Question

我正在使用蓝牙开发Android应用。我想让write和read在两个独立的线程中运行。

写线程

class Write extends Thread {

    public void run(){

        while(Bluetooth.threadStateWrite){
            if(LLTestAppActivity.DEBUG){
                Log.d("BLUETOOTH_WRITE", "Write Thread Running!");
            }
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

阅读主题

class Read extends Thread {

public void run(){

    while(Bluetooth.threadStateRead){
        if(LLTestAppActivity.DEBUG){
            Log.d("BLUETOOTH_READ", "Read Thread Running!");
        }
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }       
    }
}
}

我从以下蓝牙类中调用这两个主题：

public class Bluetooth {

Write write;
Read read;

//Constructor
public Bluetooth() {    
    write.start();
    read.start();

}

Write和Read类在Bluetooth类中。

因此，当我尝试实例化蓝牙类时，我在构造函数中获得了NullPointer异常。任何人都可以指导我如何做到这一点？提前谢谢。

Answer 1

在调用write方法之前，您需要使用类构造函数初始化read和start：

public Bluetooth() {    
    write=new Write();  //create Write class Object
    write.start();
    read=new Read();    //create Read class Object
    read.start();

}

线程启动问题

1 个答案: