与SPP蓝牙设备配对会损坏Samsung Galaxy SAndroid 2.2

问题描述

| 我已经为Android编写了一个应用，该应用尝试使用一些简单的代码连接到串行蓝牙设备：

UUID wellKNownSerialUuid = UUID.fromString(\"00001101-0000-1000-8000-00805F9B34FB\");
BluetoothDevice device = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(\"ff:ff:ff:ff:ff:ff\"); // fake address :)
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(wellKNownSerialUuid);
socket.connect();
socket.close();

这段代码在LG Optimus One（运行Android 2.2）上运行良好。但是，它在具有以下调用堆栈的Samsung galaxy S（也运行Android 2.2）上崩溃：

FATAL EXCEPTION: main
ComponentInfo{com.android.settings/com.android.settings.bluetooth.BluetoothPairingDialog}: java.lang.NullPointerException
 at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2663)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
 at android.app.ActivityThread.access$2300(ActivityThread.java:125)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loop(Looper.java:123)
 at android.app.ActivityThread.main(ActivityThread.java:4627)
 at java.lang.reflect.Method.invokeNative(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:521)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
 at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
 at com.android.settings.bluetooth.BluetoothPairingDialog.isDeviceKeyboard(BluetoothPairingDialog.java:343)
 at com.android.settings.bluetooth.BluetoothPairingDialog.createView(BluetoothPairingDialog.java:222)
 at com.android.settings.bluetooth.BluetoothPairingDialog.createuserEntryDialog(BluetoothPairingDialog.java:191)
 at com.android.settings.bluetooth.BluetoothPairingDialog.onCreate(BluetoothPairingDialog.java:139)
 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
 at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2627)

.connect（）方法被阻止时，将发生此崩溃。在BluetoothPairingDialog.java行343的isDeviceKeyboard（）中发生NullPointerException，该过程正在尝试在connect（）调用期间显示蓝牙配对对话框的过程。我一直在尝试在网络上查找该文件的来源，但只打开了不正确的BluetoothPairingDialog.java版本（没有第343行）（例如，通过GrepCode）。 谁能指出我的正确信息来源，或者甚至更好地提出我如何解决此崩溃的建议？我不认为我对配对对话框的显示有任何控制权（出于安全原因）...     

解决方法

        请尝试以下操作以获取套接字：

        // First method to create Bluetooth socket
        Method m = null;
        try {
            m = device.getClass().getMethod(\"createRfcommSocket\",new Class[] {int.class});
            socket = (BluetoothSocket) m.invoke(device,1);
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        // Second method to create Bluetooth socket
        // If the previous was unsuccessful,use yours here

我有一个单独的

boolean connectSocket() {}

方法，该方法检查套接字是否可以打开，如果返回false，则使用您发布的方法。这解决了我在Galaxy手机上发生的崩溃（需要两种方法）。