drawview.java

Google Android应用框架原理与程序设计 第三版(中文高清PDF)高焕堂

package com.misoo.ex12;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;

public class DrawView extends View {
    private Paint pa;
    Context ctx;
    public DrawView(Context context) {
        super(context);
        ctx = context;
        pa = new Paint();
     }
  @Override protected void onDraw(Canvas canvas) {
	     ex12 obj = (ex12)ctx;
         pa.setColor(obj.getColor());
	     canvas.drawRect(10, 10, 100, 100, pa);
	     pa.setColor(Color.GREEN);
	     pa.setStrokeWidth(4);
         pa.setStrokeCap(Paint.Cap.ROUND);
         canvas.drawLine(10, 55, 100, 55, pa);
         canvas.drawLine(55, 10, 55, 100, pa);
         pa.setColor(Color.RED);
    	 canvas.drawRect(50, 50, 60, 60, pa);
      }
 }