android: Consolidate getPrefActivity into FragmentUtils

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>
[Samuel: Changed static to non-static import]
Signed-off-by: Samuel Holland <samuel@sholland.org>

app/src/main/java/com/wireguard/android/preference/LogExporterPreference.java

@@ -14,12 +14,11 @@ import android.support.design.widget.Snackbar;
 import android.support.v7.preference.Preference;
 import android.util.AttributeSet;
 import android.util.Log;
-import android.view.ContextThemeWrapper;
 
 import com.wireguard.android.Application;
 import com.wireguard.android.R;
-import com.wireguard.android.activity.SettingsActivity;
 import com.wireguard.android.util.ExceptionLoggers;
+import com.wireguard.android.util.FragmentUtils;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -40,16 +39,6 @@ public class LogExporterPreference extends Preference {
         super(context, attrs);
     }
 
-    private static SettingsActivity getPrefActivity(final Preference preference) {
-        final Context context = preference.getContext();
-        if (context instanceof ContextThemeWrapper) {
-            if (((ContextThemeWrapper) context).getBaseContext() instanceof SettingsActivity) {
-                return ((SettingsActivity) ((ContextThemeWrapper) context).getBaseContext());
-            }
-        }
-        return null;
-    }
-
     private void exportLog() {
         Application.getAsyncWorker().supplyAsync(() -> {
             final File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
@@ -90,7 +79,7 @@ public class LogExporterPreference extends Preference {
             final String message = getContext().getString(R.string.log_export_error, error);
             Log.e(TAG, message, throwable);
             Snackbar.make(
-                    getPrefActivity(this).findViewById(android.R.id.content),
+                    FragmentUtils.getPrefActivity(this).findViewById(android.R.id.content),
                     message, Snackbar.LENGTH_LONG).show();
             setEnabled(true);
         } else {
@@ -113,7 +102,7 @@ public class LogExporterPreference extends Preference {
 
     @Override
     protected void onClick() {
-        getPrefActivity(this).ensurePermissions(
+        FragmentUtils.getPrefActivity(this).ensurePermissions(
                 new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                 (permissions, granted) -> {
                     if (granted.length > 0 && granted[0] == PackageManager.PERMISSION_GRANTED) {

app/src/main/java/com/wireguard/android/preference/ZipExporterPreference.java

@@ -14,13 +14,12 @@ import android.support.design.widget.Snackbar;
 import android.support.v7.preference.Preference;
 import android.util.AttributeSet;
 import android.util.Log;
-import android.view.ContextThemeWrapper;
 
 import com.wireguard.android.Application;
 import com.wireguard.android.R;
-import com.wireguard.android.activity.SettingsActivity;
 import com.wireguard.android.model.Tunnel;
 import com.wireguard.android.util.ExceptionLoggers;
+import com.wireguard.android.util.FragmentUtils;
 import com.wireguard.config.Config;
 
 import java.io.File;
@@ -47,16 +46,6 @@ public class ZipExporterPreference extends Preference {
         super(context, attrs);
     }
 
-    private static SettingsActivity getPrefActivity(final Preference preference) {
-        final Context context = preference.getContext();
-        if (context instanceof ContextThemeWrapper) {
-            if (((ContextThemeWrapper) context).getBaseContext() instanceof SettingsActivity) {
-                return ((SettingsActivity) ((ContextThemeWrapper) context).getBaseContext());
-            }
-        }
-        return null;
-    }
-
     private void exportZip() {
         final List<Tunnel> tunnels = new ArrayList<>(Application.getTunnelManager().getTunnels());
         final List<CompletableFuture<Config>> futureConfigs = new ArrayList<>(tunnels.size());
@@ -96,7 +85,7 @@ public class ZipExporterPreference extends Preference {
             final String message = getContext().getString(R.string.zip_export_error, error);
             Log.e(TAG, message, throwable);
             Snackbar.make(
-                    getPrefActivity(this).findViewById(android.R.id.content),
+                    FragmentUtils.getPrefActivity(this).findViewById(android.R.id.content),
                     message, Snackbar.LENGTH_LONG).show();
             setEnabled(true);
         } else {
@@ -119,7 +108,7 @@ public class ZipExporterPreference extends Preference {
 
     @Override
     protected void onClick() {
-        getPrefActivity(this).ensurePermissions(
+        FragmentUtils.getPrefActivity(this).ensurePermissions(
                 new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                 (permissions, granted) -> {
                     if (granted.length > 0 && granted[0] == PackageManager.PERMISSION_GRANTED) {

app/src/main/java/com/wireguard/android/util/FragmentUtils.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright © 2018 Harsh Shandilya <msfjarvis@gmail.com>
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+package com.wireguard.android.util;
+
+import android.content.Context;
+import android.support.v7.preference.Preference;
+import android.view.ContextThemeWrapper;
+
+import com.wireguard.android.activity.SettingsActivity;
+
+public class FragmentUtils {
+
+    public static SettingsActivity getPrefActivity(final Preference preference) {
+        final Context context = preference.getContext();
+        if (context instanceof ContextThemeWrapper) {
+            if (((ContextThemeWrapper) context).getBaseContext() instanceof SettingsActivity) {
+                return ((SettingsActivity) ((ContextThemeWrapper) context).getBaseContext());
+            }
+        }
+        return null;
+    }
+}