Android开发:文字描边

[1].[代码] [Java]代码 跳至[1][2] [3]

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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 extendsTextView {

 

    privateTextView borderText = null;///用于描边的TextView

 

    publicStrokeTextView(Context context) {

        super(context);

        borderText =new TextView(context);

        init();

    }

 

    publicStrokeTextView(Context context, AttributeSet attrs) {

        super(context, attrs);

        borderText =new TextView(context,attrs);

        init();

    }

 

    publicStrokeTextView(Context context, AttributeSet attrs,

            intdefStyle) {

        super(context, attrs, defStyle);

        borderText =new TextView(context,attrs,defStyle);

        init();

    }

 

    publicvoid 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

    publicvoid setLayoutParams (ViewGroup.LayoutParams params){

        super.setLayoutParams(params);

        borderText.setLayoutParams(params);

    }

 

    @Override

    protectedvoid onMeasure(intwidthMeasureSpec, intheightMeasureSpec) {

        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);

    }

 

    protectedvoid onLayout (booleanchanged, int left, int top, int right, intbottom){

        super.onLayout(changed, left, top, right, bottom);

        borderText.layout(left, top, right, bottom);

    }

 

    @Override

    protectedvoid onDraw(Canvas canvas) {

        borderText.draw(canvas);

        super.onDraw(canvas);

    }

 

}

[2].[代码] [XML]代码 跳至[1][2] [3]

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<?xmlversion="1.0"encoding="utf-8"?>

<resources>

    <colorname="border_text">#ffffff</color>

</resources>

[3].[图片] miao_bian.png跳至 [1] [2] [3]