自定义View

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public class MainActivity extends Activity{
   EditText banjing,kuandu,color;
   Button but;
   MyView myView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       init();
   }

   private void init() {
       //找对象
       banjing = (EditText) findViewById(R.id.banjing);
       kuandu = (EditText) findViewById(R.id.kuandu);
       color = (EditText) findViewById(R.id.color);
       but = (Button) findViewById(R.id.but);
       myView = (MyView) findViewById(R.id.myview);
       //给按钮添加监听
       but.setOnClickListener(new OnClickListener() {
           @Override
           public void onClick(View v) {
               //得到文本框中的值，并转化成int类型
               int banjing1 = Integer.parseInt(banjing.getText().toString());
               int kuandu1 = Integer.parseInt(kuandu.getText().toString());
               int color1 = Integer.parseInt(color.getText().toString());
               //调用MyView中的方法，把值传递过去
               myView.set(banjing1, kuandu1, color1);
           }
       });
   }

}

View类

public class MyView extends View {
   Paint paint;
   public static int banjing,kuandu,color;
   //重写构造方法
   public MyView(Context context) {
       this(context, null, 0);
   }
   public MyView(Context context, AttributeSet attrs) {
       this(context, attrs, 0);
   }
   public MyView(Context context, AttributeSet attrs, int defStyle) {
       super(context, attrs, defStyle);
   }
   @Override
   protected void onDraw(Canvas canvas) {
       // TODO Auto-generated method stub
       super.onDraw(canvas);
       //设置画笔的完成和宽度还有样式
       paint = new Paint();
       paint.setColor(color);
       paint.setStrokeWidth(kuandu);
       paint.setAntiAlias(true);
       paint.setStyle(Style.STROKE);
       //画圆
       canvas.drawCircle(100, 200,banjing, paint);
   }
   //接受传递过来的产生，并重新绘制圆的方法
   public void set(int banjing,int kuandu,int color){
       this.banjing = banjing;
       this.kuandu = kuandu;
       this.color = color;
       invalidate();
   }
}

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