Refactor DeviceStateHolder and receivers

src/main/java/com/nutomic/syncthingandroid/receiver/BatteryReceiver.java

@@ -5,6 +5,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.BatteryManager;
+import android.support.v4.content.LocalBroadcastManager;
 
 import com.nutomic.syncthingandroid.service.DeviceStateHolder;
 import com.nutomic.syncthingandroid.service.SyncthingService;
@@ -24,9 +25,13 @@ public class BatteryReceiver extends BroadcastReceiver {
             return;
 
         boolean isCharging = Intent.ACTION_POWER_CONNECTED.equals(intent.getAction());
-        Intent i = new Intent(context, SyncthingService.class);
+        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+        Intent i = new Intent(DeviceStateHolder.ACTION_DEVICE_STATE_CHANGED);
         i.putExtra(DeviceStateHolder.EXTRA_IS_CHARGING, isCharging);
-        context.startService(i);
+        lbm.sendBroadcast(i);
+
+        // Make sure service is running.
+        context.startService(new Intent(context, SyncthingService.class));
     }
 
     /**
@@ -38,9 +43,10 @@ public class BatteryReceiver extends BroadcastReceiver {
         boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                 status == BatteryManager.BATTERY_STATUS_FULL;
 
-        Intent intent = new Intent(context, SyncthingService.class);
+        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+        Intent intent = new Intent(DeviceStateHolder.ACTION_DEVICE_STATE_CHANGED);
         intent.putExtra(DeviceStateHolder.EXTRA_IS_CHARGING, isCharging);
-        context.startService(intent);
+        lbm.sendBroadcast(intent);
     }
 
 }

src/main/java/com/nutomic/syncthingandroid/receiver/NetworkReceiver.java

@@ -7,6 +7,8 @@ import android.content.Intent;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
 import android.os.Build;
+import android.support.v4.content.LocalBroadcastManager;
+import android.util.Log;
 
 import com.nutomic.syncthingandroid.service.DeviceStateHolder;
 import com.nutomic.syncthingandroid.service.SyncthingService;
@@ -37,9 +39,13 @@ public class NetworkReceiver extends BroadcastReceiver {
         boolean isNetworkMetered = (Build.VERSION.SDK_INT >= 16) ? cm.isActiveNetworkMetered() : false;
         boolean isAllowedConnection =  isOffline || (isWifi && !isNetworkMetered);
 
-        Intent intent = new Intent(context, SyncthingService.class);
+        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+        Intent intent = new Intent(DeviceStateHolder.ACTION_DEVICE_STATE_CHANGED);
         intent.putExtra(DeviceStateHolder.EXTRA_IS_ALLOWED_NETWORK_CONNECTION, isAllowedConnection);
-        context.startService(intent);
+        lbm.sendBroadcast(intent);
+
+        // Make sure service is running.
+        context.startService(new Intent(context, SyncthingService.class));
     }
 
 }

src/main/java/com/nutomic/syncthingandroid/receiver/PowerSaveModeChangedReceiver.java

@@ -0,0 +1,31 @@
+package com.nutomic.syncthingandroid.receiver;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+import android.os.PowerManager;
+import android.support.v4.content.LocalBroadcastManager;
+
+import com.nutomic.syncthingandroid.service.DeviceStateHolder;
+import com.nutomic.syncthingandroid.service.SyncthingService;
+
+public class PowerSaveModeChangedReceiver extends BroadcastReceiver {
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        if (!PowerManager.ACTION_POWER_SAVE_MODE_CHANGED.equals(intent.getAction()))
+            return;
+
+        updatePowerSavingState(context);
+    }
+
+    public static void updatePowerSavingState(Context context) {
+        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+        boolean isPowerSaveMode = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && pm.isPowerSaveMode();
+        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+        Intent intent = new Intent(DeviceStateHolder.ACTION_DEVICE_STATE_CHANGED);
+        intent.putExtra(DeviceStateHolder.EXTRA_IS_POWER_SAVING, isPowerSaveMode);
+        lbm.sendBroadcast(intent);
+    }
+}

src/main/java/com/nutomic/syncthingandroid/service/DeviceStateHolder.java

@@ -1,31 +1,40 @@
 package com.nutomic.syncthingandroid.service;
 
+import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.os.Build;
 import android.os.PowerManager;
 import android.preference.PreferenceManager;
+import android.support.v4.content.LocalBroadcastManager;
 import android.util.Log;
 
+import com.google.common.base.Joiner;
 import com.nutomic.syncthingandroid.receiver.BatteryReceiver;
 import com.nutomic.syncthingandroid.receiver.NetworkReceiver;
+import com.nutomic.syncthingandroid.receiver.PowerSaveModeChangedReceiver;
 
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
 
 /**
  * Holds information about the current wifi and charging state of the device.
  *
- * This information is actively read on construction, and then updated from intents that are passed
+ * This information is actively read on instance creation, and then updated from intents
- * to {@link #update(android.content.Intent)}.
+ * that are passed with {@link #ACTION_DEVICE_STATE_CHANGED}.
  */
 public class DeviceStateHolder {
 
     private static final String TAG = "DeviceStateHolder";
 
+    public static final String ACTION_DEVICE_STATE_CHANGED =
+            "com.nutomic.syncthingandroid.syncthing.DeviceStateHolder.DEVICE_STATE_CHANGED";
+
     /**
      * Intent extra containing a boolean saying whether wifi is connected or not.
      */
@@ -39,29 +48,53 @@ public class DeviceStateHolder {
     public static final String EXTRA_IS_CHARGING =
             "com.nutomic.syncthingandroid.syncthing.DeviceStateHolder.IS_CHARGING";
 
+    public static final String EXTRA_IS_POWER_SAVING =
+            "com.nutomic.syncthingandroid.syncthing.DeviceStateHolder.IS_POWER_SAVING";
+
+    public interface OnDeviceStateChangedListener {
+        void onDeviceStateChanged();
+    }
+
     private final Context mContext;
     private final SharedPreferences mPreferences;
+    private final LocalBroadcastManager mBroadcastManager;
+    private final DeviceStateChangedReceiver mReceiver = new DeviceStateChangedReceiver();
+    private final OnDeviceStateChangedListener mListener;
 
     private boolean mIsAllowedNetworkConnection = false;
     private String mWifiSsid;
     private boolean mIsCharging = false;
+    private boolean mIsPowerSaving = true;
 
-    public DeviceStateHolder(Context context) {
+    public DeviceStateHolder(Context context, OnDeviceStateChangedListener listener) {
         mContext = context;
         mPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
+        mBroadcastManager = LocalBroadcastManager.getInstance(mContext);
+        mBroadcastManager.registerReceiver(mReceiver, new IntentFilter(ACTION_DEVICE_STATE_CHANGED));
+        mListener = listener;
 
         BatteryReceiver.updateInitialChargingStatus(mContext);
         NetworkReceiver.updateNetworkStatus(mContext);
+        PowerSaveModeChangedReceiver.updatePowerSavingState(mContext);
     }
 
-    public void update(Intent intent) {
+    public void shutdown() {
-        mIsAllowedNetworkConnection =
+        mBroadcastManager.unregisterReceiver(mReceiver);
-                intent.getBooleanExtra(EXTRA_IS_ALLOWED_NETWORK_CONNECTION, mIsAllowedNetworkConnection);
+    }
-        mIsCharging = intent.getBooleanExtra(EXTRA_IS_CHARGING, mIsCharging);
-        Log.i(TAG, "State updated, allowed network connection: " + mIsAllowedNetworkConnection +
-                ", charging: " + mIsCharging);
 
-        updateWifiSsid();
+    private class DeviceStateChangedReceiver extends BroadcastReceiver {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            mIsAllowedNetworkConnection =
+                    intent.getBooleanExtra(EXTRA_IS_ALLOWED_NETWORK_CONNECTION, mIsAllowedNetworkConnection);
+            mIsCharging = intent.getBooleanExtra(EXTRA_IS_CHARGING, mIsCharging);
+            mIsPowerSaving = intent.getBooleanExtra(EXTRA_IS_POWER_SAVING, mIsPowerSaving);
+            Log.i(TAG, "State updated, allowed network connection: " + mIsAllowedNetworkConnection +
+                    ", charging: " + mIsCharging + ", power saving: " + mIsPowerSaving);
+
+            updateWifiSsid();
+            mListener.onDeviceStateChanged();
+        }
     }
 
     private void updateWifiSsid() {
@@ -69,7 +102,7 @@ public class DeviceStateHolder {
         WifiManager wifiManager =
                 (WifiManager) mContext.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
         WifiInfo wifiInfo = wifiManager.getConnectionInfo();
-        // may be null, if WiFi has been turned off in meantime
+        // May be null, if WiFi has been turned off in meantime.
         if (wifiInfo != null) {
             mWifiSsid = wifiInfo.getSSID();
         }
@@ -78,24 +111,23 @@ public class DeviceStateHolder {
     /**
      * Determines if Syncthing should currently run.
      */
-    public boolean shouldRun() {
+    boolean shouldRun() {
-        PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
+        boolean prefRespectPowerSaving = mPreferences.getBoolean("respect_battery_saving", true);
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
+        if (prefRespectPowerSaving && mIsPowerSaving)
-                mPreferences.getBoolean("respect_battery_saving", true) &&
-                pm.isPowerSaveMode()) {
             return false;
-        }
+
-        else if (SyncthingService.alwaysRunInBackground(mContext)) {
+        if (SyncthingService.alwaysRunInBackground(mContext)) {
-            // Check wifi/charging state against preferences and start if ok.
             boolean prefStopMobileData = mPreferences.getBoolean(SyncthingService.PREF_SYNC_ONLY_WIFI, false);
             boolean prefStopNotCharging = mPreferences.getBoolean(SyncthingService.PREF_SYNC_ONLY_CHARGING, false);
 
-            return (mIsCharging || !prefStopNotCharging) &&
+            if (prefStopMobileData && !isWhitelistedNetworkConnection())
-                    (!prefStopMobileData || isWhitelistedNetworkConnection());
+                return false;
-        }
+
-        else {
+            if (prefStopNotCharging && !mIsCharging)
-            return true;
+                return false;
         }
+
+        return true;
     }
 
     private boolean isWhitelistedNetworkConnection() {

src/main/java/com/nutomic/syncthingandroid/service/SyncthingService.java

@@ -28,6 +28,7 @@ import com.nutomic.syncthingandroid.activities.FirstStartActivity;
 import com.nutomic.syncthingandroid.http.PollWebGuiAvailableTask;
 import com.nutomic.syncthingandroid.model.Folder;
 import com.nutomic.syncthingandroid.receiver.NetworkReceiver;
+import com.nutomic.syncthingandroid.receiver.PowerSaveModeChangedReceiver;
 import com.nutomic.syncthingandroid.util.ConfigXml;
 import com.nutomic.syncthingandroid.util.FolderObserver;
 
@@ -97,18 +98,6 @@ public class SyncthingService extends Service implements
 
     private static final int NOTIFICATION_ACTIVE = 1;
 
-    private ConfigXml mConfig;
-
-    private RestApi mApi;
-
-    private EventProcessor mEventProcessor;
-
-    private final LinkedList<FolderObserver> mObservers = new LinkedList<>();
-
-    private final SyncthingServiceBinder mBinder = new SyncthingServiceBinder(this);
-
-    private final NetworkReceiver mNetworkReceiver = new NetworkReceiver();
-
     /**
      * Callback for when the Syncthing web interface becomes first available after service start.
      */
@@ -126,13 +115,6 @@ public class SyncthingService extends Service implements
     private final HashSet<OnApiChangeListener> mOnApiChangeListeners =
             new HashSet<>();
 
-    private final BroadcastReceiver mPowerSaveModeChangedReceiver = new BroadcastReceiver() {
-        @Override
-        public void onReceive(Context context, Intent intent) {
-            updateState();
-        }
-    };
-
     /**
      * Indicates the current state of SyncthingService and of Syncthing itself.
      */
@@ -151,6 +133,19 @@ public class SyncthingService extends Service implements
 
     private State mCurrentState = State.INIT;
 
+    private ConfigXml mConfig;
+
+    private RestApi mApi;
+
+    private EventProcessor mEventProcessor;
+
+    private final LinkedList<FolderObserver> mObservers = new LinkedList<>();
+
+    private final SyncthingServiceBinder mBinder = new SyncthingServiceBinder(this);
+
+    private final NetworkReceiver mNetworkReceiver = new NetworkReceiver();
+    private final BroadcastReceiver mPowerSaveModeChangedReceiver = new PowerSaveModeChangedReceiver();
+
     /**
      * Object that can be locked upon when accessing mCurrentState
      * Currently used to male onDestroy() and PollWebGuiAvailableTaskImpl.onPostExcecute() tread-safe
@@ -184,9 +179,6 @@ public class SyncthingService extends Service implements
                 new SyncthingRunnable(this, SyncthingRunnable.Command.reset).run();
                 new StartupTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
             });
-        } else {
-            mDeviceStateHolder.update(intent);
-            updateState();
         }
         return START_STICKY;
     }
@@ -285,7 +277,7 @@ public class SyncthingService extends Service implements
         super.onCreate();
         PRNGFixes.apply();
 
-        mDeviceStateHolder = new DeviceStateHolder(SyncthingService.this);
+        mDeviceStateHolder = new DeviceStateHolder(SyncthingService.this, this::updateState);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             registerReceiver(mPowerSaveModeChangedReceiver,
                     new IntentFilter(PowerManager.ACTION_POWER_SAVE_MODE_CHANGED));
@@ -393,6 +385,7 @@ public class SyncthingService extends Service implements
 
         SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
         sp.unregisterOnSharedPreferenceChangeListener(this);
+        mDeviceStateHolder.shutdown();
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
             unregisterReceiver(mPowerSaveModeChangedReceiver);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)