目的：创建多个Android线程，并使用Android Studio的Profiler工具验证分析。

工具：Android Studio

源码：https://gitee.com/guangwei_jiang/thread-test

步骤：

1.?创建一个简单的多线程工程，或者使用本文的示例代码；

public class MainActivity extends AppCompatActivity{
    public static String TAG = "PID_TID_Test";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.i(TAG, "MainActivity: Process ID: " + Os.getpid() + ", Parent Process ID:" + Os.getppid() + ", Thread ID: " + Os.gettid());

        myRunnable();
        myThread();
        myTimer();
    }

    private void myThread() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    Log.i(TAG, "myThread: Process ID: " + Os.getpid() + ", Parent Process ID:" + Os.getppid() + ", Thread ID: " + Os.gettid());
                    try {
                        Thread.sleep(10);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }

    private void myRunnable() {
        new Runnable() {
            @Override
            public void run() {
                Log.i(TAG, "myRunnable: Process ID: " + Os.getpid() + ", Parent Process ID:" + Os.getppid() + ", Thread ID: " + Os.gettid());
            }
        }.run();
    }

    private void myTimer () {
        Timer timer= new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                Log.i(TAG, "myTimer: id: " + Os.getpid() + ", Parent_ID:" + Os.getppid() + ", Thread ID: " + Os.gettid());
            }
        }, 10, 10);
    }


}

?2. 运行程序，打印如下log
从log中可以看到，myThread和myTimer创建的线程号分别为28761和28762，和主线程28707是不同的。

I/PID_TID_Test: MainActivity: Process ID: 28707, Parent Process ID:670, Thread ID: 28707
I/PID_TID_Test: myRunnable: Process ID: 28707, Parent Process ID:670, Thread ID: 28707
I/PID_TID_Test: myThread: Process ID: 28707, Parent Process ID:670, Thread ID: 28761
I/PID_TID_Test: myThread: Process ID: 28707, Parent Process ID:670, Thread ID: 28761
I/PID_TID_Test: myTimer: id: 28707, Parent_ID:670, Thread ID: 28762
I/PID_TID_Test: myThread: Process ID: 28707, Parent Process ID:670, Thread ID: 28761
I/PID_TID_Test: myTimer: id: 28707, Parent_ID:670, Thread ID: 28762