */

public class SlidingMenu extends RelativeLayout {

private float downX;
private int destance;
private int menuWidth;
private int endx;
private int dx;
private final Scroller scroller;
private float downY;
private int dy;

public SlidingMenu(Context context, AttributeSet attrs) {
  super(context, attrs);
  //创建Scroller对象
  scroller = new Scroller(context);
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
  //获取子控件
  View menu = getChildAt(0);
  View main = getChildAt(1);
  //获取菜单布局的宽度
  menuWidth = menu.getMeasuredWidth();
  //把菜单布局布置在屏幕左侧
  menu.layout(-menuWidth,t,0,b);
  //主页面使用默认的位置就可以
  main.layout(l,t,r,b);
}

//给布局添加一个touch事件

@Override
public boolean onTouchEvent(MotionEvent event) {
  switch (event.getAction()){
    case MotionEvent.ACTION_DOWN:
      //当手指按下时,记录一下手指的位置
      downX = event.getX();
      break;
    case MotionEvent.ACTION_MOVE:
      //当手指移动的时候,记录移动的距离
      destance = (int) (event.getX()- downX+endx);
      //对手指滑动的时候,页面移动做出限制
      if (destance>menuWidth){
        destance = menuWidth;
      }else if (destance<0){
        destance = 0;
      }
      scrollTo(-destance,0);
      break;
    case MotionEvent.ACTION_UP:
      //当手指离开屏幕的时候,记录菜单的位置,根据情况进行判定
      if (destanceMath.abs(dy)){
        //拦截move事件
        return true;
      }
      break;
  }
  return super.onInterceptTouchEvent(ev);
}

//判断当前的菜单状态是打开还是关闭的
public void switchMenu(){
  int startX = 0;
  if (endx == 0){
    endx = menuWidth;
  }else {
    endx = 0;
    startX = menuWidth;
  }
  //设置偏移量
  int dx = endx-startX;
  scroller.startScroll(startX,0,dx,0,Math.abs(dx)*10);
  invalidate();
}
}

package com.example.a1_;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

public class MainActivity extends AppCompatActivity {
private SlidingMenu slidingMenu;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  //初始化控件
  ImageButton imageButton = (ImageButton) findViewById(R.id.ib_back);
  slidingMenu = (SlidingMenu) findViewById(R.id.slidingmenu);

  //设置点击事件
  imageButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
      slidingMenu.switchMenu();
    }
  });
}
}