Android自定义控件简单实现侧滑菜单效果

package com.example.zhy_slidingmenu;

import android.content.Context;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;

import com.zhy.utils.ScreenUtils;

public class SlidingMenu extends HorizontalScrollView
{
 /**
 * 屏幕宽度
 */
 private int mScreenWidth;
 /**
 * dp
 */
 private int mMenuRightPadding = 50;
 /**
 * 菜单的宽度
 */
 private int mMenuWidth;
 private int mHalfMenuWidth;

 private boolean once;

 public SlidingMenu(Context context, AttributeSet attrs)
 {
 super(context, attrs);
 mScreenWidth = ScreenUtils.getScreenWidth(context);
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
 {
 /**
 * 显示的设置一个宽度
 */
 if (!once)
 {
 LinearLayout wrapper = (LinearLayout) getChildAt(0);
 ViewGroup menu = (ViewGroup) wrapper.getChildAt(0);
 ViewGroup cOntent= (ViewGroup) wrapper.getChildAt(1);
 // dp to px
 mMenuRightPadding = (int) TypedValue.applyDimension(
  TypedValue.COMPLEX_UNIT_DIP, mMenuRightPadding, content
  .getResources().getDisplayMetrics());

 mMenuWidth = mScreenWidth - mMenuRightPadding;
 mHalfMenuWidth = mMenuWidth / 2;
 menu.getLayoutParams().width = mMenuWidth;
 content.getLayoutParams().width = mScreenWidth;

 }
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);

 }

 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b)
 {
 super.onLayout(changed, l, t, r, b);
 if (changed)
 {
 // 将菜单隐藏
 this.scrollTo(mMenuWidth, 0);
 Once= true;
 }
 }

 @Override
 public boolean onTouchEvent(MotionEvent ev)
 {
 int action = ev.getAction();
 switch (action)
 {
 // Up时，进行判断，如果显示区域大于菜单宽度一半则完全显示，否则隐藏
 case MotionEvent.ACTION_UP:
 int scrollX = getScrollX();
 if (scrollX > mHalfMenuWidth)
 this.smoothScrollTo(mMenuWidth, 0);
 else
 this.smoothScrollTo(0, 0);
 return true;
 }
 return super.onTouchEvent(ev);
 }

}

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>


 

 
  
 

public SlidingMenu(Context context, AttributeSet attrs, int defStyle)
 {
 super(context, attrs, defStyle);
 mScreenWidth = ScreenUtils.getScreenWidth(context);

 TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
 R.styleable.SlidingMenu, defStyle, 0);
 int n = a.getIndexCount();
 for (int i = 0; i 

case MotionEvent.ACTION_UP:
 int scrollX = getScrollX();
 if (scrollX > mHalfMenuWidth)
 {
 this.smoothScrollTo(mMenuWidth, 0);
 isOpen = false;
 } else
 {
 this.smoothScrollTo(0, 0);
 isOpen = true;
 }
 return true;
 }

/**
 * 打开菜单
 */
 public void openMenu()
 {
 if (isOpen)
 return;
 this.smoothScrollTo(0, 0);
 isOpen = true;
 }

 /**
 * 关闭菜单
 */
 public void closeMenu()
 {
 if (isOpen)
 {
 this.smoothScrollTo(mMenuWidth, 0);
 isOpen = false;
 }
 }

 /**
 * 切换菜单状态
 */
 public void toggle()
 {
 if (isOpen)
 {
 closeMenu();
 } else
 {
 openMenu();
 }
 }

public class MainActivity extends Activity
{
 private SlidingMenu mMenu ;

 @Override
 protected void onCreate(Bundle savedInstanceState)
 {
 super.onCreate(savedInstanceState);
 requestWindowFeature(Window.FEATURE_NO_TITLE);
 setContentView(R.layout.activity_main);
 mMenu = (SlidingMenu) findViewById(R.id.id_menu);
 }
 
 public void toggleMenu(View view)
 {
 mMenu.toggle();
 }
}