OK, I've found some answers:
- Can be used for installing/updating APK files, including split-APK files. Maybe even more.
- Yes, but the user will need to confirm, one app after another.
- Maybe if the app is built in.
- Seems it requires to read the entire APK file/s before requesting the user to install.
- Needs permission REQUEST_INSTALL_PACKAGES
- Haven't found any, but someone showed me here how to install split-apk files, and here's how to do it for a single file using SAF, with and without PackageInstaller. Note that this is just a sample. I don't think it's a good practice to do it all on the UI thread.
manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"
package="com.android.apkinstalltest">
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
<application tools:ignore="AllowBackup,GoogleAppIndexingWarning"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<service android:name=".APKInstallService"/>
</application>
</manifest>
APKInstallService
class APKInstallService : Service() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
when (intent.getIntExtra(PackageInstaller.EXTRA_STATUS, PackageInstaller.STATUS_FAILURE)) {
PackageInstaller.STATUS_PENDING_USER_ACTION -> {
Log.d("AppLog", "Requesting user confirmation for installation")
val confirmationIntent = intent.getParcelableExtra<Intent>(Intent.EXTRA_INTENT)
confirmationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
try {
startActivity(confirmationIntent)
} catch (e: Exception) {
}
}
PackageInstaller.STATUS_SUCCESS -> Log.d("AppLog", "Installation succeed")
else -> Log.d("AppLog", "Installation failed")
}
stopSelf()
return START_NOT_STICKY
}
override fun onBind(intent: Intent) = null
}
MainActivity
class MainActivity : AppCompatActivity() {
private lateinit var packageInstaller: PackageInstaller
@TargetApi(Build.VERSION_CODES.O)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
packageInstaller = packageManager.packageInstaller
val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
intent.addCategory(Intent.CATEGORY_OPENABLE)
intent.type = "application/vnd.android.package-archive"
startActivityForResult(intent, 1)
}
// override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
// super.onActivityResult(requestCode, resultCode, resultData)
// if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && requestCode == 1 && resultCode == Activity.RESULT_OK && resultData != null) {
// val uri = resultData.data
// grantUriPermission(packageName, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
// val intent = Intent(Intent.ACTION_INSTALL_PACKAGE)//
// .setDataAndType(uri, "application/vnd.android.package-archive")
// .putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true)
// .putExtra(Intent.EXTRA_RETURN_RESULT, false)
// .addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
// startActivity(intent)
// }
override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
super.onActivityResult(requestCode, resultCode, resultData)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && requestCode == 1 && resultCode == Activity.RESULT_OK && resultData != null) {
val uri = resultData.data ?: return
grantUriPermission(packageName, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
val installParams = PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL)
var cursor: Cursor? = null
var outputStream: OutputStream? = null
var inputStream: InputStream? = null
var session: PackageInstaller.Session? = null
try {
cursor = contentResolver.query(uri, null, null, null, null)
if (cursor != null) {
cursor.moveToNext()
val fileSize = cursor.getLong(cursor.getColumnIndex(DocumentsContract.Document.COLUMN_SIZE))
val fileName = cursor.getString(cursor.getColumnIndex(DocumentsContract.Document.COLUMN_DISPLAY_NAME))
installParams.setSize(fileSize)
cursor.close()
val sessionId = packageInstaller.createSession(installParams)
Log.d("AppLog", "Success: created install session [$sessionId] for file $fileName")
session = packageInstaller.openSession(sessionId)
outputStream = session.openWrite(System.currentTimeMillis().toString(), 0, fileSize)
inputStream = contentResolver.openInputStream(uri)
inputStream.copyTo(outputStream)
session.fsync(outputStream)
outputStream.close()
outputStream = null
inputStream.close()
inputStream = null
Log.d("AppLog", "Success: streamed $fileSize bytes")
val callbackIntent = Intent(applicationContext, APKInstallService::class.java)
val pendingIntent = PendingIntent.getService(applicationContext, 0, callbackIntent, 0)
session!!.commit(pendingIntent.intentSender)
session.close()
session = null
Log.d("AppLog", "install request sent. sessions:" + packageInstaller.mySessions)
}
} catch (e: Exception) {
Log.d("AppLog", "error:$e")
} finally {
outputStream?.close()
inputStream?.close()
session?.close()
cursor?.close()
}
}
}
}
