enable back navigaton in AppManager and Debug activitys ActionBar

app/src/main/AndroidManifest.xml

@@ -28,7 +28,11 @@
             android:label="@string/title_activity_settings" />
         <activity
             android:name=".AppManagerActivity"
-            android:label="App Manager" />
+            android:label="App Manager">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".ControlCenter" />
+        </activity>
 
         <service
             android:name=".NotificationListener"
@@ -90,7 +94,11 @@
 
         <activity
             android:name=".DebugActivity"
-            android:label="@string/title_activity_debug" />
+            android:label="@string/title_activity_debug">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".ControlCenter" />
+        </activity>
     </application>
 
 </manifest>

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/AppManagerActivity.java

@@ -6,6 +6,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
+import android.support.v4.app.NavUtils;
 import android.support.v4.content.LocalBroadcastManager;
 import android.view.ContextMenu;
 import android.view.MenuItem;
@@ -54,6 +55,7 @@ public class AppManagerActivity extends Activity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_appmanager);
+        getActionBar().setDisplayHomeAsUpEnabled(true);
 
         appListView = (ListView) findViewById(R.id.appListView);
         mGBDeviceAppAdapter = new GBDeviceAppAdapter(this, appList);
@@ -98,6 +100,16 @@ public class AppManagerActivity extends Activity {
         }
     }
 
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                NavUtils.navigateUpFromSameTask(this);
+                return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
     @Override
     protected void onDestroy() {
         LocalBroadcastManager.getInstance(this).unregisterReceiver(mReceiver);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/ControlCenter.java

@@ -122,32 +122,28 @@ public class ControlCenter extends Activity {
 
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
-        // Handle action bar item clicks here. The action bar will
-        // automatically handle clicks on the Home/Up button, so long
-        // as you specify a parent activity in AndroidManifest.xml.
-        int id = item.getItemId();
 
-        //noinspection SimplifiableIfStatement
-        if (id == R.id.action_settings) {
-            Intent intent = new Intent(this, SettingsActivity.class);
-            startActivity(intent);
-            return true;
-        } else if (id == R.id.action_debug) {
-            Intent intent = new Intent(this, DebugActivity.class);
-            startActivity(intent);
-            return true;
-        } else if (id == R.id.action_quit) {
-            Intent stopIntent = new Intent(this, BluetoothCommunicationService.class);
-            stopService(stopIntent);
+        switch (item.getItemId()) {
+            case R.id.action_settings:
+                Intent settingsIntent = new Intent(this, SettingsActivity.class);
+                startActivity(settingsIntent);
+                return true;
+            case R.id.action_debug:
+                Intent debugIntent = new Intent(this, DebugActivity.class);
+                startActivity(debugIntent);
+                return true;
+            case R.id.action_quit:
+                Intent stopIntent = new Intent(this, BluetoothCommunicationService.class);
+                stopService(stopIntent);
 
-            Intent quitIntent = new Intent(ControlCenter.ACTION_QUIT);
-            LocalBroadcastManager.getInstance(this).sendBroadcast(quitIntent);
-            return true;
-        } else if (id == R.id.action_refresh) {
-            if (deviceList.isEmpty()) {
-                refreshPairedDevices();
-                mGBDeviceAdapter.notifyDataSetChanged();
-            }
+                Intent quitIntent = new Intent(ControlCenter.ACTION_QUIT);
+                LocalBroadcastManager.getInstance(this).sendBroadcast(quitIntent);
+                return true;
+            case R.id.action_refresh:
+                if (deviceList.isEmpty()) {
+                    refreshPairedDevices();
+                    mGBDeviceAdapter.notifyDataSetChanged();
+                }
         }
 
         return super.onOptionsItemSelected(item);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/DebugActivity.java

@@ -7,7 +7,9 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
+import android.support.v4.app.NavUtils;
 import android.support.v4.app.NotificationCompat;
+import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
@@ -38,6 +40,7 @@ public class DebugActivity extends Activity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_debug);
+        getActionBar().setDisplayHomeAsUpEnabled(true);
 
         registerReceiver(mReceiver, new IntentFilter(ControlCenter.ACTION_QUIT));
 
@@ -153,6 +156,16 @@ public class DebugActivity extends Activity {
         nManager.notify((int) System.currentTimeMillis(), ncomp.build());
     }
 
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                NavUtils.navigateUpFromSameTask(this);
+                return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
     @Override
     protected void onDestroy() {
         super.onDestroy();