自定义HorizontalScrollView实现侧滑菜单

下图是工程目录结构：

MainActivity代码如下：

package com.example.tommy_qq_50;import com.example.tommy_qq_50.view.SlidingMenu;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.Window;public class MainActivity extends Activity {private SlidingMenu menu = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);menu = (SlidingMenu) findViewById(R.id.menu);}public void toggleMenu(View v){menu.toggle();}}

通过自定义类SlidingMenu继承自HorizontalScrollView，可以比较方便的实现侧滑的效果。而不是通过自定义ViewGroup来实现，因为这样需要考虑的TouchEvent会更多。

这里有对setTranslationX()函数的详解： http://blog.csdn.net/yanzi1225627/article/details/47850471

以下是自定义HorizontalScrollView的代码。

package com.example.tommy_qq_50.view;import com.example.tommy_qq_50.R;import com.nineoldandroids.view.ViewHelper;import android.content.Context;import android.content.res.TypedArray;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 SlidingMenu extends HorizontalScrollView {private  LinearLayout mWapper;private ViewGroup mMenu;private ViewGroup mContent;private int  mScreenWidth ;private int mMenuWidth;//单位dp,菜单与private int mMenuRightPadding = 50;private boolean once = false;private boolean isOpen = false;/** * 当使用了自定义属性时，会调用此构造方法 * @param context * @param attrs * @param defStyleAttr */public SlidingMenu(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);//获取我们定义的属性TypedArray a = context.getTheme().obtainStyledAttributes(attrs,R.styleable.SlidingMenu,defStyleAttr,0);int n =  a.getIndexCount();for(int i =0;i<n;i++){int attr = a.getIndex(i);switch (attr) {case R.styleable.SlidingMenu_rightPadding:mMenuRightPadding = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50,context.getResources().getDisplayMetrics()));break;default:break;}}a.recycle();WindowManager wm= (WindowManager) context.getSystemService(context.WINDOW_SERVICE);DisplayMetrics outMetrics = new DisplayMetrics();wm.getDefaultDisplay().getMetrics(outMetrics);mScreenWidth = outMetrics.widthPixels;}/** * 未使用自定义属性时，会调用此构造方法 * @param context * @param attrs */public SlidingMenu(Context context, AttributeSet attrs) {this(context, attrs,0);}public SlidingMenu(Context context) {this(context,null);}/** * 设置子View的宽和高 * 设置自己的宽和高 */@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {if(once == false){mWapper = (LinearLayout) getChildAt(0);mMenu =  (ViewGroup) mWapper.getChildAt(0);mContent =(ViewGroup) mWapper.getChildAt(1);mMenuWidth = mMenu.getLayoutParams().width = mScreenWidth - mMenuRightPadding;mContent.getLayoutParams().width = mScreenWidth;once = true;}super.onMeasure(widthMeasureSpec, heightMeasureSpec);}//设置子View放置的位置//通过设置偏移量，将Menu隐藏@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {// TODO Auto-generated method stubsuper.onLayout(changed, l, t, r, b);if(changed){this.scrollTo(mMenuWidth, 0);}}@Overridepublic boolean onTouchEvent(MotionEvent ev) {int action = ev.getAction();switch (action) {case MotionEvent.ACTION_UP://用户手指抬起时//隐藏在左边的宽度int scrollX = (int) getScrollX();if(scrollX >= mMenuWidth/2){this.smoothScrollTo(mMenuWidth, 0);isOpen = false;}else {this.smoothScrollTo(0, 0);isOpen = true;}return true;}return super.onTouchEvent(ev);}/** * 打开菜单 */public void openMenu(){if(isOpen)return ;else{this.smoothScrollTo(0, 0);isOpen = true;}}/** * 关闭菜单 */public void closeMenu(){if(!isOpen){return ;}else {this.smoothScrollTo(mMenuWidth, 0);isOpen = false;}}/** * 切换菜单 */public void toggle(){if(isOpen){closeMenu();}else{openMenu();}}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {super.onScrollChanged(l, t, oldl, oldt);float scale = l * 1.0f / mMenuWidth;//1~0/** * 区别一：内容区域从1.0-0.7 缩放的效果scale：1.0 - 0.00.7 + 0.3 * scale区别二：菜单的偏移量要修改区别三：菜单的显示时有缩放，以及透明度变化。缩放：0.7 - 1.01.0 - scale * 0.3 透明度：0.6 - 1.00.6 + 0.4 * （1 - scale）； */float rightScale = (0.7f + 0.3f * scale);float leftScale = 1.0f - scale * 0.3f;float leftAlpha = 0.6f + 0.4f * (1 - scale);//调用属性动画，设置TranslationXViewHelper.setTranslationX(mMenu, mMenuWidth * scale * 0.7f);ViewHelper.setScaleX(mMenu, leftScale);ViewHelper.setScaleY(mMenu, leftScale);ViewHelper.setAlpha(mMenu, leftAlpha);//设置mContent缩放的中心点ViewHelper.setPivotX(mContent, 0);ViewHelper.setPivotY(mContent, mContent.getHeight()/2);ViewHelper.setScaleX(mContent,  rightScale);ViewHelper.setScaleY(mContent, rightScale);}}

工程中一共有两个XML布局文件
1、activity_main.xml

2、left_menu.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    xmlns:tommy="http://schemas.android.com/apk/res/com.example.tommy_qq_50"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/img_frame_background"    ><com.example.tommy_qq_50.view.SlidingMenu     android:id="@+id/menu"    android:layout_width="match_parent"    android:layout_height="match_parent"    tommy:rightPadding="50dp"    >    <LinearLayout         android:layout_width="wrap_content"        android:layout_height="match_parent"        android:orientation="horizontal"        >        <include             layout="@layout/left_menu"            />        <LinearLayout             android:layout_width="match_parent"            android:layout_height="match_parent"            android:background="@drawable/qq"            >            <Button                 android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:onClick="toggleMenu"                android:text="切换菜单"                />        </LinearLayout>    </LinearLayout></com.example.tommy_qq_50.view.SlidingMenu>   </RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"        >    <LinearLayout         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:orientation="vertical"        ><RelativeLayout     android:layout_width="match_parent"    android:layout_height="wrap_content"    >    <ImageView        android:id="@+id/id_img1"         android:layout_width="50dp"        android:layout_height="50dp"      android:layout_marginLeft="20dp"      android:layout_marginTop="20dp"      android:src="@drawable/img_1"      android:layout_centerVertical="true"        />    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20sp"        android:textColor="#ffffff"        android:text="第一个Item"        android:layout_toRightOf="@id/id_img1"        android:layout_marginLeft="20dp"        android:layout_centerVertical="true"                /></RelativeLayout><RelativeLayout     android:layout_width="match_parent"    android:layout_height="wrap_content"    >    <ImageView        android:id="@+id/id_img2"         android:layout_width="50dp"        android:layout_height="50dp"      android:layout_marginLeft="20dp"      android:layout_marginTop="20dp"      android:src="@drawable/img_2"      android:layout_centerVertical="true"        />    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20sp"        android:textColor="#ffffff"        android:text="第二个Item"        android:layout_toRightOf="@id/id_img2"        android:layout_marginLeft="20dp"        android:layout_centerVertical="true"                /></RelativeLayout><RelativeLayout     android:layout_width="match_parent"    android:layout_height="wrap_content"    >    <ImageView        android:id="@+id/id_img3"         android:layout_width="50dp"        android:layout_height="50dp"      android:layout_marginLeft="20dp"      android:layout_marginTop="20dp"      android:src="@drawable/img_3"      android:layout_centerVertical="true"        />    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20sp"        android:textColor="#ffffff"        android:text="第三个Item"        android:layout_toRightOf="@id/id_img3"        android:layout_marginLeft="20dp"        android:layout_centerVertical="true"                /></RelativeLayout><RelativeLayout     android:layout_width="match_parent"    android:layout_height="wrap_content"    >    <ImageView        android:id="@+id/id_img4"         android:layout_width="50dp"        android:layout_height="50dp"      android:layout_marginLeft="20dp"      android:layout_marginTop="20dp"      android:src="@drawable/img_4"      android:layout_centerVertical="true"        />    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20sp"        android:textColor="#ffffff"        android:text="第四个Item"        android:layout_toRightOf="@id/id_img4"        android:layout_marginLeft="20dp"        android:layout_centerVertical="true"                /></RelativeLayout><RelativeLayout     android:layout_width="match_parent"    android:layout_height="wrap_content"    >    <ImageView        android:id="@+id/id_img5"         android:layout_width="50dp"        android:layout_height="50dp"      android:layout_marginLeft="20dp"      android:layout_marginTop="20dp"      android:src="@drawable/img_5"      android:layout_centerVertical="true"        />    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20sp"        android:textColor="#ffffff"        android:text="第五个Item"        android:layout_toRightOf="@id/id_img5"        android:layout_marginLeft="20dp"        android:layout_centerVertical="true"                /></RelativeLayout>    </LinearLayout></RelativeLayout>

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