Question

我正在使用仿真器，并以这种方式发送意图：

StorageManager sm = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
Intent i;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
   i = sm.getPrimaryStorageVolume().createOpenDocumentTreeIntent();
} else {
   return null;
}
i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
i.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);

和onActivityResult()中的

：

Uri uri = data.getData();
if (uri == null)
    return null;
context.getContentResolver()
                .takePersistableUriPermission(uri,
                        Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

每次我重新启动时，该应用都无权访问。谁能在模拟器的Beta 6上确认此错误？我做错什么了吗？

Answer 1

我将您的代码段转换为Kotlin活动：

package com.commonsware.jetpack.myapplication

import android.content.Context
import android.content.Intent
import android.content.SharedPreferences
import android.net.Uri
import android.os.Bundle
import android.os.storage.StorageManager
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.documentfile.provider.DocumentFile

private const val PREF_URI = "uri"
private const val REQUEST_SAF = 1337

class MainActivity : AppCompatActivity() {
  private val prefs: SharedPreferences by lazy {
    getSharedPreferences("test", Context.MODE_PRIVATE)
  }

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    val uriString = prefs.getString(PREF_URI, null)
    val storageManager = getSystemService(StorageManager::class.java)!!

    if (uriString == null) {
      startActivityForResult(
        storageManager.primaryStorageVolume.createOpenDocumentTreeIntent(),
        REQUEST_SAF
      )
    } else {
      val uri = Uri.parse(uriString)
      val docFile = DocumentFile.fromTreeUri(this, uri)

      Toast.makeText(
        this,
        "canRead: ${docFile?.canRead()} canWrite: ${docFile?.canWrite()}",
        Toast.LENGTH_LONG
      ).show()
    }
  }

  override fun onActivityResult(
    requestCode: Int,
    resultCode: Int,
    data: Intent?
  ) {
    val uri = data?.data

    if (uri == null) {
      Toast.makeText(this, "Did not get a Uri??!?", Toast.LENGTH_LONG).show()
    } else {
      contentResolver.takePersistableUriPermission(
        uri,
        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
      )

      prefs.edit().putString(PREF_URI, uri.toString()).apply()
      Toast.makeText(this, "OK, run the activity again", Toast.LENGTH_LONG).show()
    }

    finish()
  }
}

然后我运行包含此活动作为其启动器活动的应用程序，并选择Downloads/作为文档树。此活动的后续启动-在重新启动之前和之后-显示canRead()和canWrite()均返回true。已在运行Q Beta 6的Google Pixel上进行了测试。

我无法在Q仿真器because Google上尝试此操作，因此无法确认是否可以在此处重现您的行为。但是，这在硬件上可以按预期工作的事实应该是一个积极的信号。

持久权限URI android Q

1 个答案: