如何计算android程序创建的线程数

我想知道

如何知道我的程序创建的线程数，以便我能够很好地管理它们并根据需要停止。除了线程的名称之外，还有什么方法可以在Android Debug Monitor的程序中识别由业务逻辑创建的线程吗？ADM输出示例如下：

如果创建线程的服务被销毁，甚至应用程序被明确终止，线程不会停止。线程仅在完成任务时停止，即如果没有显式中断，则在退出run（）时停止

创建了一个示例程序，以便理解，如下所示：

//DemoService.java class
Intent mIntent;

String TAG="Logs";

Thread myThread;

static int k = 0;

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Log.d(TAG,"--------------service started'");
    mIntent = intent;
    final int currentId = startId;

    k++;
    Runnable myRunnable = new Runnable() {
        @Override
        public void run() {

            for (int i = 0; i < 5; i++)
            {
                long endTime = System.currentTimeMillis() + 5*1000;

                while (System.currentTimeMillis() < endTime) {
                    synchronized (this) {
                        try {
                            wait(endTime -
                                    System.currentTimeMillis());

                            int[] numbers = mIntent.getIntArrayExtra("numbers");
                            int result = numbers[0] + numbers[1];

                            Log.d(TAG,"result : " + result);

                        } catch (Exception e) {
                        }
                    }
                }
                Log.i(TAG, "Service running " + currentId);
            }

        }
    };

    myThread = new Thread(myRunnable);
    myThread.start();
    myThread.setName("Test Thread  " + k);

    Log.d(TAG, "Thread Id : " + myThread.getId() + ", " + "Name : " + "Test Thread  " + k);

    checkThreads();
    return Service.START_STICKY;
}

private void checkThreads(){
    Log.d(TAG,"myThread.getName(): " + myThread.getName() + ", " + "myThread.isAlive(): " + myThread.isAlive());

}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

}

调用stopService（）显式停止服务时的输出
05-15 19:05:56.020 30097-30097/? D/日志：------------服务已启动'
05-15 19:05:56.022 30097-30097/? D/日志：线程Id:878，名称：测试线程1
05-15 19:05:56.022 30097-30097/? D/Logs:myThread.getName（）：测试线程1，myThread.isAlive（）：true
05-15 19:06:01.023 30097-31250/? D/记录：结果：77
05-15 19:06:01.023 30097-31250/? I/Logs:服务正在运行1
05-15 19:06:02.283 30097-30097/? D/日志：------------服务已启动'
05-15 19:06:02.284 30097-30097/? D/日志：线程Id:879，名称：测试线程2
05-15 19:06:02.284 30097-30097/? D/Logs:myThread.getName（）：测试线程2，myThread.isAlive（）：true
05-15 19:06:03.004 30097-30097/? D/日志：------------服务已启动'
05-15 19:06:03.005 30097-30097/? D/日志：线程Id:880，名称：测试线程3
05-15 19:06:03.005 30097-30097/? D/Logs:myThread.getName（）：测试线程3，myThread.isAlive（）：true
05-15 19:06:06.024 30097-31250/? D/记录：结果：77
05-15 19:06:06.024 30097-31250/? I/Logs:服务正在运行1
05-15 19:06:07.286 30097-31258/? D/记录：结果：77
05-15 19:06:07.286 30097-31258/? I/Logs:正在运行的服务2
05-15 19:06:08.007 30097-31259/? D/记录：结果：77
05-15 19:06:08.007 30097-31259/? I/Logs:服务正在运行3
05-15 19:06:11.024 30097-31250/? D/记录：结果：77
05-15 19:06:11.024 30097-31250/? I/Logs:服务正在运行1
05-15 19:06:12.286 30097-31258/? D/记录：结果：77
05-15 19:06:12.287 30097-31258/? I/Logs:正在运行的服务2
05-15 19:06:13.007 30097-31259/? D/记录：结果：77
05-15 19:06:13.007 30097-31259/? I/Logs:服务正在运行3
05-15 19:06:16.025 30097-31250/? D/记录：结果：77
05-15 19:06:16.025 30097-31250/? I/Logs:服务正在运行1
05-15 19:06:17.288 30097-31258/? D/记录：结果：77
05-15 19:06:17.288 30097-31258/? I/Logs:正在运行的服务2
05-15 19:06:18.007 30097-31259/? D/记录：结果：77
05-15 19:06:18.007 30097-31259/? I/Logs:服务正在运行3
05-15 19:06:21.025 30097-31250/? D/记录：结果：77
05-15 19:06:21.025 30097-31250/? I/Logs:服务正在运行1
05-15 19:06:21.537 30097-30097/? D/Logs：停止服务线程在进程/VM终止时停止。如果您启动线程，您有责任管理它们，最好是保留对它们的引用并清理它们。如果您不想自己做这件事，这里有
ExecutorService
。谢谢您的回复。这是关于线程行为的。但是，即使在调用stopservice（）之后，我的服务也不会停止。我想知道服务会一直执行到线程执行为止，正如您在输出中看到的那样。那么，使用Intent Service（表示不需要调用stopService（），因为任务完成后两者都会停止）有什么区别呢？另外，对于第一个问题，我明白跟踪线程总数并没有帮助。相反，只要在代码中创建了新线程，就应该进行适当的处理来管理线程或de
public class MainActivity extends AppCompatActivity {

EditText num1,num2;

private String TAG = "Logs";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    num1 = (EditText) findViewById(R.id.num1);
    num2 = (EditText) findViewById(R.id.num2);

}

public void onClickAdd(View view){
    if(view.getId() == R.id.add_btn){
        Intent serviceIntent = new Intent();
        serviceIntent.setClass(MainActivity.this, DemoService.class);

        int[] numbers = new int[2];

        numbers[0]= Integer.parseInt(num1.getText().toString());
        numbers[1]=Integer.parseInt(num2.getText().toString());
        serviceIntent.putExtra("numbers",numbers);
        startService(serviceIntent);
    }

}

public void onClickServiceStop(View view){
    Intent serviceIntent = new Intent();
    serviceIntent.setClass(MainActivity.this, DemoService.class);

    Log.d(TAG,"stopping service");
    stopService(serviceIntent);
}

Output when service is stopped explicitly with a call to stopService()

05-15 19:05:56.020 30097-30097/? D/Logs: --------------service started'
05-15 19:05:56.022 30097-30097/? D/Logs: Thread Id : 878, Name : Test Thread  1
05-15 19:05:56.022 30097-30097/? D/Logs: myThread.getName(): Test Thread  1, myThread.isAlive(): true
05-15 19:06:01.023 30097-31250/? D/Logs: result : 77
05-15 19:06:01.023 30097-31250/? I/Logs: Service running 1
05-15 19:06:02.283 30097-30097/? D/Logs: --------------service started'
05-15 19:06:02.284 30097-30097/? D/Logs: Thread Id : 879, Name : Test Thread  2
05-15 19:06:02.284 30097-30097/? D/Logs: myThread.getName(): Test Thread  2, myThread.isAlive(): true
05-15 19:06:03.004 30097-30097/? D/Logs: --------------service started'
05-15 19:06:03.005 30097-30097/? D/Logs: Thread Id : 880, Name : Test Thread  3
05-15 19:06:03.005 30097-30097/? D/Logs: myThread.getName(): Test Thread  3, myThread.isAlive(): true
05-15 19:06:06.024 30097-31250/? D/Logs: result : 77
05-15 19:06:06.024 30097-31250/? I/Logs: Service running 1
05-15 19:06:07.286 30097-31258/? D/Logs: result : 77
05-15 19:06:07.286 30097-31258/? I/Logs: Service running 2
05-15 19:06:08.007 30097-31259/? D/Logs: result : 77
05-15 19:06:08.007 30097-31259/? I/Logs: Service running 3
05-15 19:06:11.024 30097-31250/? D/Logs: result : 77
05-15 19:06:11.024 30097-31250/? I/Logs: Service running 1
05-15 19:06:12.286 30097-31258/? D/Logs: result : 77
05-15 19:06:12.287 30097-31258/? I/Logs: Service running 2
05-15 19:06:13.007 30097-31259/? D/Logs: result : 77
05-15 19:06:13.007 30097-31259/? I/Logs: Service running 3
05-15 19:06:16.025 30097-31250/? D/Logs: result : 77
05-15 19:06:16.025 30097-31250/? I/Logs: Service running 1
05-15 19:06:17.288 30097-31258/? D/Logs: result : 77
05-15 19:06:17.288 30097-31258/? I/Logs: Service running 2
05-15 19:06:18.007 30097-31259/? D/Logs: result : 77
05-15 19:06:18.007 30097-31259/? I/Logs: Service running 3
05-15 19:06:21.025 30097-31250/? D/Logs: result : 77
05-15 19:06:21.025 30097-31250/? I/Logs: Service running 1
05-15 19:06:21.537 30097-30097/? D/Logs: stopping service    <----- Service stopped explcitly with stopService()
05-15 19:06:22.288 30097-31258/? D/Logs: result : 77
05-15 19:06:22.288 30097-31258/? I/Logs: Service running 2
05-15 19:06:23.008 30097-31259/? D/Logs: result : 77
05-15 19:06:23.008 30097-31259/? I/Logs: Service running 3
05-15 19:06:27.288 30097-31258/? D/Logs: result : 77
05-15 19:06:27.289 30097-31258/? I/Logs: Service running 2
05-15 19:06:28.008 30097-31259/? D/Logs: result : 77
05-15 19:06:28.008 30097-31259/? I/Logs: Service running 3


Output when app is killed explicitly, thread and service continues to run
05-15 19:08:35.093 30097-30097/? D/Logs: --------------service started'
05-15 19:08:35.094 30097-30097/? D/Logs: Thread Id : 882, Name : Test Thread  4
05-15 19:08:35.094 30097-30097/? D/Logs: myThread.getName(): Test Thread  4, myThread.isAlive(): true
05-15 19:08:38.382 30097-30097/? D/Logs: --------------service started'
05-15 19:08:38.382 30097-30097/? D/Logs: Thread Id : 883, Name : Test Thread  5
05-15 19:08:38.382 30097-30097/? D/Logs: myThread.getName(): Test Thread  5, myThread.isAlive(): true
05-15 19:08:38.828 30097-30097/? D/Logs: --------------service started'
05-15 19:08:38.829 30097-30097/? D/Logs: Thread Id : 884, Name : Test Thread  6
05-15 19:08:38.829 30097-30097/? D/Logs: myThread.getName(): Test Thread  6, myThread.isAlive(): true
05-15 19:08:40.096 30097-31891/? D/Logs: result : 77
05-15 19:08:40.096 30097-31891/? I/Logs: Service running 1
05-15 19:08:43.384 30097-31974/? D/Logs: result : 77
05-15 19:08:43.384 30097-31974/? I/Logs: Service running 2
05-15 19:08:43.830 30097-31981/? D/Logs: result : 77
05-15 19:08:43.830 30097-31981/? I/Logs: Service running 3
05-15 19:08:45.097 30097-31891/? D/Logs: result : 77
05-15 19:08:45.097 30097-31891/? I/Logs: Service running 1
05-15 19:08:48.426 30097-31974/? D/Logs: result : 77
05-15 19:08:48.426 30097-31974/? I/Logs: Service running 2
05-15 19:08:48.868 30097-31981/? D/Logs: result : 77
05-15 19:08:48.868 30097-31981/? I/Logs: Service running 3
05-15 19:08:50.137 30097-31891/? D/Logs: result : 77
05-15 19:08:50.137 30097-31891/? I/Logs: Service running 1
05-15 19:08:53.467 30097-31974/? D/Logs: result : 77
05-15 19:08:53.467 30097-31974/? I/Logs: Service running 2
05-15 19:08:53.908 30097-31981/? D/Logs: result : 77
05-15 19:08:53.908 30097-31981/? I/Logs: Service running 3
05-15 19:08:55.176 30097-31891/? D/Logs: result : 77
05-15 19:08:55.176 30097-31891/? I/Logs: Service running 1
05-15 19:08:58.508 30097-31974/? D/Logs: result : 77
05-15 19:08:58.508 30097-31974/? I/Logs: Service running 2
05-15 19:08:58.948 30097-31981/? D/Logs: result : 77
05-15 19:08:58.948 30097-31981/? I/Logs: Service running 3
05-15 19:09:00.218 30097-31891/? D/Logs: result : 77
05-15 19:09:00.218 30097-31891/? I/Logs: Service running 1
05-15 19:09:03.548 30097-31974/? D/Logs: result : 77
05-15 19:09:03.548 30097-31974/? I/Logs: Service running 2
05-15 19:09:03.985 30097-31981/? D/Logs: result : 77
05-15 19:09:03.985 30097-31981/? I/Logs: Service running 3