android thread

本周在开发安卓采样过程中，学习了一下java的线程知识，java线程用到如下几个类和接口，

Thread，Runnable，如果要开线程，只要实现Runnable接口run()就可以了，最后Thread.start()，

但是在线程过程中，逻辑层和显示层的交互不能直接在线程中进行，需要类似发消息到外面执行，

用到如下两个类Handler，Message，Handler.sendMessage()，

附上主要代码：

// 处理采样线程的类
static Handler handleSampleThreadHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
}
};

// 开线程
Thread threadSample = new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
myApp.samplingBoolean = true;

// 每秒点数
int nSecondPointCountInteger = myApp.nSecondPointCountInteger;
// 每屏点数
int nScreenShowPointInteger = myApp.nScreenShowPointInteger;
// 每次取点个数
int nPetGetPointCountInteger = nSecondPointCountInteger / 10;
// 信号频率
double dbSignalFrequencyDouble = 0.5;
// 采样频率
double dbSampleFrequencyDouble = myApp.dbSampleFrequencyDouble;

while (myApp.samplingBoolean) {
Message messageSampleMessage = new Message();
messageSampleMessage.what = 1;
handleSampleThreadHandler.sendMessage(messageSampleMessage);

Integer nYuInteger = myApp.numberInteger % nScreenShowPointInteger;
for (int i = 0; i < nPetGetPointCountInteger; i++) {
double xValueDouble = myApp.numberInteger / dbSampleFrequencyDouble;
myApp.ch1ValueArrayDoubles[nYuInteger + i] = 800 * Math.sin(
2 * Math.PI * dbSignalFrequencyDouble * xValueDouble);
myApp.numberInteger++;
}

// 休眠100ms
try {
Thread.sleep(100);
} catch (Exception e) {
// TODO: handle exception
}
}
}
});
threadSample.start();