Android给View画边框

1. 引言

 

    在Android中，为TextView组件画边框，效果图及实现如下。

 

2. 效果图

   

3. 功能实现

 

    (1) 自定义TextView实现：package com.focus.fishme;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.widget.TextView;public class FishMeTextView extends TextView {public FishMeTextView(Context context) {super(context);}@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); Paint paint = new Paint(); // 将边框设为黑色. paint.setColor(android.graphics.Color.RED); // 画TextView的4个边. canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint); canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint); canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint); canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1, this.getHeight() - 1, paint); }} 

 

    (2) 主Activity实现：package com.focus.fishme;import android.app.Activity;import android.os.Bundle;import android.widget.LinearLayout;public class BorderLineActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); FishMeTextView fishMeTextView = new FishMeTextView(this); fishMeTextView.setText("马英才"); fishMeTextView.setWidth(100); fishMeTextView.setHeight(100); LinearLayout main = (LinearLayout) findViewById(R.id.main); main.addView(fishMeTextView); } }