文字描边代码,Java代码库,德仔网

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【Java】文字描边
作者:wkt / 发布于2014/7/17/ 537

	package com.example.testproject;
	
	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.Paint.Style;
	import android.text.TextPaint;
	import android.util.AttributeSet;
	import android.view.ViewGroup;
	import android.widget.TextView;
	/*
	* StrokeTextView的目标是给文字描边
	* 实现方法是两个TextView叠加,只有描边的TextView为底,实体TextView叠加在上面
	* 看上去文字就有个不同颜色的边框了
	*/
	public class StrokeTextView extends TextView {
	
	 private TextView borderText = null;///用于描边的TextView
	
	 public StrokeTextView(Context context) {
	 super(context);
	 borderText = new TextView(context);
	 init();
	 }
	
	 public StrokeTextView(Context context, AttributeSet attrs) {
	 super(context, attrs);
	 borderText = new TextView(context,attrs);
	 init();
	 }
	
	 public StrokeTextView(Context context, AttributeSet attrs,
	 int defStyle) {
	 super(context, attrs, defStyle);
	 borderText = new TextView(context,attrs,defStyle);
	 init();
	 }
	
	 public void init(){
	 TextPaint tp1 = borderText.getPaint();
	 tp1.setStrokeWidth(4); //设置描边宽度
	 tp1.setStyle(Style.STROKE); //对文字只描边
	 borderText.setTextColor(getResources().getColor(R.color.border_text)); //设置描边颜色
	 borderText.setGravity(getGravity());
	 }
	
	 @Override
	 public void setLayoutParams (ViewGroup.LayoutParams params){
	 super.setLayoutParams(params);
	 borderText.setLayoutParams(params);
	 }
	
	 @Override
	 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	 CharSequence tt = borderText.getText();
	
	 //两个TextView上的文字必须一致
	 if(tt== null || !tt.equals(this.getText())){
	 borderText.setText(getText());
	 this.postInvalidate();
	 }
	 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	 borderText.measure(widthMeasureSpec, heightMeasureSpec);
	 }
	
	 protected void onLayout (boolean changed, int left, int top, int right, int bottom){
	 super.onLayout(changed, left, top, right, bottom);
	 borderText.layout(left, top, right, bottom);
	 }
	
	 @Override
	 protected void onDraw(Canvas canvas) {
	 borderText.draw(canvas);
	 super.onDraw(canvas);
	 }
	
	}

	

	<?xml version="1.0" encoding="utf-8"?>
	<resources>
	 <color name="border_text" >#ffffff</color>
	</resources>
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