setup Tor at app start, and config immediately when pref is changed

This adds an Application subclass to get the onCreate() method, which is
called once at the first start up of the app, before any Activity starts.
Tor is configured there to ensure it is setup before anything happens.

This also moves the "Use Tor" pref listener to a more appropriate place.

app/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
     <application
+        android:name=".App"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:logo="@mipmap/ic_launcher"

app/src/main/java/org/schabi/newpipe/App.java

@@ -0,0 +1,32 @@
+package org.schabi.newpipe;
+
+import android.app.Application;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+
+import info.guardianproject.netcipher.NetCipher;
+import info.guardianproject.netcipher.proxy.OrbotHelper;
+
+public class App extends Application {
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        // if Orbot is installed, then default to using Tor, the user can still override
+        if (OrbotHelper.requestStartTor(this)) {
+            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
+            configureTor(prefs.getBoolean(getString(R.string.useTor), true));
+        }
+    }
+
+    /**
+     * Set the proxy settings based on whether Tor should be enabled or not.
+     */
+    static void configureTor(boolean useTor) {
+        if (useTor) {
+            NetCipher.useTor();
+        } else {
+            NetCipher.setProxy(null);
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/Downloader.java

@@ -41,7 +41,6 @@ public class Downloader {
      * @param language the language (usually a 2-character code) to set as the preferred language
      * @return the contents of the specified text file*/
     public static String download(String siteUrl, String language) {
-        NetCipher.useTor();
         String ret = "";
         try {
             URL url = new URL(siteUrl);
@@ -86,7 +85,6 @@ public class Downloader {
  * @return the contents of the specified text file*/
     public static String download(String siteUrl) {
         String ret = "";
-        NetCipher.useTor();
 
         try {
             URL url = new URL(siteUrl);

app/src/main/java/org/schabi/newpipe/PlayVideoActivity.java

@@ -3,7 +3,6 @@ package org.schabi.newpipe;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.content.pm.ActivityInfo;
 import android.content.res.Configuration;
 import android.media.MediaPlayer;
@@ -26,8 +25,6 @@ import android.widget.Button;
 import android.widget.MediaController;
 import android.widget.ProgressBar;
 import android.widget.VideoView;
-import info.guardianproject.netcipher.NetCipher;
-import info.guardianproject.netcipher.proxy.OrbotHelper;
 
 /**
  * Copyright (C) Christian Schabesberger 2015 <chris.schabesberger@mailbox.org>
@@ -47,7 +44,7 @@ import info.guardianproject.netcipher.proxy.OrbotHelper;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-public class PlayVideoActivity extends AppCompatActivity implements OnSharedPreferenceChangeListener {
+public class PlayVideoActivity extends AppCompatActivity {
 
     //// TODO: 11.09.15 add "choose stream" menu 
     
@@ -173,9 +170,6 @@ public class PlayVideoActivity extends AppCompatActivity implements OnSharedPref
         if(prefs.getBoolean(PREF_IS_LANDSCAPE, false) && !isLandscape) {
             toggleOrientation();
         }
-
-        setTorPreference(prefs);
-        prefs.registerOnSharedPreferenceChangeListener(this);
     }
 
     @Override
@@ -197,7 +191,6 @@ public class PlayVideoActivity extends AppCompatActivity implements OnSharedPref
     protected void onDestroy() {
         super.onDestroy();
         prefs = getPreferences(Context.MODE_PRIVATE);
-        prefs.unregisterOnSharedPreferenceChangeListener(this);
     }
 
     @Override
@@ -361,21 +354,4 @@ public class PlayVideoActivity extends AppCompatActivity implements OnSharedPref
         editor.putBoolean(PREF_IS_LANDSCAPE, isLandscape);
         editor.apply();
     }
-
-    private void setTorPreference(SharedPreferences prefs) {
-        // if Orbot is installed, then default to using Tor, the user can still override
-        if(prefs.getBoolean(getString(R.string.useTor), OrbotHelper.isOrbotInstalled(this))) {
-            NetCipher.useTor();
-        } else {
-            NetCipher.setProxy(null);
-        }
-    }
-
-    @Override
-    public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
-        if(key.equals(getString(R.string.useTor))) {
-            setTorPreference(prefs);
-        }
-    }
-
 }

app/src/main/java/org/schabi/newpipe/SettingsActivity.java

@@ -2,6 +2,8 @@ package org.schabi.newpipe;
 
 import android.content.res.Configuration;
 import android.os.Bundle;
+import android.preference.CheckBoxPreference;
+import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceFragment;
 import android.support.annotation.LayoutRes;
@@ -13,6 +15,8 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
+import info.guardianproject.netcipher.proxy.OrbotHelper;
+
 /**
  * Created by Christian Schabesberger on 31.08.15.
  *
@@ -52,10 +56,25 @@ public class SettingsActivity extends PreferenceActivity {
     }
 
     public static class SettingsFragment extends PreferenceFragment {
+        private CheckBoxPreference useTorCheckBox;
+
         @Override
         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             addPreferencesFromResource(R.xml.settings_screen);
+
+            // if Orbot is installed, then default to using Tor, the user can still override
+            useTorCheckBox = (CheckBoxPreference) findPreference(getString(R.string.useTor));
+            boolean useTor = OrbotHelper.isOrbotInstalled(getActivity());
+            useTorCheckBox.setDefaultValue(useTor);
+            useTorCheckBox.setChecked(useTor);
+            useTorCheckBox.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                @Override
+                public boolean onPreferenceChange(Preference preference, Object useTor) {
+                    App.configureTor((Boolean) useTor);
+                    return true;
+                }
+            });
         }
     }
 

app/src/main/res/xml/settings_screen.xml

@@ -75,8 +75,7 @@
         <CheckBoxPreference
             android:key="@string/useTor"
             android:title="@string/useTor"
-            android:summary="@string/useTorSummary"
-            android:defaultValue="false"/>
+            android:summary="@string/useTorSummary" />
 
     </PreferenceCategory>
 </PreferenceScreen>