Prefer injecting preferences instead of using PreferenceManager directly (#2073)

# Description
Prefer injecting preferences instead of using
`PreferenceManager.getDefaultSharedPreferences(context)` directly.

# Changes
* replace `PreferenceManager.getDefaultSharedPreferences(context)` by
injecting SharedPreferences instead

Author: adamszewe

app/src/main/java/com/nutomic/syncthingandroid/DaggerComponent.java

@@ -4,6 +4,8 @@
 import com.nutomic.syncthingandroid.activities.FolderPickerActivity;
 import com.nutomic.syncthingandroid.activities.MainActivity;
 import com.nutomic.syncthingandroid.activities.SettingsActivity;
+import com.nutomic.syncthingandroid.activities.ShareActivity;
+import com.nutomic.syncthingandroid.activities.ThemedAppCompatActivity;
 import com.nutomic.syncthingandroid.receiver.AppConfigReceiver;
 import com.nutomic.syncthingandroid.service.RunConditionMonitor;
 import com.nutomic.syncthingandroid.service.EventProcessor;
@@ -34,4 +36,6 @@ public interface DaggerComponent {
     void inject(AppConfigReceiver appConfigReceiver);
     void inject(RestApi restApi);
     void inject(SettingsActivity.SettingsFragment fragment);
+    void inject(ShareActivity activity);
+    void inject(ThemedAppCompatActivity activity);
 }

app/src/main/java/com/nutomic/syncthingandroid/activities/FirstStartActivity.java

@@ -21,7 +21,6 @@
 import androidx.viewpager.widget.PagerAdapter;
 import androidx.viewpager.widget.ViewPager;
 
-import android.preference.PreferenceManager;
 import android.provider.Settings;
 import android.text.Html;
 import android.util.Log;
@@ -240,7 +239,7 @@ private boolean shouldSkipSlide(Slide slide) {
             case API_LEVEL_30:
                 // Skip if running as root, as that circumvents any Android FS restrictions.
                 return upgradedToApiLevel30()
-                        || PreferenceManager.getDefaultSharedPreferences(this).getBoolean(Constants.PREF_USE_ROOT, false);
+                        || mPreferences.getBoolean(Constants.PREF_USE_ROOT, false);
             case NOTIFICATION:
                 return isNotificationPermissionGranted();
 

app/src/main/java/com/nutomic/syncthingandroid/activities/FolderPickerActivity.java

@@ -6,11 +6,10 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
 import android.os.IBinder;
-import android.preference.PreferenceManager;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.core.content.ContextCompat;
@@ -42,6 +41,8 @@
 import java.util.Collections;
 import java.util.Iterator;
 
+import javax.inject.Inject;
+
 /**
  * Activity that allows selecting a directory in the local file system.
  */
@@ -68,6 +69,9 @@ public class FolderPickerActivity extends SyncthingActivity
      */
     private File mLocation;
 
+    @Inject
+    SharedPreferences mPreferences;
+
     public static Intent createIntent(Context context, String initialDirectory, @Nullable String rootDirectory) {
         Intent intent = new Intent(context, FolderPickerActivity.class);
 
@@ -103,7 +107,7 @@ protected void onCreate(Bundle savedInstanceState) {
             displayRoot();
         }
 
-        Boolean prefUseRoot = PreferenceManager.getDefaultSharedPreferences(this).getBoolean(Constants.PREF_USE_ROOT, false);
+        Boolean prefUseRoot = mPreferences.getBoolean(Constants.PREF_USE_ROOT, false);
         if (!prefUseRoot) {
             Toast.makeText(this, R.string.kitkat_external_storage_warning, Toast.LENGTH_LONG)
                     .show();
@@ -133,8 +137,7 @@ private void populateRoots() {
             roots.add(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS));
 
             // Add paths that might not be accessible to Syncthing.
-            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
-            if (sp.getBoolean("advanced_folder_picker", false)) {
+            if (mPreferences.getBoolean("advanced_folder_picker", false)) {
                 Collections.addAll(roots, new File("/storage/").listFiles());
                 roots.add(new File("/"));
             }

app/src/main/java/com/nutomic/syncthingandroid/activities/SettingsActivity.java

@@ -12,7 +12,6 @@
 import android.preference.Preference;
 import android.preference.PreferenceGroup;
 import android.preference.PreferenceFragment;
-import android.preference.PreferenceManager;
 import android.preference.PreferenceScreen;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -268,7 +267,6 @@ public void onActivityCreated(Bundle savedInstanceState) {
             mHttpProxyAddress.setOnPreferenceChangeListener(this);
 
             /* Initialize summaries */
-            mPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
             screen.findPreference(Constants.PREF_POWER_SOURCE).setSummary(mPowerSource.getEntry());
             String wifiSsidSummary = TextUtils.join(", ", mPreferences.getStringSet(Constants.PREF_WIFI_SSID_WHITELIST, new HashSet<>()));
             screen.findPreference(Constants.PREF_WIFI_SSID_WHITELIST).setSummary(TextUtils.isEmpty(wifiSsidSummary) ?

app/src/main/java/com/nutomic/syncthingandroid/activities/ShareActivity.java

@@ -5,11 +5,11 @@
 import android.app.ProgressDialog;
 import android.content.ContentResolver;
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.preference.PreferenceManager;
 import android.provider.MediaStore;
 import android.text.TextUtils;
 import android.util.Log;
@@ -23,6 +23,7 @@
 
 import com.google.common.io.Files;
 import com.nutomic.syncthingandroid.R;
+import com.nutomic.syncthingandroid.SyncthingApp;
 import com.nutomic.syncthingandroid.databinding.ActivityShareBinding;
 import com.nutomic.syncthingandroid.model.Folder;
 import com.nutomic.syncthingandroid.service.SyncthingService;
@@ -40,6 +41,8 @@
 import java.util.List;
 import java.util.Map;
 
+import javax.inject.Inject;
+
 /**
  * Shares incoming files to syncthing folders.
  * <p>
@@ -60,6 +63,9 @@ public class ShareActivity extends StateDialogActivity
 
     private ActivityShareBinding binding;
 
+    @Inject
+    SharedPreferences mPreferences;
+
     @Override
     public void onServiceStateChange(SyncthingService.State currentState) {
         if (currentState != SyncthingService.State.ACTIVE || getApi() == null)
@@ -69,8 +75,7 @@ public void onServiceStateChange(SyncthingService.State currentState) {
 
         // Get the index of the previously selected folder.
         int folderIndex = 0;
-        String savedFolderId = PreferenceManager.getDefaultSharedPreferences(this)
-                .getString(PREF_PREVIOUSLY_SELECTED_SYNCTHING_FOLDER, "");
+        String savedFolderId = mPreferences.getString(PREF_PREVIOUSLY_SELECTED_SYNCTHING_FOLDER, "");
         for (Folder folder : folders) {
             if (folder.id.equals(savedFolderId)) {
                 folderIndex = folders.indexOf(folder);
@@ -102,6 +107,7 @@ protected void onPostCreate(Bundle savedInstanceState) {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        ((SyncthingApp) getApplication()).component().inject(this);
         binding = ActivityShareBinding.inflate(getLayoutInflater());
         setContentView(binding.getRoot());
 
@@ -266,8 +272,7 @@ private String getSavedSubDirectory() {
         String savedSubDirectory = "";
 
         if (selectedFolder != null) {
-            savedSubDirectory = PreferenceManager.getDefaultSharedPreferences(this)
-                    .getString(PREF_FOLDER_SAVED_SUBDIRECTORY + selectedFolder.id, "");
+            savedSubDirectory = mPreferences.getString(PREF_FOLDER_SAVED_SUBDIRECTORY + selectedFolder.id, "");
         }
 
         return savedSubDirectory;
@@ -362,7 +367,7 @@ protected void onPause() {
         super.onPause();
         if (mFoldersSpinner.getSelectedItem() != null) {
             Folder selectedFolder = (Folder) mFoldersSpinner.getSelectedItem();
-            PreferenceManager.getDefaultSharedPreferences(this).edit()
+            mPreferences.edit()
                     .putString(PREF_PREVIOUSLY_SELECTED_SYNCTHING_FOLDER, selectedFolder.id)
                     .apply();
         }
@@ -379,7 +384,7 @@ protected void onActivityResult(int requestCode, int resultCode, Intent data) {
             subDirectory = subDirectory.replace(folderDirectory, "");
             mSubDirectoryTextView.setText(subDirectory);
 
-            PreferenceManager.getDefaultSharedPreferences(this)
+            mPreferences
                     .edit().putString(PREF_FOLDER_SAVED_SUBDIRECTORY + selectedFolder.id, subDirectory)
                     .apply();
         }

app/src/main/java/com/nutomic/syncthingandroid/activities/ThemedAppCompatActivity.java

@@ -2,25 +2,30 @@
 
 import android.content.SharedPreferences;
 import android.os.Bundle;
-import android.preference.PreferenceManager;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.app.AppCompatDelegate;
 
+import com.nutomic.syncthingandroid.SyncthingApp;
 import com.nutomic.syncthingandroid.service.Constants;
 
+import javax.inject.Inject;
+
 /**
  * Provides a themed instance of AppCompatActivity.
  */
 public class ThemedAppCompatActivity extends AppCompatActivity {
 
     private static final String FOLLOW_SYSTEM = "-1";
 
+    @Inject
+    SharedPreferences mPreferences;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        ((SyncthingApp) getApplication()).component().inject(this);
         // Load theme.
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
         //For api level below 28, Follow system fall backs to light mode
-        Integer prefAppTheme = Integer.parseInt(prefs.getString(Constants.PREF_APP_THEME, FOLLOW_SYSTEM));
+        Integer prefAppTheme = Integer.parseInt(mPreferences.getString(Constants.PREF_APP_THEME, FOLLOW_SYSTEM));
         AppCompatDelegate.setDefaultNightMode(prefAppTheme);
         super.onCreate(savedInstanceState);
     }