Android内部存储读取数据权限

Question

我是移动开发的新手。我正在尝试创建一个具有交叉淡出效果的应用程序。但是我需要在打开后没有点击按钮的情况下读取文件。你能帮我解决这个问题吗？这是我的代码。请在添加之后告诉我"READ_EXTERNAL_STORAGE“，我可以读取手机中的所有文件吗？知道这一点很重要，因为我想在我的手机中找到mp3文件并设置它们，而不是按键

package com.example.crossfade

import android.content.Intent
import android.content.pm.PackageManager
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.provider.Settings
import android.widget.Toast
import androidx.annotation.RequiresApi
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.example.crossfade.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity()  {
    override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)

    binding.buttonOneTrack.setOnClickListener {
        if (ContextCompat.checkSelfPermission(
                this, android.Manifest.permission.READ_EXTERNAL_STORAGE) ==
            PackageManager.PERMISSION_GRANTED) {
                onStoragePermissionGranted()
        } else {
            ActivityCompat.requestPermissions(
                this, arrayOf(android.Manifest.permission.READ_EXTERNAL_STORAGE),
                RQ_PERMISSION_FOR_BUTTON_1
            )
        }
    }
    binding.buttonTwoTrack.setOnClickListener {

    }
}
    @RequiresApi(Build.VERSION_CODES.M)
    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when (requestCode) {
            RQ_PERMISSION_FOR_BUTTON_1 -> {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    onStoragePermissionGranted()
                } else {
                    if (!shouldShowRequestPermissionRationale(android.Manifest.permission.READ_EXTERNAL_STORAGE)) {
                         askUserForOpeningSettings()
                    } else {
                        Toast.makeText(this, "Спасибо, мы можем продолжать", Toast.LENGTH_SHORT).show()
                    }
                }
        }
    }
}

private fun askUserForOpeningSettings() {
    val appSettingsIntent = Intent(
        Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
        Uri.fromParts("package", packageName, null)
    )
    if (packageManager.resolveActivity(appSettingsIntent, PackageManager.MATCH_DEFAULT_ONLY) == null) {
        Toast.makeText(this, "Ура! Ну наконец-то!", Toast.LENGTH_SHORT).show()
    }    else {
        AlertDialog.Builder(this)
            .setTitle("Нужно разрешение")
            .setMessage("Надо зайти в настройки и включить. Подробно лень писать")
            .setPositiveButton("Open") {_, _ ->
                startActivity(appSettingsIntent)
            }
            .create()
            .show()
    }
}

private companion object {
    const val RQ_PERMISSION_FOR_BUTTON_1 = 1
    const val RQ_PERMISSION_FOR_BUTTON_2 = 2
    }
private fun onStoragePermissionGranted() {
    Toast.makeText(this,"Спасибо, мы можем продолжать!", Toast.LENGTH_SHORT).show()
}

Answer 1

不是的。你永远无法读取你手机上的所有文件--每个应用程序都有自己的私人存储空间，除非他们允许，否则其他人无法读取他们的文件。无视这一点-不。在Android11之前还没有。请参阅https://developer.android.com/about/versions/11/privacy/storage和https://developer.android.com/training/data-storage/manage-all-files