通过Handler与线程嵌套TimerTask实现循环交替任务 分类： Android 2015-07-24 16:14 162人阅读 评论(0) 收藏
创建两个循环交替任务：10秒后，A任务执行。 A任务里面创建一个B任务200毫秒后执行，B任务里面又创建一个A任务10秒后执行，如此往复。
1，首先采用Handler与线程的sleep(long)方法；
Handler主要用来处理接受到的消息。这只是最主要的方法，当然Handler里还有其他的方法供实现，有兴趣的可以去查API，这里不过多解释。
1. 定义一个Handler类，用于处理接受到的Message。
2. 新建一个实现Runnable接口的线程类，如下：3. 在需要启动线程的地方加入下面语句：
new Thread(new MyThread()).start();
4.测试类
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
/**
* @author Administrator
*/
public class TraditionalTime2 {
/*
* 创建两个循环交替任务：10秒后，A任务执行。
* A任务里面创建一个B任务200毫秒后执行，B任务里面又创建一个A任务10秒后执行，如此往复。
*
*/
public static void main(String[] args) {
TraditionalTime2 t2=new TraditionalTime2();
new Timer().schedule(t2.new A(), 10000);
//用于打印时间秒数
while (true) {
System.out.println(new Date().getSeconds());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class A extends TimerTask {
@Override
public void run() {
System.out.println("A bombing!");
new Timer().schedule(new B(), 200);
}
}
class B extends TimerTask {
@Override
public void run() {
System.out.println("B bombing!");
new Timer().schedule(new A(), 10000);
}
}
}
完整代码：
/**
* 每隔10s发一次整包查询请求，10秒后，A（发送整个包查询）任务执行。
* A（发送整包查询）任务里面创建一个B（发送查询一个ID包）任务200毫秒后执行
*/
// 查询数据
Handler handler = new Handler() {
public void handleMessage(Message msg) {
// 要做的事情发送查询请求
System.out.println("每隔10s发一次查询包请求");
/**
* 枚举类型的遍历
* 间隔200ms，发下一个包;
*/
PackageId[] allPackageId = PackageId.values();
for (PackageId aPackageId : allPackageId) {
// System.out.println("200ms发一次查询id!");
System.out.println(" 当前名字： " + aPackageId.name());
System.out.println(" 当前序号： " + aPackageId.ordinal());
// System. out .println( " 当前： " + aPackageId);
byte[] data = { 0x01 };
PumpPackage myPackage = new PumpPackage(aPackageId, data);
util.writePort(myPackage.getSendArray());
// new Thread(new QueryThread()).start();
new Timer().schedule(new QueryPackageId(), 5000);//QueryPackageId 200毫秒后执行
}
super.handleMessage(msg);
}
};
public class QueryThread implements Runnable {
@Override
public void run() {
while (true) {
try {
Thread.sleep(10000);// 线程暂停10秒，单位毫秒
Message message = new Message();
message.what = 1;
handler.sendMessage(message);// 发送消息
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
/**
* 间隔200毫秒发一个包id查询请求
* @author sooner
*
*/
class QueryPackageId extends TimerTask {
@Override
public void run() {
System.out.println("200ms发一次查询id!");
}
}
@Overridepublic void didPackageReceived(blePort port, byte[] Received) {
// 接收到数组 解码为包
PumpPackage package1 = new PumpPackage(Received);
// 返回数据有问题
if (package1.isValid()) {
mReceivedData = package1.toString();
mReceivedId = package1.getPackageId();
// mReceivedValue =package1.getDataArray().toString();
// 包中需要的数据部分
try {
mReceivedValue = PumpPackage.bytesToInt(package1
.getDataArray());
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(mReceivedData);
System.out.println(mReceivedId);
System.out.println(mReceivedValue);
//
cs = String.valueOf(mReceivedValue);
System.out.println(cs);
// 接收到数据后更新UI状态
PumpFragmentConnect.updateUiObjectState();
PumpFragmentConnect.runRow();
PumpFragmentConnect.updateUiObject((String) cs);
}
runOnUiThread(new Runnable() {
@Override
public void run() {
PumpFragmentConnect.updateUiObject((String) cs);
// mLastSecondTotalReceiveSize = mTotalReceiveSize;
}
});
}
调试记录：
07-24 17:49:50.169: I/System.out(5251): 当前名字： UMToSlave_QuerySeq
07-24 17:49:50.169: I/System.out(5251): 当前序号： 15
07-24 17:49:50.179: D/ACSUtilityService(5251): There are 1 datas to be sended...
07-24 17:49:50.179: D/ACSUtilityService(5251): sending data...count0
07-24 17:49:50.179: D/ACSUtilityService(5251): writePort 1
07-24 17:49:50.179: D/ACSUtilityService(5251): writePort 2
07-24 17:49:50.179: D/ACSUtilityService(5251): writePort 3
07-24 17:49:50.179: D/ACSUtilityService(5251): writePort 4
07-24 17:49:50.179: D/ACSUtilityService(5251): data: [B@42afd448
07-24 17:49:50.179: D/BluetoothGatt(5251): writeCharacteristic() - uuid: 0000ffb2-0000-1000-8000-00805f9b34fb
07-24 17:49:50.189: D/BluetoothGatt(5251): onCharacteristicWrite() - Device=B4:99:4C:6E:33:1B UUID=0000ffb2-0000-1000-8000-00805f9b34fb Status=0
07-24 17:49:50.189: D/ACSUtilityService(5251): onCharacteristicWrite
07-24 17:49:50.189: D/ACSUtilityService(5251): notify workerThread
07-24 17:49:50.189: D/ACSUtilityService(5251): synchronized...
07-24 17:49:50.189: D/ACSUtilityService(5251): send succeed
07-24 17:49:50.189: E/ACSUtility(5251): EventHandler got a message.flag is 8
07-24 17:49:52.649: D/BluetoothGatt(5251): onNotify() - Device=B4:99:4C:6E:33:1B UUID=0000ffb2-0000-1000-8000-00805f9b34fb
07-24 17:49:52.649: D/ACSUtilityService(5251): onCharacteristicChanged
07-24 17:49:52.649: D/ACSUtilityService(5251): data line : length = 10
07-24 17:49:52.659: E/ACSUtility(5251): EventHandler got a message.flag is 5
07-24 17:49:52.659: W/System.err(5251): java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
07-24 17:49:52.659: W/System.err(5251): at com.brio.bluetooth.PumpPackage.bytesToInt(PumpPackage.java:234)
07-24 17:49:52.659: W/System.err(5251): at com.brio.activity.StartActivity$1.didPackageReceived(StartActivity.java:186)
07-24 17:49:52.659: W/System.err(5251): at com.brio.util.ACSUtility$2.handleMessage(ACSUtility.java:136)
07-24 17:49:52.659: W/System.err(5251): at android.os.Handler.dispatchMessage(Handler.java:102)
07-24 17:49:52.659: W/System.err(5251): at android.os.Looper.loop(Looper.java:136)
07-24 17:49:52.659: W/System.err(5251): at android.app.ActivityThread.main(ActivityThread.java:5050)
07-24 17:49:52.659: W/System.err(5251): at java.lang.reflect.Method.invokeNative(Native Method)
07-24 17:49:52.659: W/System.err(5251): at java.lang.reflect.Method.invoke(Method.java:515)
07-24 17:49:52.659: W/System.err(5251): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-24 17:49:52.659: W/System.err(5251): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
07-24 17:49:52.659: W/System.err(5251): at dalvik.system.NativeStart.main(Native Method)
07-24 17:49:52.659: I/System.out(5251): id: UpperMoni_CmdInValid length: 1 data: [-86, -69, 2, 0, 1, 102, -60, -12, -26, -73]
07-24 17:49:52.659: I/System.out(5251): UpperMoni_CmdInValid
07-24 17:49:52.659: I/System.out(5251): 0
07-24 17:49:52.659: I/System.out(5251): 0
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