通过蓝牙从arduino接收android上的数据

嗨，我的问题是我无法从arduino到android获取数据。其概念是在android上显示arduino的价值。你有从arduino接收android数据的代码吗

这是我的密码

包com.example.ardinosensors

import java.util.Set;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;


public class DeviceListActivity extends Activity {
// Debugging for LOGCAT
private static final String TAG = "DeviceListActivity";
private static final boolean D = true;



 // declare button for launching website 
and textview for connection status
Button tlbutton;
TextView textView1;

// EXTRA string to send on to mainactivity
public static String EXTRA_DEVICE_ADDRESS = "device_address";

// Member fields
private BluetoothAdapter mBtAdapter;
private ArrayAdapter<String> mPairedDevicesArrayAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.device_list);
}

@Override
public void onResume()
{
    super.onResume();
    //***************
    checkBTState();

    textView1 = (TextView) findViewById(R.id.connecting);
    textView1.setTextSize(40);
    textView1.setText(" ");

    // Initialize array adapter for paired devices
    mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);

    // Find and set up the ListView for paired devices
    ListView pairedListView = (ListView)  

    findViewById(R.id.paired_devices);
    pairedListView.setAdapter(mPairedDevicesArrayAdapter);
    pairedListView.setOnItemClickListener(mDeviceClickListener);

    // Get the local Bluetooth adapter
    mBtAdapter = BluetoothAdapter.getDefaultAdapter();

    // Get a set of currently paired devices and append to '
    pairedDevices'
    Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();

    // Add previosuly paired devices to the array
    if (pairedDevices.size() > 0) {




   findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE)
   ;//make title viewable
        for (BluetoothDevice device : pairedDevices) {
            mPairedDevicesArrayAdapter.add(device.getName() + "\n" +   
   device.getAddress());
        }
    } else {
        String noDevices = 
   getResources().getText(R.string.none).toString();
        mPairedDevicesArrayAdapter.add(noDevices);
    }
    }

   // Set up on-click listener for the list (nicked this - unsure)
   private OnItemClickListener mDeviceClickListener = new 
   OnItemClickListener() {
   public void onItemClick(AdapterView<?> av, View v, int arg2, long 
   arg3) {

        textView1.setText("Connecting...");
        // Get the device MAC address, which is the last 17 chars 
   in the View
        String info = ((TextView) v).getText().toString();
        String address = info.substring(info.length() - 17);

        // Make an intent to start next activity while taking 
    an extra which is the MAC address.
        Intent i = new Intent(DeviceListActivity.this, 
    MainActivity.class);
        i.putExtra(EXTRA_DEVICE_ADDRESS, address);
        startActivity(i);  
    }
    };

    private void checkBTState() {
    // Check device has Bluetooth and that it is turned on
     mBtAdapter=BluetoothAdapter.getDefaultAdapter(); 
    // CHECK THIS OUT THAT IT WORKS!!!
    if(mBtAdapter==null) {
        Toast.makeText(getBaseContext(), 
    "Device does not support Bluetooth", Toast.LENGTH_SHORT).show();
    } else {
      if (mBtAdapter.isEnabled()) {
        Log.d(TAG, "...Bluetooth ON...");
      } else {
        //Prompt user to turn on Bluetooth
        Intent enableBtIntent = new  
     Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, 1);

        }
      }
      }
      }

这是LOGCAT上的错误

02-01 04:45:41.274: W/dalvikvm(1112): threadid=1: thread exiting with uncaught exception (group=0xb3aa8b90)
02-01 04:45:41.304: E/AndroidRuntime(1112): FATAL EXCEPTION: main
02-01 04:45:41.304: E/AndroidRuntime(1112): Process:  com.example.arduinosensors, PID: 1112
02-01 04:45:41.304: E/AndroidRuntime(1112): 
java.lang.RuntimeException:   
Unable to resume activity {com.example.arduinosensors/com.example.arduinosensors.DeviceListActivity}: java.lang.NullPointerException
 02-01 04:45:41.304: E/AndroidRuntime(1112):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2769)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2798)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2231)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.access$700(ActivityThread.java:135)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.os.Handler.dispatchMessage(Handler.java:102)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.os.Looper.loop(Looper.java:137)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.main(ActivityThread.java:4998)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at java.lang.reflect.Method.invokeNative(Native Method)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at java.lang.reflect.Method.invoke(Method.java:515)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at dalvik.system.NativeStart.main(Native Method)
02-01 04:45:41.304: E/AndroidRuntime(1112): Caused by: java.lang.NullPointerException
02-01 04:45:41.304: E/AndroidRuntime(1112):     at com.example.arduinosensors.DeviceListActivity.onResume(DeviceListActivity.java:66)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1192)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.Activity.performResume(Activity.java:5322)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2759)
02-01 04:45:41.304: E/AndroidRuntime(1112):     ... 12 more

转到您在评论中提到的网页中指定的位置。下载zip并使用它从Eclipse中的现有代码创建一个新的android应用程序项目。它应该不会崩溃。我刚试过

更新：

---

出现空指针的原因是仿真器不支持蓝牙，而您正试图访问仿真器上的蓝牙适配器。您可以在中阅读有关emulator限制的更多信息

请发布您的源代码并记录cat堆栈跟踪。你不需要多次复制粘贴你的问题来让它看起来笨重：。哦，对不起，我的错误。这实际上是我的问题嗨小姐我的问题是我无法从arduino到android获取数据。其概念是在android上显示arduino的价值。你有从arduino接收android数据的代码吗？我没有很好地编辑它。我的问题是如何通过蓝牙从arduino接收数据到android？你已经编写了android应用程序吗？我使用了Eclipse。我的代码中有一些错误。你想看看密码吗？好的，妈妈，我试试。谢谢你的评论：妈妈，在你试过之后，你的安卓系统能收到一些数据吗？来自arduino？不，我没有用arduino设备测试。我运行了android应用程序，它没有崩溃。哦，我明白了，妈妈，我试着测试它。谢谢。我可以在测试后再问一次问题吗？是的，如果它有效，你可以接受我的答案，然后再问另一个问题。妈妈，我把它运行到模拟器上，再次出现错误，我想我第一次遇到的错误是一样的。错误也：

02-01 04:45:41.274: W/dalvikvm(1112): threadid=1: thread exiting with uncaught exception (group=0xb3aa8b90)
02-01 04:45:41.304: E/AndroidRuntime(1112): FATAL EXCEPTION: main
02-01 04:45:41.304: E/AndroidRuntime(1112): Process:  com.example.arduinosensors, PID: 1112
02-01 04:45:41.304: E/AndroidRuntime(1112): 
java.lang.RuntimeException:   
Unable to resume activity {com.example.arduinosensors/com.example.arduinosensors.DeviceListActivity}: java.lang.NullPointerException
 02-01 04:45:41.304: E/AndroidRuntime(1112):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2769)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2798)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2231)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.access$700(ActivityThread.java:135)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.os.Handler.dispatchMessage(Handler.java:102)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.os.Looper.loop(Looper.java:137)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.main(ActivityThread.java:4998)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at java.lang.reflect.Method.invokeNative(Native Method)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at java.lang.reflect.Method.invoke(Method.java:515)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at dalvik.system.NativeStart.main(Native Method)
02-01 04:45:41.304: E/AndroidRuntime(1112): Caused by: java.lang.NullPointerException
02-01 04:45:41.304: E/AndroidRuntime(1112):     at com.example.arduinosensors.DeviceListActivity.onResume(DeviceListActivity.java:66)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1192)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.Activity.performResume(Activity.java:5322)
02-01 04:45:41.304: E/AndroidRuntime(1112):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2759)
02-01 04:45:41.304: E/AndroidRuntime(1112):     ... 12 more