刚学习安卓几个月，自己写了一个简单的自定义View

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package com.hy.rpg;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.RelativeLayout;

import com.hy.rpg.view.MeteorView;

import com.hy.rpg.view.MeteorView.OnViewStopListener;

public class MainActivity   extends Activity   implements OnViewStopListener   {

    private static final String   TAG = <span style="font-size: 9pt; line-height: 25.2px;">MainActivity</span><span   style="font-size: 9pt; line-height: 1.8em;">.class.getSimpleName();</span><br   data-filtered="filtered">    protected RelativeLayout layout;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        layout   = new RelativeLayout(this);

        layout.setBackgroundResource(R.mipmap.about_bg);

        initLayout();

        setContentView(layout);

    }

    private void initLayout() {

        for (int i = 0; i < 10; i++) {

            MeteorView   view = new MeteorView(this);

            view.setOnViewStopListener(this);

            layout.addView(view);

        }

    }

    @Override

    protected void onPause() {

        super.onPause();

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        layout.removeAllViews();

    }

    @Override

    public void viewStop(View view) {

        layout.removeView(view);

        Log.e(TAG,   "" +   layout.getChildCount());

        if (layout.getChildCount() != 0) {

            MeteorView   meteorView = new MeteorView(this);

            meteorView.setOnViewStopListener(this);

            layout.addView(meteorView);

        }

    }

}

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package com.hy.rpg.view;

import android.content.Context;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.os.Handler;

import android.util.AttributeSet;

import android.view.View;

import com.hy.rpg.R;

import com.hy.rpg.utils.Utils;

/**

 * meteor view

 *

 * @author HY

 */

@SuppressWarnings("ALL")

public class MeteorView   extends View {

    /*message of view   stop*/

    private static   final int VIEW_STOP = 0;

    /*screen size*/

    protected int   width, height;

    /*X and Y   coordinate*/

    protected int   coordinateX, coordinateY;

    /*Y coordinate   max value*/

    protected int   maxY;

    protected Paint   mPaint;

    protected Bitmap   bitmap;

    protected   Resources res;

    /*handle the   massage when this view will stop*/

    private Handler   mHandler = new Handler() {

        public   void handleMessage(android.os.Message msg) {

            listener.viewStop(MeteorView.this);

        }

    };

    public   MeteorView(Context context) {

        this(context,   null);

    }

    public   MeteorView(Context context, AttributeSet attrs) {

        this(context,   attrs, 0);

    }

    public   MeteorView(Context context, AttributeSet attrs, int defStyleAttr) {

        super(context,   attrs, defStyleAttr);

        res   = this.getResources();

        height   = Utils.getHeight(res);

        width   = Utils.getWidth(res);

        maxY   = height - Utils.getDpSize(100, res);

        /*generate   random coordinate in screen*/

        coordinateX   = Utils.getRanNum(width * 3 / 4) + (width / 4);

        coordinateY   = Utils.getRanNum(height / 2);

        mPaint   = new Paint();

        bitmap   = BitmapFactory.decodeResource(res, R.mipmap.ic_meteor);

        new   MeteorThread().start();

    }

    @Override

    protected void   onDraw(Canvas canvas) {

        super.onDraw(canvas);

        canvas.drawBitmap(bitmap,   coordinateX, coordinateY, mPaint);

    }

    class   MeteorThread extends Thread {

        @Override

        public   void run() {

            boolean   flag = true;

            int   rate = CommonUtils.getRanNum(7) + 3;

            while   (flag) {

                coordinateX   -= rate;

                coordinateY   += rate;

                if   (coordinateX <= 0 || coordinateY >= maxY) {

                    flag   = false;

                    mHandler.sendEmptyMessage(VIEW_STOP);

                }

                try   {

                    Thread.sleep(20);

                }   catch (InterruptedException e) {

                    e.printStackTrace();

                }

                postInvalidate();

            }

        }

    }

    protected   OnViewStopListener listener;

    public void   setOnViewStopListener(OnViewStopListener listener) {

        this.listener   = listener;

    }

    /**

     * view stop   listener

     *

     * @author   HY

     */

    public interface OnViewStopListener {

        void viewStop(View view);

    }

}

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package com.hy.rpg.utils;

import android.content.res.Resources;

import android.util.DisplayMetrics;

import java.util.Random;

/**

 * Created by HY on 2016/12/27.

 * get phone info

 */

public class Utils   {

    /**

     * get   window width

     *

     * @param   res resource

     * @return   window width

     */

    public static int getWidth(Resources   res) {

        DisplayMetrics   outMetrics = res.getDisplayMetrics();

        return outMetrics.widthPixels;

    }

    /**

     * get   window height

     *

     * @param   res resource

     * @return   window height

     */

    public static int getHeight(Resources   res) {

        DisplayMetrics   outMetrics = res.getDisplayMetrics();

        return outMetrics.heightPixels;

    }

    /**

     * get   window dpi

     *

     * @param   res resource

     * @return   window dpi

     */

    private static int getDensity(Resources   res) {

        DisplayMetrics   outMetrics = res.getDisplayMetrics();

        return outMetrics.densityDpi;

    }

    /**

     * get dp   size

     *

     * @param   pixelSize pixel size

     * @param   res       resource

     * @return   dp size

     */

    public static int getDpSize(int pixelSize, Resources res) {

        return pixelSize * getDensity(res) / 160;

    }

    /**

     * get   random

     *

     * @param   max random number max value

     * @return   random number

     */

    public static int getRanNum(int max) {

        Random   random = new Random();

        return max > 0 ? random.nextInt(max) : random.nextInt();

    }

}