refactor

app/build.gradle

@@ -106,6 +106,12 @@ dependencies {
     implementation "io.reactivex.rxjava2:rxjava:$rootProject.RXJAVA2_VERSION"
     implementation "io.reactivex.rxjava2:rxandroid:$rootProject.RXANDROID2_VERSION"
 
+    def work_version = "2.7.1"
+    // (Java only)
+    implementation "androidx.work:work-runtime:$work_version"
+    // optional - RxJava2 support
+    implementation "androidx.work:work-rxjava2:$work_version"
+
     // OkHttp
     implementation "com.squareup.okhttp3:okhttp:$OKHTTP_VERSION"
     implementation "com.squareup.okhttp3:logging-interceptor:$OKHTTP_VERSION"

app/src/main/AndroidManifest.xml

@@ -81,12 +81,6 @@
             android:configChanges="orientation|screenSize" />
 
         <!-- service -->
-        <service
-            android:name=".services.MaintainUserStatusService"
-            android:permission="android.permission.BIND_JOB_SERVICE"
-            android:exported="false" />
-        <receiver
-            android:name=".services.AlarmBroadcastReceiver" />
         <!-- aadapt to S8 and Mix2 -->
         <meta-data
             android:name="android.max_aspect"

app/src/main/java/com/zfdang/SMTHApplication.java

@@ -12,6 +12,8 @@
 import com.zfdang.zsmth_android.helpers.GEODatabase;
 import com.zfdang.zsmth_android.newsmth.SMTHHelper;
 import com.zfdang.zsmth_android.newsmth.UserStatus;
+import com.zfdang.zsmth_android.services.UserStatusReceiver;
+
 import okhttp3.OkHttpClient;
 import androidx.multidex.MultiDex;
 
@@ -48,6 +50,9 @@ public class SMTHApplication extends Application {
   public static final String NOTIFICATION_NEW_LIKE = "你有新Like!";
   public static final String NOTIFICATION_LOGIN_LOST = "登录已过期！请重新登录...";
 
+  public static final int INTERVAL_TO_CHECK_MESSAGE = 2; // 2 minutes for interval to check messages
+  public static UserStatusReceiver mUserStatusReceiver = null;
+
   // IP database
   public static GEODatabase geoDB;
 
@@ -59,7 +64,7 @@ protected void attachBaseContext(Context base) {
 
   // current logined user
   public static UserStatus activeUser;
-  public static String displayedUserId;
+  public static String displayedUserId = "guest";
   public static boolean isValidUser() {
     return activeUser != null && !activeUser.getId().equals("guest");
   }

app/src/main/java/com/zfdang/zsmth_android/MainActivity.java

@@ -36,6 +36,10 @@
 import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
+import androidx.work.Data;
+import androidx.work.OneTimeWorkRequest;
+import androidx.work.WorkManager;
+import androidx.work.WorkRequest;
 
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.navigation.NavigationView;
@@ -56,10 +60,11 @@
 import com.zfdang.zsmth_android.models.Topic;
 import com.zfdang.zsmth_android.newsmth.AjaxResponse;
 import com.zfdang.zsmth_android.newsmth.SMTHHelper;
-import com.zfdang.zsmth_android.services.AlarmBroadcastReceiver;
+import com.zfdang.zsmth_android.services.MaintainUserStatusWorker;
 import com.zfdang.zsmth_android.services.UserStatusReceiver;
 
 import java.lang.reflect.Field;
+import java.util.concurrent.TimeUnit;
 
 import io.reactivex.Observer;
 import io.reactivex.android.schedulers.AndroidSchedulers;
@@ -176,10 +181,18 @@ public void onBackStackChanged() {
     setupUserStatusReceiver();
 
     // schedule the periodical background service
-    AlarmBroadcastReceiver.schedule(getApplicationContext(), mReceiver);
+    Data.Builder inputData = new Data.Builder();
+    inputData.putBoolean(MaintainUserStatusWorker.REPEAT, true);
+    WorkRequest userStatusWorkRequest =
+            new OneTimeWorkRequest.Builder(MaintainUserStatusWorker.class)
+                    .setInitialDelay(SMTHApplication.INTERVAL_TO_CHECK_MESSAGE, TimeUnit.MINUTES)
+                    .setInputData(inputData.build())
+                    .build();
+    WorkManager.getInstance(getApplicationContext()).enqueue(userStatusWorkRequest);
+
     // run the background service now
     updateUserStatusNow();
-    UpdateNavigationViewHeader();
+//    UpdateNavigationViewHeader();
 
     if (Settings.getInstance().isFirstRun()) {
       // show info dialog after 5 seconds for the first run
@@ -259,7 +272,10 @@ private void initCircularActionMenu(FloatingActionButton fab) {
 
   // triger the background service right now
   private void updateUserStatusNow() {
-    AlarmBroadcastReceiver.runJobNow(getApplicationContext(), mReceiver);
+    // run worker immediately for once
+    WorkRequest userStatusWorkRequest =
+            new OneTimeWorkRequest.Builder(MaintainUserStatusWorker.class).build();
+    WorkManager.getInstance(getApplicationContext()).enqueue(userStatusWorkRequest);
   }
 
   private void setupUserStatusReceiver() {
@@ -279,6 +295,7 @@ private void setupUserStatusReceiver() {
         }
       }
     });
+    SMTHApplication.mUserStatusReceiver = mReceiver;
   }
 
   private void showNotification(String text) {
@@ -435,12 +452,13 @@ public void UpdateNavigationViewHeader() {
       if (faceURL != null) {
         mAvatar.setImageFromStringURL(faceURL);
       }
+      SMTHApplication.displayedUserId = SMTHApplication.activeUser.getId();
     } else {
       // when user is invalid, set notice to login
       mUsername.setText(getString(R.string.nav_header_click_to_login));
       mAvatar.setImageResource(R.drawable.ic_person_black_48dp);
+      SMTHApplication.displayedUserId = "guest";
     }
-    SMTHApplication.displayedUserId = mUsername.getText().toString();
   }
 
   @Override public void onBackPressed() {
@@ -490,9 +508,6 @@ private void DoubleBackToExit() {
   }
 
   private void quitNow() {
-    // stop background service
-    AlarmBroadcastReceiver.unschedule();
-
     // quit
     finish();
     android.os.Process.killProcess(android.os.Process.myPid());

app/src/main/java/com/zfdang/zsmth_android/newsmth/UserStatus.java

@@ -180,6 +180,7 @@ public void setFace_url(String face_url) {
   }
 
   public String getId() {
+    if (id == null) return "guest";
     return id;
   }