java - Android:无法在未调用 Looper.prepare() 的线程内创建处理程序

Question

我尝试运行以下命令，但收到错误

Can't create handler inside thread that has not called Looper.prepare()

这是我的代码

private static void getLocations()
{   
    try
    {       
        m_locationManager = (LocationManager)activity.getSystemService(Context.LOCATION_SERVICE);           
        m_locationListener = new LocationListener() {
            public void onLocationChanged(Location location) 
            {
                Log.d("Output", "onLocationChanged");
            }

            public void onStatusChanged(String provider, int status, Bundle extras) 
            {
                Log.d("Output", "onStatusChanged");
            }

            public void onProviderEnabled(String provider) 
            {
                Log.d("Output", "onProviderEnabled");
            }

            public void onProviderDisabled(String provider) 
            {
                Log.d("Output", "onProviderDisabled");
            }
        };

        m_locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 1000, m_locationListener);
        Log.d("Output", "done");

    }
    catch(Exception ex)
    {
        Log.d("Output", ex.getMessage());
    }

}

如果我将 Looper.prepare() 放在 requestLocationUpdates() 之前，错误就会消失，但不会触发任何事件。

如果我将 Looper.loop() 放在 requestLocationUpdates() 之后，它将暂停并且不会调用“完成”日志。

如果在 runOnUiThread 中调用该函数，如下所示:

activity.runOnUiThread(new Runnable() {
    public void run() 
    {
        getLocations(); 
    }
});

没有事件被触发。

我将其作为 Unity 游戏引擎的插件运行，因此我无法直接访问主线程。

我尝试在 Untiy 之外运行此代码，并且运行良好。

我对这个问题非常困惑，因此我们将不胜感激。

干杯

<小时/>

更新:

所以我现在尝试检索单独 Activity 中的位置。但是，事件仍未被调用。

public class LocationActivity extends Activity implements LocationListener
{
    private LocationManager m_locationManager;

    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);

        LinearLayout content = new LinearLayout(this);
        content.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        content.setOrientation(LinearLayout.VERTICAL);
        content.setBackgroundColor(Color.TRANSPARENT);

        TextView infoLabel = new TextView(this);
        infoLabel.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
        infoLabel.setTextSize(20.0f);
        infoLabel.setText("Initializing...");
        content.addView(infoLabel);

        try
        {
            m_locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

            String provider = null;

            if (m_locationManager.isProviderEnabled( LocationManager.GPS_PROVIDER)) 
            {
                provider = LocationManager.GPS_PROVIDER ;
                Log.d("Unity", "Using GPS");
                m_locationManager.requestLocationUpdates(provider, 1000, 100, this);
            } 
            else if(m_locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) 
            {
                provider = LocationManager.NETWORK_PROVIDER;
                Log.d("Unity", "Using Netword");
                m_locationManager.requestLocationUpdates(provider, 1000, 100, this);
            } 
            else 
            {
                Log.d("Unity", "Provider Not available");
            }       
        }
        catch(Exception ex)
        {
            Log.d("Unity", "locatons error " + ex.getMessage());
        }

        setContentView(content);
    }

    public void onLocationChanged(Location location) 
    {
        Log.d("Unity", "UserLocation Lat:" + location.getLatitude() + " Long:" + location.getLongitude());
    }

    public void onStatusChanged(String provider, int status, Bundle extras) 
    {
        Log.d("Unity", "onStatusChanged");
    }

    public void onProviderEnabled(String provider) 
    {
        Log.d("Unity", "onProviderEnabled");
    }

    public void onProviderDisabled(String provider) 
    {
        Log.d("Unity", "onProviderDisabled");
    }
} 

View 已正确打开，并且 GPS 和网络均可用。仍然没有触发事件

我正在使用这些权限

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_GPS" /> 
<uses-permission android:name="android.permission.READ_PHONE_STATE"/> 
<uses-permission android:name="android.permission.INTERNET"/> 

Answer 1

尝试 mView.post(new Runnable() { getLocations() };