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); } }

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