[add] FileSource

dependencies/android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="ru.m.android">
+</manifest>

dependencies/android/build.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project name="android" default="help">
+    <property environment="env" />
+    <property name="sdk.dir" value="${env.ANDROID_SDK}" />
+
+    <property file="local.properties" />
+    <property file="ant.properties" />
+    <property file="project.properties" />
+
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+</project>

dependencies/android/project.properties

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+android.library=true
+android.library.reference.1=../extension-api
+target=android-::ANDROID_TARGET_SDK_VERSION::

dependencies/android/src/ru/m/android/FileUtil.java

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+package ru.m.android;
+
+import android.app.Activity;
+import android.content.res.AssetManager;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Handler;
+import android.view.View;
+import android.net.Uri;
+import android.util.Log;
+import org.haxe.extension.Extension;
+import org.haxe.lime.HaxeObject;
+import java.io.InputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class FileUtil extends Extension {
+    private static HaxeObject callback;
+
+    public static void browse(HaxeObject callback) {
+        FileUtil.callback = callback;
+        Intent intent = new Intent()
+            .setType("*/*")
+            .setAction(Intent.ACTION_GET_CONTENT);
+        Extension.mainActivity.startActivityForResult(Intent.createChooser(intent, "Select a file"), 123);
+    }
+
+    @Override
+    public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == 123 && resultCode == Activity.RESULT_OK) {
+            Uri uri = data.getData(); //The uri with the location of the file
+            try {
+                InputStream is = Extension.mainActivity.getContentResolver().openInputStream(uri);
+                byte[] result = getBytes(is);
+                callback.call("execute", new Object[]{result});
+            } catch (IOException exception) {
+                Log.e("FileUtil", "", exception);
+            }
+            return true;
+        } else {
+            return super.onActivityResult(requestCode, resultCode, data);
+        }
+    }
+
+    public static byte[] getBytes(InputStream inputStream) throws IOException {
+        ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
+        int bufferSize = 1024;
+        byte[] buffer = new byte[bufferSize];
+
+        int len = 0;
+        while ((len = inputStream.read(buffer)) != -1) {
+            byteBuffer.write(buffer, 0, len);
+        }
+        return byteBuffer.toByteArray();
+    }
+}