Android开发之自定义带边框的TextView

自定义带边框的TextView

///////////////////////Activity///////////////////////////////

package cn.class3g.activity;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.util.AttributeSet;

import android.widget.TextView;

public class MyBorderTextView extends TextView{

public MyBorderTextView(Context context, AttributeSet attrs) {

super(context, attrs);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

Paint paint = new Paint();

paint.setColor(android.graphics.Color.YELLOW);

canvas.drawLine(0, 0, this.getWidth()-1, 0, paint);

//1、横坐标0到this.getWidth()-1，纵坐标0到0

canvas.drawLine(0, 0, 0, this.getHeight()-1, paint);

//2、横坐标0到0，纵坐标0到this.getHeight()-1

canvas.drawLine(this.getWidth()-1, 0, this.getWidth()-1, this.getHeight()-1, paint);

//3、横坐标this.getWidth()-1到this.getWidth()-1，纵坐标0到this.getHeight()-1

canvas.drawLine(0, this.getHeight()-1, this.getWidth()-1, this.getHeight()-1, paint);

//4、横坐标0到this.getWidth()-1，纵坐标this.getHeight()-1到this.getHeight()-1

//下面用图介绍边框的绘制

}

}

然后只需要在布局里调用这个就行

< xml version="1.0" encoding="utf-8" >

"http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:padding="30dp"

android:text="hello"

android:textColor="#cccccc" >

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:padding="30dp"

android:text="hello hello hello hello"

android:background="@drawable/ic_launcher"

android:textColor="#cccccc" >

效果图：