1.怎样设置代码
package com.example.rk1130;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
/*
自定义view
*/
public class BallView extends View {
private String ball_size;
private float tx=200f;
private float ty=200f;
private Paint paint;
public BallView(Context context) {
super(context);
init();
}
public BallView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public BallView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init(){
//设置画笔
paint = new Paint();
//颜色
paint.setColor(Color.BLUE);
//抗锯齿
paint.setAntiAlias(true);
//画笔粗细
paint.setStrokeWidth(2);
//填充
paint.setStyle(Paint.Style.FILL);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Path path=new Path();
canvas.drawCircle(tx,ty,50,paint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//两种方式 一种switch 一种直接写
switch (event.getAction()){
case MotionEvent.ACTION_UP:
tx=event.getX();
ty=event.getY();
break;
case MotionEvent.ACTION_DOWN:
tx=event.getX();
ty=event.getY();
break;
case MotionEvent.ACTION_MOVE:
tx=event.getX();
ty=event.getY();
break;
}
/*tx=event.getX();
ty=event.getY();*/
this.invalidate();
return true;
}
}
2.布局
<?xml version="1.0" encoding="utf-8"?><com.example.rk1130.BallView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>