android - 当条件设置为高精度时应用程序崩溃

Question

我正在努力获得尽可能高的定位精度，这是我从 GPS 提供商那里了解到的。我只需要获取一次位置，所以我不关心对电池生命周期的影响。在我的功能代码中，位置似乎在完全不准确(1+km)到非常准确(10m 以内)之间交替。在我的应用程序的整个测试过程中，我在手机上启用/禁用位置、打开/关闭 wifi、打开/关闭数据。这只是为了实验，看看每个因素如何影响准确性和应用程序。

以下代码是我在位置 Activity 中的 onCreate 方法:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.map_layout);

    mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map_fragment))
            .getMap();
    mMap.setMyLocationEnabled(true);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    Criteria criteria = new Criteria();

    //criteria.setAccuracy(Criteria.ACCURACY_HIGH);

    provider = locationManager.getBestProvider(criteria, true);

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();

    // Create the LocationRequest object
    mLocationRequest = LocationRequest.create()
            .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
            .setInterval(2 * 1000)        // 10 seconds, in milliseconds
            .setFastestInterval(1 * 1000); // 1 second, in milliseconds
}

但是，当我添加 criteria.setAccuracy(Criteria.ACCURACY_HIGH); 行时，我的应用程序崩溃了。

这是怎么回事？

编辑:这是 logcat 错误:

E/AndroidRuntime: FATAL EXCEPTION: main    
E/AndroidRuntime: Process: com.locationget, PID: 16663    
E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.locationget/com.locationget.MapActivity}: java.lang.IllegalArgumentException: accuracy=3    
E/AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2212)    
E/AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2271    
E/AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:144)    
E/AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)    
E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102)    
E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:136)    
E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5146)    
E/AndroidRuntime:     at java.lang.reflect.Method.invokeNative(Native Method)    
E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:515)    
E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)     
E/AndroidRuntime:     at dalvik.system.NativeStart.main(Native Method)    
E/AndroidRuntime:  Caused by: java.lang.IllegalArgumentException: accuracy=3    
E/AndroidRuntime:     at android.location.Criteria.setAccuracy(Criteria.java:223)    
E/AndroidRuntime:     at com.getlocation.MapActivity.onCreate(MapActivity.java:47)    
E/AndroidRuntime:     at android.app.Activity.performCreate(Activity.java:5231)    
E/AndroidRuntime:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)    
E/AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)    
E/AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2271    
E/AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:144)     
E/AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)        
E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102)        
E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:136)        
E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5146)        
E/AndroidRuntime:     at java.lang.reflect.Method.invokeNative(Native Method)     
E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:515)     
E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)       
E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)     
E/AndroidRuntime:     at dalvik.system.NativeStart.main(Native Method) 

我是 android 的新手，不太确定相关部分是什么。

Answer 1

这一行才是真正的错误:

E/AndroidRuntime: java.lang.RuntimeException: 无法启动 Activity ComponentInfo{com.locationget/com.locationget.MapActivity}:java.lang.IllegalArgumentException: accuracy=3

这是我经过一番搜索后发现的:

The android Criteria has two separate groups of accuracy constants. ACCURACY_FINE and ACCURACY_COARSE are for general location, while ACCURACY_LOW, ACCURACY_MEDIUM, and ACCURACY_HIGH "may be used for horizontal, altitude, speed or bearing accuracy."

所以在你的情况下，不要使用 ACCURACY_HIGH 否则你会得到一个错误。请改用 ACCURACY_COARSE 或 ACCURACY_FINE。