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POandroid spinner -onItemSelected
 

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    <p>I am a Beginner. I have a problem with a spinner. I want to create a spinner by using onItemSelected method and to display that selected spinner item in TextView</p> <p>But my program is not running in emulator. it says "Program stopped".. what was my mistake in below program. Pls help me.. Thanks U..</p> <p>My SpinOnItemActivity.java</p> <pre><code>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.Button; import android.widget.Spinner; import android.widget.TextView; import android.view.View.OnClickListener; public class SpinOnItemActivity extends Activity { Spinner sp= (Spinner) findViewById(R.id.spin);; ArrayAdapter&lt;CharSequence&gt; adapter = ArrayAdapter.createFromResource( this, R.array.spinner_array , android.R.layout.simple_spinner_item); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_spin_on_item ); sp.performClick(); } public void onItemSelected(AdapterView&lt;?&gt; adapterView, View view, int i, long l) { adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); sp.setAdapter(adapter); String Name = (String) sp.getSelectedItem(); TextView tview1 = (TextView)findViewById(R.id.testtxt ); tview1.setText(Name); } } </code></pre> <p>My activity_spin_on_item.xml file</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".SpinActivity" &gt; &lt;Spinner android:id="@+id/spin" android:layout_width="149dp" android:layout_height="66dp" android:layout_alignBottom="@+id/button1" android:layout_alignParentLeft="true" android:layout_alignRight="@+id/testtxt" android:layout_gravity="top" /&gt; &lt;TextView android:id="@+id/testtxt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/testtxt2" android:layout_centerHorizontal="true" android:layout_marginBottom="44dp" android:gravity="bottom" android:text="Spin Txt" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>My logcat Report</p> <pre><code>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 </code></pre> <p>My Edited Code: Pls Check it out..</p> <pre><code> 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&lt;CharSequence&gt; 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&lt;?&gt; adapterView, View view, int i, long l) { String Name = (String) sp.getSelectedItem(); tview1 = (TextView)findViewById(R.id.testtxt ); tview1.setText(Name); } } </code></pre>
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    2. COi have attached my logcat report.. pls help me..
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    3. COji.. as ur update.. now i've following 2 errors.. 1.spin cannot be resolved or is not a field 2. testtxt cannot be resolved or is not a field but in R.java.. itz present.. public static final int spin=0x7f070000; public static final int testtxt=0x7f070002; wat to do
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