Android開發之自定義帶邊框的TextView

自定義帶邊框的TextView

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

package cn.class3g.activity;

import Android.content.Context;

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、橫坐標0到this.getWidth()-1，縱坐標0到0

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

//2、橫坐標0到0，縱坐標0到this.getHeight()-1

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

//3、橫坐標this.getWidth()-1到this.getWidth()-1，縱坐標0到this.getHeight()-1

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

//4、橫坐標0到this.getWidth()-1，縱坐標this.getHeight()-1到this.getHeight()-1

//下面用圖介紹邊框的繪制

}

}

1

this.getWidth,this.getHeight

0,this.getHeight

this.getWidth()-1,0

0，0

3

4

2

然後只需要在布局裡調用這個就行

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<cn.class3g.activity.MyBorderTextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:padding="30dp"

android:text="hello"

android:textColor="#cccccc" >

</cn.class3g.activity.MyBorderTextView>

<TextView

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" >

</TextView>

</LinearLayout>

效果圖：