Update : setContentView first and before all, checked :-)
On 7 avr, 20:09, e-satis <info.ksam...@googlemail.com> wrote:
> 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 <info.ksam...@googlemail.com> 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 ?
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