无法检测通过服务启动或打开的应用程序

Question

我正在尝试构建一个应用程序，我的应用程序在后台运行，并检测用户何时启动任何其他应用程序。

例如，如果用户启动Google Play商店，那么我想展示Toast＆＃34; Google Play应用已推出＆＃34;

以下是我所关注的SO链接：https://stackoverflow.com/a/11346800

每当我点击任何应用程序时，例如：Google Play应用程序或Gmail应用程序或任何其他应用程序。我没有收到任何Toast消息，说明＆＃34; APPNAME应用程序已启动＆＃34;

我在代码中遗漏的内容，以下是我的服务类的完整代码：

public class NotifyService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {
        Toast.makeText(this, " MyService Created ", Toast.LENGTH_LONG).show();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(this, " MyService Started", Toast.LENGTH_LONG).show();
        final int currentId = startId;

        Runnable r = new Runnable() {
            public void run() {

                for (int i = 0; i < 3; i++) {
                    long endTime = System.currentTimeMillis() + 10 * 1000;

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

                                Process mLogcatProc = null;
                                BufferedReader reader = null;
                                mLogcatProc = Runtime.getRuntime().exec(new String[]{"logcat", "-d"});

                                reader = new BufferedReader(new InputStreamReader(mLogcatProc.getInputStream()));

                                String line;
                                final StringBuilder log = new StringBuilder();
                                String separator = System.getProperty("line.separator");

                                while ((line = reader.readLine()) != null)
                                {
                                    log.append(line);
                                    log.append(separator);
                                }
                                String w = log.toString();
                                Toast.makeText(getApplicationContext(),w, Toast.LENGTH_LONG).show();

                            } catch (Exception e) {
                            }
                        }
                    }
                    Log.d("ServiceRunning:", "Service Running");

                }
                stopSelf();
            }
        };

        Thread t = new Thread(r);
        t.start();
        return Service.START_STICKY;
    }

    @Override
    public void onDestroy() {
        Toast.makeText(this, "MyService Stopped", Toast.LENGTH_LONG).show();
    }

}

MainActivity.java：

public class MainActivity extends AppCompatActivity {

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

        startService(new Intent(MainActivity.this, NotifyService.class));
    }
}