Android开发TextvView实现镂空字体效果示例代码

Android镂空字体的实现效果图，感兴趣的朋友可以参考实现代码。

效果图：

记录一下...

自定义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();
 }
 
 
 private void initPaint() {
  //画文字的paint
  mTextPaint = new Paint();
  //这是镂空的关键
  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) {
  //这里给super传入的是mTextCanvas，把一些基本属性都支持进去
  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

xml中使用

总结

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