Add project files

.gitignore

+# Built application files
+*.apk
+*.ap_
+*.aab
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+.idea/caches
+
+# Keystore files
+# Uncomment the following lines if you do not want to check your keystore files in.
+#*.jks
+#*.keystore
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild

.idea/.name

+TNEF Extractor
\ No newline at end of file

.idea/codeStyles/Project.xml

+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <codeStyleSettings language="XML">
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+  </code_scheme>
+</component>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/TNEF Extractor.iml" filepath="$PROJECT_DIR$/TNEF Extractor.iml" />
+      <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

.idea/runConfigurations.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

README.md

-tnef-extractor
+# TNEF Extractor

app/.gitignore

+/build

app/build.gradle

+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.2"
+    defaultConfig {
+        applicationId "com.starapps.tools.tnefextractor"
+        minSdkVersion 15
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'net.freeutils:jtnef:2.0.0'
+    implementation 'androidx.documentfile:documentfile:1.0.1'
+}

app/proguard-rules.pro

+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# 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 *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.starapps.tools.tnefextractor">
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
+    <application
+        android:allowBackup="false"
+        android:label="@string/app_name"
+        tools:ignore="GoogleAppIndexingWarning,MissingApplicationIcon">
+
+        <activity
+            android:name=".TNEFActivity"
+            android:excludeFromRecents="true"
+            android:theme="@style/Theme.AppCompat">
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+
+                <data android:scheme="file" />
+                <data android:scheme="content" />
+                <data android:mimeType="application/ms-tnef" />
+                <data android:mimeType="application/vnd.ms-tnef" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+
+                <data android:mimeType="application/ms-tnef" />
+                <data android:mimeType="application/vnd.ms-tnef" />
+            </intent-filter>
+
+        </activity>
+
+    </application>
+
+</manifest>

app/src/main/java/com/starapps/tools/tnefextractor/TNEFActivity.java

+package com.starapps.tools.tnefextractor;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.documentfile.provider.DocumentFile;
+
+import android.app.Activity;
+import android.content.ContentResolver;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Environment;
+import android.webkit.MimeTypeMap;
+import android.widget.Toast;
+
+import net.freeutils.tnef.Attachment;
+import net.freeutils.tnef.Message;
+import net.freeutils.tnef.TNEFInputStream;
+import net.freeutils.tnef.TNEFUtils;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class TNEFActivity extends AppCompatActivity {
+	private static final int REQUEST_CODE_BROWSE_FOLDER = 1;
+
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+
+		if(android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+			Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
+
+			startActivityForResult(intent, REQUEST_CODE_BROWSE_FOLDER);
+		} else {
+			File folder = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
+
+			if(folder != null) {
+				extractTo(DocumentFile.fromFile(folder));
+			}
+		}
+	}
+
+	@Override
+	public void onActivityResult(int requestCode, int resultCode, Intent data) {
+		super.onActivityResult(requestCode, resultCode, data);
+
+		if(resultCode != Activity.RESULT_OK || data == null || data.getData() == null) {
+			finish();
+
+			return;
+		}
+
+		if(requestCode == REQUEST_CODE_BROWSE_FOLDER) {
+			extractTo(DocumentFile.fromTreeUri(getApplicationContext(), data.getData()));
+		}
+	}
+
+	private void extractTo(DocumentFile folderFile) {
+		Uri file = getFile();
+
+		if(file != null) {
+			InputStream inputStream = null;
+			TNEFInputStream tnefInputStream = null;
+			Message message = null;
+
+			try {
+				ContentResolver contentResolver = getApplicationContext().getContentResolver();
+				inputStream = contentResolver.openInputStream(file);
+				tnefInputStream = new TNEFInputStream(inputStream);
+				message = new Message(tnefInputStream);
+
+				extractAttachmentsTo(message, folderFile);
+				Toast.makeText(getApplicationContext(), getString(R.string.extraction_succeeded), Toast.LENGTH_LONG).show();
+			} catch(IOException e) {
+				Toast.makeText(getApplicationContext(), getString(R.string.extraction_failed_all), Toast.LENGTH_LONG).show();
+			} finally {
+				try {
+					TNEFUtils.closeAll(message, tnefInputStream, inputStream);
+				} catch(IOException ignored) {
+				}
+			}
+		}
+
+		finish();
+	}
+
+	private void extractAttachmentsTo(Message message, DocumentFile folder) {
+		ContentResolver contentResolver = getApplicationContext().getContentResolver();
+
+		for(Attachment attachment : message.getAttachments()) {
+			if(attachment.getNestedMessage() != null) {
+				extractAttachmentsTo(attachment.getNestedMessage(), folder);
+			} else {
+				String filename = attachment.getFilename();
+
+				if(filename != null) {
+					filename = filename.replaceAll("(.*[/\\\\])*", "");
+
+					try {
+						DocumentFile file = folder.createFile(getMimeType(filename), filename);
+
+						if(file != null) {
+							attachment.writeTo(contentResolver.openOutputStream(file.getUri()));
+						}
+					} catch(IOException e) {
+						Toast.makeText(getApplicationContext(), getString(R.string.extraction_failed_single, filename), Toast.LENGTH_LONG).show();
+					}
+				}
+			}
+		}
+	}
+
+	private Uri getFile() {
+		String action = getIntent().getAction();
+
+		if(action != null) {
+			if(action.equals(Intent.ACTION_VIEW)) {
+				return getIntent().getData();
+			} else if(action.equals(Intent.ACTION_SEND)) {
+				return getIntent().getParcelableExtra(Intent.EXTRA_STREAM);
+			}
+		}
+
+		return null;
+	}
+
+	public static String getMimeType(String filename) {
+		String type = null;
+		String extension = MimeTypeMap.getFileExtensionFromUrl(filename);
+
+		if(extension != null) {
+			type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
+		}
+
+		return type;
+	}
+}

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

+<resources>
+    <string name="app_name">TNEF Extractor</string>
+    <string name="extraction_failed_all">Failed to extract file.</string>
+    <string name="extraction_failed_single">Failed to extract attachment %1$s.</string>
+    <string name="extraction_succeeded">File extracted successfully.</string>
+</resources>

build.gradle

+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle.properties

+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
+

gradle/wrapper/gradle-wrapper.properties

+#Sun Sep 15 15:40:39 CEST 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip

gradlew

+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"