地理編碼器初始化失敗

試圖申報地理編碼在我的應用程序時，我得到一個NullPointerException。我有以下聲明：地理編碼器初始化失敗

public class MainActivity extends Activity { 

private Geocoder geocoder = new Geocoder(this, Locale.getDefault()); 

    ... 
}

我得到如下的logcat：

03-20 10:48:55.729: D/AndroidRuntime(604): Shutting down VM 
03-20 10:48:55.729: W/dalvikvm(604): threadid=1: thread exiting with uncaught exception 

(group=0x40a71930) 
03-20 10:48:56.209: E/AndroidRuntime(604): FATAL EXCEPTION: main 
03-20 10:48:56.209: E/AndroidRuntime(604): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.coord/com.example.coord.MainActivity}: java.lang.NullPointerException 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.access$600(ActivityThread.java:141) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.os.Looper.loop(Looper.java:137) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.main(ActivityThread.java:5041) 
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.reflect.Method.invokeNative(Native Method) 
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.reflect.Method.invoke(Method.java:511) 
03-20 10:48:56.209: E/AndroidRuntime(604): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
03-20 10:48:56.209: E/AndroidRuntime(604): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
03-20 10:48:56.209: E/AndroidRuntime(604): at dalvik.system.NativeStart.main(Native Method) 
03-20 10:48:56.209: E/AndroidRuntime(604): Caused by: java.lang.NullPointerException 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:109) 
03-20 10:48:56.209: E/AndroidRuntime(604): at com.example.coord.MainActivity.<init>(MainActivity.java:21) 
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.Class.newInstanceImpl(Native Method) 
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.Class.newInstance(Class.java:1319) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.Instrumentation.newActivity(Instrumentation.java:1054) 
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)

線21是我的地理編碼聲明。我的代碼有什麼問題？

來源

2013-03-20 Mihai Andrei Rustiuc

只需在GeoCoder構造函數中設置'getApplicationContext（）'或'MainActivity.this'而不是'this'即可。然後嘗試 – GrIsHu 2013-03-20 11:05:27

這篇可是不行的，可悲的是... – 2013-03-20 11:17:25

當活動開始，所以你不能初始化類體的地理編碼器的情況下才可用。嘗試初始化它在OnCreate或替代的onResume方法...

public class MainActivity extends Activity { 
    private Geocoder mGeocoder; 

    @Override 
    protected void onCreate(Bundle _icicle) { 
    super.onCreate(_icicle); 
    mGeocoder = new Geocoder(getApplicationContext(), Locale.getDefault()); 
    } 
}

來源

2013-03-20 11:48:35 usb79

謝謝你的建議。現在它可以工作。 – 2013-03-20 12:18:15

不客氣=） – usb79 2013-03-20 12:19:50

請問上面AppCompactActivity代碼工作？ – 2017-05-18 07:01:11

添加此權限體現

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

，並使用getApplicationContext(）insted的的this

來源

2013-03-20 11:04:00 XEENA

它仍然沒有工作... – 2013-03-20 11:18:04

建議使用地理編碼的背景或在單獨的線程通過谷歌開發者頁面定義。

new Thread(new Runnable() 
        { 
         @Override 
         public void run() 
         { 
          //Do things. 
          Geocoder geocoder = new Geocoder(getBaseContext()); 


          try { 
           // Getting a maximum of 5 Address that matches the input text 
           addresses = geocoder.getFromLocationName(addressText,5); 


          } catch (IOException e) { 
           e.printStackTrace(); 
          } 

         } 

        }).start();

來源

2014-09-30 09:27:34 ArhatBaid

地理編碼器初始化失敗

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