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Android开发TextvView实现镂空字体效果示例代码

作者:cachelittlepeople

这篇文章主要介绍了Android开发TextvView实现镂空字体效果,本文通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

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();
 }
 
 /***
  * 初始化画笔属性
  */
 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

<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:id="@+id/hollowtext"
   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"/>

总结

到此这篇关于Android开发TextvView实现镂空字体效果示例代码的文章就介绍到这了,更多相关Android实现镂空字体内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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