畫圓 圓隨著滑鼠點選而移動
阿新 • • 發佈:2018-12-01
1、自定義一個類繼承View
package com.gj.gejuan20181130;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class BallView extends View {
private Paint mCirclePaint; private int x=100; private int y=100; 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(); } @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) public BallView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); init(); } private void init() { mCirclePaint = new Paint();//建立畫筆 mCirclePaint.setStyle(Paint.Style.FILL);//設定樣式 mCirclePaint.setColor(Color.GREEN);//設定顏色 } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawCircle(x,y,100,mCirclePaint);//畫圓 第一個引數x軸,第二個引數y,軸座標,第三個引數半徑,第四個引數畫筆 } @Override public boolean onTouchEvent(MotionEvent event) { x = (int) event.getX();//獲得X座標 y = (int) event.getY();//獲得y座標 invalidate();//重新整理 return true;//攔截處理 }
}
注意:
build一下然後在main佈局中引用自定義view