Android 圆角ListView

技术2024-10-10 59

网络方法摘抄：

方法一：定义

<?xml version ="1.0" encoding ="UTF-8" ?>

<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

方法三：定义selector

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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