Stericraft
May 8, 2024
153 views
0 votes
2 Answers

This is my first time asking a question on stack overflow, let me know if I missed mandatory informations.
I’ll try to summarize efficiently.

The goal

I’m coding a Unity Android App, in which I want to implement an auto-update functionnality.
After Unity has downloaded the updated version of my app from a server, I want it to open it programmaticaly.

On Unity side, everything works fine (I can call custom made java functions from my *.aar file).
On Android Studio side (which I’m using for the first time), I’m implementing a "OpenApk()" method.

My code

Here is what I import to use Android tools:

import androidx.core.content.FileProvider;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import java.io.File;

Here is my function in Android Studio:

public void openApkFile(String _filePath) {
    try {
        File apkFullPath = new File(context.getFilesDir() + File.separator + _filePath);
        Uri apkUri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", apkFullPath);
        Intent intent = new Intent(Intent.ACTION_VIEW);

        intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

        context.startActivity(intent);
    }
    catch (Exception e) {
        printToastMessage(e.toString(), true);
    }
}

Here is my AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.opu.intranet"> <!-- I ADDED MY PACKAGE NAME HERE -->
    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />

    <!-- ADDING THIS PROVIDER VIA XML PREVENTS APP FROM RUNNING (CRASH ON EXECUTION) -->
    <application>
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>
    </application>
</manifest>

Also I added:

android.useAndroidX=true # WAS ALREADY PRESENT BY DEFAULT
android.enableJetifier=true

to gradle.properties.

Le problem

Whenever I build my *.aar package and add it to Unity, if the AndroidManifest.xml file contains , the app won’t run anymore on my phone.
It closes immediately after opening, and the OS asks me to wait for the developer to solve the problem haha.

[EDIT]: Thanks to "Retire Ninja"’s comment, I discovered "logcat"…
Here is the error log:

FATAL EXCEPTION: main
Process: com.opu.securityconcilapp, PID: 29513
java.lang.RuntimeException: Unable to get provider androidx.core.content.FileProvider: java.lang.ClassNotFoundException: Didn’t find class "androidx.core.content.FileProvider" on path: DexPathList[[zip file "/data/app/~~jLNBDfF2HmsctyymOxViwQ==/com.opu.securityconcilapp-bZsahkZ0i3R7T1ZoK0sdTw==/base.apk"],nativeLibraryDirectories=[/data/app/~~jLNBDfF2HmsctyymOxViwQ==/com.opu.securityconcilapp-bZsahkZ0i3R7T1ZoK0sdTw==/lib/arm64, /data/app/~~jLNBDfF2HmsctyymOxViwQ==/com.opu.securityconcilapp-bZsahkZ0i3R7T1ZoK0sdTw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/system_ext/lib64]] at android.app.ActivityThread.installProvider(ActivityThread.java:8463)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:7963)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:7649)
at android.app.ActivityThread.-$$Nest$mhandleBindApplication(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2478)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:230)
at android.os.Looper.loop(Looper.java:319)
at android.app.ActivityThread.main(ActivityThread.java:8893)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:608)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
Caused by: java.lang.ClassNotFoundException: Didn’t find class "androidx.core.content.FileProvider" on path: DexPathList[[zip file "/data/app/~~jLNBDfF2HmsctyymOxViwQ==/com.opu.securityconcilapp-bZsahkZ0i3R7T1ZoK0sdTw==/base.apk"],nativeLibraryDirectories=[/data/app/~~jLNBDfF2HmsctyymOxViwQ==/com.opu.securityconcilapp-bZsahkZ0i3R7T1ZoK0sdTw==/lib/arm64, /data/app/~~jLNBDfF2HmsctyymOxViwQ==/com.opu.securityconcilapp-bZsahkZ0i3R7T1ZoK0sdTw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/system_ext/lib64]] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:259)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.AppComponentFactory.instantiateProvider(AppComponentFactory.java:147)
at android.app.ActivityThread.installProvider(ActivityThread.java:8447)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:7963)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:7649)
at android.app.ActivityThread.-$$Nest$mhandleBindApplication(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2478)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:230)
at android.os.Looper.loop(Looper.java:319)
at android.app.ActivityThread.main(ActivityThread.java:8893)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:608)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)

Software versions

Unity: 2022.3.20f1
Android Studio: 2023.2.1
Gradle: 7.1.2 on Unity side, 8.4 on Android Studio side
Android: 14 (API 34)

Target SDK : API 24 or higher

Fix attempts

I spent 2 days reading similar discussions about this everywhere, and testing multiple combinations. I even unzipped AndroidFileOpener (See here) by Mihail5412, a plugin I used before but stopped working after a while (Unity Editor package rename errors).

I tried removing "enableJetifier=true", using "android.support.v4.content.FileProvider" instead of "androidx.core.content.FileProvider" (with the required *.jar library added to the project but it created duplicates with androidx.core).

A huge thanks to anyone who will take the time to read me, please be sure I’ll follow that thread with attention.
Best regards.

Answers

Chosen as BEST ANSWER
- Stericraft
- May 8, 2024 at 2:26 pm
- 0 votes
0
I fixed the problem, a huge thanks to Bob Smith, Retired Ninja for their help here, and to Tomas1856 member of Unity Dev team on this thread.

I have to add:

-keep class androidx.core.content.FileProvider { *; }

to proguard-user.txt, file to enable via Unity->Edit->Projects Settings->Player->Publishing Settings->Custom Proguard File. The file path is then showed by Unity below the toggle button.

I also had to add:
```
android.useAndroidX=true
android.enableJetifier=true
```
to gradleTemplate.properties, file to enable via Unity->Edit->Projects Settings->Player->Publishing Settings->Custom Gradle Properties Template.

Final Android Studio AndroidManifest.xml configuration is:
```
<application>
    <provider
        android:name="androidx.core.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths" />
    </provider>
</application>
```
I still have issues with file path configuration to allow the plugin to open the APK (Failed to find configured root that contains [...]), but I'll ask a new question for that, since it is off topic.

(Edit)

Try this solution:

src/main/res/xml/file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-files-path name="images" path="Pictures" />
</paths>

src/main/AndroidManifest.xml

<provider
    android:name="com.image.crop.lib.DocumentScannerFileProvider"
    android:authorities="com.image.crop.provider"
    android:exported="false"
    android:grantUriPermissions="true">
  <meta-data
      android:name="android.support.FILE_PROVIDER_PATHS"
      android:resource="@xml/file_paths" />
</provider>

src/main/java/com/image/crop/lib/DocumentScannerFileProvider.kt

package com.image.crop.lib

import androidx.core.content.FileProvider

class DocumentScannerFileProvider : FileProvider() {}

How to use

Intent intent = new Intent(Intent.ACTION_VIEW);
File apkFullPath = new File(context.getFilesDir() + File.separator + _filePath);
apkFullPath = photoFile.absolutePath
val apkUri: Uri = FileProvider.getUriForFile(
    activity, "com.image.crop.provider", apkFullPath
)
intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
intent.putExtra(MediaStore.EXTRA_OUTPUT, apkUri)
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

context.startActivity(intent);

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Android Studio – Why adding a FileProvider via AndroidManifest.xml prevents my app from running?