自定义view实现侧滑菜单

自定义View

public class SlidingMenu extends HorizontalScrollView {
    private int mScreenWidth;
    private int mMenuRightPadding = 50; // dp
    private int mMenuWidth;
    private int mHalfMenuWidth;
    private boolean once;
    private boolean isOpen;
    public SlidingMenu(Context context, AttributeSet attrs) {
        super(context, attrs);
        mScreenWidth = Utils.getScreenWidth(context);
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (!once) {
            LinearLayout wrapper = (LinearLayout) getChildAt(0);
            ViewGroup menu = (ViewGroup) wrapper.getChildAt(0);
            ViewGroup content = (ViewGroup) wrapper.getChildAt(1);
            mMenuRightPadding = (int) Utils.dp2px(mMenuRightPadding, content);
            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) {
            // 隐藏菜单
            this.scrollTo(mMenuWidth, 0);
            once = true;
        }
    }
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        int action = ev.getAction();
        // 如果现实区域大于菜单一般，则显示，否则隐藏
        if (action == MotionEvent.ACTION_UP) {
            int scrollX = getScrollX();
            if (scrollX > mHalfMenuWidth) {
                this.smoothScrollTo(mMenuWidth, 0);
                isOpen = false;
            } else {
                this.smoothScrollTo(0, 0);
                isOpen = true;
            }
            return true;
        }
        return super.onTouchEvent(ev);
    }

    ///添加操作方法
    public void openMenu(){
        if(!isOpen){
            this.smoothScrollTo(0, 0);
            isOpen = true;
        }
    }
    public void closeMenu(){
        if(isOpen){
            this.smoothScrollTo(mMenuWidth, 0);
            isOpen = false;
        }
    }
    public void toggle(){
        if(isOpen){
            closeMenu();
        }else{
            openMenu();
        }
    }
}

布局文件中应用自定义View

<com.slide.SlidingMenu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/slide_menu"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:scrollbars="none" >
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="horizontal" >
        <include
            android:id="@+id/menu"
            layout="@layout/activity_main"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/main_bg"
            android:orientation="vertical" >
            <Button
                android:id="@+id/toggle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="弹出菜单"/>
        </LinearLayout>
    </LinearLayout>
</com.slide.SlidingMenu>