自定义View：点、图片随手指而移动的View

自定义View：点、图片随手指而移动的View，例子很简单，算是入门的view练习。

一、

点的view

package com.example.viewmodel;

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;

public class PointView extends View
{
public float curX=40,curY=50;
private Paint paint=new Paint();

public PointView(Context context)
{
super(context);
}
public PointView(Context context,AttributeSet attrs)
{
super(context,attrs);
}
public PointView(Context context,AttributeSet attrs,int defStyleAttr)
{
super(context,attrs,defStyleAttr);
}

@Override
public boolean onTouchEvent(MotionEvent event)
{
super.onTouchEvent(event);
curX=event.getX();
curY=event.getY();
invalidate();
return true;
}

@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
paint.setColor(Color.RED);
canvas.drawCircle(curX, curY, 10, paint);
}

}


二、
图片移动View

package com.example.viewmodel;

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

public class PictureView extends View
{

private float curX=500,curY=500;

public PictureView(Context context)
{
super(context);
// TODO Auto-generated constructor stub
}
public PictureView(Context context,AttributeSet attr)
{
super(context,attr);
// TODO Auto-generated constructor stub
}
public PictureView(Context context,AttributeSet attr,int defStyleAttr)
{
super(context,attr,defStyleAttr);
// TODO Auto-generated constructor stub
}

@Override
public boolean onTouchEvent(MotionEvent event)
{
super.onTouchEvent(event);
curX=event.getX();
curY=event.getY();
postInvalidate();
return true;
}

@Override
public void onDraw(Canvas canvas)
{
super.onDraw(canvas);
canvas.drawColor(Color.WHITE);
Paint paint=new Paint();
Bitmap bitmap=BitmapFactory.decodeResource(this.getResources(), R.drawable.picture);
canvas.drawBitmap(bitmap, curX, curY,paint);
if(bitmap.isRecycled())
{
bitmap.recycle();
}
}

}