Заявление об отказе

Question

Я пытаюсь применить Pin Lock в одном из моих приложений. Он обрушивается на Fatal Exception. Мой Основная деятельность класса, как ниже

public class LockActivity extends AppCompatActivity { 
    public static final String TAG = "PinLockView"; 
    private PinLockView mPinLockView; 
    private IndicatorDots mIndicatorDots; 

    private PinLockListener mPinLockListener = new PinLockListener() { 
     @Override 
     public void onComplete(String pin) { 
      Log.d(TAG, "Pin complete: " + pin); 
     } 

     @Override 
     public void onEmpty() { 
      Log.d(TAG, "Pin empty"); 
     } 

     @Override 
     public void onPinChange(int pinLength, String intermediatePin) { 
      Log.d(TAG, "Pin changed, new length " + pinLength + " with intermediate pin " + intermediatePin); 
     } 
    }; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     mPinLockView = (PinLockView) findViewById(R.id.pin_lock_view); 
     mPinLockView.setPinLockListener(mPinLockListener); 
    } 
} 

Его дает ошибку во время выполнения в этой строке

 com.exmaple.myapp.LockActivity.onCreate(LockActivity.java:42) 

Что мне не хватает в этом?

LogCat как ниже

09-20 09:09:56.084: E/AndroidRuntime(28826): FATAL EXCEPTION: main 
09-20 09:09:56.084: E/AndroidRuntime(28826): Process: it.dueelleautomazione.plcmon, PID: 28826 
09-20 09:09:56.084: E/AndroidRuntime(28826): java.lang.RuntimeException: Unable to start activity ComponentInfo{it.dueelleautomazione.plcmon/it.dueelleautomazione.plcmon.LockActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.andrognito.pinlockview.PinLockView.setPinLockListener(com.andrognito.pinlockview.PinLockListener)' on a null object reference 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.ActivityThread.access$1100(ActivityThread.java:229) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.os.Handler.dispatchMessage(Handler.java:102) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.os.Looper.loop(Looper.java:148) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.ActivityThread.main(ActivityThread.java:7325) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at java.lang.reflect.Method.invoke(Native Method) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
09-20 09:09:56.084: E/AndroidRuntime(28826): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.andrognito.pinlockview.PinLockView.setPinLockListener(com.andrognito.pinlockview.PinLockListener)' on a null object reference 
09-20 09:09:56.084: E/AndroidRuntime(28826): at it.dueelleautomazione.plcmon.LockActivity.onCreate(LockActivity.java:42) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.Activity.performCreate(Activity.java:6904) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136) 
09-20 09:09:56.084: E/AndroidRuntime(28826): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266) 
09-20 09:09:56.084: E/AndroidRuntime(28826): ... 9 more 

Благодарности

Answer 1

Я думаю, что вы пропустите этот

setContentView(R.layout.YOUR_XML_LAYOUT_FOR_LOCKACTIVITY); 

после super.onCreate(savedInstanceState);