Android自定义HorizontalScrollView实现qq侧滑菜单

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@Override 
protected void onLayout(boolean changed, int l, int t, int r, int b) { 
 // TODO Auto-generated method stub 
 super.onLayout(changed, l, t, r, b); 
} 

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
 // TODO Auto-generated method stub 
 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
} 

package com.example.myhorizontalscrollview; 
import android.annotation.SuppressLint; 
import android.content.Context; 
import android.text.GetChars; 
import android.util.AttributeSet; 
import android.util.DisplayMetrics; 
import android.util.TypedValue; 
import android.view.MotionEvent; 
import android.view.ViewGroup; 
import android.view.WindowManager; 
import android.widget.HorizontalScrollView; 
import android.widget.LinearLayout; 
public class MyHorizontalScrollView extends HorizontalScrollView { 
 //滚动条中的水平先行布局 
 private LinearLayout mWrpper; 
 //水平线性布局的左侧菜单menu 
 private ViewGroup mMenu; 
 //水平先行布局的右侧线性布局 
 private ViewGroup mContent; 
 //屏幕的宽 
 private int mScreenWidth; 
 //menu的宽离屏幕右侧的距离 
 private int mMenuRightPadding=50; 
 //menu的宽度 
 private int mMenuWidth; 
 private boolean once; 

 /** 
 * 未使用自定义属性时调用 
 * */ 
 public MyHorizontalScrollView(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 /* 
 * 获取屏幕的宽度 
 * 通过context拿到windowManager，在通过windowManager拿到Metrics,用DisplayMetrics接收 
 * */ 
 WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); 
 DisplayMetrics outMetrics = new DisplayMetrics(); 
 wm.getDefaultDisplay().getMetrics(outMetrics); 
 mScreenWidth=outMetrics.widthPixels; 
 //把dp转换成px 
 mMenuRightPadding=(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, 
 context.getResources().getDisplayMetrics()); 
 } 
 /* 
 * 设置子view的宽和高 
 * */ 
 @Override 
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
 // TODO Auto-generated method stub 
 if(!once){ 
 mWrpper=(LinearLayout) getChildAt(0); 
 mMenu=(ViewGroup) mWrpper.getChildAt(0); 
 mCOntent=(ViewGroup) mWrpper.getChildAt(1); 
 //menu的宽度等于屏幕的宽度减去menu离屏幕右侧的边距 
 mMenuWidth=mMenu.getLayoutParams().width=mScreenWidth-mMenuRightPadding; 
 //右边的先行布局的宽度直接等于屏幕的宽度 
 mContent.getLayoutParams().width=mScreenWidth; 
 Once=true; 
 } 
 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
 } 
 /* 
 * 通过设置偏移量将menu隐藏 
 * */ 
 @Override 
 protected void onLayout(boolean changed, int l, int t, int r, int b) { 
 // TODO Auto-generated method stub 
 super.onLayout(changed, l, t, r, b); 
 /* 
 * 通过scrollTo（x,y）方法设置屏幕的偏移量，x为正 
 * 内容向左移动 
 * */ 
 if(changed){ 
 this.scrollTo(mMenuWidth, 0); 
 } 
 } 
 /* 
 * 因为HorizontalScrollView自己控制move和down的事件 
 * 所以我们还要判断一下up.如果当前的x偏移量大于menu宽度的一半 
 * 隐藏menu，否则显示menu 
 * */ 
 @Override 
 public boolean onTouchEvent(MotionEvent ev) { 
 // TODO Auto-generated method stub 
 int action=ev.getAction(); 
 switch(action){ 
 case MotionEvent.ACTION_UP: 
 int scrollX=getScrollX(); 
 if(scrollX>=mMenuWidth/2){ 
 this.smoothScrollTo(mMenuWidth, 0); 
 } 
 else{ 
 this.smoothScrollTo(0, 0); 
 } 
 return true; 
 } 
 return super.onTouchEvent(ev); 
 } 
} 

package com.example.slipping; 
import com.example.helloworld.R; 
import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
public class MainActivity extends Activity { 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 } 
}