NullPointerException - edittext.gettext()

Я хочу получить значение «EditText et», вызвав методы getText() toString() ... Но мое приложение вылетает из-за исключения NullPointerException.NullPointerException - edittext.gettext()

Вероятно, это потому, что я получаю макет «activity_add_question_popup.xml как PopupWindow без создания нового вида деятельности К сожалению, я новичок в Android Studio Может кто-нибудь сказать мне, что случилось

Logcat:..?

java.lang.IllegalStateException: Could not execute method of the activity 
     at android.view.View$1.onClick(View.java:4007) 
     at android.view.View.performClick(View.java:4756) 
     at android.view.View$PerformClick.run(View.java:19749) 
     at android.os.Handler.handleCallback(Handler.java:739) 
     at android.os.Handler.dispatchMessage(Handler.java:95) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5221) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
Caused by: java.lang.reflect.InvocationTargetException 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at android.view.View$1.onClick(View.java:4002) 
     at android.view.View.performClick(View.java:4756) 
     at android.view.View$PerformClick.run(View.java:19749) 
     at android.os.Handler.handleCallback(Handler.java:739) 
     at android.os.Handler.dispatchMessage(Handler.java:95) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5221) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference 
     at com.brandsplorer.neverever20.Settings.saveNewQuestion(Settings.java:203) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at android.view.View$1.onClick(View.java:4002) 
     at android.view.View.performClick(View.java:4756) 
     at android.view.View$PerformClick.run(View.java:19749) 
     at android.os.Handler.handleCallback(Handler.java:739) 
     at android.os.Handler.dispatchMessage(Handler.java:95) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5221) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

расположение:

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceSmall" 
     android:text="@string/game_title" 
     android:id="@+id/addQuestion_title" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:textSize="20sp" 
     android:layout_gravity="left|center_horizontal" 
     android:layout_marginLeft="30sp" /> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/et" 
     android:layout_below="@+id/game_title_activity" 
     android:layout_centerHorizontal="true" 
     android:layout_gravity="center_horizontal|top" 
     android:layout_alignTop="@+id/addQuestion_title" 
     android:gravity="left|center_vertical" 
     android:layout_marginTop="40sp" 
     android:hint="Gib deine Frage ein..." 
     android:ems="10" /> 

    <FrameLayout 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:layout_marginTop="50sp"> 

     <Button 
      style="?android:attr/buttonStyleSmall" 
      android:layout_width="110dp" 
      android:layout_height="wrap_content" 
      android:text="Speichern" 
      android:id="@+id/addQuestionSaveBtn" 
      android:layout_alignTop="@+id/newQuestionEdit" 
      android:layout_alignParentBottom="true" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_gravity="bottom|right" 
      android:onClick="saveNewQuestion" /> 

     <Button 
      style="?android:attr/buttonStyleSmall" 
      android:layout_width="110sp" 
      android:layout_height="wrap_content" 
      android:text="Zurück" 
      android:id="@+id/addQuestionBackBtn" 
      android:layout_alignTop="@+id/newQuestionEdit" 
      android:layout_alignParentRight="true" 
      android:layout_alignParentEnd="true" 
      android:layout_gravity="left|bottom" 
      android:onClick="closePopup" /> 
    </FrameLayout> 

    </LinearLayout> 

</FrameLayout>

класс: Settings.java

package com.brandsplorer.neverever20;

public class Settings extends ActionBarActivity { 

Button settingsBack, addQuestion; 
CheckBox chkBox_sex, chkBox_day, chkBox_job, chkBox_alcohol, chkBox_own; 
TextView settingsTitle, category; 

EditText editText; 

LayoutInflater layoutInflater; 
View popupView; 
PopupWindow popupWindow; 
//KEYS 
public static final String MyPREFERENCES = "MyPrefs"; 
public static final String sex = "sexBox"; 
public static final String day = "dayBox"; 
public static final String alc = "alcBox"; 
public static final String job = "jobBox"; 
public static final String own = "ownBox"; 

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

    settingsBack = (Button)findViewById(R.id.settingsBackBtn); 
    addQuestion = (Button)findViewById(R.id.addQuestionBtn); 

    chkBox_alcohol = (CheckBox)findViewById(R.id.alcBox); 
    chkBox_day = (CheckBox)findViewById(R.id.dayBox); 
    chkBox_sex = (CheckBox)findViewById(R.id.sexBox); 
    chkBox_job = (CheckBox)findViewById(R.id.jobBox); 
    chkBox_own = (CheckBox)findViewById(R.id.ownBox); 

    settingsTitle = (TextView)findViewById(R.id.settings_title); 
    category = (TextView)findViewById(R.id.kategorien); 

    //initializing editText 
    editText = (EditText)findViewById(R.id.et); 

    loadSavedPreferences(); 
} 

public void backToMain(View view){ 
    if(chkBox_job.isChecked()==false && chkBox_sex.isChecked()==false && chkBox_day.isChecked()==false && chkBox_alcohol.isChecked()==false && chkBox_own.isChecked()==false){ 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setCancelable(false); 
     builder.setMessage("Mindestens eine Kategorie muss ausgewählt sein"); 
     builder.setNegativeButton("OK",new DialogInterface.OnClickListener()  { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 

       dialog.cancel(); 
      } 
     }); 
     AlertDialog alert=builder.create(); 
     alert.show(); 
    } 
    else { 
     savePreferences(); 
     loadSavedPreferences(); 
     finish(); 
    } 
} 

/* 
Here I am getting the Popup. 
A button in my activity_settings.xml runs this method over an onClick attribute. 
*/ 
public void addQuestion(View view){ 
    layoutInflater = (LayoutInflater)getBaseContext().getSystemService(LAYOUT_INFLATER_SERVICE); 
    popupView = layoutInflater.inflate(R.layout.activity_add_question_popup, null); 
    popupWindow = new PopupWindow(popupView, ActionBar.LayoutParams.WRAP_CONTENT, ActionBar.LayoutParams.WRAP_CONTENT); 
    popupWindow.showAtLocation(addQuestion, Gravity.CENTER, 0, 0); 

} 
public void closePopup(View view){ 
    popupWindow.dismiss(); 
} 


@Override 
public void onBackPressed() { 

    if(chkBox_job.isChecked()==false && chkBox_sex.isChecked()==false && chkBox_day.isChecked()==false && chkBox_alcohol.isChecked()==false && chkBox_own.isChecked()==false){ 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setCancelable(false); 
     builder.setMessage("Mindestens eine Kategorie muss ausgewählt sein"); 
     builder.setNegativeButton("OK",new DialogInterface.OnClickListener()  { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       dialog.cancel(); 
      } 
     }); 
     AlertDialog alert=builder.create(); 
     alert.show(); 
    } 
    else { 
     savePreferences(); 
     loadSavedPreferences(); 
     finish(); 
    } 

} 

public void loadSavedPreferences(){ 
    SharedPreferences sharedPreferences = getSharedPreferences("CheckboxData", Context.MODE_PRIVATE); 

    boolean checkedSex = sharedPreferences.getBoolean(sex, true); 
    if(checkedSex){ 
     chkBox_sex.setChecked(true); 
    } 
    else{ 
     chkBox_sex.setChecked(false); 
    } 

    boolean checkedAlc = sharedPreferences.getBoolean(alc, true); 
    if(checkedAlc){ 
     chkBox_alcohol.setChecked(true); 
    } 
    else{ 
     chkBox_alcohol.setChecked(false); 
    } 
    boolean checkedDay = sharedPreferences.getBoolean(day, true); 
    if(checkedDay){ 
     chkBox_day.setChecked(true); 
    } 
    else{ 
     chkBox_day.setChecked(false); 
    } 
    boolean checkedJob = sharedPreferences.getBoolean(job, true); 
    if(checkedJob){ 
     chkBox_job.setChecked(true); 
    } 
    else{ 
     chkBox_job.setChecked(false); 
    } 
    boolean checkedOwn = sharedPreferences.getBoolean(own, false); 
    if(checkedOwn){ 
     chkBox_own.setChecked(true); 
    } 
    else{ 
     chkBox_own.setChecked(false); 
    } 


} 

public void savePreferences(){ 
    SharedPreferences sharedPreferences = getSharedPreferences("CheckboxData", Context.MODE_PRIVATE); 
    Editor editor = sharedPreferences.edit(); 
    editor.putBoolean(sex, chkBox_sex.isChecked()); 
    editor.putBoolean(alc, chkBox_alcohol.isChecked()); 
    editor.putBoolean(job, chkBox_job.isChecked()); 
    editor.putBoolean(day, chkBox_day.isChecked()); 
    editor.putBoolean(own, chkBox_own.isChecked()); 
    editor.commit(); 
} 

public void saveNewQuestion(View view){ 
    //because of this editText.getText() I get an error. 
    //editText is null for some reason... 
    String question = editText.getText().toString(); 
    String file_name = "sentences_own"; 
    if(question.isEmpty()){ 
     Toast.makeText(getApplicationContext(), "Frage darf nicht leer sein!", Toast.LENGTH_LONG).show(); 
    } 
    else { 
     try { 
      FileOutputStream fileOutputStream = openFileOutput(file_name, MODE_APPEND); 
      fileOutputStream.write(question.getBytes()); 
      fileOutputStream.close(); 
      Toast.makeText(getApplicationContext(), "Frage gespeichert!", Toast.LENGTH_LONG).show(); 
     } 
     catch (FileNotFoundException e) { 
      e.printStackTrace(); 
     } 
     catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 
} 


}

источник

2015-07-25 DBO

Вы получаете NullPointerException потому EditText определяется не внутри function, в котором вы вызываете его. Переместите editText = (EditText)findViewById(R.id.et); внутри вашей функции saveNewQuestion.

источник

2015-07-25 22:06:13

спасибо. Я попробую это сегодня вечером. – DBO

Создание editText static также будет работать, потому что таким образом он будет принадлежать всему классу, а не экземпляру класса. – OlaB

NullPointerException - edittext.gettext()

ответ

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