爲什麼getLastKnownLocation（提供者）在clearTestProviderLocation（提供者）後不返回null

Question

我假設getLastKnownLocation在爲同一提供者調用clearTestProviderLocation後爲給定提供者返回null。

爲什麼？因爲文檔說clearTestProviderLocation;

刪除與給定提供者關聯的任何模擬位置。

public void test() throws SecurityException { 
    String provider = "TEST"; 
    Location location = new Location(provider); 
    location.setAccuracy(100); 
    location.setTime(System.currentTimeMillis()); 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { 
     location.setElapsedRealtimeNanos(SystemClock.elapsedRealtimeNanos()); 
    } 

    mLocationManager.addTestProvider(provider, false, false, 
     false, false, false ,false, false, 0, 0); 

    mLocationManager.setTestProviderEnabled(provider, true); 
    mLocationManager.setTestProviderLocation(provider, location); 

    Location locationBefore = mLocationManager.getLastKnownLocation(provider); 
    Log.d(TAG, locationBefore.toString()); 

    mLocationManager.clearTestProviderLocation(provider); 

    Location locationAfter = mLocationManager.getLastKnownLocation(provider); 
    Log.d(TAG, locationAfter.toString()); 
} 

運行測試方法後，locationBefore和locationAfter是一樣的！

和日誌像下面，

Location[TEST 0.000000,0.000000 acc=100 et=+4d10h54m26s455ms mock] 
Location[TEST 0.000000,0.000000 acc=100 et=+4d10h54m26s455ms mock] 

我缺少什麼？

Answer 1

至於The documentation爲getLastKnownLocation說

如果提供的是當前被禁用，則返回null。

您需要先禁用測試提供程序getLastKnownLocation才能返回null。