獲取NullPointerException但不能看到一個，任何人都可以指出它

-1

它與Interstitial有關，我遇到了與Adview相同的問題，但通過將Adview添加到xml並在java中引用來解決它，但是不能做到這一點與間質性獲取NullPointerException但不能看到一個，任何人都可以指出它

public class MainActivity extends Activity { 
    AdView adView; 
    InterstitialAd interstitial; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.test); 
     LinearLayout layout = (LinearLayout) findViewById(R.id.test); 
     AdView adView = (AdView) this.findViewById(R.id.adView); 

     AdRequest adRequest = new AdRequest.Builder() 
       .addTestDevice(AdRequest.DEVICE_ID_EMULATOR) 
       .addTestDevice("TEST_DEVICE_ID").build(); 
     adView.loadAd(adRequest); 

     InterstitialAd interstitial = new InterstitialAd(this); 
     interstitial.setAdUnitId("banner"); 
     AdRequest adRequest2 = new AdRequest.Builder() 
       .addTestDevice(AdRequest.DEVICE_ID_EMULATOR) 
       .addTestDevice("TEST_DEVICE_ID").build(); 
     interstitial.loadAd(adRequest2); 
     displayInterstitial(); 

    } 

    public void displayInterstitial() { 
     if (interstitial.isLoaded()) { 
      interstitial.show(); 
     } 
    } 
}

的logcat：

02-21 19:48:29.390: E/AndroidRuntime(1929): FATAL EXCEPTION: main 
02-21 19:48:29.390: E/AndroidRuntime(1929): Process: com.adtest, PID: 1929 
02-21 19:48:29.390: E/AndroidRuntime(1929): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.adtest/com.adtest.MainActivity}: java.lang.NullPointerException 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.os.Handler.dispatchMessage(Handler.java:102) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.os.Looper.loop(Looper.java:136) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at java.lang.reflect.Method.invoke(Method.java:515) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at dalvik.system.NativeStart.main(Native Method) 
02-21 19:48:29.390: E/AndroidRuntime(1929): Caused by: java.lang.NullPointerException 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at com.adtest.MainActivity.displayInterstitial(MainActivity.java:40) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at com.adtest.MainActivity.onCreate(MainActivity.java:35) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.Activity.performCreate(Activity.java:5231) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
02-21 19:48:29.390: E/AndroidRuntime(1929):  ... 11 more 
02-21 19:49:29.530: W/Ads(1929): Timed out waiting for ad response. 
02-21 19:49:29.530: W/Ads(1929): Timed out waiting for ad response. 
02-21 19:53:29.880: I/Process(1929): Sending signal. PID: 1929 SIG: 9

來源

2014-02-22 user3147185

我不知道android，但我建議你提到引發NPE的行。 – Steam

你可以得到幫助的唯一方法是包含logcat。 –

02-21 19：48：29.390：E/AndroidRuntime（1929）：引起：java.lang.NullPointerException – user3147185

您已經在onCreate()創建當地變量和分配InterstitialAd實例吧：

InterstitialAd interstitial = new InterstitialAd(this);

這有什麼，當你調用displayInterstitial()並引用做的領域類，從而你的班級中的字段...這是null

另外值得注意的是，你正在用AdView做同樣的事情。

來源

2014-02-22 01:22:30

InterstitialAd interstitial = new InterstitialAd(this);

你是不是寫你的新實例類的成員，但你要創建一個局部變量來代替。在開始時刪除InterstitialAd，你應該沒問題。

來源

2014-02-22 01:22:24

獲取NullPointerException但不能看到一個，任何人都可以指出它

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