自定義view,跟隨手指滑動的圓球

最近在學習自定義控件,菜鳥一枚,自己寫的東西大神勿噴,僅作交流

廢話不多說,直接上碼

package com.jingcai.fu.planegame;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by Administrator on 2016/3/11.
 */
public class DrawView extends View {

    public float currentX= 40;
    public float currentY= 50;
    //定義創建畫筆
    Paint paint =new Paint();

    public DrawView(Context context) {
        super(context);
    }

    public DrawView(Context context,AttributeSet set) {
        super(context,set);
    }


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //設置畫筆的顏色
        paint.setColor(Color.RED);
        canvas.drawCircle(currentX,currentY,15,paint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //當前組件的currentX,currentY的兩個屬性
        this.currentX = event.getX();
        this.currentY = event.getY();
        //通知該組件重繪
        this.invalidate();

        //返回true表明方法已經處理事件
        return true;

    }
}
 

還有xml佈局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.jingcai.fu.planegame.MainActivity">

    <com.jingcai.fu.planegame.DrawView

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</RelativeLayout>

在代碼中不需要做處理  一個跟着手指運動的view就出來了