Remove unneeded compatibility classes, functions, library.

This should fix the F-Droid build.

build.gradle

@@ -16,9 +16,6 @@ apply plugin: 'com.github.ben-manes.versions'
 
 repositories {
     mavenCentral()
-    maven {
-        url 'https://raw.github.com/kolavar/android-support-v4-preferencefragment/master/maven-repository/'
-    }
     maven {
         url 'http://jcenter.bintray.com'
     }
@@ -29,7 +26,6 @@ dependencies {
     compile 'com.android.support:appcompat-v7:23.1.0'
     compile 'com.android.support:design:23.1.0'
     compile 'com.android.support:appcompat-v7:23.1.0'
-    compile 'com.android.support:support-v4-preferencefragment:1.0.0@aar'
     androidTestCompile 'com.squareup.okhttp:mockwebserver:2.4.0'
 }
 

settings.gradle

@@ -1,2 +0,0 @@
-include ':android-support-v4-preferencefragment'
-project(':android-support-v4-preferencefragment').projectDir = new File('libraries/android-support-v4-preferencefragment')

src/main/java/com/nutomic/syncthingandroid/activities/LogActivity.java

@@ -3,14 +3,12 @@ package com.nutomic.syncthingandroid.activities;
 import android.content.Intent;
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.support.v4.app.ActivityCompat;
+import android.support.v4.view.MenuItemCompat;
 import android.support.v7.widget.ShareActionProvider;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
-
-import android.support.v4.view.MenuItemCompat;
 import android.widget.ScrollView;
 import android.widget.TextView;
 
@@ -44,7 +42,7 @@ public class LogActivity extends SyncthingActivity {
 
         if (savedInstanceState != null) {
             mSyncthingLog = savedInstanceState.getBoolean("syncthingLog");
-            ActivityCompat.invalidateOptionsMenu(this);
+            invalidateOptionsMenu();
         }
 
         mLog = (TextView) findViewById(R.id.log);

src/main/java/com/nutomic/syncthingandroid/activities/MainActivity.java

@@ -17,7 +17,6 @@ import android.support.design.widget.TabLayout;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentPagerAdapter;
-import android.support.v4.view.GravityCompat;
 import android.support.v4.view.ViewPager;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBar;
@@ -25,6 +24,7 @@ import android.support.v7.app.ActionBarDrawerToggle;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.TypedValue;
+import android.view.Gravity;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
@@ -128,10 +128,7 @@ public class MainActivity extends SyncthingActivity
         PackageManager pm = getPackageManager();
         long firstInstallTime = 0;
         try {
-            // No info is available on Froyo.
+            firstInstallTime = pm.getPackageInfo(getPackageName(), 0).firstInstallTime;
-            firstInstallTime = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD)
-                    ? pm.getPackageInfo(getPackageName(), 0).firstInstallTime
-                    : 0;
         } catch (PackageManager.NameNotFoundException e) {
             Log.w(TAG, "This should never happen", e);
         }
@@ -324,7 +321,7 @@ public class MainActivity extends SyncthingActivity
      * Closes the drawer. Use when navigating away from activity.
      */
     public void closeDrawer() {
-        mDrawerLayout.closeDrawer(GravityCompat.START);
+        mDrawerLayout.closeDrawer(Gravity.LEFT);
     }
 
     /**
@@ -333,8 +330,8 @@ public class MainActivity extends SyncthingActivity
     @Override
     public boolean onKeyDown(int keyCode, KeyEvent e) {
         if (keyCode == KeyEvent.KEYCODE_MENU) {
-            if (!mDrawerLayout.isDrawerOpen(GravityCompat.START))
+            if (!mDrawerLayout.isDrawerOpen(Gravity.LEFT))
-                mDrawerLayout.openDrawer(GravityCompat.START);
+                mDrawerLayout.openDrawer(Gravity.RIGHT);
             else
                 closeDrawer();
 

src/main/java/com/nutomic/syncthingandroid/activities/RestartActivity.java

@@ -1,6 +1,5 @@
 package com.nutomic.syncthingandroid.activities;
 
-import android.annotation.TargetApi;
 import android.app.AlertDialog;
 import android.app.Notification;
 import android.app.NotificationManager;
@@ -25,7 +24,6 @@ public class RestartActivity extends SyncthingActivity {
     public static final int NOTIFICATION_RESTART = 2;
 
     @Override
-    @TargetApi(11)
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 

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

@@ -1,8 +1,8 @@
 package com.nutomic.syncthingandroid.activities;
 
+import android.app.Fragment;
+import android.app.FragmentManager;
 import android.os.Bundle;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentManager;
 
 import com.nutomic.syncthingandroid.R;
 import com.nutomic.syncthingandroid.fragments.DeviceFragment;
@@ -38,7 +38,7 @@ public class SettingsActivity extends SyncthingActivity {
 
         setContentView(R.layout.activity_settings);
 
-        FragmentManager fm = getSupportFragmentManager();
+        FragmentManager fm = getFragmentManager();
         if (savedInstanceState != null) {
             mFragment = fm.getFragment(savedInstanceState,
                     savedInstanceState.getString("fragment_name"));
@@ -79,7 +79,7 @@ public class SettingsActivity extends SyncthingActivity {
         super.onSaveInstanceState(outState);
         String fragmentClassName = mFragment.getClass().getName();
         outState.putString("fragment_name", fragmentClassName);
-        FragmentManager fm = getSupportFragmentManager();
+        FragmentManager fm = getFragmentManager();
         fm.putFragment(outState, fragmentClassName, mFragment);
     }
 

src/main/java/com/nutomic/syncthingandroid/fragments/DeviceFragment.java

@@ -1,10 +1,10 @@
 package com.nutomic.syncthingandroid.fragments;
 
+import android.app.Fragment;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.SwitchCompat;
 import android.text.Editable;

src/main/java/com/nutomic/syncthingandroid/fragments/FolderFragment.java

@@ -2,11 +2,11 @@ package com.nutomic.syncthingandroid.fragments;
 
 import android.app.Activity;
 import android.app.AlertDialog;
+import android.app.Fragment;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
 import android.support.v7.widget.SwitchCompat;
 import android.text.Editable;
 import android.text.TextWatcher;
@@ -260,7 +260,8 @@ public class FolderFragment extends Fragment
             addEmptyDeviceListView();
         } else {
             for (RestApi.Device n : devicesList) {
-                addDeviceViewAndSetListener(n, getLayoutInflater(null));
+
+                addDeviceViewAndSetListener(n, LayoutInflater.from(getActivity()));
             }
         }
 

src/main/java/com/nutomic/syncthingandroid/fragments/SettingsFragment.java

@@ -9,10 +9,10 @@ import android.os.Bundle;
 import android.preference.CheckBoxPreference;
 import android.preference.EditTextPreference;
 import android.preference.Preference;
+import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
 import android.preference.PreferenceScreen;
 import android.support.v4.app.NavUtils;
-import android.support.v4.preference.PreferenceFragment;
 import android.text.InputType;
 import android.util.Log;
 import android.view.MenuItem;

src/main/java/com/nutomic/syncthingandroid/fragments/dialog/KeepVersionsDialogFragment.java

@@ -1,10 +1,10 @@
 package com.nutomic.syncthingandroid.fragments.dialog;
 
 import android.app.Dialog;
+import android.app.DialogFragment;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
-import android.support.v4.app.DialogFragment;
 import android.support.v7.app.AlertDialog;
 import android.widget.FrameLayout.LayoutParams;
 import android.widget.NumberPicker;

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

@@ -2,7 +2,6 @@ package com.nutomic.syncthingandroid.syncthing;
 
 import android.app.Activity;
 import android.app.AlertDialog;
-import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;