目标：
实现一个自定义的MyThread 类，定义多个其实例，
每个实例调用不同的draw()。
失误点：
canvas 不是传递进来的！ 是 通过holder lock得到！！！！！！！！！！！！！！！！！！！
canvas //canvas最易出错！ 因为它的初始化是在holder.lock
关于多线程的实现：
thMain = new MyThread(6,1000, myInterface );
这里多了一个回调接口作为参数；
public interface myInterface {
public void myIFfun();
}
然后再 自定义一个 实现该接口的类叫做 比如 ClassGrassDraw，并在它的myIFfun()中去实现自定义的draw的动作。
以此类推。如此，即实现多个不同的 画的 线程 就实现了。
附代码：
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new mySur(this));
}
}
public interface myInterface {
public void InterfaceFun();
}
public class MyThread extends Thread{
private int WholeTime;
private int PerTime;
private boolean thFlag;
private int counter;
private mySur Sur; //为了使用其成员WholeThreadFlag
private myInterface CallBackObj;
public MyThread(int WholeTime, int PerTime, myInterface CallBackObj, mySur Sur){
this.WholeTime = WholeTime;
this.PerTime = PerTime;
this.CallBackObj = CallBackObj;
this.Sur = Sur;
thFlag = true;
counter = 0;
}
private void setTimer(){
if(WholeTime != 0){
counter += 1;
if(counter * PerTime >= WholeTime * 1000){
thFlag = false;
System.out.println("Timer!! thread exit! ");
}
}
}
@Override
public void run(){
while(Sur.WholeThreadFlag && thFlag){
try {
CallBackObj.InterfaceFun();// 包含draw 和 logic
Thread.sleep(PerTime);
setTimer();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
import android.content.Context;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
public class mySur extends SurfaceView implements Callback{
protected SurfaceHolder holder;
protected Paint paint;
protected int screenW, screenH;
boolean WholeThreadFlag;
private MyThread mainThread;
private MainDraw mainDraw;
public mySur(Context context) {
super(context);
// TODO Auto-generated constructor stub
holder = getHolder();
holder.addCallback(this);
paint = new Paint();
paint.setColor(Color.WHITE);
//bitmap = BitmapFactory.decodeResource(this.getResources(), R.drawable.ic_launcher);
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
// TODO Auto-generated method stub
screenW = getWidth();
screenH = getHeight();
WholeThreadFlag = true;
mainDraw = new MainDraw(this.getContext(),holder,paint);
mainThread = new MyThread(0,50,mainDraw,this);
mainThread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
WholeThreadFlag = false;
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
}
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.SurfaceHolder;
public class MainDraw extends mySur implements myInterface{
private Canvas canvas;
public MainDraw(Context context, SurfaceHolder holder, Paint paint) {
super(context);
// TODO Auto-generated constructor stub
this.holder = holder;
this.paint = paint;
}
private void reallyDraw(){
canvas.drawRect(0, 0, 100, 100, paint);
//System.out.println("hhhhhhhhhhhhhello,world!");
}
private void logic(){
}
private void draw(){
try{
canvas = holder.lockCanvas();
if(canvas != null){
reallyDraw();
}
}catch(Exception e){
}finally{
if(canvas != null){
holder.unlockCanvasAndPost(canvas);
}
}
}
@Override
public void InterfaceFun() {
// TODO Auto-generated method stub
draw();
logic();
}
}
参考：