android - org.chromium.media.AudioManagerAndroid.hasUsbAudioCommInterface（AudioManagerAndroid.java:1224）的 NullPointerException

Question

我的应用程序使用 aWebView来显示一些内容。有一天，我开始从我的用户那里收到以下错误：

Fatal Exception: java.lang.RuntimeException: Error receiving broadcast Intent { act=android.hardware.usb.action.USB_DEVICE_ATTACHED flg=0x10 pkg=com.chessking.android.learn.ctforbeginners } in org.chromium.media.AudioManagerAndroid$5@13883a1
       at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:891)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5420)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDevice.getInterfaceCount()' on a null object reference
       at org.chromium.media.AudioManagerAndroid.hasUsbAudioCommInterface(AudioManagerAndroid.java:1224)
       at org.chromium.media.AudioManagerAndroid.access$1200(AudioManagerAndroid.java:43)
       at org.chromium.media.AudioManagerAndroid$5.onReceive(AudioManagerAndroid.java:1254)
       at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:881)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5420)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我查看了 AudioManagerAndroid.java 代码，错误在行

if (!hasUsbAudioCommInterface(device)) return;

device一片空白：

 .... 
 mUsbAudioReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                if (DEBUG) {
                    logd("UsbDeviceBroadcastReceiver.onReceive: a= " + intent.getAction()
                            + ", Device: " + device.toString());
                }
                // Not a USB audio device.
                if (!hasUsbAudioCommInterface(device)) return;
 ....

如何在不改变铬源的情况下避免该问题？我WebView从不使用音频。有没有办法不订阅音频事件？

标签： androidaudiowebviewchromium