Question

我有一个按钮，点击它需要从gps获取用户当前位置。

我可以不使用LocationListener吗？因为我需要在点击动作后才能获得位置，而且我不需要一直通过onLocationChanged来吃电池。有可能吗？

我试过，但有错误

public void goToHomePoint(View v){
    LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);  
    Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    Toast.makeText(getApplicationContext(), String.valueOf(location.getLatitude()) + " " + String.valueOf(location.getLongitude()), Toast.LENGTH_SHORT).show();
}

清单中的

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

错误

04-29 12:01:39.696: E/AndroidRuntime(252): Uncaught handler: thread main exiting due to uncaught exception
04-29 12:01:39.716: E/AndroidRuntime(252): java.lang.IllegalStateException: Could not execute method of the activity
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.View$1.onClick(View.java:2031)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.View.performClick(View.java:2364)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.View.onTouchEvent(View.java:4179)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.View.dispatchTouchEvent(View.java:3709)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
04-29 12:01:39.716: E/AndroidRuntime(252):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
04-29 12:01:39.716: E/AndroidRuntime(252):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
04-29 12:01:39.716: E/AndroidRuntime(252):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.os.Looper.loop(Looper.java:123)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.app.ActivityThread.main(ActivityThread.java:4363)
04-29 12:01:39.716: E/AndroidRuntime(252):  at java.lang.reflect.Method.invokeNative(Native Method)
04-29 12:01:39.716: E/AndroidRuntime(252):  at java.lang.reflect.Method.invoke(Method.java:521)
04-29 12:01:39.716: E/AndroidRuntime(252):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
04-29 12:01:39.716: E/AndroidRuntime(252):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
04-29 12:01:39.716: E/AndroidRuntime(252):  at dalvik.system.NativeStart.main(Native Method)
04-29 12:01:39.716: E/AndroidRuntime(252): Caused by: java.lang.reflect.InvocationTargetException
04-29 12:01:39.716: E/AndroidRuntime(252):  at com.artox.relax.inf.MapViewActivity.goToHomePoint(MapViewActivity.java:141)
04-29 12:01:39.716: E/AndroidRuntime(252):  at java.lang.reflect.Method.invokeNative(Native Method)
04-29 12:01:39.716: E/AndroidRuntime(252):  at java.lang.reflect.Method.invoke(Method.java:521)
04-29 12:01:39.716: E/AndroidRuntime(252):  at android.view.View$1.onClick(View.java:2026)
04-29 12:01:39.716: E/AndroidRuntime(252):  ... 19 more
04-29 12:01:39.716: E/AndroidRuntime(252): Caused by: java.lang.NullPointerException

Answer 1

您可以编写LocationListener，但是当您第一次收到位置时，如果准确度是您想要的东西，那么您可以使用removeUpdates从LocationManager中删除相同的侦听器。您甚至可以在等待位置时使用进度对话框，并在有足够位置来移除位置监听器时将其关闭。

Answer 2

我正在尝试的这段代码似乎对我有用，它与你的代码相同，但是getSystemService的参数是Context.LOCATION_SERVICE

LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE );

Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

double lat = location.getLatitude();

double lon = location.getLongitude();

那说它似乎有一个一次性的位置，虽然位置可能是旧的/过时的

android：如何从gps获取位置？

2 个答案: