java 画图 文字 描边_Android开发:文字描边

1.[代码][Java]代码

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;

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);

}

}