junkchen / blelib Goto Github PK

大概在BleService.java的85行 错误代码为 mScanLeDeviceList.clear();
错误信息
Caused by: java.lang.NullPointerException: Attempt to invoke interface method'void java.util.List.clear()' on a null object reference

java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.List.clear()' on a null object reference
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at com.junkchen.blelib.BleService.scanLeDevice(BleService.java:185)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at com.ugobiking.ugobikeapp.module.MainActivity.unlock(MainActivity.java:915)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at com.ugobiking.ugobikeapp.module.MainActivity.onActivityResult(MainActivity.java:798)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.app.Activity.dispatchActivityResult(Activity.java:6805)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.app.ActivityThread.deliverResults(ActivityThread.java:3904)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.app.ActivityThread.handleSendResult(ActivityThread.java:3951)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.app.ActivityThread.-wrap16(ActivityThread.java)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1524)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.os.Handler.dispatchMessage(Handler.java:111)
04-25 14:50:04.544 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.os.Looper.loop(Looper.java:207)
04-25 14:50:04.545 21158-21158/com.ugobiking.ugobikeapp W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5743)
04-25 14:50:04.545 21158-21158/com.ugobiking.ugobikeapp W/System.err: at java.lang.reflect.Method.invoke(Native Method)
04-25 14:50:04.545 21158-21158/com.ugobiking.ugobikeapp W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
04-25 14:50:04.545 21158-21158/com.ugobiking.ugobikeapp W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:766)

蓝牙连接会出现连接断开和失败得问题，那么我请求的问题就是蓝牙连接的失败率和成功率如何优化。

我在帮助中发现了两个关于服务发现的东东
1、可以直接返回服务列表
mBleService.getSupportedGattServices();//获取服务
2、发现服务的的回调函数
//Ble服务发现回调
mBleService.setOnServicesDiscoveredListener(new BleService.OnServicesDiscoveredListener() {
@OverRide
public void onServicesDiscovered(BluetoothGatt gatt, int status) {

}

});

这两个要同时使用吗？还是我使用了1之后2才会监听？
对此有点疑惑，可以帮解答一下吗？

在做一个血压计通信项目，debug后发现 onConnectionStateChange =133
用魅族手机 mx3 （android 5.0） 还有三星s6（�Android 7.0） 测试，一直是133

解决方 将 mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
替换成 mBluetoothGatt = device.connectGatt(this, false, mGattCallback,2);
方法报错的话，忽略
直接编译运行，修改之后，两个手机都可以正常连接

（此问题不知是否跟血压设备有关系，不知其他情况是否适用）

您好，我的app有时候放在那里不动的时候，会报此错误，请问是什么原因啊

AndroidRuntime: FATAL EXCEPTION: main
Process: com.junyuanrobot.aite, PID: 3863
java.lang.NullPointerException: Attempt to invoke interface method 'boolean java.util.List.contains(java.lang.Object)' on a null object reference
at com.junkchen.blelib.BleService$2.onLeScan(BleService.java:468)
at android.bluetooth.BluetoothAdapter$2.onScanResult(BluetoothAdapter.java:1805)
at android.bluetooth.le.BluetoothLeScanner$BleScanCallbackWrapper$1.run(BluetoothLeScanner.java:331)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5275)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:909)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)

在部分Android手机中，发送指令最长只能是20个字节，我的指令带有固定的包头，导致长度超出20个字节，在实际测试中发送指令后经常没有进行回应。而纯粹的将指令拆成两段，设备无法识别指令

mBleService.setOnDataAvailableListener(mOnDataAvailable);
是這段嗎?
寫了沒有接收到東西還是需要其他動作呢?

你好，你的代码很不错，节省了很多时间。但是在使用中发现有些地方还有遗漏。
希望能够尽点微薄之力帮忙完善这个代码

蓝牙调scanLeDevice() 给false为什么不停止扫描设备啊

当我在ubuntu下的Android Studio上运行例子时，出现了如下问题
Error:Execution failed for task ':blelib:processReleaseResources'. > com.android.ide.common.process.ProcessException: Failed to execute aapt
我不知道这是为什么，是因为我的Sdk不同导致的么？

当我切换到Win7下没有上面的问题，但是在手机上运行例子时会闪退（我的是华为手机，Android 6.0）
请问这又是什么原因？

当我简单进行测试的时候，任意调用一个API，都会导致闪退。我已经懵逼了。

mBleService.setCharacteristicNotification();//设置通知
mBleService.readCharacteristic();//读取数据
mBleService.writeCharacteristic();//写入数据
调用以上三个方法却没有任何响应，还请指点一下，谢谢。

我用来扫描开着蓝牙的手机，但是扫不到，是什么原因呢

从手机端断开再连接时没有问题 但是如果先从设备端断开连接再从手机端连接会显示This is device already connected.

private final BluetoothAdapter.LeScanCallback mScanCallback = new BluetoothAdapter.LeScanCallback() {
    @Override
    public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
        if (mScanLeDeviceList.contains(device)) return;
        mScanLeDeviceList.add(device);
        if (mOnLeScanListener != null) {
            mOnLeScanListener.onLeScan(device, rssi, scanRecord);
        }
        broadcastUpdate(ACTION_BLUETOOTH_DEVICE, device);
    }
};

当我扫描设备的时候，我设备发送广播非常快，差不多200ms一次，然后扫描停止的时候程序就崩溃了。

FATAL EXCEPTION: main
Process: com.application.android.box, PID: 10950
java.lang.NullPointerException: Attempt to invoke interface method 'boolean java.util.List.contains(java.lang.Object)' on a null object reference
at com.application.android.box.blelib.BleService$2.onLeScan(BleService.java:464)

这是错误消息！

你好,为什么监听蓝牙的开启关闭,绑定和解绑service会崩溃

11-29 14:16:52.141 3123-3123/com.junkchen.blelib.sample E/AndroidRuntime: FATAL EXCEPTION: main Process: com.junkchen.blelib.sample, PID: 3123 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference at com.junkchen.blelib.sample.BleScanActivity$5.convert(BleScanActivity.java:229) at com.junkchen.blelib.sample.BleScanActivity$5.convert(BleScanActivity.java:226) at com.junkchen.blelib.sample.adapter.CommonAdapter.getView(CommonAdapter.java:55) at android.widget.AbsListView.obtainView(AbsListView.java:2464) at android.widget.ListView.measureHeightOfChildren(ListView.java:1286) at android.widget.ListView.onMeasure(ListView.java:1194) at android.view.View.measure(View.java:17782) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5625) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1692) at android.widget.LinearLayout.measureVertical(LinearLayout.java:760) at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) at android.view.View.measure(View.java:17782) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5625) at android.widget.FrameLayout.onMeasure(FrameLayout.java:459) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:17782) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5625) at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:391) at android.view.View.measure(View.java:17782) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5625) at android.widget.FrameLayout.onMeasure(FrameLayout.java:459) at android.view.View.measure(View.java:17782) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5625) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1692) at android.widget.LinearLayout.measureVertical(LinearLayout.java:760) at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) at android.view.View.measure(View.java:17782) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5625) at android.widget.FrameLayout.onMeasure(FrameLayout.java:459) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2644) at android.view.View.measure(View.java:17782) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2398) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1407) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1631) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1285) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6509) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:821) at android.view.Choreographer.doCallbacks(Choreographer.java:624) at android.view.Choreographer.doFrame(Choreographer.java:593) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:807) at android.os.Handler.handleCallback(Handler.java:815) at android.os.Handler.dispatchMessage(Handler.java:104) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5562) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:968) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:763)

OnDataAvailableListener没有添加onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status)；
读取设备通知的时候将无法获取数据，因此建议在listener中加入该方法，方便进行回调

public void onCharacteristicWrite(BluetoothGatt gatt,
                                      BluetoothGattCharacteristic characteristic, int status) {

        String address = gatt.getDevice().getAddress();
        for (int i = 0; i < characteristic.getValue().length; i++) {
            Log.i(TAG, "address: " + address + ",Write: " + characteristic.getValue()[i]);
        }
        if (mOnDataAvailableListener != null) {
            mOnDataAvailableListener.onCharacteristicWrite(gatt, characteristic, status);
        }

    }

java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.List.clear()' on a null object reference at com.junkchen.blelib.BleService.scanLeDevice(BleService.java:182) at com.junkchen.blelib.BleService.scanLeDevice(BleService.java:204) at com.junkchen.blelib.sample.BleScanActivity.verifyIfRequestPermission(BleScanActivity.java:154) at com.junkchen.blelib.sample.BleScanActivity.access$200(BleScanActivity.java:61) at com.junkchen.blelib.sample.BleScanActivity$3.onClick(BleScanActivity.java:207) at android.view.View.performClick(View.java:4851) at android.view.View$PerformClick.run(View.java:20016) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5481) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:952) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)

我的邮箱[email protected]谢谢了

public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
}
这个函数重实现怎么做呢，我想要随时获取状态。