Enhancement: allow custom config file and data

android/AndroidManifest.xml

@@ -34,7 +34,7 @@
             <!-- Splash screen -->
         </activity>
     </application>
-    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="24"/>
+    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="23"/>
     <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
     <uses-feature android:glEsVersion="0x00020000"/>
     <uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true"/>
@@ -46,6 +46,8 @@
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:required="false"/>
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
 
 </manifest>

src/core/StelFileMgr.cpp

@@ -41,6 +41,7 @@
 
 // Initialize static members.
 QStringList StelFileMgr::fileLocations;
+QString StelFileMgr::cuserDir;
 QString StelFileMgr::userDir;
 QString StelFileMgr::screenshotDir;
 QString StelFileMgr::installDir;
@@ -57,26 +58,43 @@ void StelFileMgr::init()
 #elif defined(Q_OS_MAC)
 	userDir = QDir::homePath() + "/Library/Application Support/Stellarium";
 #else
-	userDir = QDir::homePath() + "/.stellarium";
+    // Modifiable config file (Cheng Xinlun, May 14 2017)
+    // TODO: request permissions on running
+    userDir = QDir::homePath() + "/.stellarium";
+    cuserDir = QString::fromLocal8Bit(qgetenv("EXTERNAL_STORAGE")) + "/stellarium";
 #endif
 
-	if (!QFile(userDir).exists())
+    if (!QFile(cuserDir).exists())
 	{
-		qWarning() << "User config directory does not exist: " << QDir::toNativeSeparators(userDir);
+        qWarning() << "User config directory does not exist: " << QDir::toNativeSeparators(cuserDir);
 	}
 	try
 	{
-		makeSureDirExistsAndIsWritable(userDir);
+        makeSureDirExistsAndIsWritable(cuserDir);
+        fileLocations.append(cuserDir);  // Higher priority than default dir
 	}
 	catch (std::runtime_error &e)
-	{
-		qFatal("Error: cannot create user config directory: %s", e.what());
+    {
+        qWarning() << "Cannot write to SD card, will not add custom user directory";
 	}
 
+    // Default user location
+    if (!QFile(userDir).exists())
+    {
+        qWarning() << "User config directory does not exist: " << QDir::toNativeSeparators(userDir);
+    }
+    try
+    {
+        makeSureDirExistsAndIsWritable(userDir);
+    }
+    catch (std::runtime_error &e)
+    {
+        qFatal("Error: cannot create user config directory: %s", e.what());
+    }
+    // OK, now we have the userDir set, add it to the search path
+    fileLocations.append(userDir);
+
 
-	// OK, now we have the userDir set, add it to the search path
-	fileLocations.append(userDir);
-
 	// Determine install data directory location
 
 	// If we are running from the build tree, we use the files from the current directory

src/core/StelFileMgr.hpp

@@ -208,6 +208,9 @@ class StelFileMgr
 
 	static QStringList fileLocations;
 
+    // Custom user dir
+    static QString cuserDir;
+
 	//! Used to store the user data directory
 	static QString userDir;
 

src/main.cpp

@@ -192,7 +192,7 @@ int main(int argc, char **argv)
 		if (configFileFullPath.isEmpty())
 			qFatal("Could not create configuration file %s.", qPrintable(configName));
 	}
-
+    qDebug() << "Config file: " << configFileFullPath;
 	QSettings* confSettings = NULL;
 	if (StelFileMgr::exists(configFileFullPath))
 	{