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POSimple SharedPreferences in Android
 

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  1. POSimple SharedPreferences in Android
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    <p>I'm having a problem, and I already tried everything I found on this site, it's not helping, so I'm asking this question myself.</p> <p>my code is:</p> <pre><code>public class MyActivity extends Activity{ protected PositionSense positionSense; protected Preferences preferences; String IP; String ID; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); positionSense = new PositionSense(this, null); SharedPreferences settings = getSharedPreferences("preferences", 0); IP = settings.getString("ip", "http://192.168.1.3:8080/servlet"); ID = settings.getString("id", "USER"); } </code></pre> <p>Later on, I use these variables in a background running thread that contacts the servlet and sends some info (including position and ID of the user which is saved in preferences)</p> <p>I'm not posting all of that because I don't want to clog up the thread more than necessary (but if it is needed, I will post it all)</p> <p>In any case, it doesn't work and it gives me the following error log:</p> <pre><code>09-14 16:47:20.854: WARN/dalvikvm(552): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 09-14 16:47:20.884: ERROR/AndroidRuntime(552): FATAL EXCEPTION: main java.lang.IllegalStateException: Could not execute method of the activity at android.view.View$1.onClick(View.java:3044) at android.view.View.performClick(View.java:3511) at android.view.View$PerformClick.run(View.java:14105) at android.os.Handler.handleCallback(Handler.java:605) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4424) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at android.view.View$1.onClick(View.java:3039) ... 11 more Caused by: java.lang.NullPointerException at com.moodswings.MoodSwingsActivity.clickHappy(MoodSwingsActivity.java:94) ... 14 more </code></pre> <p>I don't know what to do about it.</p> <p>Can someone give me the SIMPLEST possible way to save 2 strings in preferences in one activity that are used in some other activity within the same application? It's supposed to be really simple, but I simply cannot make it work, and I'm nearing my deadline. Thanks!</p>
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    1. USuser1549053
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    1. COWhat is `MoodSwingsActivity.java` line 94?
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    2. COWhen you do write sharedpreferences by using SharedPreferences.Editor, make sure you call editor.commit() after the writing is done. I had missed that and was having similar problems
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      1. USchaitanya
    3. COThe error does not seem due to SharedPreferences at all. Stack trace is telling some other story than your question. Please cross check your question.
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      1. USvikas
 

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