Hide the app from launcher

app/build.gradle

@@ -22,8 +22,10 @@ android {
 
     productFlavors {
         regular {
+            buildConfigField "boolean", "HIDDEN_APP", "false"
         }
         hidden {
+            buildConfigField "boolean", "HIDDEN_APP", "true"
         }
     }
 

app/src/hidden/AndroidManifest.xml

@@ -2,10 +2,18 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
+
     <application
-        android:label="@string/app_name_hidden"
+        android:label="@string/hidden_app_name"
         tools:replace="label">
 
+        <receiver android:name=".DialLaunchReceiver" >
+            <intent-filter>
+                <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
+            </intent-filter>
+        </receiver>
+
     </application>
 
 </manifest>

app/src/main/AndroidManifest.xml

@@ -16,13 +16,16 @@
         android:label="@string/app_name"
         android:theme="@style/TraccarTheme">
 
-        <activity android:name=".MainActivity"
+        <activity android:name=".MainActivity" android:launchMode="singleTask" />
-            android:launchMode="singleTask">
+
+        <activity-alias
+            android:name=".Launcher"
+            android:targetActivity=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
-        </activity>
+        </activity-alias>
 
         <activity android:name=".StatusActivity"/>
 

app/src/main/java/org/traccar/client/DialLaunchReceiver.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.client;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+public class DialLaunchReceiver extends BroadcastReceiver {
+
+    private static final String LAUNCHER_NUMBER = "8722227"; // TRACCAR
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        String phoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
+        if (phoneNumber.equals(LAUNCHER_NUMBER)) {
+            setResultData(null);
+            Intent appIntent = new Intent(context, MainActivity.class);
+            appIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            context.startActivity(appIntent);
+        }
+    }
+
+}

app/src/main/java/org/traccar/client/MainActivity.java

@@ -18,6 +18,7 @@ package org.traccar.client;
 import android.Manifest;
 import android.app.AlertDialog;
 import android.app.Dialog;
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
@@ -59,6 +60,11 @@ public class MainActivity extends PreferenceActivity implements OnSharedPreferen
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+
+        if (BuildConfig.HIDDEN_APP) {
+            removeLauncherIcon();
+        }
+
         sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
         addPreferencesFromResource(R.xml.preferences);
         initPreferences();
@@ -68,6 +74,21 @@ public class MainActivity extends PreferenceActivity implements OnSharedPreferen
         }
     }
 
+    private void removeLauncherIcon() {
+        ComponentName componentName = new ComponentName(getPackageName(), getPackageName() + ".Launcher");
+        PackageManager packageManager = getPackageManager();
+        if (packageManager.getComponentEnabledSetting(componentName) != PackageManager.COMPONENT_ENABLED_STATE_DISABLED) {
+            packageManager.setComponentEnabledSetting(
+                    componentName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
+
+            AlertDialog.Builder builder = new AlertDialog.Builder(this);
+            builder.setIcon(android.R.drawable.ic_dialog_alert);
+            builder.setMessage(getString(R.string.hidden_alert));
+            builder.setPositiveButton(android.R.string.ok, null);
+            builder.show();
+        }
+    }
+
     private boolean hasPermission(String permission) {
         if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP_MR1) {
             return true;

app/src/main/res/values/strings.xml

@@ -2,7 +2,6 @@
 <resources>
 
     <string name="app_name">Traccar Client</string>
-    <string name="app_name_hidden">Device Settings</string>
     <string name="app_logo">Traccar</string>
 
     <string name="settings_id_title">Device identifier</string>
@@ -41,4 +40,7 @@
     <string name="status_location_update">Location update</string>
     <string name="status_connectivity_change">Connectivity change</string>
 
+    <string name="hidden_app_name">Device Settings</string>
+    <string name="hidden_alert">The app has been hidden from the phone launcher. To open it again please dial 8722227 (TRACCAR).</string>
+
 </resources>