Add root access preference

res/values/strings.xml

@@ -236,4 +236,7 @@
     <string name="System">System</string>
     <string name="Wallpaper">Wallpaper</string>
     
+    <string name="requesting_root_access_title">Root access</string>
+    <string name="requesting_root_access_body">Requesting root access…</string>
+    
 </resources>

src/org/fdroid/fdroid/PreferencesActivity.java

@@ -20,6 +20,7 @@ package org.fdroid.fdroid;
 
 import android.os.Bundle;
 import android.preference.Preference;
+import android.preference.Preference.OnPreferenceClickListener;
 import android.preference.PreferenceActivity;
 import android.preference.CheckBoxPreference;
 import android.preference.EditTextPreference;
@@ -27,11 +28,12 @@ import android.preference.ListPreference;
 import android.content.SharedPreferences;
 import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.view.MenuItem;
-
 import android.support.v4.app.NavUtils;
 
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.compat.ActionBarCompat;
+import org.fdroid.fdroid.installer.CheckRootAsyncTask;
+import org.fdroid.fdroid.installer.CheckRootAsyncTask.CheckRootCallback;
 
 public class PreferencesActivity extends PreferenceActivity implements
         OnSharedPreferenceChangeListener {
@@ -156,6 +158,56 @@ public class PreferencesActivity extends PreferenceActivity implements
         }
     }
     
+    /**
+     * Initializes RootInstaller preference. This method ensures that the preference can only be enabled
+     * when the user grants access to F-Droid.
+     */
+    protected void initRootInstallerPreference() {
+        CheckBoxPreference pref = (CheckBoxPreference)findPreference(Preferences.PREF_ROOT_INSTALLER);
+        
+        // we are handling persistence ourself!
+        pref.setPersistent(false);
+
+        pref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+            
+            @Override
+            public boolean onPreferenceClick(Preference preference) {
+                final CheckBoxPreference pref = (CheckBoxPreference) preference;
+                
+                if (pref.isChecked()) {
+                    CheckRootAsyncTask checkTask = new CheckRootAsyncTask(PreferencesActivity.this, new CheckRootCallback() {
+                        
+                        @Override
+                        public void onRootCheck(boolean rootGranted) {
+                            if (rootGranted) {
+                                // root access granted
+                                SharedPreferences.Editor editor = pref.getSharedPreferences().edit();
+                                editor.putBoolean(Preferences.PREF_ROOT_INSTALLER, true);
+                                editor.commit();
+                                pref.setChecked(true);
+                            } else {
+                                // root access disallowed
+                                SharedPreferences.Editor editor = pref.getSharedPreferences().edit();
+                                editor.putBoolean(Preferences.PREF_ROOT_INSTALLER, false);
+                                editor.commit();
+                                pref.setChecked(false);
+                            }
+                        }
+                    });
+                    checkTask.execute();
+                } else {
+                    SharedPreferences.Editor editor = pref.getSharedPreferences().edit();
+                    editor.putBoolean(Preferences.PREF_ROOT_INSTALLER, false);
+                    editor.commit();
+                    pref.setChecked(false);
+                }
+                
+                return true;
+            }
+        });
+        
+    }
+
     @Override
     protected void onResume() {
 
@@ -166,6 +218,8 @@ public class PreferencesActivity extends PreferenceActivity implements
         for (String key : summariesToUpdate) {
             updateSummary(key, false);
         }
+        
+        initRootInstallerPreference();
     }
 
     @Override

src/org/fdroid/fdroid/installer/CheckRootAsyncTask.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+package org.fdroid.fdroid.installer;
+
+import org.fdroid.fdroid.R;
+
+import eu.chainfire.libsuperuser.Shell;
+import android.app.ProgressDialog;
+import android.content.Context;
+import android.os.AsyncTask;
+
+public class CheckRootAsyncTask extends AsyncTask<Void, Void, Boolean> {
+
+    ProgressDialog mDialog;
+    Context mContext;
+    CheckRootCallback mCallback;
+
+    public interface CheckRootCallback {
+        public void onRootCheck(boolean rootGranted);
+    }
+
+    public CheckRootAsyncTask(Context context, CheckRootCallback callback) {
+        super();
+        this.mContext = context;
+        this.mCallback = callback;
+    }
+
+    @Override
+    protected void onPreExecute() {
+        super.onPreExecute();
+
+        mDialog = new ProgressDialog(mContext);
+        mDialog.setTitle(R.string.requesting_root_access_title);
+        mDialog.setMessage(mContext.getString(R.string.requesting_root_access_body));
+        mDialog.setIndeterminate(true);
+        mDialog.setCancelable(false);
+        mDialog.show();
+    }
+
+    @Override
+    protected Boolean doInBackground(Void... params) {
+
+        boolean suAvailable = Shell.SU.available();
+
+        return suAvailable;
+    }
+
+    @Override
+    protected void onPostExecute(Boolean result) {
+        super.onPostExecute(result);
+
+        mDialog.dismiss();
+
+        mCallback.onRootCheck(result);
+    }
+
+}

src/org/fdroid/fdroid/installer/Installer.java

@@ -93,7 +93,7 @@ abstract public class Installer {
      * Creates a new Installer for installing/deleting processes starting from
      * an Activity
      * 
-     * @param context
+     * @param activity
      * @param pm
      * @param callback
      * @return