Add back to home function to the actionbar icon for apis >=11 (fixes #291)

AndroidManifest.xml

@@ -53,7 +53,8 @@
         <activity android:name="Settings" />
         <activity
             android:name="AppDetails"
-            android:exported="true" >
+            android:exported="true"
+            android:parentActivityName="FDroid" >
             <intent-filter>
                 <category android:name="android.intent.category.DEFAULT" />
 
@@ -61,12 +62,22 @@
 
                 <data android:scheme="fdroid.app" />
             </intent-filter>
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="FDroid" />
+        </activity>
+        <activity
+            android:name="Preferences"
+            android:parentActivityName="FDroid" >
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="FDroid" />
         </activity>
-        <activity android:name="Preferences" />
         <activity
             android:name="SearchResults"
             android:exported="true"
-            android:launchMode="singleTop" >
+            android:launchMode="singleTop"
+            android:parentActivityName="FDroid" >
             <intent-filter>
                 <action android:name="android.intent.action.SEARCH" />
             </intent-filter>
@@ -74,6 +85,9 @@
             <meta-data
                 android:name="android.app.searchable"
                 android:resource="@xml/searchable" />
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="FDroid" />
         </activity>
 
         <receiver android:name="StartupReceiver" >

src/org/fdroid/fdroid/AppDetails.java

@@ -30,6 +30,7 @@ import org.fdroid.fdroid.compat.MenuManager;
 import org.fdroid.fdroid.DB.CommaSeparatedList;
 import org.xml.sax.XMLReader;
 
+import android.app.ActionBar;
 import android.app.AlertDialog;
 import android.app.ListActivity;
 import android.app.ProgressDialog;
@@ -180,6 +181,8 @@ public class AppDetails extends ListActivity {
     protected void onCreate(Bundle savedInstanceState) {
 
         super.onCreate(savedInstanceState);
+        if (Utils.hasApi(11))
+            getActionBar().setDisplayHomeAsUpEnabled(true);
 
         setContentView(R.layout.appdetails);
 

src/org/fdroid/fdroid/Preferences.java

@@ -20,6 +20,7 @@ package org.fdroid.fdroid;
 
 import java.io.File;
 
+import android.app.ActionBar;
 import android.content.Intent;
 import android.os.Bundle;
 import android.preference.Preference;
@@ -33,6 +34,8 @@ public class Preferences extends PreferenceActivity implements
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        if (Utils.hasApi(11))
+            getActionBar().setDisplayHomeAsUpEnabled(true);
         addPreferencesFromResource(R.xml.preferences);
         for (String prefkey : new String[] { "reset", "ignoreTouchscreen",
                 "showIncompatible" }) {

src/org/fdroid/fdroid/SearchResults.java

@@ -21,6 +21,7 @@ package org.fdroid.fdroid;
 import java.util.ArrayList;
 import java.util.List;
 
+import android.app.ActionBar;
 import android.app.ListActivity;
 import android.app.SearchManager;
 import android.content.Intent;
@@ -47,6 +48,8 @@ public class SearchResults extends ListActivity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        if (Utils.hasApi(11))
+            getActionBar().setDisplayHomeAsUpEnabled(true);
         applist = new AvailableAppListAdapter(this);
         setContentView(R.layout.searchresults);