Helper app to chose a config file before loading the GearVR app

NOMADGearVRChooser/.classpath

+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="src" path="gen"/>
+	<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
+	<classpathentry kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
+	<classpathentry kind="output" path="bin/classes"/>
+</classpath>

NOMADGearVRChooser/.project

+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>MyAndroidApp</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ApkBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>com.android.ide.eclipse.adt.AndroidNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

NOMADGearVRChooser/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.lrz.NOMADGearVRChooser"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk android:minSdkVersion="10" />
+	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    <application
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name" >
+        <activity
+            android:label="@string/app_name"
+            android:name=".MyAndroidAppActivity" >
+            <intent-filter >
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file

NOMADGearVRChooser/build.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project name="MyAndroidAppActivity" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+         It contains the path to the SDK. It should *NOT* be checked into
+         Version Control Systems. -->
+    <property file="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+         'android' tool to add properties to it.
+         This is the place to change some Ant specific build properties.
+         Here are some properties you may want to change/update:
+
+         source.dir
+             The name of the source directory. Default is 'src'.
+         out.dir
+             The name of the output directory. Default is 'bin'.
+
+         For other overridable properties, look at the beginning of the rules
+         files in the SDK, at tools/ant/build.xml
+
+         Properties related to the SDK location or the project target should
+         be updated using the 'android' tool with the 'update' action.
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems.
+
+         -->
+    <property file="ant.properties" />
+
+    <!-- if sdk.dir was not set from one of the property file, then
+         get it from the ANDROID_HOME env var.
+         This must be done before we load project.properties since
+         the proguard config can use sdk.dir -->
+    <property environment="env" />
+    <condition property="sdk.dir" value="${env.ANDROID_HOME}">
+        <isset property="env.ANDROID_HOME" />
+    </condition>
+
+    <!-- The project.properties file is created and updated by the 'android'
+         tool, as well as ADT.
+
+         This contains project specific properties such as project target, and library
+         dependencies. Lower level build properties are stored in ant.properties
+         (or in .classpath for Eclipse projects).
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable."
+            unless="sdk.dir"
+    />
+
+    <!--
+        Import per project custom build rules if present at the root of the project.
+        This is the place to put custom intermediary targets such as:
+            -pre-build
+            -pre-compile
+            -post-compile (This is typically used for code obfuscation.
+                           Compiled code location: ${out.classes.absolute.dir}
+                           If this is not done in place, override ${out.dex.input.absolute.dir})
+            -post-package
+            -post-build
+            -pre-clean
+    -->
+    <import file="custom_rules.xml" optional="true" />
+
+    <!-- Import the actual build file.
+
+         To customize existing targets, there are two options:
+         - Customize only one target:
+             - copy/paste the target into this file, *before* the
+               <import> task.
+             - customize it to your needs.
+         - Customize the whole content of build.xml
+             - copy/paste the content of the rules files (minus the top node)
+               into this file, replacing the <import> task.
+             - customize to your needs.
+
+         ***********************
+         ****** IMPORTANT ******
+         ***********************
+         In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+         in order to avoid having your file be overridden by tools such as "android update project"
+    -->
+    <!-- version-tag: 1 -->
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+
+</project>

NOMADGearVRChooser/do.bat

+ant debug
\ No newline at end of file

NOMADGearVRChooser/local.properties

+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must *NOT* be checked into Version Control Systems,
+# as it contains information specific to your local configuration.
+
+# location of the SDK. This is only used by Ant
+# For customization when using a Version Control System, please read the
+# header note.
+sdk.dir=Y:\\v2t\\software\\Android\\android-sdk

NOMADGearVRChooser/proguard-project.txt

+# To enable ProGuard in your project, edit project.properties
+# to define the proguard.config property as described in that file.
+#
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in ${sdk.dir}/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the ProGuard
+# include property in project.properties.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

NOMADGearVRChooser/proguard.cfg

+-optimizationpasses 5
+-dontusemixedcaseclassnames
+-dontskipnonpubliclibraryclasses
+-dontpreverify
+-verbose
+-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
+
+-keep public class * extends android.app.Activity
+-keep public class * extends android.app.Application
+-keep public class * extends android.app.Service
+-keep public class * extends android.content.BroadcastReceiver
+-keep public class * extends android.content.ContentProvider
+-keep public class * extends android.app.backup.BackupAgentHelper
+-keep public class * extends android.preference.Preference
+-keep public class com.android.vending.licensing.ILicensingService
+
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet);
+}
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+
+-keepclassmembers class * extends android.app.Activity {
+   public void *(android.view.View);
+}
+
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+-keep class * implements android.os.Parcelable {
+  public static final android.os.Parcelable$Creator *;
+}

NOMADGearVRChooser/project.properties

+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system use,
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+
+# Project target.
+target=android-19

NOMADGearVRChooser/res/values/strings.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">NOMADGearVRChooser</string>
+</resources>
\ No newline at end of file

NOMADGearVRChooser/src/com/lrz/NOMADGearVRChooser/Filepath.java

+package com.lrz.NOMADGearVRChooser;
+
+//https://stackoverflow.com/questions/3401579/get-filename-and-path-from-uri-from-mediastore/7265235#7265235
+
+class Filepath {
+
+//@SuppressLint("NewApi")
+    public static String getFilePath(android.content.Context context, android.net.Uri uri) throws java.net.URISyntaxException {
+        String selection = null;
+        String[] selectionArgs = null;
+        // Uri is different in versions after KITKAT (Android 4.4), we need to
+        if (android.os.Build.VERSION.SDK_INT >= 19 && android.provider.DocumentsContract.isDocumentUri(context.getApplicationContext(), uri)) {
+            if (isExternalStorageDocument(uri)) {
+                final String docId = android.provider.DocumentsContract.getDocumentId(uri);
+                final String[] split = docId.split(":");
+                return android.os.Environment.getExternalStorageDirectory() + "/" + split[1];
+            } else if (isDownloadsDocument(uri)) {
+                final String id = android.provider.DocumentsContract.getDocumentId(uri);
+                uri = android.content.ContentUris.withAppendedId(
+                        android.net.Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
+            } else if (isMediaDocument(uri)) {
+                final String docId = android.provider.DocumentsContract.getDocumentId(uri);
+                final String[] split = docId.split(":");
+                final String type = split[0];
+                if ("image".equals(type)) {
+                    uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
+                } else if ("video".equals(type)) {
+                    uri = android.provider.MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
+                } else if ("audio".equals(type)) {
+                    uri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
+                }
+                selection = "_id=?";
+                selectionArgs = new String[]{
+                        split[1]
+                };
+            }
+        }
+        if ("content".equalsIgnoreCase(uri.getScheme())) {
+            String[] projection = {
+                    android.provider.MediaStore.Images.Media.DATA
+            };
+            android.database.Cursor cursor = null;
+            try {
+                cursor = context.getContentResolver()
+                        .query(uri, projection, selection, selectionArgs, null);
+                int column_index = cursor.getColumnIndexOrThrow(android.provider.MediaStore.Images.Media.DATA);
+                if (cursor.moveToFirst()) {
+                    return cursor.getString(column_index);
+                }
+            } catch (Exception e) {
+            }
+        } else if ("file".equalsIgnoreCase(uri.getScheme())) {
+            return uri.getPath();
+        }
+        return null;
+    }
+
+    public static boolean isExternalStorageDocument(android.net.Uri uri) {
+        return "com.android.externalstorage.documents".equals(uri.getAuthority());
+    }
+
+    public static boolean isDownloadsDocument(android.net.Uri uri) {
+        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
+    }
+
+    public static boolean isMediaDocument(android.net.Uri uri) {
+        return "com.android.providers.media.documents".equals(uri.getAuthority());
+    }
+
+}

NOMADGearVRChooser/src/com/lrz/NOMADGearVRChooser/MyAndroidAppActivity.java

+package com.lrz.NOMADGearVRChooser;
+
+import android.app.Activity;
+import android.util.Log;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.widget.Button;
+import android.view.View;
+import android.view.View.OnClickListener;
+
+public class MyAndroidAppActivity extends Activity {
+String TAG="NOMADGearVRChooser";
+
+//https://stackoverflow.com/questions/3872063/launch-an-application-from-another-application-on-android
+public void startNewActivity(android.content.Context context, String packageName) {
+    Intent intent = context.getPackageManager().getLaunchIntentForPackage(packageName);
+    if (intent != null) {
+        // We found the activity now start the activity
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        context.startActivity(intent);
+    }
+}
+
+void nativeLoadConfigFile()
+{
+	startNewActivity(this.getApplicationContext(), "");
+}
+
+//check this once nomadGearVR is in the market
+//https://stackoverflow.com/questions/3872063/launch-an-application-from-another-application-on-android
+void nativeSetConfigFile(String s, String externalsd)
+{
+	java.lang.String path=android.os.Environment.getExternalStorageDirectory()+"/NOMAD";
+	java.io.File dir = new java.io.File(path);
+	dir.mkdir();
+	
+	try {
+	java.io.PrintWriter pw= new java.io.PrintWriter (path+"/NOMADGearVR.cfg");
+	pw.println(s);
+	pw.close();
+	//this.finishAffinity();
+	android.content.Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.lrz.NOMADGearvrT");
+	if (launchIntent != null) { 
+    startActivity(launchIntent);//null pointer check in case package name was not found
+	} else {
+		android.util.Log.d(TAG, "com.lrz.NOMADGearvrT is not installed");
+	}
+	} catch (java.io.FileNotFoundException f) {
+		android.util.Log.d(TAG, "File not found exception "+f);
+		android.util.Log.d(TAG, "Could not save information");
+	}
+
+
+}
+
+//http://stackoverflow.com/questions/8854359/exception-open-failed-eacces-permission-denied-on-android
+// Storage Permissions
+private static final int REQUEST_EXTERNAL_STORAGE = 1;
+private static String[] PERMISSIONS_STORAGE = {
+        android.Manifest.permission.READ_EXTERNAL_STORAGE,
+        android.Manifest.permission.WRITE_EXTERNAL_STORAGE
+};
+
+/**
+ * Checks if the app has permission to write to device storage
+ *
+ * If the app does not has permission then the user will be prompted to grant permissions
+ *
+ * @param activity
+ */
+	public static void verifyStoragePermissions(Activity activity) {
+		// Check if we have write permission
+		int permission =  	android.support.v4.app.ActivityCompat.checkSelfPermission(activity, android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
+
+		if (permission != android.content.pm.PackageManager.PERMISSION_GRANTED) {
+			// We don't have permission so prompt the user
+			android.support.v4.app.ActivityCompat.requestPermissions(
+					activity,
+					PERMISSIONS_STORAGE,
+					REQUEST_EXTERNAL_STORAGE
+			);
+		}
+	}
+	
+	@Override
+    protected void onActivityResult(int requestCode, int resultCode, android.content.Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if(requestCode==123 && resultCode==RESULT_OK) {
+		String s=data.getDataString();
+		android.util.Log.d(TAG,"OnActivityResult, s="+s);
+		String uriString="";
+     		if (s.startsWith("file://")) {
+			uriString=s.substring(7);
+		} else if (s.startsWith("content://com.asus.filemanager.OpenFileProvider/file")) {
+			uriString=s.substring(52);
+		} else {
+			android.net.Uri u=android.net.Uri.parse(s);
+			try {
+			uriString=Filepath.getFilePath (this.getApplicationContext(), u);
+			} catch (java.net.URISyntaxException e) {
+			android.util.Log.d(TAG,"URISyntaxException, e="+e);
+			uriString=null;
+			}
+		}
+		android.util.Log.d("NOMADGearVRChooser","OnActivityResult, uri="+uriString);
+		nativeSetConfigFile(uriString, android.os.Environment.getExternalStorageDirectory().getPath() + "/");   
+		nativeLoadConfigFile();    
+        }
+    }
+	
+	//http://stackoverflow.com/questions/13136539/caused-by-android-os-networkonmainthreadexception
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		verifyStoragePermissions(this);
+	
+
+		String externalsd=android.os.Environment.getExternalStorageDirectory().getPath() + "/";
+	//intents
+	android.content.Intent intent = getIntent();
+	
+	String s=intent.getDataString();
+	String uriString=externalsd+"material.ncfg";
+	if (s==null) {
+		android.util.Log.d(TAG,"String intent is null");
+	       android.content.Intent intentSent = new android.content.Intent()
+		.setType("*/*")
+		.setAction(android.content.Intent.ACTION_GET_CONTENT);
+
+		startActivityForResult(android.content.Intent.createChooser(intentSent, "Select NOMAD VR config file (.ncfg)"), 123);		
+		s=intentSent.getDataString();
+	}
+	else
+		android.util.Log.d(TAG,"String intent is <"+ s+">");
+
+	android.util.Log.d(TAG,"String intent finally is <"+s+">");	
+	if (s!=null) {
+		if (s.startsWith("content://")) {//this only works with ncfg with no associated data
+			android.util.Log.d(TAG,"String intent is <"+s+">");
+			try {
+				java.io.InputStream input = getContentResolver().openInputStream(intent.getData());
+				byte[] buffer = new byte[8 * 1024];
+				java.io.FileOutputStream output = new java.io.FileOutputStream(uriString);
+				try{
+					int bytesRead;
+					while((bytesRead = input.read(buffer)) != -1){
+						output.write(buffer, 0, bytesRead);
+					}
+				} catch (Exception e) {
+					 android.util.Log.d(TAG,"Exception writing intent to disk, "+e);
+				}finally {
+					try{
+						output.close();
+					} catch (Exception e) {
+						uriString=null;
+						android.util.Log.d(TAG,"Exception closing output stream, "+e);
+					}
+					try {
+						input.close();
+					} catch (java.io.IOException e) {
+						uriString=null;
+						android.util.Log.d(TAG,"Exception closing input stream, "+e);
+					}
+				}
+			} catch (java.io.IOException e) {
+				uriString=null;
+				android.util.Log.d(TAG,"Exception saving intent to disk, "+e);
+			} 
+		if (uriString!=null)
+			nativeSetConfigFile(uriString, externalsd);
+		} else if (s.startsWith("file://")) {
+			uriString=s.substring(7);
+			nativeSetConfigFile(uriString, externalsd);
+		} else {
+			android.util.Log.d(TAG,"Unknown protocol in intent:"+ s);
+		}
+	} else { //use default
+		nativeSetConfigFile(externalsd+"Default.ncfg", externalsd);
+	}
+
+	}
+
+}
\ No newline at end of file