• Android 圆角ListView


    方法一:定义

    <?xml version ="1.0" encoding ="UTF-8" ?> 
    <shape xmlns:android ="http://schemas.android.com/apk/res/android" android:shape ="rectangle" > 
           <gradient android:startColor ="#B0BCCD" android:endColor ="#6D84A2" android:angle ="270" /> 
           <corners android:bottomRightRadius ="8dp" android:bottomLeftRadius ="8dp" android:topLeftRadius ="8dp"
                  android:topRightRadius ="8dp" /> 
    </shape>

    布局文件中的ListView属性android:listSelector="@drawable/shape"

    存在问题是,ListView最上面或者最下面的item选中时,圆角背景变成直角的

    方法二:修改选中item 

    public class RoundedRectListView extends ListView {   
            private Context mContext; 
            public RoundedRectListView( Context context) { 
                    super ( context) ;         
                    this .mContext = context; 
                    init( ) ; 
            } 
            public RoundedRectListView( Context context, AttributeSet attrs) { 
                    super ( context, attrs) ; 
                    this .mContext = context; 
                    init( ) ; 
            } 
            public RoundedRectListView( Context context, AttributeSet attrs, int defStyle) { 
                    super ( context, attrs, defStyle) ; 
                    this .mContext = context; 
                    init( ) ; 
            } 
            protected void init( ) { 
                    setBackgroundDrawable( mContext.getResources ( ) .getDrawable ( R.drawable .background_rounded_white ) ) ; 
                    setCacheColorHint( Color .WHITE ) ; 
                    setFooterDividersEnabled( false ) ; 
            } 
            @Override
            public boolean onInterceptTouchEvent( MotionEvent ev) { 
      
                    switch ( ev.getAction ( ) ) { 
                    case MotionEvent.ACTION_DOWN : 
                            int x = ( int ) ev.getX ( ) ; 
                            int y = ( int ) ev.getY ( ) ; 
                            int itemnum = pointToPosition( x, y) ; 
                            if ( itemnum == AdapterView.INVALID_POSITION ) 
                                    break ;                   
                            else
                            {  
                                    if ( itemnum== 0) { 
                                            if ( itemnum== ( getAdapter( ) .getCount ( ) - 1) ) 
                                                    setSelector( R.drawable .listview_selection_shade_rounded ) ; 
                                            else
                                                    setSelector( R.drawable .listview_selection_shade_top_rounded ) ; 
                                    } 
                                    else if ( itemnum== ( getAdapter( ) .getCount ( ) - 1) ) 
                                            setSelector( R.drawable .listview_selection_shade_bottom_rounded ) ; 
                                    else
                                            setSelector( R.drawable .listview_selection_shade ) ;                       
                            } 
                            break ; 
                    case MotionEvent.ACTION_UP : 
                            break ; 
                    } 
                    return true ;     
            }       
    }

    方法三:定义selector

    public class RoundedRectListView extends ListView {     
            private Context mContext; 
      
            public RoundedRectListView( Context context) { 
                    super ( context) ;         
                    this .mContext = context; 
                    init( ) ; 
            } 
            public RoundedRectListView( Context context, AttributeSet attrs) { 
                    super ( context, attrs) ; 
                    this .mContext = context; 
                    init( ) ; 
            } 
            public RoundedRectListView( Context context, AttributeSet attrs, int defStyle) { 
                    super ( context, attrs, defStyle) ; 
                    this .mContext = context; 
                    init( ) ; 
            } 
            protected void init( ) { 
                    setBackgroundDrawable( mContext.getResources ( ) .getDrawable ( R.drawable .background_rounded_white ) ) ; 
                    setCacheColorHint( Color .WHITE ) ; 
                    setFooterDividersEnabled( false ) ; 
            } 
            @Override
            public boolean onInterceptTouchEvent( MotionEvent ev) { 
      
                    switch ( ev.getAction ( ) ) { 
                    case MotionEvent.ACTION_DOWN : 
                            int x = ( int ) ev.getX ( ) ; 
                            int y = ( int ) ev.getY ( ) ; 
                            int itemnum = pointToPosition( x, y) ; 
      
                            if ( itemnum == AdapterView.INVALID_POSITION ) 
                                    break ;                   
                            else
                            {  
                                    if ( itemnum== 0) { 
                                            if ( itemnum== ( getAdapter( ) .getCount ( ) - 1) ) 
                                                    setSelector( R.drawable .listview_selection_shade_rounded ) ; 
                                            else
                                                    setSelector( R.drawable .listview_selection_shade_top_rounded ) ; 
                                    } 
                                    else if ( itemnum== ( getAdapter( ) .getCount ( ) - 1) ) 
                                            setSelector( R.drawable .listview_selection_shade_bottom_rounded ) ; 
                                    else
                                            setSelector( R.drawable .listview_selection_shade ) ;                       
                            } 
                            break ; 
                    case MotionEvent.ACTION_UP : 
                            break ; 
                    } 
                    return true ;     
            }       
    }

    方法四:方法二和方法三的结合

    public class RoundedRectListView extends ListView {   
     
            private Context mContext; 
      
            public RoundedRectListView( Context context) { 
                    super ( context) ;         
                    this .mContext = context; 
                    init( ) ; 
            } 
            public RoundedRectListView( Context context, AttributeSet attrs) { 
                    super ( context, attrs) ; 
                    this .mContext = context; 
                    init( ) ; 
            } 
            public RoundedRectListView( Context context, AttributeSet attrs, int defStyle) { 
                    super ( context, attrs, defStyle) ; 
                    this .mContext = context; 
                    init( ) ; 
            } 
           protected void init( ) { 
                    setBackgroundDrawable( mContext.getResources ( ) .getDrawable ( R.drawable .background_rounded_white ) ) ; 
                    setCacheColorHint( Color .WHITE ) ; 
                    setFooterDividersEnabled( false ) ;         
                    setSelector( new Selector( RoundedRectListView.this ,- 1) ) ; 
            } 
       @Override
            public boolean onInterceptTouchEvent( MotionEvent ev) { 
                    switch ( ev.getAction ( ) ) { 
                    case MotionEvent.ACTION_DOWN : 
                            int x = ( int ) ev.getX ( ) ; 
                            int y = ( int ) ev.getY ( ) ; 
                            int itemnum = pointToPosition( x, y) ; 
                            if ( itemnum == AdapterView.INVALID_POSITION ) 
                                    break ;                   
                            else
                            {               
                               setSelector( new Selector( RoundedRectListView.this ,itemnum) ) ;                 
                            } 
                            break ; 
                    case MotionEvent.ACTION_UP : 
                            break ; 
                    } 
                    return true ;     
            } 
        class Selector extends Drawable { 
            private static final String TAG = "Selector" ; 
            private Paint mPaint; 
            private AdapterView mList; 
            private RectF mRectF; 
            private int position; 
             
            public Selector( AdapterView list,int position) { 
                mList = list; 
                mPaint = new Paint ( ) ; 
                mRectF = new RectF( ) ; 
                this .position = position 
     
                LinearGradient g= new LinearGradient( mRectF.top ,mRectF.left ,mRectF.right ,mRectF.bottom ,Color .parseColor ( "#058cf5" ) ,Color .parseColor ( "#015fe6" ) ,TileMode.REPEAT ) ;   
     
        mPaint.setShader ( g) ; 
            } 
            @Override
            public void draw( Canvas canvas) { 
                Rect b = getBounds( ) ; 
                int mPosition = mList.getSelectedItemPosition ( ) ; 
                if ( mPosition==- 1) { 
                    mPosition= position; 
                } 
                Log.d ( TAG, "Position :" + mPosition) ; 
                canvas.save ( ) ; 
                canvas.clipRect ( b.left , b.top , b.right , ( b.bottom + b.top ) / 2) ; 
                drawHalf( canvas, b, mPosition == 0) ; 
                canvas.restore ( ) ; 
                canvas.save ( ) ; 
                canvas.clipRect ( b.left , ( b.bottom + b.top ) / 2, b.right , b.bottom ) ; 
                drawHalf( canvas, b, mPosition == mList.getAdapter ( ) .getCount ( ) - 1 && b.bottom == mList.getHeight ( ) ) ; 
                canvas.restore ( ) ; 
                Log.d ( TAG, "draw " + b) ; 
            } 
            private void drawHalf( Canvas canvas, Rect b ,boolean round) {           
                     
                if ( round) { 
                    mRectF.set ( b) ; 
                    canvas.drawRoundRect ( mRectF, 10, 10, mPaint) ;               
                } else { 
                    canvas.drawRect ( b, mPaint) ;               
                } 
            } 
            @Override
            public int getOpacity( ) { 
                return 0 ; 
            } 
            @Override
            public void setAlpha( int alpha) { 
            } 
            @Override
            public void setColorFilter( ColorFilter cf) { 
            } 
        } 
    }

    方法五:

    public class RoundedRectListView extends ListView { 
        private static final float RADIUS = 16 ; 
        private Path mClip; 
        public RoundedRectListView( Context context, AttributeSet attrs) { 
            super ( context, attrs) ; 
            init( ) ; 
        } 
        private void init( ) { 
            GradientDrawable gd = new GradientDrawable( ) ; 
            gd.setCornerRadius ( RADIUS) ; 
            gd.setColor ( 0xff208020) ; 
            setBackgroundDrawable( gd) ; 
            setCacheColorHint( 0) ; 
            setVerticalFadingEdgeEnabled( false ) ; 
            StateListDrawable sld = new StateListDrawable( ) ; 
            sld.addState ( 
                    PRESSED_ENABLED_STATE_SET, 
                    new GradientDrawable( Orientation.LEFT_RIGHT , new int [ ] { 0xffa58cf5, 0xffa13f99} ) ) ; 
            sld.addState ( 
                    EMPTY_STATE_SET,
                    new GradientDrawable( Orientation.LEFT_RIGHT , new int [ ] { 0xff058cf5, 0xff013f99} ) ) ; 
            setSelector( sld) ; 
        } 
        @Override
        protected void onSizeChanged( int w, int h, int oldw, int oldh) { 
            super .onSizeChanged ( w, h, oldw, oldh) ; 
            mClip = new Path( ) ; 
            RectF rect = new RectF( 0, 0, w, h) ; 
            mClip.addRoundRect ( rect, RADIUS, RADIUS, Direction.CW ) ; 
        } 
       @Override
        protected void dispatchDraw( Canvas canvas) { 
            canvas.save ( ) ; 
            canvas.clipPath ( mClip) ; 
            super .dispatchDraw ( canvas) ; 
            canvas.restore ( ) ; 
        } 
    }

    第五种方法最好

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  • 原文地址:https://www.cnblogs.com/zhujiabin/p/6062470.html
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