laker jin

great deore！

after weeken，this programe have normal work！

so thank you，i don‘t know by my poor english to how to discrible my thanks, luck to you!

Pramod P Deore wrote:And welcome to JavaRanch

so thank you，deore！

the site is so likely! ilike it！

about my problem，it still have erroe, i have change it as you said.

the log is:
01-19 05:01:39.397: ERROR/AndroidRuntime(14698): Uncaught handler: thread main exiting due to uncaught exception 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): java.lang.RuntimeException: Unable to start activity ComponentInfo{hello.pak/hello.pak.hrllo_act}: java.lang.NullPointerException 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.os.Handler.dispatchMessage(Handler.java:99) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.os.Looper.loop(Looper.java:123) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.app.ActivityThread.main(ActivityThread.java:4203) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at java.lang.reflect.Method.invokeNative(Native Method) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at java.lang.reflect.Method.invoke(Method.java:521) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at dalvik.system.NativeStart.main(Native Method) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): Caused by: java.lang.NullPointerException 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at hello.pak.hrllo_act.onCreate(hrllo_act.java:17) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 01-19 05:01:39.397: ERROR/AndroidRuntime(14698): ... 11 more 01-19 05:02:41.497: ERROR/power(985): Failed setting last user activity: g_error=0

and i found eclips ,its "Error log" table recommd "argement cant be null"

again thank you !

hrloo.java

package hello.pak; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class hrllo_act<heloo> extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btn=(Button)findViewById(R.id.go); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { EditText edt=(EditText)findViewById(R.id.edt); TextView txt= (TextView)findViewById(R.id.txt); txt.setText(getString(R.string.go)+edt.getText()); } }); } }

main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layout" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/txt" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <EditText id="@+id/edt" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> <Button id="@+id/go" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/go"> <requestFocus /> </Button> </LinearLayout>

strings.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello World, hrllo_act!</string> <string name="app_name">heloo_app</string> <string name="go">go,go,go</string> </resources>

i think maybe folowing code have error:
EditText edt=(EditText)findViewById(R.id.edt); TextView txt= (TextView)findViewById(R.id.txt);

thank you!