自定义实现侧滑菜单功能

布局文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="qb.example.com.myslidingmenu.MainActivity">   <mycustom.MySlidingMenu       android:layout_width="match_parent"       android:layout_height="match_parent"       android:scrollbarThumbHorizontal="@android:color/transparent"      >       <LinearLayout           android:orientation="horizontal"           android:layout_width="match_parent"           android:layout_height="match_parent">           <RelativeLayout               android:background="#f00"               android:layout_width="match_parent"               android:layout_height="match_parent">               <ListView                   android:id="@+id/lv_left"                   android:layout_width="match_parent"                   android:layout_height="match_parent"></ListView>           </RelativeLayout>           <RelativeLayout               android:background="#0f0"               android:layout_width="match_parent"               android:layout_height="match_parent">               <ImageView                   android:id="@+id/iv"                   android:visibility="gone"                   android:background="@color/mytranslate"                   android:layout_width="match_parent"                   android:layout_height="match_parent" />               <ListView                   android:id="@+id/lv_right"                   android:layout_width="match_parent"                   android:layout_height="match_parent"></ListView>           </RelativeLayout>       </LinearLayout>   </mycustom.MySlidingMenu></RelativeLayout>

public class MySlidingMenu extends HorizontalScrollView implements View.OnTouchListener{    private int mScreenWidth;    private int mMenuRightPadding=40;    private int mMenuWidth;    private int mHalfMenuWidth;    private boolean once;    private boolean isOpenMenu=false;    private static final int SNAP_VELOCITY=200;    private VelocityTracker mVelocityTracker;    private float xDown,xMove,xUp;    private ImageView iv;    public MySlidingMenu(Context context) {        super(context);    }    public MySlidingMenu(Context context, AttributeSet attrs) {        super(context, attrs);        WindowManager manager= (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);        DisplayMetrics metrics=new DisplayMetrics();        manager.getDefaultDisplay().getMetrics(metrics);        mScreenWidth=metrics.widthPixels;        this.setOnTouchListener(this);    }    public MySlidingMenu(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @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);            iv= (ImageView) content.getChildAt(0);            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){            this.scrollTo(mMenuWidth,0);            once=true;        }    }    @Override    public boolean onTouchEvent(MotionEvent ev) {        int action=ev.getAction();        craeteVelocityTracker(ev);        switch (action){            case MotionEvent.ACTION_DOWN:                xDown=ev.getRawX();                Log.e("text","xDown==="+xDown);                break;            case MotionEvent.ACTION_MOVE:                xMove=getX();                break;            case MotionEvent.ACTION_UP:                xUp=ev.getRawX();                Log.e("text","xUp==="+xUp);                int scrollX=getScrollX();                Log.e("text","scrollX==="+scrollX);                if(isOpenMenu){                    Log.e("text","isOpenMenu==="+isOpenMenu);                    if(Math.abs(xDown-xUp)<40){                        return true;                    }                    if((xDown-xUp>mHalfMenuWidth)||(getScrollVelocity()>SNAP_VELOCITY)&&(xDown-xUp>0)){                        this.smoothScrollTo(mMenuWidth,0);                        Log.e("text","回到主页");                        iv.setVisibility(View.GONE);                        isOpenMenu=false;                    }else{                        Log.e("text","打开菜单");                        this.smoothScrollTo(0,0);                        iv.setVisibility(View.VISIBLE);                        isOpenMenu=true;                    }                }else{                    if(Math.abs(xDown-xUp)<40){                        return true;                    }                    if((xUp-xDown>mHalfMenuWidth)||(getScrollVelocity()>SNAP_VELOCITY)&&(xUp-xDown>0)){                        Log.e("text","打开菜单");                        this.smoothScrollTo(0,0);                        iv.setVisibility(View.VISIBLE);                        isOpenMenu=true;                    }else{                        Log.e("text","回到主页");                        this.smoothScrollTo(mMenuWidth,0);                        iv.setVisibility(View.GONE);                        isOpenMenu=false;                    }                }                recyclerVelocityTracker();                return  true;        }        return super.onTouchEvent(ev);    }    private void craeteVelocityTracker(MotionEvent event){        if(mVelocityTracker==null){            mVelocityTracker=VelocityTracker.obtain();        }        mVelocityTracker.addMovement(event);    }    private void recyclerVelocityTracker(){        mVelocityTracker.recycle();        mVelocityTracker=null;    }    private int getScrollVelocity(){        mVelocityTracker.computeCurrentVelocity(1000);        int velocity= (int) mVelocityTracker.getXVelocity();        return Math.abs(velocity);    }    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        int action=ev.getAction();        switch (action){            case MotionEvent.ACTION_DOWN:                xDown=ev.getRawX();                Log.e("text","onInterceptTouchEvent()==="+xDown);                break;            case MotionEvent.ACTION_MOVE:                xMove=ev.getRawX();//                if(isOpenMenu){//                    if(xMove-xDown>20){//                        return true;//                    }//                }else{//                    if(xMove-xUp>20){//                        return true;//                    }//                }                break;            case MotionEvent.ACTION_UP:                xUp=ev.getRawX();                Log.e("text","onInterceptTouchEvent()==="+xUp);                if(isOpenMenu){                    if(xUp>mMenuWidth){                        this.smoothScrollTo(mMenuWidth,0);                        iv.setVisibility(View.GONE);                        return true;                    }                    if(xUp-xDown>20){                        return true;                    }                }else{                    if(xDown-xUp>20){                        return true;                    }                }                break;        }        return super.onInterceptTouchEvent(ev);    }    public void openMenu(){        isOpenMenu=true;        this.scrollTo(0,0);    }    public void openContent(){        isOpenMenu=false;        this.scrollTo(mMenuWidth,0);    }    @Override    public boolean onTouch(View view, MotionEvent motionEvent) {        return false;    }}