├── settings.gradle ├── app ├── src │ ├── test │ │ ├── resources │ │ │ └── robolectric.properties │ │ └── java │ │ │ └── hu │ │ │ └── muzso │ │ │ └── fileslauncher │ │ │ ├── FilesLauncherScreenTest.java │ │ │ └── FilesLauncherSessionTest.java │ └── main │ │ ├── res │ │ ├── xml │ │ │ └── automotive_app_desc.xml │ │ ├── values │ │ │ └── strings.xml │ │ └── drawable │ │ │ └── ic_launcher.xml │ │ ├── java │ │ └── hu │ │ │ └── muzso │ │ │ └── fileslauncher │ │ │ ├── ResultScreen.java │ │ │ ├── FilesLauncherService.java │ │ │ └── FilesLauncherScreen.java │ │ └── AndroidManifest.xml ├── lint.xml └── build.gradle ├── gradle.properties ├── .gitignore ├── CHANGELOG.md ├── README.md └── LICENSE /settings.gradle: -------------------------------------------------------------------------------- 1 | rootProject.name="fileslauncher" 2 | include ":app" 3 | -------------------------------------------------------------------------------- /app/src/test/resources/robolectric.properties: -------------------------------------------------------------------------------- 1 | # robolectric properties 2 | -------------------------------------------------------------------------------- /app/src/main/res/xml/automotive_app_desc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | -------------------------------------------------------------------------------- /app/lint.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | android.useAndroidX=true 2 | android.defaults.buildfeatures.aidl=false 3 | android.defaults.buildfeatures.buildconfig=false 4 | android.defaults.buildfeatures.renderscript=false 5 | android.defaults.buildfeatures.resvalues=false 6 | android.defaults.buildfeatures.shaders=false 7 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Gradle files 2 | .gradle/ 3 | build/ 4 | release/ 5 | gradle/ 6 | gradlew 7 | gradlew.bat 8 | 9 | # Local configuration file (sdk path, etc) 10 | local.properties 11 | 12 | # Log/OS Files 13 | *.log 14 | 15 | # Android Studio generated files and folders 16 | captures/ 17 | .externalNativeBuild/ 18 | .cxx/ 19 | *.apk 20 | output.json 21 | 22 | # IntelliJ 23 | *.iml 24 | .idea/ 25 | misc.xml 26 | deploymentTargetDropDown.xml 27 | render.experimental.xml 28 | 29 | # Keystore files 30 | *.jks 31 | *.keystore 32 | 33 | # Google Services (e.g. APIs or Firebase) 34 | google-services.json 35 | 36 | # Android Profiling 37 | *.hprof 38 | -------------------------------------------------------------------------------- /app/src/main/java/hu/muzso/fileslauncher/ResultScreen.java: -------------------------------------------------------------------------------- 1 | package hu.muzso.fileslauncher; 2 | 3 | import androidx.annotation.NonNull; 4 | import androidx.car.app.CarContext; 5 | import androidx.car.app.Screen; 6 | import androidx.car.app.model.Action; 7 | import androidx.car.app.model.LongMessageTemplate; 8 | import androidx.car.app.model.Template; 9 | 10 | /** 11 | * A screen that shows a long text message. 12 | */ 13 | public class ResultScreen extends Screen { 14 | private final CarContext mCarContext; 15 | private final String mMessage; 16 | 17 | public ResultScreen(@NonNull CarContext carContext, String message) 18 | { 19 | super(carContext); 20 | mCarContext = carContext; 21 | mMessage = message; 22 | } 23 | 24 | @NonNull 25 | @Override 26 | public Template onGetTemplate() { 27 | return new LongMessageTemplate.Builder(mMessage) 28 | .setTitle(mCarContext.getString(R.string.result_title)) 29 | .setHeaderAction(Action.BACK) 30 | .build(); 31 | } 32 | } 33 | -------------------------------------------------------------------------------- /app/src/test/java/hu/muzso/fileslauncher/FilesLauncherScreenTest.java: -------------------------------------------------------------------------------- 1 | package hu.muzso.fileslauncher; 2 | 3 | import static com.google.common.truth.Truth.assertThat; 4 | 5 | import androidx.car.app.model.MessageTemplate; 6 | import androidx.car.app.testing.TestCarContext; 7 | import androidx.test.core.app.ApplicationProvider; 8 | 9 | import org.junit.Test; 10 | import org.junit.runner.RunWith; 11 | import org.robolectric.RobolectricTestRunner; 12 | import org.robolectric.annotation.internal.DoNotInstrument; 13 | 14 | /** 15 | * A sample test on {@link FilesLauncherScreen}. 16 | * 17 | *

Demonstrating the usage of {@link TestCarContext} and validating that the returned 18 | * {@link androidx.car.app.model.Template} has the expected contents. 19 | */ 20 | @RunWith(RobolectricTestRunner.class) 21 | @DoNotInstrument 22 | public class FilesLauncherScreenTest { 23 | private final TestCarContext mTestCarContext = 24 | TestCarContext.createCarContext(ApplicationProvider.getApplicationContext()); 25 | 26 | @Test 27 | public void getTemplate_containsExpectedRow() { 28 | FilesLauncherScreen screen = new FilesLauncherScreen(mTestCarContext); 29 | MessageTemplate template = (MessageTemplate) screen.onGetTemplate(); 30 | 31 | String msg = template.getMessage().toString(); 32 | assertThat(msg).isEqualTo("This app can launch the \"Files\" builtin application."); 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # Changelog 2 | 3 | All notable changes to this project will be documented in this file. 4 | 5 | The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). 6 | 7 | ## [1.0.2] - 2024-11-21 8 | 9 | ### Changed 10 | 11 | - The "Files" app in the Volvo EX30's 1.4.4 software update no longer has the com.android.documentsui.LauncherActivity activity exported, thus it cannot be launched by 3rd party apps. But the com.android.documentsui.files.FilesActivity activity still is (exported) and can be (launched by 3rd party apps) so I've added it to the list of activities to try, when the user presses the button. 12 | - Made a couple of Android Studio suggested adjustments (e.g. removed jcenter() from build.gradle, upgraded com.android.tools.build:gradle dep from 8.5.1 to 8.5.2). 13 | 14 | ## [1.0.1] - 2024-08-10 15 | 16 | ### Added 17 | 18 | - detailed error messages are displayed on a new screen (since toasts and notifications cannot contain longer texts) 19 | 20 | ### Changed 21 | 22 | - all kinds of unexpected exceptions are caught while calling Android APIs during the effort to launch the "Files" app 23 | - these error messages are displayed to the user 24 | 25 | ## [1.0.0] - 2024-08-01 26 | 27 | ### Added 28 | 29 | - Initial release (feature complete and mostly stable) 30 | 31 | [1.0.2]: https://github.com/muzso/fileslauncher/compare/1.0.1...1.0.2 32 | [1.0.1]: https://github.com/muzso/fileslauncher/compare/1.0.0...1.0.1 33 | [1.0.0]: https://github.com/muzso/fileslauncher/releases/tag/1.0.0 34 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: "com.android.application" 2 | 3 | android { 4 | compileSdk 34 5 | 6 | defaultConfig { 7 | applicationId "hu.muzso.fileslauncher" 8 | minSdkVersion 29 9 | targetSdkVersion 34 10 | versionCode 3 11 | versionName "1.0.2" 12 | } 13 | 14 | buildTypes { 15 | release { 16 | // Enables code shrinking, obfuscation, and optimization for only 17 | // the project's release build type. 18 | minifyEnabled true 19 | 20 | // Enables resource shrinking, which is performed by the 21 | // Android Gradle plugin. 22 | shrinkResources true 23 | 24 | // Includes the default ProGuard rules files that are packaged with 25 | // the Android Gradle plugin. 26 | proguardFiles getDefaultProguardFile( 27 | "proguard-android-optimize.txt"), 28 | "proguard-rules.pro" 29 | signingConfig signingConfigs.debug 30 | } 31 | } 32 | 33 | compileOptions { 34 | targetCompatibility = JavaVersion.VERSION_1_8 35 | sourceCompatibility = JavaVersion.VERSION_1_8 36 | } 37 | namespace "hu.muzso.fileslauncher" 38 | } 39 | 40 | dependencies { 41 | implementation "androidx.car.app:app-automotive:1.4.0" 42 | implementation "androidx.car.app:app:1.4.0" 43 | testImplementation "com.google.truth:truth:1.4.4" 44 | testImplementation "androidx.car.app:app-testing:1.4.0" 45 | testImplementation "androidx.test:core:1.6.1" 46 | testImplementation "org.robolectric:robolectric:4.13" 47 | } 48 | -------------------------------------------------------------------------------- /app/src/main/java/hu/muzso/fileslauncher/FilesLauncherService.java: -------------------------------------------------------------------------------- 1 | package hu.muzso.fileslauncher; 2 | 3 | import android.content.Intent; 4 | import android.content.pm.ApplicationInfo; 5 | 6 | import androidx.annotation.NonNull; 7 | import androidx.annotation.Nullable; 8 | import androidx.car.app.CarAppService; 9 | import androidx.car.app.Screen; 10 | import androidx.car.app.Session; 11 | import androidx.car.app.SessionInfo; 12 | import androidx.car.app.validation.HostValidator; 13 | 14 | /** 15 | * Entry point for the Files Launcher app. 16 | * 17 | *

{@link CarAppService} is the main interface between the app and the car host. For more 18 | * details, see the Android for 19 | * Cars Library developer guide. 20 | */ 21 | public final class FilesLauncherService extends CarAppService { 22 | 23 | public FilesLauncherService() { 24 | // Exported services must have an empty public constructor. 25 | } 26 | 27 | @Override 28 | @NonNull 29 | public Session onCreateSession(@NonNull SessionInfo sessionInfo) { 30 | return new Session() { 31 | @Override 32 | @NonNull 33 | public Screen onCreateScreen(@Nullable Intent intent) { 34 | return new FilesLauncherScreen(getCarContext()); 35 | } 36 | }; 37 | } 38 | 39 | @NonNull 40 | @Override 41 | public HostValidator createHostValidator() { 42 | if ((getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0) { 43 | return HostValidator.ALLOW_ALL_HOSTS_VALIDATOR; 44 | } else { 45 | return new HostValidator.Builder(getApplicationContext()) 46 | .addAllowedHosts(androidx.car.app.R.array.hosts_allowlist_sample) 47 | .build(); 48 | } 49 | } 50 | } 51 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # fileslauncher 2 | 3 | This is a minimalistic AAOS (Android Automotive OS) app to launch the builtin "Files" (com.android.documentsui or com.google.android.documentsui) application. 4 | It's based on the Hello World app in Google's [car-samples](https://github.com/android/car-samples/). 5 | 6 | Sometimes car manufacturers keep the builtin "Files" application on the head unit, but try to prevent user access by hiding it from the app list and prohibiting Google Assistant from launching it. The reason is that the "Files" app usually has the permission to initiate app installations from local APK files (i.e. sideloading) via the "Package installer" (com.google.android.packageinstaller) app. 7 | 8 | To work around this issue: 9 | 10 | - you can compile this app with your own `applicationId` (modify this property in `app/build.gradle`) 11 | - build an Android App Bundle, aka. AAB (must be signed) 12 | - create a new app in your Google Play Console 13 | - create a new release and upload the AAB 14 | - make it into an Internal Testing app 15 | - add your vehicle's Google account to the app's list of testers 16 | - install the app on the head unit (remotely) by logging into play.google.com with the vehicle's Google account and using the app's Internal Testing URL (you can do this on your desktop PC in a browser) 17 | 18 | Of course for all of this to work the head unit must have internet access: either with a built-in SIM/eSIM or via WiFi tethering. 19 | 20 | Note: the app tries to look for the "Files" application first with the "com.android.documentsui" package name (this is the package name used in [AOSP sources](https://android.googlesource.com/platform/packages/apps/DocumentsUI/+/refs/heads/android12L-platform-release/AndroidManifest.xml)) and if it is not found, it tries again with the "com.google.android.documentsui" package name (this is used in Android Studio's automotive emulator images). 21 | -------------------------------------------------------------------------------- /app/src/test/java/hu/muzso/fileslauncher/FilesLauncherSessionTest.java: -------------------------------------------------------------------------------- 1 | package hu.muzso.fileslauncher; 2 | 3 | import static com.google.common.truth.Truth.assertThat; 4 | 5 | import android.content.ComponentName; 6 | import android.content.Intent; 7 | 8 | import androidx.car.app.Screen; 9 | import androidx.car.app.Session; 10 | import androidx.car.app.SessionInfo; 11 | import androidx.car.app.testing.SessionController; 12 | import androidx.car.app.testing.TestCarContext; 13 | import androidx.car.app.testing.TestScreenManager; 14 | import androidx.lifecycle.Lifecycle; 15 | import androidx.test.core.app.ApplicationProvider; 16 | 17 | import org.junit.Test; 18 | import org.junit.runner.RunWith; 19 | import org.robolectric.Robolectric; 20 | import org.robolectric.RobolectricTestRunner; 21 | import org.robolectric.annotation.internal.DoNotInstrument; 22 | 23 | /** 24 | * A sample test on the session instance from {@link FilesLauncherService}. 25 | * 26 | *

Demonstrating the usage of {@link SessionController} and validating that the session is 27 | * pushing the expected screen when created. 28 | */ 29 | @RunWith(RobolectricTestRunner.class) 30 | @DoNotInstrument 31 | public class FilesLauncherSessionTest { 32 | private final TestCarContext mTestCarContext = 33 | TestCarContext.createCarContext(ApplicationProvider.getApplicationContext()); 34 | 35 | @Test 36 | public void onCreateScreen_returnsExpectedScreen() { 37 | FilesLauncherService service = Robolectric.setupService(FilesLauncherService.class); 38 | Session session = service.onCreateSession(SessionInfo.DEFAULT_SESSION_INFO); 39 | SessionController controller = 40 | new SessionController(session, mTestCarContext, 41 | new Intent().setComponent( 42 | new ComponentName(mTestCarContext, FilesLauncherService.class))); 43 | controller.moveToState(Lifecycle.State.CREATED); 44 | 45 | Screen screenCreated = 46 | mTestCarContext.getCarService(TestScreenManager.class).getScreensPushed().get(0); 47 | assertThat(screenCreated).isInstanceOf(FilesLauncherScreen.class); 48 | } 49 | 50 | } 51 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 9 | 12 | 15 | 18 | 19 | 23 | 24 | 28 | 29 | 32 | 33 | 36 | 37 | 38 | 39 | 40 | 41 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | Files Launcher 4 | This app can launch the \"Files\" built-in application. 5 | Launch 6 | Error while trying to launch the \"Files\" app 7 | Attempt #%1$d: package = %2$s, exception from %3$s: %4$s 8 | Attempt #%1$d: package = %2$s, activity = %3$s, exception from %4$s: %5$s 9 | Attempt #%1$d: package = %2$s, exception while getting activity class from Intent: %3$s 10 | Failed after trying the following package and activity combinations: 11 | %1$d.) package = %2$s%nactivity = %3$s 12 | Failed to get the package manager from the context. 13 | It seems that the \"Files\" app could be successfully launched, but there were some unexpected errors/exceptions along the way. 14 | It seems that the \"Files\" app could not be successfully launched as there were some unexpected errors/exceptions along the way. 15 | Please, check either the GitHub issues at %1$s or the Reddit thread at %2$s and if these issues were not reported yet, do so by including the version of the app, the type of the vehicle/device and the error messages below. 16 | https://github.com/muzso/fileslauncher/issues 17 | https://www.reddit.com/r/ex30/comments/1ehh5tk/installing_custom_apps_with_sw_v14/ 18 | 19 | -------------------------------------------------------------------------------- /app/src/main/java/hu/muzso/fileslauncher/FilesLauncherScreen.java: -------------------------------------------------------------------------------- 1 | package hu.muzso.fileslauncher; 2 | 3 | import android.content.ActivityNotFoundException; 4 | import android.content.ComponentName; 5 | import android.content.Intent; 6 | import android.content.pm.PackageManager; 7 | import android.util.Log; 8 | 9 | import androidx.annotation.NonNull; 10 | import androidx.car.app.CarContext; 11 | import androidx.car.app.Screen; 12 | import androidx.car.app.model.Action; 13 | import androidx.car.app.model.CarColor; 14 | import androidx.car.app.model.MessageTemplate; 15 | import androidx.car.app.model.Template; 16 | 17 | /** 18 | * A screen that shows a simple "Launching Files app" message. 19 | * 20 | *

See {@link FilesLauncherService} for the app's entry point to the car host. 21 | */ 22 | public class FilesLauncherScreen extends Screen { 23 | private static final String TAG = "FilesLauncherScreen"; 24 | private static final String[][] PACKAGES = new String[][] { 25 | new String[]{ "com.android.documentsui", "com.android.documentsui.files.FilesActivity" }, 26 | new String[]{ "com.android.documentsui", "com.android.documentsui.LauncherActivity" }, 27 | new String[]{ "com.google.android.documentsui", "com.android.documentsui.LauncherActivity" } 28 | }; 29 | 30 | private final CarContext mCarContext; 31 | 32 | public FilesLauncherScreen(@NonNull CarContext carContext) 33 | { 34 | super(carContext); 35 | mCarContext = carContext; 36 | } 37 | 38 | private void onClickListener() { 39 | Log.i(TAG, "onClickListener is starting"); 40 | PackageManager pm = mCarContext.getPackageManager(); 41 | StringBuilder errorMsgBuilder = new StringBuilder(100); 42 | boolean success = false; 43 | if (pm != null) { 44 | for (int i = 0; i < PACKAGES.length; i++) { 45 | String packageName = PACKAGES[i][0]; 46 | String activityClassName = PACKAGES[i][1]; 47 | Log.i(TAG, "invoking getLaunchIntentForPackage() for \"" + packageName + "\" package"); 48 | Intent intent = null; 49 | try { 50 | intent = pm.getLaunchIntentForPackage(packageName); 51 | if (intent == null) { 52 | Log.i(TAG, "invoking getLaunchIntentForPackage() for \"" + packageName + "\" package returned null"); 53 | } 54 | } catch (Exception e) { 55 | errorMsgBuilder.append(mCarContext.getString(R.string.error_exception_for_package, i+1, packageName, "PackageManager.getLaunchIntentForPackage()", e.getMessage())); 56 | } 57 | if (intent != null) { 58 | try { 59 | ComponentName componentName = intent.getComponent(); 60 | activityClassName = componentName.getClassName(); 61 | } catch (Exception e) { 62 | errorMsgBuilder.append(mCarContext.getString(R.string.error_exception_get_activity_class, i+1, packageName, e.getMessage())); 63 | } 64 | } else { 65 | Log.i(TAG, "getLaunchIntentForPackage() did not return intent for \"" + packageName + "\" package, adding \"" + activityClassName + "\" activity"); 66 | intent = new Intent(); 67 | try { 68 | intent.setClassName(packageName, activityClassName); 69 | try { 70 | intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 71 | } catch (Exception e) { 72 | errorMsgBuilder.append(mCarContext.getString(R.string.error_exception_for_package_and_activity, i+1, packageName, activityClassName, "Intent.addFlags()", e.getMessage())); 73 | } 74 | } catch (Exception e) { 75 | errorMsgBuilder.append(mCarContext.getString(R.string.error_exception_for_package_and_activity, i+1, packageName, activityClassName, "Intent.setClassName()", e.getMessage())); 76 | } 77 | } 78 | Log.i(TAG, "before startActivity()"); 79 | try { 80 | mCarContext.startActivity(intent); 81 | success = true; 82 | Log.i(TAG, "startActivity() was successful"); 83 | break; 84 | } catch (ActivityNotFoundException e) { 85 | Log.i(TAG, "no activity was found for \"" + packageName + "\" package and \"" + activityClassName + "\" activity"); 86 | } catch (Exception e) { 87 | errorMsgBuilder.append(mCarContext.getString(R.string.error_exception_for_package_and_activity, i+1, packageName, activityClassName, "CarContext.startActivity()", e.getMessage())); 88 | } 89 | Log.i(TAG, "after startActivity()"); 90 | } 91 | if (!success) { 92 | errorMsgBuilder.append("\n"); 93 | errorMsgBuilder.append(mCarContext.getString(R.string.error_failure_lead)); 94 | for (int i = 0; i < PACKAGES.length; i++) { 95 | String[] packageSpec = PACKAGES[i]; 96 | errorMsgBuilder.append("\n\n"); 97 | errorMsgBuilder.append(mCarContext.getString(R.string.error_failure_package, i+1, packageSpec[0], packageSpec[1])); 98 | } 99 | } 100 | } else { 101 | errorMsgBuilder.append("\n"); 102 | errorMsgBuilder.append(mCarContext.getString(R.string.error_package_manager)); 103 | } 104 | if (errorMsgBuilder.length() > 0) { 105 | Log.e(TAG, "Error(s):" + errorMsgBuilder); 106 | 107 | StringBuilder finalMsg = new StringBuilder(errorMsgBuilder.length() + 100); 108 | if (success) { 109 | finalMsg.append(mCarContext.getString(R.string.success_with_error)); 110 | } else { 111 | finalMsg.append(mCarContext.getString(R.string.failure_with_error)); 112 | } 113 | finalMsg.append("\n"); 114 | finalMsg.append(mCarContext.getString(R.string.issue_reporting_notice, mCarContext.getString(R.string.github_url), mCarContext.getString(R.string.reddit_url))); 115 | finalMsg.append("\n\n"); 116 | finalMsg.append(errorMsgBuilder); 117 | getScreenManager().push(new ResultScreen(mCarContext, finalMsg.toString())); 118 | } 119 | Log.i(TAG, "onClickListener is finished"); 120 | } 121 | 122 | @NonNull 123 | @Override 124 | public Template onGetTemplate() { 125 | Action action = new Action.Builder() 126 | .setTitle(mCarContext.getString(R.string.launcher_button_label)) 127 | .setBackgroundColor(CarColor.BLUE) 128 | .setOnClickListener(() -> onClickListener()) 129 | .build(); 130 | 131 | return new MessageTemplate.Builder(mCarContext.getString(R.string.launcher_message)) 132 | .addAction(action) 133 | .setHeaderAction(Action.APP_ICON) 134 | .build(); 135 | } 136 | } 137 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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