android - 传感器模拟器的 NetworkOnMainThreadException

Question

我按照此说明使用传感器模拟器在模拟器上调试我的应用程序: http://code.google.com/p/openintents/wiki/SensorSimulator#How_to_use_the_in_your_application

我完成了上述所有步骤，但就我而言，一切并不像说明中描述的那么简单。我在尝试连接、注册监听器等时遇到了 NetworkOnMainThreadException。所以我创建了异步任务来解决这个问题。现在，我有以下内容:

连接到模拟器:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    sensorManager = SensorManagerSimulator.getSystemService(this, SENSOR_SERVICE);
        this.new ConnectToSimulator().execute();
    }

onResume() 监听器的注册:

@Override
public void onResume() {
    super.onResume();
    this.new RegisterToSimulator().execute();       
}

最后是我的任务:

class ConnectToSimulator extends AsyncTask<Object, Object, Object> {   
    @Override
    protected Object doInBackground(Object... arg0) {
        try{
        sensorManager.connectSimulator();
        }catch(Exception e)
        {
            Log.i("error", e.getMessage());
        }
        return null;
    }       
}

class RegisterToSimulator extends AsyncTask<Object, Object, Object> {      
    @Override
    protected Object doInBackground(Object... arg0) {
        try{
            sensorManager.registerListener(Compass.this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_FASTEST);
            sensorManager.registerListener(Compass.this, sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD), SensorManager.SENSOR_DELAY_FASTEST);
            sensorManager.registerListener(Compass.this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_FASTEST);
        }catch(Exception e)
        {
            Log.i("error", e.getMessage());
        }
        return null;
    }

}

但即使在那之后，我仍然收到尝试在模拟器上启动应用程序的错误:

12-15 14:23:28.877: E/AndroidRuntime(3724): FATAL EXCEPTION: main 12-15 14:23:28.877: E/AndroidRuntime(3724): android.os.NetworkOnMainThreadException 12-15 14:23:28.877: E/AndroidRuntime(3724): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 12-15 14:23:28.877: E/AndroidRuntime(3724): at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:163) 12-15 14:23:28.877: E/AndroidRuntime(3724): at libcore.io.IoBridge.recvfrom(IoBridge.java:513) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.io.InputStreamReader.read(InputStreamReader.java:244) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.io.BufferedReader.fillBuf(BufferedReader.java:130) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.io.BufferedReader.readLine(BufferedReader.java:354) 12-15 14:23:28.877: E/AndroidRuntime(3724): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient.readSensor(SensorSimulatorClient.java:654) 12-15 14:23:28.877: E/AndroidRuntime(3724): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient.readSensor(SensorSimulatorClient.java:571) 12-15 14:23:28.877: E/AndroidRuntime(3724): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient.access$1000(SensorSimulatorClient.java:53) 12-15 14:23:28.877: E/AndroidRuntime(3724): at org.openintents.sensorsimulator.hardware.SensorSimulatorClient$1.handleMessage(SensorSimulatorClient.java:505) 12-15 14:23:28.877: E/AndroidRuntime(3724): at android.os.Handler.dispatchMessage(Handler.java:99) 12-15 14:23:28.877: E/AndroidRuntime(3724): at android.os.Looper.loop(Looper.java:137) 12-15 14:23:28.877: E/AndroidRuntime(3724): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.lang.reflect.Method.invokeNative(Native Method) 12-15 14:23:28.877: E/AndroidRuntime(3724): at java.lang.reflect.Method.invoke(Method.java:511) 12-15 14:23:28.877: E/AndroidRuntime(3724): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-15 14:23:28.877: E/AndroidRuntime(3724): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-15 14:23:28.877: E/AndroidRuntime(3724): at dalvik.system.NativeStart.main(Native Method)

有人可以澄清为什么我有这么奇怪的错误吗？此外，模拟器指令中没有关于异步任务使用必要性的信息，也许我做错了什么。请帮忙，提前致谢。

Answer 1

不幸的是，这个错误无法绕过，因为库没有实现 "new"SDK 限制。

最简单的解决方案是将 list 中的 minSdkVersion 设置为 Honeycomb 之前的内容 (例如 android:minSdkVersion="8")。

对此的原因是，尽管您确实在后台线程上进行了连接，但您仍然创建了 UI 线程上的对象，这反过来意味着 SensorSimulatorClient 将使用套接字 在您的 UI 线程上进行通信。