Android 开发 知晓各种id信息（获取线程ID、activityID、内核ID）

		/**
		 * Returns the identifier of this process's user.
		 * 返回此进程的用户的标识符。
		 */
		Log.e(TAG, "Process.myUid() = " + android.os.Process.myTid());

		/**
		 * Returns the identifier of this process, which can be used with
		 * killProcess and sendSignal.
		 * 返回此进程的标识符，可用于进程和发送信号。
		 */
		Log.e(TAG, "Process.myPid() = " + android.os.Process.myPid());

		/**
		 * Returns the identifier of the calling thread, which be used with
		 * setThreadPriority(int, int).
		 * 返回调用线程的标识符，该标识符与StTeRead优先级（int，int）。
		 */
		Log.e(TAG, "Process.myTid() = " + android.os.Process.myTid());

		/**
		 * Returns the thread's identifier. The ID is a positive long generated
		 * on thread creation, is unique to the thread, and doesn't change
		 * during the lifetime of the thread; the ID may be reused after the
		 * thread has been terminated.
		 * 返回线程的标识符。ID是正长生成的关于线程创建，对于线程是唯一的，并且不会改变。
		 * 在线程的生存期内，ID可以在线程已被终止。
		 */

		//返回当前线程的id
		Log.e(TAG, "Thread.currentThread().getId() = "
				+ Thread.currentThread().getId());
		//返回主线程的id
		Log.e(TAG, "getMainLooper().getThread().getId() = "
				+ getMainLooper().getThread().getId());

		//返回当前应用的主线程id
		Log.e(TAG,
                        "((getApplication().getMainLooper()).getThread()).getId() = "
                                + ((getApplication().getMainLooper()).getThread())
                                .getId());

		/**
		 * Return the identifier of the task this activity is in. This
		 * identifier will remain the same for the lifetime of the activity.
		 * 返回此活动正在执行的任务的标识符。这个标识符对于活动的生存期将保持不变。
		 */
		//返回activity任务栈的id
		Log.e(TAG, "getTaskId() = " + getTaskId());

		/**
		 * The kernel user-ID that has been assigned to this application;
		 * currently this is not a unique ID (multiple applications can have the
		 * same uid).
		 * 已分配给该应用程序的内核用户ID；这不是一个唯一的ID（多个应用程序可以有相同的UID）。
		 */
		Log.e(TAG, "getApplicationInfo().uid = " + getApplicationInfo().uid);

		/**
		 * The name of the process this application should run in. From the
		 * "process" attribute or, if not set, the same as packageName.
		 * 此应用程序应运行的进程的名称。从“进程”属性，或如果没有设置，与PACKAGEName相同。
		 */
		Log.e(TAG, "getApplicationInfo().processName = "
				+ getApplicationInfo().processName);

		/**
		 * 得到当前activity的信息
		 */
		Log.e(TAG, "Activity.toString:"+this.toString());
		

		new Thread(new Runnable() {

			@Override
			public void run() {
				//返回当前线程的id
				// TODO Auto-generated method stub
				Log.e(TAG, "Thread.currentThread().getId() = "
						+ Thread.currentThread().getId());
			}
		}).start();

结果：

2018-08-28 15:00:42.887 29813-29813/com.example.user.demo E/EventBusDemoActivity: Process.myUid() = 29813
2018-08-28 15:00:42.887 29813-29813/com.example.user.demo E/EventBusDemoActivity: Process.myPid() = 29813
2018-08-28 15:00:42.887 29813-29813/com.example.user.demo E/EventBusDemoActivity: Process.myTid() = 29813
2018-08-28 15:00:42.888 29813-29813/com.example.user.demo E/EventBusDemoActivity: Thread.currentThread().getId() = 1
2018-08-28 15:00:42.888 29813-29813/com.example.user.demo E/EventBusDemoActivity: getMainLooper().getThread().getId() = 1
2018-08-28 15:00:42.888 29813-29813/com.example.user.demo E/EventBusDemoActivity: ((getApplication().getMainLooper()).getThread()).getId() = 1
2018-08-28 15:00:42.888 29813-29813/com.example.user.demo E/EventBusDemoActivity: getTaskId() = 113
2018-08-28 15:00:42.888 29813-29813/com.example.user.demo E/EventBusDemoActivity: getApplicationInfo().uid = 10085
2018-08-28 15:00:42.888 29813-29813/com.example.user.demo E/EventBusDemoActivity: getApplicationInfo().processName = com.example.user.demo
2018-08-28 15:00:42.888 29813-29813/com.example.user.demo E/EventBusDemoActivity: Activity.toString:com.example.user.demo.EventBusDemoActivity$1@d500b7a
2018-08-28 15:00:42.888 29813-29832/com.example.user.demo E/EventBusDemoActivity: Thread.currentThread().getId() = 885