理解自制Su易做图ceView代码

概述:

最近在读himi的android游戏开发专栏，其中通过前几张剖析View的继承接口类发现Su易做图ceView比较适合做Game Dev然后本人也动手跟着himi的代码敲了几下。最终虽然也达到了himi的运行效果。但是其中还是经过了好多疑点。现在本人将自己的理解发布出来，欢迎交流与学习

Code List:

[java]
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Log;
import android.view.MotionEvent;
import android.view.Su易做图ceHolder;
import android.view.Su易做图ceHolder.Callback;
import android.view.Su易做图ceView;

public class LoginView extends Su易做图ceView implements Callback,Runnable{

    private Canvas canvas; //定义画布对象
    private Thread thread; //定义线程线程对应
    private int ScreenW,ScreenH;    //定义屏幕的宽度和高度
    private Paint paint;    //定义画笔对象
    private Su易做图ceHolder sh;   //声明Su易做图ceHolder对象
    private Resources resources;    //声明资源对象
    private Bitmap bitmapr; //注册bitmap
    private Bitmap bitmapb; //背景bitmap
    private int bp_x,bp_y; //注册背景图宽度高�?
    private boolean flag;
    public static String zh_k = "注册页面";
    private boolean zh_flag = true;
    private String str_pass = "aaa";
    //初始构�?
    public LoginView(Context context) {
        super(context);
        //
        resources = this.getResources();
        bitmapr = BitmapFactory.decodeResource(resources, R.drawable.register); //注册窗口
        bitmapb = BitmapFactory.decodeResource(resources, R.drawable.duola);    //注册背景�?
        thread = new Thread(this);
        sh = this.getHolder();
        sh.addCallback(this);
        paint = new Paint();
        paint.setColor(Color.RED);
        paint.setAntiAlias(true);   //去掉锯齿
        this.setFocusable(true);
        this.setKeepScreenOn(true);     //设置屏幕常亮
        resources = this.getResources();

    }
    public void draw(){
        canvas = sh.lockCanvas();   //得到画布对象
        paint.setColor(Color.RED);
        if(null != canvas){         //在设置横屏的时候坐标算法如下
            canvas.drawColor(Color.WHITE);
            canvas.drawBitmap(bitmapb,
                    -(bitmapb.getWidth() - ScreenW), -(bitmapb
                            .getHeight() - ScreenH), paint);
            //2、3参数为x坐标和y坐标，就是位图paint的左上角位置
            canvas.drawBitmap(bitmapr, bp_x,bp_y, paint);
            sh.unlockCanvasAndPost(canvas);
        }
    }
    @Override
    public void run() {
        while(!flag){
            draw();
            try {
                thread.sleep(1000);
            } catch (Exception e) {
                Log.v("run", "error");
            }
        }
    }
    @Override
    public void su易做图ceCreated(Su易做图ceHolder holder) {
        ScreenW = this.getWidth();
        ScreenH = this.getHeight();
        bp_x = ScreenW/2-bitmapr.getWidth()/2;
        bp_y = ScreenH/2-bitmapr.getHeight()/2;
        thread.start();
    }
    @Override
    public void su易做图ceChanged(Su易做图ceHolder holder, int format, int width,
            int height) {

    }
    @Override
    public void su易做图ceDestroyed(Su易做图ceHolder holder) {

    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();

        if(x > bp_x+14 && x < bp_x+129){ //锁定登陆框姓名区域X轴
            if(y >= bp_y+43 && y <= bp_y+58){ //锁定登陆框姓名区域Y轴
        &nbs

补充：移动开发 , Android ,