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自定義TextView

public class HollowTextView extends AppCompatTextView { private Paint mTextPaint, mBackgroundPaint; private Bitmap mBackgroundBitmap,mTextBitmap; private Canvas mBackgroundCanvas,mTextCanvas; private RectF mBackgroundRect; private int mBackgroundColor; private float mCornerRadius; public HollowTextView(Context context) { this(context,null); } public HollowTextView(Context context, AttributeSet attrs) { super(context, attrs); initAttrs(attrs,0); initPaint(); } public HollowTextView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initAttrs(attrs,defStyleAttr); initPaint(); } private void initAttrs(AttributeSet attrs,int defStyleAttr){ if(attrs == null){ return; } TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.HollowTextView, defStyleAttr, 0); mBackgroundColor = typedArray.getColor(R.styleable.HollowTextView_hollowTextView_background_color, Color.TRANSPARENT); mCornerRadius = typedArray.getDimension(R.styleable.HollowTextView_hollowTextView_corner_radius,0); typedArray.recycle(); } /*** * 初始化畫筆屬性 */ private void initPaint() { //畫文字的paint mTextPaint = new Paint(); //這是鏤空的關鍵 mTextPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); mTextPaint.setAntiAlias(true); mBackgroundPaint = new Paint(); mBackgroundPaint.setColor(mBackgroundColor); mBackgroundPaint.setAntiAlias(true); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mBackgroundBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_4444); mBackgroundCanvas = new Canvas(mBackgroundBitmap); mTextBitmap = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_4444); mTextCanvas = new Canvas(mTextBitmap); mBackgroundRect = new RectF(0,0,getWidth(),getHeight()); } @Override protected void onDraw(Canvas canvas) { //這里給super傳入的是mTextCanvas，把一些基本屬性都支持進去 super.onDraw(mTextCanvas); drawBackground(mBackgroundCanvas); int sc; if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ){ sc = canvas.saveLayer(0,0,getMeasuredWidth(),getMeasuredHeight(),null); }else { sc = canvas.saveLayer(0,0,getMeasuredWidth(),getMeasuredHeight(),null,Canvas.ALL_SAVE_FLAG); } canvas.drawBitmap(mBackgroundBitmap,0,0,null); canvas.drawBitmap(mTextBitmap, 0, 0, mTextPaint); canvas.restoreToCount(sc); } private void drawBackground(Canvas canvas){ if(mCornerRadius > 0){ canvas.drawRoundRect(mBackgroundRect,mCornerRadius,mCornerRadius, mBackgroundPaint); }else { canvas.drawColor(mBackgroundColor); } }

attr.xml文件

<declare-styleable name='HollowTextView'> <attr name='hollowTextView_background_color' format='color|reference'/> <attr name='hollowTextView_corner_radius' format='dimension|reference'/> </declare-styleable>

xml中使用

<com.cn.util.HollowTextView android: android:layout_width='60dp' android:layout_height='50dp' android:gravity='center' android:text='99+' android:textSize='30sp' android:textStyle='bold' app:hollowTextView_background_color='@color/white' app:hollowTextView_corner_radius='5dp' android:layout_centerInParent='true'/>

總結

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