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POCannot rename file in Shared Preferences
 

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    <p>I just want to restore the saved preferences, but an error occurs.</p> <p>Login Class:</p> <pre><code>SharedPreferences.Editor editor = settings.edit(); editor.putString("session_id", session); editor.commit(); </code></pre> <p>List Class:</p> <pre><code>editor.putInt("channel_id", map.get(lv2.getItemAtPosition(arg2).toString())); editor.commit(); </code></pre> <p>Main Class:</p> <pre><code>public class MainScreen extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); TextView tv = (TextView) findViewById(R.id.mainscreen); final SharedPreferences settings = getSharedPreferences("pref", 0); String tmp= settings.getString("session_id", "Error") + "ID: " +String.valueOf(settings.getInt("channel_id", -1)); tv.setText(tmp); setContentView(R.layout.mainscreen); } } </code></pre> <p>LogCat:</p> <pre><code>02-01 21:06:56.621: ERROR/ApplicationContext(25035): Couldn't rename file /dbdata/databases/android.skiptvad/shared_prefs/pref.xml to backup file /dbdata/databases/android.skiptvad/shared_prefs/pref.xml.bak 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): FATAL EXCEPTION: main 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): java.lang.RuntimeException: Unable to start activity ComponentInfo{android.skiptvad/android.skiptvad.MainScreen}: java.lang.NullPointerException 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at android.os.Handler.dispatchMessage(Handler.java:99) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at android.os.Looper.loop(Looper.java:123) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at android.app.ActivityThread.main(ActivityThread.java:4627) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at java.lang.reflect.Method.invokeNative(Native Method) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at java.lang.reflect.Method.invoke(Method.java:521) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): at dalvik.system.NativeStart.main(Native Method) 02-01 21:06:56.727: ERROR/AndroidRuntime(25035): Caused by: java.lang.NullPointerException </code></pre>
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    1. USuser547995
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    2. VO
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    1. COAre you sure that exception occurs on the line of code that you posted?
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      1. USFalmarri
    2. COyes i think so... i posted the full class
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      1. USuser547995
 

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