Android使用自定义控件HorizontalScrollView打造史上最简单的侧滑菜单

<com.example.zhy_slidingmenu.SlidingMenu xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="wrap_content" 
android:layout_height="fill_parent" 
android:scrollbars="none" > 
<LinearLayout 
android:layout_width="wrap_content" 
android:layout_height="fill_parent" 
android:orientation="horizontal" > 
<include layout="@layout/layout_menu" /> 
<LinearLayout 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:background="@drawable/qq" > 
</LinearLayout> 
</LinearLayout> 
</com.example.zhy_slidingmenu.SlidingMenu> 

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); 
} 
}

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
<attr name="rightPadding" format="dimension" /> 
<declare-styleable name="SlidingMenu"> 
<attr name="rightPadding" /> 
</declare-styleable> 
</resources> 

<com.example.zhy_slidingmenu.SlidingMenu xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
xmlns:zhy="http://schemas.android.com/apk/res/com.example.zhy_slidingmenu" 
android:layout_width="wrap_content" 
android:layout_height="fill_parent" 
android:scrollbars="none" 
zhy:rightPadding="100dp" > 

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 < n; i++) 
{ 
int attr = a.getIndex(i); 
switch (attr) 
{ 
case R.styleable.SlidingMenu_rightPadding: 
// 默认50 
mMenuRightPadding = a.getDimensionPixelSize(attr, 
(int) TypedValue.applyDimension( 
TypedValue.COMPLEX_UNIT_DIP, 50f, 
getResources().getDisplayMetrics()));// 默认为10DP 
break; 
} 
} 
a.recycle(); 
}

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(); 
} 
}