更新 MainActivity.java

app/src/main/java/com/nbee/echolink/MainActivity.java

@@ -10,9 +10,13 @@ import android.view.View;
 import android.widget.TextView;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.work.ExistingPeriodicWorkPolicy;
+import androidx.work.PeriodicWorkRequest;
+import androidx.work.WorkManager;
 
 import com.nbee.echolink.service.MonitorService;
 import com.nbee.echolink.utils.BatteryOptimizationUtil;
+import com.nbee.echolink.utils.HeartbeatWorker;
 import com.nbee.echolink.utils.PermissionUtils;
 import com.nbee.echolink.utils.ShellUtils;
 
@@ -20,6 +24,7 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
+import java.util.concurrent.TimeUnit;
 
 import timber.log.Timber;
 
@@ -98,5 +103,4 @@ public class MainActivity extends AppCompatActivity {
             return "读取日志文件时出错";
         }
     }
-
 }