Write a new file anywhere in the android device.

.gitignore

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+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+*~
+*.autosave
+*.a
+*.core
+*.moc
+*.o
+*.obj
+*.orig
+*.rej
+*.so
+*.so.*
+*_pch.h.cpp
+*_resource.rc
+*.qm
+.#*
+*.*#
+core
+!core/
+tags
+.DS_Store
+*.debug
+Makefile*
+*.prl
+*.app
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+Thumbs.db
+*.res
+*.rc
+/.qmake.cache
+/.qmake.stash
+
+# qtcreator generated files
+*.pro.user*
+
+# xemacs temporary files
+*.flc
+
+# Vim temporary files
+.*.swp
+
+# Visual Studio generated files
+*.ib_pdb_index
+*.idb
+*.ilk
+*.pdb
+*.sln
+*.suo
+*.vcproj
+*vcproj.*.*.user
+*.ncb
+*.sdf
+*.opensdf
+*.vcxproj
+*vcxproj.*
+
+# MinGW generated files
+*.Debug
+*.Release
+
+# Python byte code
+*.pyc
+
+# Binaries
+# --------
+*.dll
+*.exe
+
+

AndroidUSBAccess.pro

@@ -0,0 +1,33 @@
+TEMPLATE = app
+TARGET = AndroidUSBAccess
+
+QT += qml quick network
+CONFIG += c++11
+
+SOURCES += main.cpp
+
+android {
+    QT += androidextras
+    OTHER_FILES += android/src/fr/jbflamant/androidusbaccess/HardwareUtils.java
+    ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android
+    SOURCES += android/HardwareUtils_Android.cpp
+    HEADERS += android/HardwareUtils_Android.h
+}
+
+RESOURCES += qml.qrc
+
+# Additional import path used to resolve QML modules in Qt Creator's code model
+QML_IMPORT_PATH =
+
+# Default rules for deployment.
+include(deployment.pri)
+
+DISTFILES += \
+    android/AndroidManifest.xml \
+    android/gradle/wrapper/gradle-wrapper.jar \
+    android/gradlew \
+    android/res/values/libs.xml \
+    android/build.gradle \
+    android/gradle/wrapper/gradle-wrapper.properties \
+    android/gradlew.bat
+

MainForm.ui.qml

@@ -0,0 +1,19 @@
+import QtQuick 2.5
+
+Rectangle {
+    property alias mouseArea: mouseArea
+
+    width: 360
+    height: 360
+
+    MouseArea {
+        id: mouseArea
+        anchors.fill: parent
+    }
+
+    Text {
+        anchors.centerIn: parent
+        text: "Hello World"
+    }
+}
+

README

@@ -0,0 +1,5 @@
+This project is an android application made with Qt.
+
+It permits to write a file on any external device connected to the Android device.
+
+

android/AndroidManifest.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0"?>
+<manifest package="fr.jbflamant.androidusbaccess" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="1.0" android:versionCode="1" android:installLocation="auto">
+    <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="@string/app_name" android:icon="@drawable/icon">
+        <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation" android:name="org.qtproject.qt5.android.bindings.QtActivity" android:label="@string/app_name" android:screenOrientation="unspecified" android:launchMode="singleTop">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+            <meta-data android:name="android.app.lib_name" android:value="AndroidUSBAccess"/>
+            <meta-data android:name="android.app.qt_sources_resource_id" android:resource="@array/qt_sources"/>
+            <meta-data android:name="android.app.repository" android:value="default"/>
+            <meta-data android:name="android.app.qt_libs_resource_id" android:resource="@array/qt_libs"/>
+            <meta-data android:name="android.app.bundled_libs_resource_id" android:resource="@array/bundled_libs"/>
+            <!-- Deploy Qt libs as part of package -->
+            <meta-data android:name="android.app.bundle_local_qt_libs" android:value="-- %%BUNDLE_LOCAL_QT_LIBS%% --"/>
+            <meta-data android:name="android.app.bundled_in_lib_resource_id" android:resource="@array/bundled_in_lib"/>
+            <meta-data android:name="android.app.bundled_in_assets_resource_id" android:resource="@array/bundled_in_assets"/>
+            <!-- Run with local libs -->
+            <meta-data android:name="android.app.use_local_qt_libs" android:value="-- %%USE_LOCAL_QT_LIBS%% --"/>
+            <meta-data android:name="android.app.libs_prefix" android:value="/data/local/tmp/qt/"/>
+            <meta-data android:name="android.app.load_local_libs" android:value="-- %%INSERT_LOCAL_LIBS%% --"/>
+            <meta-data android:name="android.app.load_local_jars" android:value="-- %%INSERT_LOCAL_JARS%% --"/>
+            <meta-data android:name="android.app.static_init_classes" android:value="-- %%INSERT_INIT_CLASSES%% --"/>
+            <!--  Messages maps -->
+            <meta-data android:value="@string/ministro_not_found_msg" android:name="android.app.ministro_not_found_msg"/>
+            <meta-data android:value="@string/ministro_needed_msg" android:name="android.app.ministro_needed_msg"/>
+            <meta-data android:value="@string/fatal_error_msg" android:name="android.app.fatal_error_msg"/>
+            <!--  Messages maps -->
+
+            <!-- Splash screen -->
+            <!--
+            <meta-data android:name="android.app.splash_screen_drawable" android:resource="@drawable/logo"/>
+            -->
+            <!-- Splash screen -->
+
+            <!-- Background running -->
+            <!-- Warning: changing this value to true may cause unexpected crashes if the
+                          application still try to draw after
+                          "applicationStateChanged(Qt::ApplicationSuspended)"
+                          signal is sent! -->
+            <meta-data android:name="android.app.background_running" android:value="false"/>
+            <!-- Background running -->
+        </activity>
+    </application>
+    <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="14"/>
+    <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
+
+    <!-- The following comment will be replaced upon deployment with default permissions based on the dependencies of the application.
+         Remove the comment if you do not require these default permissions. -->
+    <!-- %%INSERT_PERMISSIONS -->
+
+    <!-- The following comment will be replaced upon deployment with default features based on the dependencies of the application.
+         Remove the comment if you do not require these default features. -->
+    <!-- %%INSERT_FEATURES -->
+
+<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+</manifest>

android/HardwareUtils_Android.cpp

@@ -0,0 +1,51 @@
+
+#include "HardwareUtils_Android.h"
+#include <QtAndroid>
+#include <jni.h>
+
+#include <QDebug>
+
+HardwareUtilsAndroid *HardwareUtilsAndroid::Instance(QObject *parent) {
+    static HardwareUtilsAndroid *instance = NULL;
+
+    if(!instance) {
+        instance = new HardwareUtilsAndroid(parent);
+    }
+
+    return instance;
+}
+
+HardwareUtilsAndroid::HardwareUtilsAndroid(QObject *parent):
+    QObject(parent)
+{
+}
+
+HardwareUtilsAndroid::~HardwareUtilsAndroid()
+{
+}
+
+bool HardwareUtilsAndroid::writeOnUSB(QString filename) {
+    m_file.setFileName(filename);
+    QAndroidJniObject ACTION_CREATE_DOCUMENT = QAndroidJniObject::fromString("android.intent.action.CREATE_DOCUMENT");
+    QAndroidJniObject intent("android/content/Intent");
+    if (ACTION_CREATE_DOCUMENT.isValid() && intent.isValid()) {
+        intent.callObjectMethod("setAction", "(Ljava/lang/String;)Landroid/content/Intent;", ACTION_CREATE_DOCUMENT.object<jstring>());
+        intent.callObjectMethod("setType", "(Ljava/lang/String;)Landroid/content/Intent;", QAndroidJniObject::fromString("application/*").object<jstring>());
+        QtAndroid::startActivity(intent.object<jobject>(), 123, this);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void HardwareUtilsAndroid::handleActivityResult(int receiverRequestCode, int resultCode, const QAndroidJniObject & data) {
+    qDebug() << "Receive activity result";
+
+    jint RESULT_OK = QAndroidJniObject::getStaticField<jint>("android/app/Activity", "RESULT_OK");
+    if (receiverRequestCode == 123 && resultCode == RESULT_OK) {
+        QString path = data.callObjectMethod("getData", "()Landroid/net/Uri;").callObjectMethod("getPath", "()Ljava/lang/String;").toString();
+        qDebug() << "Destination path : " << path;
+    } else {
+        qDebug() << "Destination path is empty ";
+    }
+}

android/HardwareUtils_Android.h

@@ -0,0 +1,26 @@
+#ifndef HARDWAREUTILS_ANDROID_H
+#define HARDWAREUTILS_ANDROID_H
+
+#include <QObject>
+#include <QAndroidActivityResultReceiver>
+#include <QtAndroidExtras/QAndroidJniObject>
+#include <QtAndroidExtras/QAndroidJniEnvironment>
+#include <QFile>
+
+class HardwareUtilsAndroid: public QObject, public QAndroidActivityResultReceiver
+{
+private:
+    HardwareUtilsAndroid(QObject *parent = 0);
+
+public:
+    virtual ~HardwareUtilsAndroid();
+    static HardwareUtilsAndroid* Instance(QObject *parent = 0);
+
+    virtual void handleActivityResult(int receiverRequestCode, int resultCode, const QAndroidJniObject & data);
+    virtual bool writeOnUSB(QString filename);
+
+private:
+    QFile m_file;
+};
+
+#endif // HARDWAREUTILS_ANDROID_H

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Wed Apr 10 15:27:10 PDT 2013
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=http\://services.gradle.org/distributions/gradle-1.12-all.zip