package com.yarin.android.Examples_05_01;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.view.MotionEvent;public class Activity01 extends Activity
{
private static final int REFRESH = 0x000001;
/* 声明GameView类对象 */
private GameView mGameView = null; /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState); /* 实例化GameView对象 */
this.mGameView = new GameView(this); // 设置显示为我们自定义的View(GameView)
setContentView(mGameView); // 开启线程
new Thread(new GameThread()).start();
} Handler myHandler = new Handler()
{
//接收到消息后处理
public void handleMessage(Message msg)
{
switch (msg.what)
{
case Activity01.REFRESH:
mGameView.invalidate();
break;
}
super.handleMessage(msg);
}
}; class GameThread implements Runnable
{
public void run()
{
while (!Thread.currentThread().isInterrupted())
{
Message message = new Message();
message.what = Activity01.REFRESH;
//发送消息
Activity01.this.myHandler.sendMessage(message);
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
}
}
}
}
/**
* 当然可以将GameThread类这样写
* 同样可以更新界面,并且不在需要
* Handler在接受消息
class GameThread implements Runnable
{
public void run()
{
while (!Thread.currentThread().isInterrupted())
{
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
}
//使用postInvalidate可以直接在线程中更新界面
mGameView.postInvalidate();
}
}
}
*/
//详细事件处理见第三章
//当然这些事件也可以写在GameView中
//触笔事件
public boolean onTouchEvent(MotionEvent event)
{
return true;
}
//按键按下事件
public boolean onKeyDown(int keyCode, KeyEvent event)
{
return true;
}
//按键弹起事件
public boolean onKeyUp(int keyCode, KeyEvent event)
{
switch (keyCode)
{
//上方向键
case KeyEvent.KEYCODE_DPAD_UP:
mGameView.y-=3;
break;
//下方向键
case KeyEvent.KEYCODE_DPAD_DOWN:
mGameView.y+=3;
break;
}
return false;
}
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
{
return true;
}
}这是书中的例子。view 类的代码就不贴了。请问红色的行怎么理解。去掉Activity01为什么不可以
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.view.MotionEvent;public class Activity01 extends Activity
{
private static final int REFRESH = 0x000001;
/* 声明GameView类对象 */
private GameView mGameView = null; /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState); /* 实例化GameView对象 */
this.mGameView = new GameView(this); // 设置显示为我们自定义的View(GameView)
setContentView(mGameView); // 开启线程
new Thread(new GameThread()).start();
} Handler myHandler = new Handler()
{
//接收到消息后处理
public void handleMessage(Message msg)
{
switch (msg.what)
{
case Activity01.REFRESH:
mGameView.invalidate();
break;
}
super.handleMessage(msg);
}
}; class GameThread implements Runnable
{
public void run()
{
while (!Thread.currentThread().isInterrupted())
{
Message message = new Message();
message.what = Activity01.REFRESH;
//发送消息
Activity01.this.myHandler.sendMessage(message);
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
}
}
}
}
/**
* 当然可以将GameThread类这样写
* 同样可以更新界面,并且不在需要
* Handler在接受消息
class GameThread implements Runnable
{
public void run()
{
while (!Thread.currentThread().isInterrupted())
{
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
}
//使用postInvalidate可以直接在线程中更新界面
mGameView.postInvalidate();
}
}
}
*/
//详细事件处理见第三章
//当然这些事件也可以写在GameView中
//触笔事件
public boolean onTouchEvent(MotionEvent event)
{
return true;
}
//按键按下事件
public boolean onKeyDown(int keyCode, KeyEvent event)
{
return true;
}
//按键弹起事件
public boolean onKeyUp(int keyCode, KeyEvent event)
{
switch (keyCode)
{
//上方向键
case KeyEvent.KEYCODE_DPAD_UP:
mGameView.y-=3;
break;
//下方向键
case KeyEvent.KEYCODE_DPAD_DOWN:
mGameView.y+=3;
break;
}
return false;
}
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
{
return true;
}
}这是书中的例子。view 类的代码就不贴了。请问红色的行怎么理解。去掉Activity01为什么不可以
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