安卓PackageInstaller安装结果

Question

我使用PackageInstaller和PackageInstaller.Session从我的应用程序安装一个应用程序。当安装失败时，我想在我的应用程序中显示一条消息(例如，在apk的错误签名情况下)。如何获得安装会话的结果？

Answer 1

当您commit()您的Session时，您需要提供一个IntentSender，它指向某个组件，例如一个BroadcastReceiver。在这里，我在installCoroutine()中这样做

/*
  Copyright (c) 2019 CommonsWare, LLC

  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain   a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  Covered in detail in the book _Elements of Android Q

  https://commonsware.com/AndroidQ
*/

package com.commonsware.q.appinstaller

import android.app.Application
import android.app.PendingIntent
import android.content.Intent
import android.content.pm.PackageInstaller
import android.net.Uri
import androidx.documentfile.provider.DocumentFile
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext

private const val NAME = "mostly-unused"
private const val PI_INSTALL = 3439

class MainMotor(app: Application) : AndroidViewModel(app) {
  private val installer = app.packageManager.packageInstaller
  private val resolver = app.contentResolver

  fun install(apkUri: Uri) {
    viewModelScope.launch(Dispatchers.Main) {
      installCoroutine(apkUri)
    }
  }

  private suspend fun installCoroutine(apkUri: Uri) =
    withContext(Dispatchers.IO) {
      resolver.openInputStream(apkUri)?.use { apkStream ->
        val length =
          DocumentFile.fromSingleUri(getApplication(), apkUri)?.length() ?: -1
        val params =
          PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL)
        val sessionId = installer.createSession(params)
        val session = installer.openSession(sessionId)

        session.openWrite(NAME, 0, length).use { sessionStream ->
          apkStream.copyTo(sessionStream)
          session.fsync(sessionStream)
        }

        val intent = Intent(getApplication(), InstallReceiver::class.java)
        val pi = PendingIntent.getBroadcast(
          getApplication(),
          PI_INSTALL,
          intent,
          PendingIntent.FLAG_UPDATE_CURRENT
        )

        session.commit(pi.intentSender)
        session.close()
      }
    }
}

然后，您的组件可以查看EXTRA_STATUS以获得状态：

/*
  Copyright (c) 2019 CommonsWare, LLC

  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain   a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  Covered in detail in the book _Elements of Android Q

  https://commonsware.com/AndroidQ
*/

package com.commonsware.q.appinstaller

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.pm.PackageInstaller
import android.media.AudioManager
import android.media.ToneGenerator
import android.util.Log

private const val TAG = "AppInstaller"

class InstallReceiver : BroadcastReceiver() {
  override fun onReceive(context: Context, intent: Intent) {

    when (val status = intent.getIntExtra(PackageInstaller.EXTRA_STATUS, -1)) {
      PackageInstaller.STATUS_PENDING_USER_ACTION -> {
        val activityIntent =
          intent.getParcelableExtra<Intent>(Intent.EXTRA_INTENT)

        context.startActivity(activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
      }
      PackageInstaller.STATUS_SUCCESS ->
        ToneGenerator(AudioManager.STREAM_NOTIFICATION, 100)
          .startTone(ToneGenerator.TONE_PROP_ACK)
      else -> {
        val msg = intent.getStringExtra(PackageInstaller.EXTRA_STATUS_MESSAGE)

        Log.e(TAG, "received $status and $msg")
      }
    }
  }
}

看起来，STATUS_FAILURE_INVALID将是一个无效签名的签名。