java wait和notify的使用

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多线程同步，例如想要一个线程结束后再执行另外一个线程，可以在主线程中使用wait等待，子线程中使用notify唤醒主线程
下列例子：目的想执行完Beep循环后再执行Beef循环
package com.example.g;import java.lang.reflect.Method;import com.pax.api.BaseSystemManager;import android.os.Build;import android.os.Bundle;import android.os.Message;import android.os.SystemClock;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.util.Log;import android.os.Handler;import android.widget.TextView;import android.widget.Button;import android.os.Message;public class MainActivity extends Activity implements OnClickListener{    private TextView text = null;    private TextView tv = null;    private Button startBt = null;    private final static int OPEN_SUCCESS = 0;    private final static int OPEN_FAIL = 1;    private final static int ClOSE_SUCCESS = 2;    private final static int CLOSE_FAIL = 3;    private final static int START_TEST = 4;    private final static int NOTIFY = 5;    private boolean flag = false;    private BaseSystemManager baseSystemManager = null;    private static Boolean waitNotifyFlag = Boolean.valueOf(true);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        text = (TextView)findViewById(R.id.text);        tv = (TextView)findViewById(R.id.tv);        startBt = (Button)findViewById(R.id.start);        startBt.setOnClickListener(this);        text.setText(getResources().getString(R.string.start));        try{            baseSystemManager = BaseSystemManager.getInstance();        }catch(Exception e){        }    }    public void onClick(View v) {        text.setText(getResources().getString(R.string.start_test));        Thread testThread = new GThread();        testThread.start();        Message msg = new Message();        // 等待通信线程完成测试        try {            synchronized (waitNotifyFlag) {                while(!flag){                    waitNotifyFlag.wait();                }            }        } catch (InterruptedException e) {            e.printStackTrace();        }        SystemClock.sleep(2000);        msg.what = START_TEST;        msg.obj = (Object)getResources().getString(R.string.wait);        handler.sendMessage(msg);        int i;        for(i = 0; i < 10; i++){            try{                baseSystemManager.beef((byte)0, 1000);            }catch(Exception e){}        }    }    class GThread extends Thread {        public void run() {            Message msg = new Message();            int i;            for(i = 0; i < 1000; i++){                try{                    baseSystemManager.beep();                }catch(Exception e){}            }            SystemClock.sleep(3000);            // 测试完成，唤醒主线程            synchronized (waitNotifyFlag) {                flag = true;                waitNotifyFlag.notifyAll();            }        }    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    public Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            // TODO Auto-generated method stub            super.handleMessage(msg);            switch(msg.what){                case 0:                case 1:                case 2:                case 3:                case 4:                    text.setText(msg.obj.toString());                    break;                case 5:                    tv.setText(msg.obj.toString());                    break;            }        }    };    }}
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