Android - 单击按钮时未显示权限对话框

Question

In my application, i need to request write and read permission from the storage. Since i want to show the user that the app needs these permissions, i have created and Activity containing a button, which on click, should call the Storage permission Dialog.

However, since the recent Android changes, this doesnt work anymore.

Is there a new (and clean) way to ask permission? Am i doing something wrong?

I have added the uses-permission line inside the AndroidManifest.xml :

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

This is the code inside the Activity:

class ActivityPermission : AppCompatActivity() {

    companion object {
        var PERMISSION_REQUEST_CODE = 12
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityPermissionBinding.inflate(layoutInflater)

        setContentView(R.layout.activity_permission)

        binding.btnPermission.setOnClickListener {
            ActivityCompat.requestPermissions(this, arrayOf(
                    android.Manifest.permission.READ_EXTERNAL_STORAGE,
                    android.Manifest.permission.WRITE_EXTERNAL_STORAGE),
                    PERMISSION_REQUEST_CODE)
        }
    }

    override fun onRequestPermissionsResult(
            requestCode: Int,
            permissions: Array<out String>,
            grantResults: IntArray
    ) {
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if(grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, getString(R.string.permissiongranted), Toast.LENGTH_SHORT).show();
                finish()
            } else {
                Toast.makeText(this, getString(R.string.permissiondenied), Toast.LENGTH_SHORT).show();
            }
        }
    }
}

Answer 1

Thanks to everyone for helping me discover more about Android Permissions.

I decided to change the way i ask for the permission. Instead of an Activity, i decided to use a Fragment instead ( "show an educational UI to the user. In this UI, describe why the feature, which the user wants to enable, needs a particular permission." - source | Thanks to @Michael in the comments for pointing it out).

Since now im using a Fragment, i have to use requestPermissions (Thanks to this reply ). This now works flawlessly without any issues.

Turns out you need a combination of checks when trying to request a permission. You have to first check if the permission is actually enabled with checkSelfPermission , so you can easily choose where the user should go to start using the app.