我一直在尝试使用蓝牙在arduino和蓝牙之间进行通信 并且构建时没有错误 告诉我出了什么问题 我遇到了 IO 异常问题，但现在解决了......也许 当我尝试在手机上运行该应用程序时，它崩溃了 帮助我，我不太擅长java
package com.example.administrator.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Bundle;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import java.util.Set;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.InputStream;
import android.os.ParcelUuid;
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_ENABLE_BT = 1;
private Button onBtn, offBtn ,listBtn ,findBtn;
private TextView text;
private Button UpBtn ,DownBtn ,LeftBtn ,RightBtn;
private BluetoothAdapter myBluetoothAdapter;
private Set<BluetoothDevice> pairedDevices;
private ListView myListView;
private ArrayAdapter<String> BTArrayAdapter;
private OutputStream outputStream;
private InputStream inStream;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> bondedDevices = myBluetoothAdapter.getBondedDevices();
if (myBluetoothAdapter == null) {
onBtn.setEnabled(false);
offBtn.setEnabled(false);
listBtn.setEnabled(false);
findBtn.setEnabled(false);
UpBtn.setEnabled(false);
DownBtn.setEnabled(false);
LeftBtn.setEnabled(false);
RightBtn.setEnabled(false);
text.setText("Status: not supported");
Toast.makeText(getApplicationContext(), "Your device does not support Bluetooth",
Toast.LENGTH_LONG).show();
} else {
if(bondedDevices.size() > 0 ){
BluetoothDevice[] devices = (BluetoothDevice[]) bondedDevices.toArray();
BluetoothDevice device = devices[0];
ParcelUuid[] uuids = device.getUuids();
try{
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(uuids[0].getUuid());
socket.connect();
outputStream = socket.getOutputStream();
inStream = socket.getInputStream();
} catch (IOException e){
}
}
//Movement
UpBtn = (Button) findViewById(R.id.Upbutton);
DownBtn = (Button) findViewById(R.id.Downbutton);
LeftBtn = (Button) findViewById(R.id.Leftbutton);
RightBtn = (Button) findViewById(R.id.Rightbutton);
UpBtn.setOnClickListener(new OnClickListener() {
@Override public void onClick(View v) {
try {
C(v, 8);
}
catch (IOException e ){
System.out.println("3 SEND FAILED");
}
}
});
DownBtn.setOnClickListener(new OnClickListener() {
@Override public void onClick(View v) {
try {
C(v, 2);
} catch (IOException e) {
System.out.println("2 SEND FAILED");
}
}
});
LeftBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
C(v, 4);
} catch (IOException e) {
System.out.println(" 4 SEND FAILED");
}
}
});
RightBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v){
try {
C(v, 6);
} catch (IOException e) {
System.out.println(" 6 SEND FAILED");
}
}
}
);
//.........................
//..................
//Normal Code
text = (TextView) findViewById(R.id.textView);
//text.setText ( "" + myBluetoothAdapter.getName());
onBtn = (Button) findViewById(R.id.Onbutton);
onBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
on(v);
}
});
offBtn = (Button) findViewById(R.id.Offbutton);
offBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
off(v);
}
});
listBtn = (Button) findViewById(R.id.Listbutton);
listBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
list(v);
}
});
findBtn = (Button) findViewById(R.id.Pairedbutton);
findBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
find(v);
}
});
myListView = (ListView) findViewById(R.id.listView1);
// create the arrayAdapter that contains the BTDevices, and set it to the ListView
BTArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
myListView.setAdapter(BTArrayAdapter);
}
}
public void on(View view) {
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);
Toast.makeText(getApplicationContext(), "Bluetooth turned on",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if (requestCode == REQUEST_ENABLE_BT) {
if (myBluetoothAdapter.isEnabled()) {
text.setText("Status: Enabled");
} else {
text.setText("Status: Disabled");
}
}
}
public void list(View view) {
// get paired devices
pairedDevices = myBluetoothAdapter.getBondedDevices();
// put it's one to the adapter
for (BluetoothDevice device : pairedDevices)
BTArrayAdapter.add(device.getName() + "\n" + device.getAddress());
Toast.makeText(getApplicationContext(), "Show Paired Devices",
Toast.LENGTH_SHORT).show();
}
final BroadcastReceiver bReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// add the name and the MAC address of the object to the arrayAdapter
BTArrayAdapter.add(device.getName() + "\n" + device.getAddress());
BTArrayAdapter.notifyDataSetChanged();
}
}
};
public void find(View view) {
if (myBluetoothAdapter.isDiscovering()) {
// the button is pressed when it discovers, so cancel the discovery
myBluetoothAdapter.cancelDiscovery();
} else {
BTArrayAdapter.clear();
myBluetoothAdapter.startDiscovery();
registerReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
}
public void off(View view) {
myBluetoothAdapter.disable();
text.setText("Status: Disconnected");
Toast.makeText(getApplicationContext(), "Bluetooth turned off",
Toast.LENGTH_LONG).show();
}
public void C (View View , float H) throws IOException{
if(H == 8){
outputStream.write("8".toString().getBytes());
}
if(H == 2){
outputStream.write("2".toString().getBytes());
}
if(H == 4){
outputStream.write("4".toString().getBytes());
}
if(H == 6){
outputStream.write("6".toString().getBytes());
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(bReceiver);
}
}
这是 list
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.administrator.myapplication" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
最佳答案
已解决，只是权限错误 刚刚添加了 bluetooth_admin 权限，它就工作了! 感谢 HaMiD Sani 指出了这一点。
关于java - Android Arduino 蓝牙通信启动时崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34784249/