我写了一段代码，在用户每次点击按钮时获取设备的当前位置。但是当我调用监听器时，应用程序崩溃了。谁能告诉我我做错了什么？提前致谢。
public void onStartService()
{
addListenerLocation();
}
@SuppressLint("NewApi")
private void addListenerLocation()
{
mLocationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
LocationListener mLocationListener = new LocationListener()
{
public void onLocationChanged(Location location)
{
currentLat = location.getLatitude();
InstanciaObjetos.setPEDLAT(currentLat);
currentLon = location.getLongitude();
InstanciaObjetos.setPEDLON(currentLon);
}
public void onStatusChanged(String provider, int status, Bundle extras)
{
//TODO -- Barney says what should happen
}
public void onProviderEnabled(String provider)
{
Location lastKnownLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(lastKnownLocation!=null)
{
currentLat = lastKnownLocation.getLatitude();
currentLon = lastKnownLocation.getLongitude();
}
}
public void onProviderDisabled(String provider)
{
}
};
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 0, 0, mLocationListener);
}
要启动服务，我只需调用 onStartService()。还有什么我需要做的吗？
我刚刚附加了 logcat。现在我意识到需要做什么(我猜)。
09-21 23:17:41.209 8861-8861/br.com.appvendasfs E/AndroidRuntime: FATAL EXCEPTION: main
Process: br.com.appvendasfs, PID: 8861
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.view.View$DeclaredOnClickListener.onClick(View.java:4452)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
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:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate()
at android.app.Activity.getSystemService(Activity.java:5253)
at appVendasFS.DAO.PedidosDAO.addListenerLocation(PedidosDAO.java:47)
at appVendasFS.DAO.PedidosDAO.onStartService(PedidosDAO.java:40)
at appVendasFS.DAO.PedidosDAO.Inserir(PedidosDAO.java:97)
at appVendasFS.UI.TelaVenda.Inserir_Pedido(TelaVenda.java:813)
at appVendasFS.UI.TelaVenda.onClick_botao(TelaVenda.java:593)
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
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:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
最佳答案
改为在服务的 onCreate() 方法中调用 addListenerLocation();。
关于Android 位置管理器在调用时使应用程序崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39574790/