java.lang.NullPointerException: Attempt to invoke virtual method 'void android.preference.CheckBoxPreference.setChecked(boolean)' on a null object reference

Stack Overflow | khoi | 3 months ago
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  1. 0

    why checkboxpreference is a null object preference

    Stack Overflow | 3 months ago | khoi
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.preference.CheckBoxPreference.setChecked(boolean)' on a null object reference
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    Stack Overflow | 2 months ago | Chirag
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.support.v7.app.ActionBarDrawerToggle.onOptionsItemSelected(android.view.MenuItem)' on a null object reference
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    onOptionsItemSelected unexpectedly closes drawer

    Stack Overflow | 2 years ago
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.support.v7.app.ActionBarDrawerToggle.onOptionsItemSelected(android.view.MenuItem)' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.preference.CheckBoxPreference.setChecked(boolean)' on a null object reference

      at com.example.user.uniselic.MyPreferencesActivity.uncheckAll()
    2. com.example.user
      HomeActivity.onOptionsItemSelected
      1. com.example.user.uniselic.MyPreferencesActivity.uncheckAll(MyPreferencesActivity.java:51)
      2. com.example.user.uniselic.HomeActivity.onOptionsItemSelected(HomeActivity.java:193)
      2 frames
    3. Android Platform
      Activity.onMenuItemSelected
      1. android.app.Activity.onMenuItemSelected(Activity.java:2928)
      1 frame
    4. Android Support v4
      FragmentActivity.onMenuItemSelected
      1. android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:406)
      1 frame
    5. Android v7
      WindowCallbackWrapper.onMenuItemSelected
      1. android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195)
      2. android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:103)
      2 frames