Update : Reading other posts, I tried to trash the R.java file but it was not the cause.
On 7 avr, 19:48, e-satis <[email protected]> wrote: > Hi, > > My java code look like this : > > // right_arrow button > ImageButton arrow_button = (ImageButton)findViewById > (R.id.arrow); > arrow_button.setOnClickListener(new OnClickListener() { > public void onClick(View v) { > ((View)v.getParent().getParent()).setSelected(true); > } > }); > > And the corresponding XML look like : > > <LinearLayout xmlns:android="http://schemas.android.com/apk/res/ > android" > android:id="@+id/row_layout" > > > <LinearLayout android:id="@+id/row_checkbox_container"> > > <CheckBox android:id="@+id/row_checkbox" /> > > </LinearLayout> > > <LinearLayout android:id="@+id/item_title_container"> > > <TextView android:id="@+id/item_title"/> > > </LinearLayout> > > <LinearLayout android:id="@+id/right_arrow_container" > > > <ImageButton android:id="@+id/arrow" > android:layout_width="18px" > android:layout_height="fill_parent" > android:layout_gravity="bottom" > android:layout_weight="1" > android:src="@drawable/arrow" > android:background="#00000000"/> > > </LinearLayout> > > </LinearLayout> > > I got anullpointerexceptionright after running the app in the > emulator from eclipse on Ubuntu 8.10 : > > E/AndroidRuntime( 1426): java.lang.RuntimeException: Unable to start > activity ComponentInfo{com.getincontext/com.getincontext.InContext}: > java.lang.NullPointerException > E/AndroidRuntime( 1426): at > android.app.ActivityThread.performLaunchActivity(ActivityThread.java: > 2141) > E/AndroidRuntime( 1426): at > android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: > 2157) > E/AndroidRuntime( 1426): at android.app.ActivityThread.access$1800 > (ActivityThread.java:112) > E/AndroidRuntime( 1426): at android.app.ActivityThread$H.handleMessage > (ActivityThread.java:1581) > E/AndroidRuntime( 1426): at android.os.Handler.dispatchMessage > (Handler.java:88) > E/AndroidRuntime( 1426): at android.os.Looper.loop(Looper.java:123) > E/AndroidRuntime( 1426): at android.app.ActivityThread.main > (ActivityThread.java:3739) > E/AndroidRuntime( 1426): at java.lang.reflect.Method.invokeNative > (Native Method) > E/AndroidRuntime( 1426): at java.lang.reflect.Method.invoke > (Method.java:515) > E/AndroidRuntime( 1426): at com.android.internal.os.ZygoteInit > $MethodAndArgsCaller.run(ZygoteInit.java:739) > E/AndroidRuntime( 1426): at com.android.internal.os.ZygoteInit.main > (ZygoteInit.java:497) > E/AndroidRuntime( 1426): at dalvik.system.NativeStart.main(Native > Method) > E/AndroidRuntime( 1426): Caused by: java.lang.NullPointerException > E/AndroidRuntime( 1426): at com.getincontext.InContext.onCreate > (InContext.java:51) > E/AndroidRuntime( 1426): at > android.app.Instrumentation.callActivityOnCreate(Instrumentation.java: > 1122) > E/AndroidRuntime( 1426): at > android.app.ActivityThread.performLaunchActiv > > I searched in the other posts something similar, and It seems that it > must be because the ImageButton is set tonull. > > Unfortunately I can't find anything that would lead to it in the XML > or the Java code. The button is displayed properly and eclipse does > not detect any error. I guess this is runtime. > > I tried to cast from ImageButton to button but it doesn't change > anything. So I image the trouble is from findViewById(), but arrow to > exists, is a regular pgn file and is displayed by the emulator if this > line is commented. > > The weirdest is that I got a similar statement just above, and I can't > see any difference. > > Any clue ? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
