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android仿QQ的SlideMenu

2024-07-23 20:57:52   222人阅读



这其实很简单就可以实现,只需要自定义一个View继承自HorizontalScrollView

1,新建一个项目,再新建一个MySlideMenu继承HorizontalScrollView

public class MySlideMenu extends HorizontalScrollView {  //继承自横向可滚动ScrollView
    private int mScreenWidth;  //屏幕宽度
    private int mMenuRightPadding;  //菜单栏的右边距 
    
    //菜单栏的宽度
    private int mMenuWidth;
    private int mMenuHalfWidth;  //菜单栏的半边宽度
    
    private boolean isOpen;  //标志当前菜单栏是否打开
    
    private boolean isOnce;  //是否第一次打开
    
    private ViewGroup mContent;  //内容页面
    private ViewGroup mMenu;   //菜单页面
    
    
    
    public MySlideMenu(Context context, AttributeSet attrs){
        this(context, attrs, 0);
    }
    
    public MySlideMenu(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);
            if(attr==R.styleable.SlidingMenu_rightPadding){
                mMenuRightPadding = a.getDimensionPixelSize(attr,
                        (int) TypedValue.applyDimension(
                                TypedValue.COMPLEX_UNIT_DIP, 50f,
                                getResources().getDisplayMetrics()));// 默认为10DP
            }
        }
        a.recycle();
    }
    
    
    @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            if(!isOnce){  //只允许获得第一次的  测量结果
                LinearLayout ll=(LinearLayout) getChildAt(0);
                mMenu=(ViewGroup) ll.getChildAt(0);  //从线性布局中获得 Menu布局
                mContent=(ViewGroup) ll.getChildAt(1);
                
                mMenuWidth=mScreenWidth-mMenuRightPadding;
                mMenuHalfWidth=mMenuWidth/2;
                mMenu.getLayoutParams().width=mMenuWidth;
                mContent.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){
            this.scrollTo(mMenuWidth, 0);    //将菜单隐藏
            isOnce=true;
        }
    }
    
    //打开菜单
    public void openMenu(){
        if(isOpen){
            return;
        }
        this.scrollTo(0, 0);
        isOpen=true;
    }
    //关闭菜单
    public void closeMenu(){
        if(!isOpen){
            return;
        }
        this.scrollTo(mMenuWidth,0);
        isOpen=false;
    }
    //切换菜单开关状态
    public void toggle(){
        if(isOpen){
            closeMenu();
        }
        else{
            openMenu();
        }
    }
    
    //监听手势滑动  
    @Override
        public boolean onTouchEvent(MotionEvent ev) {
            
            switch (ev.getAction()) {
                case MotionEvent.ACTION_UP:
                    int scrollX=getScrollX(); //获取滑动的横坐标
                    if(scrollX>mMenuHalfWidth){   //判断 有没有滑倒一半的距离
                        this.smoothScrollTo(mMenuWidth, 0);  //隐藏
                        isOpen=false;
                    }
                    else{
                        this.smoothScrollTo(0, 0);//展开
                        isOpen=true;
                    }
                    return true;
            }
            return super.onTouchEvent(ev);
        }
    
    //监听滑动时   菜单视图 和 滑动视图出现相应的放大缩小的特效
    @Override
        protected void onScrollChanged(int l, int t, int oldl, int oldt) {
            super.onScrollChanged(l, t, oldl, oldt);
            float scale = l * 1.0f / mMenuWidth;
            float leftScale = 1 - 0.3f * scale;
            float rightScale = 0.8f + scale * 0.2f;
            
            ViewHelper.setScaleX(mMenu, leftScale);
            ViewHelper.setScaleY(mMenu, leftScale);
            ViewHelper.setAlpha(mMenu, 0.6f + 0.4f * (1 - scale));
            ViewHelper.setTranslationX(mMenu, mMenuWidth * scale * 0.7f);
            ViewHelper.setPivotX(mContent, 0);
            ViewHelper.setPivotY(mContent, mContent.getHeight() / 2);
            ViewHelper.setScaleX(mContent, rightScale);
            ViewHelper.setScaleY(mContent, rightScale);
        }    
}
这里面其实就是用到了一个横向的ScrollView,并且在滑动时加入了一些动画效果而已,但ViewHelper并不是andorid API提供的,而是需要下载nineoldandroids-2.4.0.jar包.

2,新建一个屏幕辅助类
/**
 * 获得屏幕相关的辅助类
 * 
 * @author zhy
 * 
 */
public class ScreenUtils
{
    private ScreenUtils()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }
    /**
     * 获得屏幕高度
     * 
     * @param context
     * @return
     */
    public static int getScreenWidth(Context context)
    {
        WindowManager wm = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }
    /**
     * 获得屏幕宽度
     * 
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context)
    {
        WindowManager wm = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }
    /**
     * 获得状???栏的高??
     * 
     * @param context
     * @return
     */
    public static int getStatusHeight(Context context)
    {
        int statusHeight = -1;
        try
        {
            Class<?> clazz = Class.forName("com.android.internal.R$dimen");
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height")
                    .get(object).toString());
            statusHeight = context.getResources().getDimensionPixelSize(height);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return statusHeight;
    }
    /**
     * 获取当前屏幕截图，包含状态栏
     * 
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithStatusBar(Activity activity)
    {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
        view.destroyDrawingCache();
        return bp;
    }
    /**
     * 获取当前屏幕截图，不包含状???栏
     * 
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithoutStatusBar(Activity activity)
    {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        Rect frame = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        int statusBarHeight = frame.top;
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
                - statusBarHeight);
        view.destroyDrawingCache();
        return bp;
    }
}

其实就用到了一个获取屏幕宽度的方法.

3.看看activity_main.xml
<com.example.mytest.MySlideMenu xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/id_menu"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:zhy="http://schemas.android.com/apk/res/com.example.mytest"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:background="@drawable/img_frame_background"
    android:scrollbars="none"
    zhy:rightPadding="100dp" >
    <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" >
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="toggleMenu"
                android:text="切换菜单" />
        </LinearLayout>
    </LinearLayout>
</com.example.mytest.MySlideMenu> 

xml视图中就包含了两个View,一个是Menu,一个是Content.

4,再看Menu视图
<?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"
    android:background="#0000" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:orientation="vertical" >
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
            <ImageView
                android:id="@+id/one"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="20dp"
                android:src="@drawable/img_1" />
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_toRightOf="@id/one"
                android:text="第1个Item"
                android:textColor="#f0f0f0"
                android:textSize="20sp" />
        </RelativeLayout>
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
            <ImageView
                android:id="@+id/two"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="20dp"
                android:src="@drawable/img_2" />
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_toRightOf="@id/two"
                android:text="第2个Item"
                android:textColor="#f0f0f0"
                android:textSize="20sp" />
        </RelativeLayout>
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
            <ImageView
                android:id="@+id/three"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="20dp"
                android:src="@drawable/img_3" />
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_toRightOf="@id/three"
                android:text="第3个Item"
                android:textColor="#f0f0f0"
                android:textSize="20sp" />
        </RelativeLayout>
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
            <ImageView
                android:id="@+id/four"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="20dp"
                android:src="@drawable/img_4" />
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_toRightOf="@id/four"
                android:text="第一个Item"
                android:textColor="#f0f0f0"
                android:textSize="20sp" />
        </RelativeLayout>
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
            <ImageView
                android:id="@+id/five"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="20dp"
                android:src="@drawable/img_5" />
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="20dp"
                android:layout_toRightOf="@id/five"
                android:text="第5个Item"
                android:textColor="#f0f0f0"
                android:textSize="20sp" />
        </RelativeLayout>
    </LinearLayout>
</RelativeLayout>

也就是一些简单的线性排列而已.

5,最后一步,打开MainActivity.java
public class MainActivity extends Activity
{
    private MySlideMenu mMenu;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        mMenu = (MySlideMenu) findViewById(R.id.id_menu);
    }
    public void toggleMenu(View view)
    {
        mMenu.toggle();
    }
}

如此,轻松实现QQ侧滑效果.
 










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android仿QQ的SlideMenu


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