Я занимаюсь разработкой проекта Android для получения сигнала Bluetooth от устройства Bluetooth h6. Затем сохраните эти данные в моем приложении как внутренне. Теперь я могу получить данные с устройства. Но я все еще не могу сохранить данные внутри. В этом коде происходит ошибка компиляции. Я не могу понять, как решить эту ошибку. Я использую Android Studio 3.1.2 и 27 версию Api. Моя Java-треска
package com.example.randikawann.androidbluetoothh6;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.media.MediaScannerConnection;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;
import java.io.FileOutputStream;
import java.io.FileWriter;
public class MainActivity extends AppCompatActivity {
// private final String DEVICE_NAME="MyBTBee";
private final String DEVICE_ADDRESS="20:15:07:27:46:85";
private final UUID PORT_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");//Serial Port Service ID
private static final String TAG = "MyActivity";
private BluetoothDevice device;
private BluetoothSocket socket;
private OutputStream outputStream;
private InputStream inputStream;
Button startButton, sendButton,clearButton,stopButton;
TextView textView;
EditText editText;
boolean deviceConnected=false;
Thread thread;
byte buffer[];
int bufferPosition;
boolean stopThread;
String string;
private static final String FILE_NAME = "example.txt";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startButton = (Button) findViewById(R.id.buttonStart);
sendButton = (Button) findViewById(R.id.buttonSend);
clearButton = (Button) findViewById(R.id.buttonClear);
stopButton = (Button) findViewById(R.id.buttonStop);
editText = (EditText) findViewById(R.id.editText);
textView = (TextView) findViewById(R.id.textView);
setUiEnabled(false);
}
public void setUiEnabled(boolean bool)
{
startButton.setEnabled(!bool);
sendButton.setEnabled(bool);
stopButton.setEnabled(bool);
textView.setEnabled(bool);
}
public boolean BTinit()
{
boolean found=false;
BluetoothAdapter bluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(getApplicationContext(),"Device doesnt Support Bluetooth",Toast.LENGTH_SHORT).show();
}
if(!bluetoothAdapter.isEnabled())
Toast.makeText(getApplicationContext(),"Bluetooth adapter not anabled",Toast.LENGTH_SHORT).show();
{
Intent enableAdapter = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableAdapter, 0);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
Set<BluetoothDevice> bondedDevices = bluetoothAdapter.getBondedDevices();
Toast.makeText(getApplicationContext(),"find bounded device",Toast.LENGTH_SHORT).show();
if(bondedDevices.isEmpty())
{
Toast.makeText(getApplicationContext(),"Please Pair the Device first",Toast.LENGTH_SHORT).show();
}
else
{
for (BluetoothDevice iterator : bondedDevices)
{
if(iterator.getAddress().equals(DEVICE_ADDRESS))
{
device=iterator;
found=true;
break;
}
}
}
return found;
}
public boolean BTconnect()
{
boolean connected=true;
try {
socket = device.createRfcommSocketToServiceRecord(PORT_UUID);
socket.connect();
} catch (IOException e) {
e.printStackTrace();
connected=false;
}
if(connected)
{
try {
outputStream=socket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
try {
inputStream=socket.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}
}
return connected;
}
public void onClickStart(View view) {
if(BTinit())
{
if(BTconnect())
{
setUiEnabled(true);
deviceConnected=true;
beginListenForData();
textView.append("\nConnection Opened!\n");
}
}
}
void beginListenForData()
{
final Handler handler = new Handler();
stopThread = false;
buffer = new byte[1024];
Thread thread = new Thread(new Runnable()
{
public void run()
{
while(!Thread.currentThread().isInterrupted() && !stopThread) {
try {
int byteCount = inputStream.available();
if (byteCount > 0) {
byte[] rawBytes = new byte[byteCount];
inputStream.read(rawBytes);
string = new String(rawBytes, "UTF-8");
handler.post(new Runnable() {
public void run() {
textView.setText(string);
Log.i(TAG, "***************************" + string);
//store value from file
save();
}
});
}
} catch (IOException ex) {
stopThread = true;
}
}
}
});
thread.start();
}
//Save input value
public void save() {
String text = string;
FileOutputStream fos = null;
try {
fos = openFileOutput(FILE_NAME, MODE_PRIVATE);
fos.write(text.getBytes());
Toast.makeText(this, "Saved to " + getFilesDir() + "/" + FILE_NAME,
Toast.LENGTH_LONG).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//Read saved files
public void load(View v) {
FileInputStream fis = null;
try {
fis = openFileInput(FILE_NAME);
InputStreamReader isr = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
String text;
while ((text = br.readLine()) != null) {
sb.append(text).append("\n");
}
editText.setText(sb.toString());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public void onClickSend(View view) {
String string = editText.getText().toString();
string.concat("\n");
try {
outputStream.write(string.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
textView.append("\nSent Data:"+string+"\n");
}
public void onClickStop(View view) throws IOException {
stopThread = true;
outputStream.close();
inputStream.close();
socket.close();
setUiEnabled(false);
deviceConnected=false;
textView.append("\nConnection Closed!\n");
}
public void onClickClear(View view) {
textView.setText("");
}
}
Также мой xml-файл активности -
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:minHeight="14dp"
tools:context=".MainActivity"
tools:layout_editor_absoluteY="81dp">
<EditText
android:id="@+id/editText"
android:layout_width="364dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:layout_marginTop="70dp"
android:inputType=""
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/buttonStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/editText"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:layout_marginTop="50dp"
android:onClick="onClickStart"
android:text="@string/begin"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:ignore="OnClick" />
<Button
android:id="@+id/buttonSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText"
android:layout_marginEnd="196dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="196dp"
android:layout_marginStart="5dp"
android:layout_marginTop="50dp"
android:layout_toEndOf="@+id/buttonStart"
android:layout_toRightOf="@+id/buttonStart"
android:onClick="onClickSend"
android:text="@string/send"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/buttonStart"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:ignore="OnClick,UnknownId" />
<Button
android:id="@+id/button0Stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText"
android:layout_marginLeft="5dp"
android:layout_marginStart="5dp"
android:layout_marginTop="50dp"
android:layout_toEndOf="@+id/buttonSend"
android:layout_toRightOf="@+id/buttonSend"
android:onClick="onClickStop"
android:text="@string/stop"
app:layout_constraintStart_toEndOf="@+id/buttonSend"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:ignore="OnClick" />
<Button
android:id="@+id/buttonClear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText"
android:layout_marginLeft="5dp"
android:layout_marginStart="5dp"
android:layout_marginTop="50dp"
android:onClick="onClickClear"
android:text="@string/clear"
app:layout_constraintStart_toEndOf="@+id/button0Stop"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:ignore="OnClick" />
<TextView
android:id="@+id/textView"
android:layout_width="183dp"
android:layout_height="111dp"
android:layout_marginEnd="157dp"
android:layout_marginRight="157dp"
android:layout_marginTop="92dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/buttonStart" />
</android.support.constraint.ConstraintLayout>
, а также ошибка компиляции 
. Я надеюсь, что ваш непосредственный ответ