MainActivity.java

================================

public class MainActivity extends TabActivity {

...

tabHost.addTab(tabHost.newTabSpec("tab1") .setIndicator("tab 1") .setContent(new Intent(this, List1.class)));

tabHost.addTab(tabHost.newTabSpec("tab2") .setIndicator("tab 2") .setContent(new Intent(this, List2.class)));

tabHost.addTab(tabHost.newTabSpec("tab3") .setIndicator("tab 3") .setContent(new Intent(this, List3.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)));

..

}

List1.java

=====================================================

public class List1 extends Activity {

...

SharedPreferences pref;

Boolean chk_1 = pref.getBoolean("s_1", false);

Boolean chk_2 = pref.getBoolean("s_2", false);

Boolean chk_3 = pref.getBoolean("s_3", false);

Boolean chk_4 = pref.getBoolean("s_4", false);

Boolean chk_5 = pref.getBoolean("s_5", false);

...

}

===========================================================

log.txt

=====================================================

11-26 07:03:26.183: E/AndroidRuntime(5064): FATAL EXCEPTION: main

11-26 07:03:26.183: E/AndroidRuntime(5064): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.MainActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.List1}: java.lang.NullPointerException

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1960)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1985)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.access$600(ActivityThread.java:127)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1151)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.os.Handler.dispatchMessage(Handler.java:99)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.os.Looper.loop(Looper.java:137)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.main(ActivityThread.java:4482)

11-26 07:03:26.183: E/AndroidRuntime(5064): at java.lang.reflect.Method.invokeNative(Native Method)

11-26 07:03:26.183: E/AndroidRuntime(5064): at java.lang.reflect.Method.invoke(Method.java:511)

11-26 07:03:26.183: E/AndroidRuntime(5064): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:788)

11-26 07:03:26.183: E/AndroidRuntime(5064): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)

11-26 07:03:26.183: E/AndroidRuntime(5064): at dalvik.system.NativeStart.main(Native Method)

11-26 07:03:26.183: E/AndroidRuntime(5064): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.List1}: java.lang.NullPointerException

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1960)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.startActivityNow(ActivityThread.java:1801)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:682)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.widget.TabHost.setCurrentTab(TabHost.java:346)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.widget.TabHost.addTab(TabHost.java:236)

11-26 07:03:26.183: E/AndroidRuntime(5064): at com.example.test.MainActivity.onCreate(MainActivity.java:29)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.Activity.performCreate(Activity.java:4701)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1051)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1924)

11-26 07:03:26.183: E/AndroidRuntime(5064): ... 11 more

11-26 07:03:26.183: E/AndroidRuntime(5064): Caused by: java.lang.NullPointerException

11-26 07:03:26.183: E/AndroidRuntime(5064): at com.example.test.List1.onCreate(List1.java:46)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.Activity.performCreate(Activity.java:4701)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1051)

11-26 07:03:26.183: E/AndroidRuntime(5064): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1924)

11-26 07:03:26.183: E/AndroidRuntime(5064): ... 21 more

원래 탭엑티비티로 바꾸기 전에

그냥 메인 버튼 세개 만들어서 각각 버튼 눌렀을때 List1, 2, 3 액티비티로 넘어가는 거였습니다.

그런데 메인을 탭엑티비티로 바꾸면서

SharedPreferences만 쓰면 위와같이 에러가 납니다..

하나하나 주석걸어가면서 실행시켜보니까 SharedPreferences에서 걸리네요 ㅠㅠ

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