파일 권한 얻기 편집하기

파일 권한 얻기

AndroidManifest.xml
<source lang='xml'>
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
</source>

1. Check if permission is already granted
Before attempting file operations, verify if your app has the special access using Environment.isExternalStorageManager(). 
<source lang='kotlin'>
import android.os.Environment
import android.os.Build

private fun hasAllFilesAccess(): Boolean {
    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) { // R is API 30 (Android 11)
        Environment.isExternalStorageManager()
    } else {
        // For devices below Android 11, traditional permissions apply
        // You would check READ/WRITE_EXTERNAL_STORAGE here
        true // Or implement a check for the older permissions
    }
}
</source>

2. Request the permission
If access is not granted, launch an intent to the system settings page where the user can manually enable the permission for your app. 
<source lang='kotlin'>
import android.content.Intent
import android.net.Uri
import android.provider.Settings
import androidx.activity.result.contract.ActivityResultContracts

// Register an Activity Result Launcher to handle the result when the user returns from settings
private val storagePermissionResultLauncher =
    registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
        // When the user returns from the settings screen, check the permission status again
        if (hasAllFilesAccess()) {
            // Permission granted, proceed with your file operations
            println("All files access granted!")
        } else {
            // Permission denied, handle accordingly (e.g., show a dialog)
            println("All files access denied.")
        }
    }

private fun requestAllFilesAccess() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        val intent = Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION)
        val uri = Uri.fromParts("package", packageName, null)
        intent.data = uri
        storagePermissionResultLauncher.launch(intent)
    }
    // No runtime request needed for versions below Android 11
}
</source>


3. Integrate into your Activity
Call these functions within your Activity (e.g., in onCreate or when a specific button is clicked): 
<source lang='kotlin'>
class MainActivity : AppCompatActivity() {

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

        if (!hasAllFilesAccess()) {
            requestAllFilesAccess()
        } else {
            // Permission already granted, perform file operations
        }
    }
    
    // ... include hasAllFilesAccess() and requestAllFilesAccess() functions here ...
}
</source>