单点触控

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主Activiy

package com.example.lodier;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.widget.RelativeLayout;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        RelativeLayout rllt= (RelativeLayout) findViewById(R.id.lt);        final DrawCircle drawCirc=new DrawCircle(this);        drawCirc.setMinimumWidth(10);        drawCirc.setMinimumHeight(10);        rllt.addView(drawCirc);    }}

DrawCircle
类

package com.example.lodier;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 2016/11/1 0001. */public class DrawCircle extends View {    float x = 40;    float y = 50;    Paint mPaint=new Paint();    //View的构造方法    public DrawCircle(Context context) {        super(context);    }    public DrawCircle(Context context, AttributeSet attrs) {        super(context, attrs);    }    public DrawCircle(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        mPaint.setColor(Color.BLUE);        canvas.drawCircle(x,y,20,mPaint);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        x=event.getX();        y=event.getY();        //刷新的作用        invalidate();        return true;    }}

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