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I want to install an apk programmatically on Android 7. As I searched I have to use provider for that, but the app keeps crashing. I will be thankful if anyone could tell me why.

Android manifest: (inside application tag)

 <provider
 android:name=".GenericFileProvider"
 android:authorities="com.hamed.demo"
 android:exported="false"
 android:grantUriPermissions="true">
 <meta-data
 android:name="android.support.FILE_PROVIDER_PATHS"
 android:resource="@xml/provider_paths"/>
 </provider>

code to install:

Intent install = new Intent(Intent.ACTION_VIEW);
install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
install.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
// the following line crashes
Uri apkUri = FileProvider.getUriForFile(AppsList.this,
BuildConfig.APPLICATION_ID + ".provider", file);
install.setDataAndType(apkUri, downloadManager[0].getMimeTypeForDownloadedFile(downloadId));
startActivity(install);

provider_path.xml in res/xml:

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
 <external-path name="external_files" path="."/>
</paths>

and my GenericFileProvider class is exatly form here

But when it reaches the line I added comment on, app crashes and I face this error:

E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.hamed.demo, PID: 13090
 java.lang.RuntimeException: Error receiving broadcast Intent act=android.intent.action.DOWNLOAD_COMPLETE flg=0x10000011 pkg=com.hamed.demo (has extras) in com.hamed.demo.AppsList$6@ce55de9
 at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:1153)
 at android.os.Handler.handleCallback(Handler.java:751)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:241)
 at android.app.ActivityThread.main(ActivityThread.java:6274)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.PackageItemInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
 at android.support.v4.content.FileProvider.parsePathStrategy(FileProvider.java:584)
 at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:558)
 at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:400)
 at com.hamed.demo.AppsList$6.onReceive(AppsList.java:217)
 at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:1143)
 at android.os.Handler.handleCallback(Handler.java:751) 
 at android.os.Handler.dispatchMessage(Handler.java:95) 
 at android.os.Looper.loop(Looper.java:241) 
 at android.app.ActivityThread.main(ActivityThread.java:6274) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

If that matters, the downloaded apk is located in downloads directory of internal storage of the device.

Thanks

Try to use this code

File file = new File(
 Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),
 "app.apk");

 final Uri uri = Uri.fromFile(file);
 final String AUTHORITY = "com.company.app.update.provider";

 if (file.exists())
 file.delete();

 DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
 DownloadManager.Request request = new DownloadManager.Request(
 Uri.parse("https://example.com/app.apk"));
 request.setDestinationUri(uri);
 downloadManager.enqueue(request);

 final BroadcastReceiver onComplete = new BroadcastReceiver() 

 public void onReceive(Context context, Intent intent) 

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) 

 Uri contentUri = FileProvider.getUriForFile(context, AUTHORITY, file);
 Intent openFileIntent = new Intent(Intent.ACTION_VIEW)
 .setDataAndType(contentUri, "application/vnd.android.package-archive")
 .addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
 .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 startActivity(openFileIntent);
 unregisterReceiver(this);
 finish();

 else 

 Intent openFileIntent = new Intent(Intent.ACTION_VIEW)
 .setDataAndType(uri, "application/vnd.android.package-archive")
 .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 startActivity(openFileIntent);
 unregisterReceiver(this);
 finish();
 
 
 ;

 registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));