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My Edited Code: Pls Check it out..

 package spinner.onitemsel; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class SpinOnItemActivity extends Activity { ArrayAdapter<CharSequence> adapter; Spinner sp; TextView tview1; int length; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_spin_on_item ); sp= (Spinner) findViewById(R.id.spin); adapter = ArrayAdapter.createFromResource(this, R.array.spinner_array , android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); sp.setAdapter(adapter); sp.performClick(); } public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { String Name = (String) sp.getSelectedItem(); tview1 = (TextView)findViewById(R.id.testtxt ); tview1.setText(Name); } } 

12-10 09:58:40.988: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.168: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.198: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.878: D/dalvikvm(837): GC_CONCURRENT freed 51K, 6% free 2830K/2996K, paused 12ms+3ms, total 56ms 12-10 09:58:41.878: D/dalvikvm(837): WAIT_FOR_CONCURRENT_GC blocked 25ms 12-10 09:58:41.968: D/AndroidRuntime(837): Shutting down VM 12-10 09:58:41.968: W/dalvikvm(837): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 12-10 09:58:41.988: E/AndroidRuntime(837): FATAL EXCEPTION: main 12-10 09:58:41.988: E/AndroidRuntime(837): java.lang.RuntimeException: Unable to start activity ComponentInfo{spinner.onitemsel/spinner.onitemsel.SpinOnItemActivity}: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.access$600(ActivityThread.java:141) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.os.Handler.dispatchMessage(Handler.java:99) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.os.Looper.loop(Looper.java:137) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-10 09:58:41.988: E/AndroidRuntime(837): at java.lang.reflect.Method.invokeNative(Native Method) 12-10 09:58:41.988: E/AndroidRuntime(837): at java.lang.reflect.Method.invoke(Method.java:511) 12-10 09:58:41.988: E/AndroidRuntime(837): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-10 09:58:41.988: E/AndroidRuntime(837): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-10 09:58:41.988: E/AndroidRuntime(837): at dalvik.system.NativeStart.main(Native Method) 12-10 09:58:41.988: E/AndroidRuntime(837): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.ViewRootImpl.setView(ViewRootImpl.java:567) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:246) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.PopupWindow.invokePopup(PopupWindow.java:993) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:899) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.ListPopupWindow.show(ListPopupWindow.java:603) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.Spinner$DropdownPopup.show(Spinner.java:981) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.Spinner.performClick(Spinner.java:609) 12-10 09:58:41.988: E/AndroidRuntime(837): at spinner.onitemsel.SpinOnItemActivity.onCreate(SpinOnItemActivity.java:35) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.Activity.performCreate(Activity.java:5104) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 12-10 09:58:41.988: E/AndroidRuntime(837): ... 11 more 12-10 10:03:42.109: I/Process(837): Sending signal. PID: 837 SIG: 9

12-10 09:58:40.988: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.168: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.198: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.878: D/dalvikvm(837): GC_CONCURRENT freed 51K, 6% free 2830K/2996K, paused 12ms+3ms, total 56ms 12-10 09:58:41.878: D/dalvikvm(837): WAIT_FOR_CONCURRENT_GC blocked 25ms 12-10 09:58:41.968: D/AndroidRuntime(837): Shutting down VM 12-10 09:58:41.968: W/dalvikvm(837): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 12-10 09:58:41.988: E/AndroidRuntime(837): FATAL EXCEPTION: main 12-10 09:58:41.988: E/AndroidRuntime(837): java.lang.RuntimeException: Unable to start activity ComponentInfo{spinner.onitemsel/spinner.onitemsel.SpinOnItemActivity}: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.access$600(ActivityThread.java:141) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.os.Handler.dispatchMessage(Handler.java:99) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.os.Looper.loop(Looper.java:137) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-10 09:58:41.988: E/AndroidRuntime(837): at java.lang.reflect.Method.invokeNative(Native Method) 12-10 09:58:41.988: E/AndroidRuntime(837): at java.lang.reflect.Method.invoke(Method.java:511) 12-10 09:58:41.988: E/AndroidRuntime(837): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-10 09:58:41.988: E/AndroidRuntime(837): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-10 09:58:41.988: E/AndroidRuntime(837): at dalvik.system.NativeStart.main(Native Method) 12-10 09:58:41.988: E/AndroidRuntime(837): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.ViewRootImpl.setView(ViewRootImpl.java:567) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:246) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.PopupWindow.invokePopup(PopupWindow.java:993) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:899) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.ListPopupWindow.show(ListPopupWindow.java:603) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.Spinner$DropdownPopup.show(Spinner.java:981) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.Spinner.performClick(Spinner.java:609) 12-10 09:58:41.988: E/AndroidRuntime(837): at spinner.onitemsel.SpinOnItemActivity.onCreate(SpinOnItemActivity.java:35) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.Activity.performCreate(Activity.java:5104) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 12-10 09:58:41.988: E/AndroidRuntime(837): ... 11 more 12-10 10:03:42.109: I/Process(837): Sending signal. PID: 837 SIG: 9 

My logcat Report

12-10 09:58:40.988: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.168: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.198: W/Trace(837): Unexpected value from nativeGetEnabledTags: 0 12-10 09:58:41.878: D/dalvikvm(837): GC_CONCURRENT freed 51K, 6% free 2830K/2996K, paused 12ms+3ms, total 56ms 12-10 09:58:41.878: D/dalvikvm(837): WAIT_FOR_CONCURRENT_GC blocked 25ms 12-10 09:58:41.968: D/AndroidRuntime(837): Shutting down VM 12-10 09:58:41.968: W/dalvikvm(837): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 12-10 09:58:41.988: E/AndroidRuntime(837): FATAL EXCEPTION: main 12-10 09:58:41.988: E/AndroidRuntime(837): java.lang.RuntimeException: Unable to start activity ComponentInfo{spinner.onitemsel/spinner.onitemsel.SpinOnItemActivity}: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.access$600(ActivityThread.java:141) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.os.Handler.dispatchMessage(Handler.java:99) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.os.Looper.loop(Looper.java:137) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-10 09:58:41.988: E/AndroidRuntime(837): at java.lang.reflect.Method.invokeNative(Native Method) 12-10 09:58:41.988: E/AndroidRuntime(837): at java.lang.reflect.Method.invoke(Method.java:511) 12-10 09:58:41.988: E/AndroidRuntime(837): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-10 09:58:41.988: E/AndroidRuntime(837): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-10 09:58:41.988: E/AndroidRuntime(837): at dalvik.system.NativeStart.main(Native Method) 12-10 09:58:41.988: E/AndroidRuntime(837): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.ViewRootImpl.setView(ViewRootImpl.java:567) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:246) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.PopupWindow.invokePopup(PopupWindow.java:993) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:899) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.ListPopupWindow.show(ListPopupWindow.java:603) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.Spinner$DropdownPopup.show(Spinner.java:981) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.widget.Spinner.performClick(Spinner.java:609) 12-10 09:58:41.988: E/AndroidRuntime(837): at spinner.onitemsel.SpinOnItemActivity.onCreate(SpinOnItemActivity.java:35) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.Activity.performCreate(Activity.java:5104) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 12-10 09:58:41.988: E/AndroidRuntime(837): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 12-10 09:58:41.988: E/AndroidRuntime(837): ... 11 more 12-10 10:03:42.109: I/Process(837): Sending signal. PID: 837 SIG: 9