EditText中的文本未保存在共享首選項中

-1

我有一個EditText，並且我想將EditText中的文本保存爲共享首選項中的字符串（如果該字符串不爲空或爲空）。但是我的應用程序崩潰與下面的代碼：EditText中的文本未保存在共享首選項中

Activity.java：

Button buttonNext = (Button) findViewById(R.id.buttonNext); 
    assert buttonNext != null; 
    buttonNext.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if (checkForGuardianNames()) { 
       Log.i("Guardian names: ", "check passed"); 
       Log.i("ActivityEditText", inputGuardian1.getText().toString()); 
       Toast toast = Toast.makeText(UserInfoActivity.this, inputGuardian1.getText().toString(), Toast.LENGTH_LONG); 
       toast.show(); 
       saveGuardianNames(); 

       } else { 
        promptToFillField("Guardian"); 
        Log.i("Guardian names: ", "check failed"); 
//     Toast toast = Toast.makeText(UserInfoActivity.this, "Works well part 2 "+ inputGuardian1.getText().toString(), Toast.LENGTH_LONG); 
//     toast.show(); 
       } 
      }

現在我知道checkForGuardianNames()通行證，但在調用saveGuardianNames()方法的應用程序崩潰。

我saveGuardianNames()：

private void saveGuardianNames(){ 
    String guardian1 = inputGuardian1.getText().toString(); 
    String guardian2 = inputGuardian2.getText().toString(); 
    String guardian3 = inputGuardian3.getText().toString(); 
    String guardian4 = inputGuardian4.getText().toString(); 
    Log.i("Value: ", "Dummy"); 
    Log.i("saveGuardianNames", "Called"); 


     if (!inputGuardian1.getText().toString().matches("")){ 
      Log.i("Putting text", "in sp"); 
      sharedPreferences.edit().putString("Guardian 1", guardian1).apply(); 
      Log.i("Putting text", "passed"); 
     } 
}

現在我看到saveGuardianNames: check passed在logcat中這樣的方法是否正確調用，但該行的正上方，是不是（Log.i("Value: ", "Dummy");）並沒有它的任何提及在logcat的。另外，據我所知，在執行Log.i("Putting text", "in sp");之前，if語句不會被調用或崩潰。

我的錯誤的logcat：

08-24 01:40:43.712 1497-1497/com.bluefirelabs.apptiva I/Guardian names:: check passed 
08-24 01:40:43.732 1497-1497/com.bluefirelabs.apptiva I/saveGuardianNames: Called 
08-24 01:40:43.732 1497-1497/com.bluefirelabs.apptiva E/AndroidRuntime: FATAL EXCEPTION: main 
                     Process: com.bluefirelabs.apptiva, PID: 1497 
                     java.lang.NullPointerException: Attempt to invoke interface method 'android.content.SharedPreferences$Editor android.content.SharedPreferences.edit()' on a null object reference 
                      at com.bluefirelabs.apptiva.UserInfoActivity$override.saveGuardianNames(UserInfoActivity.java:374) 
                      at com.bluefirelabs.apptiva.UserInfoActivity$override.static$access$200(UserInfoActivity.java:27) 
                      at com.bluefirelabs.apptiva.UserInfoActivity$override.access$dispatch(UserInfoActivity.java) 
                      at com.bluefirelabs.apptiva.UserInfoActivity.access$200(UserInfoActivity.java:0) 
                      at com.bluefirelabs.apptiva.UserInfoActivity$1$override.onClick(UserInfoActivity.java:112) 
                      at com.bluefirelabs.apptiva.UserInfoActivity$1$override.access$dispatch(UserInfoActivity.java) 
                      at com.bluefirelabs.apptiva.UserInfoActivity$1.onClick(UserInfoActivity.java:0) 
                      at android.view.View.performClick(View.java:5702) 
                      at android.widget.TextView.performClick(TextView.java:10885) 
                      at android.view.View$PerformClick.run(View.java:22533) 
                      at android.os.Handler.handleCallback(Handler.java:739) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:158) 
                      at android.app.ActivityThread.main(ActivityThread.java:7229) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

我有點困惑，爲什麼某些行，同時一個之前，它是不是，爲什麼應用程序被保存到任何共享偏好墜毀前正在執行。任何幫助表示讚賞。

來源

2016-08-24 skbrhmn

作爲日誌'sharedPreferences'爲空 –

你在哪裏創建和初始化'sharedPreferences'，你能否顯示 –

在使用之前初始化sharedPreferences – SANAT

if (!inputGuardian1.getText().toString().matches("")){ 
      Log.i("Putting text", "in sp"); 
      if(sharedPreferences != null){ 
      sharedPreferences.edit().putString("Guardian 1", guardian1).apply(); 
      Log.i("Putting text", "passed"); 
      }else{ 
      sharedPreferences = mContext.getSharedPreferences(PREF_NAME, PRIVATE_MODE); 
      sharedPreferences.edit().putString("Guardian 1", guardian1).apply(); 
      } 
     }

來源

2016-08-24 06:00:16

經過所有編輯之後，您需要調用此函數，編輯器密碼爲 ;

請去這個網站http://www.androidhive.info/2012/08/android-session-management-using-shared-preferences/

來源

2016-08-24 05:48:06 lakshmi

因爲你必須做sharedPreferences這樣的：

SharedPreferences sharedPref = getSharedPreferences(
       getString(R.string.preference_file_key), Context.MODE_PRIVATE); 
SharedPreferences.Editor editor = sharedPref.edit();

然後editor.putString( ...

然後editor.apply()

來源

2016-08-24 05:48:09 ShadowGod

你SharedPreferences對象沒有初始化，所以請初始化它，如

如果您在活動做然後做這樣的

SharedPreferences.Editor editor = getSharedPreferences("YouKeyName", MODE_PRIVATE).edit(); 

editor.putString("Guardian 1", "Hi"); 
editor.commit();

如果你正在做的片段然後做這樣的

SharedPreferences.Editor editor = getActivity().getSharedPreferences("UserInfo", getActivity().MODE_PRIVATE).edit(); 

editor.putString("Guardian 1", "Hi"); 
editor.commit();

來源

2016-08-24 05:48:45

SharedPreferences sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);   
sharedpreferences.edit().putString("key", "value").commit();

來源

2016-08-24 05:52:02

EditText中的文本未保存在共享首選項中

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