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package com.example.myapplication;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Toast;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* src\main\AndroidManifest.xml
* <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
* <application android:requestLegacyExternalStorage="true" ...></application>
*/
public class MainActivity extends AppCompatActivity {
int PERMISSION_REQUEST_CODE = 1;
String fileName = "content.txt";
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), fileName);
String text = "Test string";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onWithoutPermissions(View view) {
writeToFile();
}
public void onWithPermissions(View view) {
if (checkPermission()) {
writeToFile();
} else {
requestPermission();
}
}
private void requestPermission() {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
Toast.makeText(this, "Permissions should be granted", Toast.LENGTH_LONG).show();
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
}
}
private boolean checkPermission() {
int result = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (result == PackageManager.PERMISSION_GRANTED) {
return true;
} else {
return false;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
{
super.onRequestPermissionsResult(requestCode,
permissions,
grantResults);
if (requestCode == PERMISSION_REQUEST_CODE) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(MainActivity.this, "Permission granted", Toast.LENGTH_SHORT) .show();
writeToFile();
}
else {
Toast.makeText(MainActivity.this, "Permission denied", Toast.LENGTH_SHORT) .show();
}
}
}
private void writeToFile() {
try
{
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
fos.write(text.getBytes());
fos.close();
Toast.makeText(this, "Текстовый файл успешно сохранён!", Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e)
{
e.printStackTrace();
Toast.makeText(this, "Файл не найден! " + e.getMessage(), Toast.LENGTH_SHORT).show();
} catch (IOException e)
{
e.printStackTrace();
Toast.makeText(this, "Ошибка сохранения файла! " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
}
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