ClassCastException lors de l'utilisation de LinearLayout.LayoutParams

C'est l'exception:

07-20 19:52:14.193: E/AndroidRuntime(3908): FATAL EXCEPTION: main
07-20 19:52:14.193: E/AndroidRuntime(3908): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:634)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1249)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2265)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.View.measure(View.java:12892)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1240)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2628)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.os.Looper.loop(Looper.java:137)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at android.app.ActivityThread.main(ActivityThread.java:4507)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at java.lang.reflect.Method.invokeNative(Native Method)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at java.lang.reflect.Method.invoke(Method.java:511)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
07-20 19:52:14.193: E/AndroidRuntime(3908):     at dalvik.system.NativeStart.main(Native Method)

Je ne vois pas une ligne où l'exception est levée, donc je ne peux pas le comprendre tout à fait bonne. Je sais que c'est dans ces lignes:

public class TodayFragment extends Fragment {
ListView listView;
String[] urls;
ActionBar mActionBar;
Spinner spinner1;
public TodayFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
LinearLayout linear = new LinearLayout(getActivity());
linear.setOrientation(LinearLayout.VERTICAL);
spinner1 = new Spinner(getActivity());
spinner1.setLayoutParams(new LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
linear.addView(spinner1);
listView = new ListView(getActivity());
spinner1.setLayoutParams(new LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
linear.addView(listView);
new ParseHTML().execute();
return linear;
}
}

Le fragment que j'utilise est android.de soutien.v4.app.Le Fragment. Quelles sont les causes?

InformationsquelleAutor tolgap | 2012-07-20
  1. 16

    Votre instruction import pour LayoutParams est probablement l'importation de ViewGroup.LayoutParams. Essayez explicitement à l'aide de LinearLayout.LayoutParams(...):

       spinner1.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
    InformationsquelleAutor ab11
  2. 2

    Essayez de définir LinearLayout est LayoutParams " avant attatching enfants.

    LinearLayout linear = new LinearLayout(getActivity());
linear.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
linear.setOrientation(LinearLayout.VERTICAL);
    InformationsquelleAutor Iñigo
  3. 1

    Dans le cas où vous vous poseriez la question qui LayoutParams vous devez utiliser pour chaque Vue, regardez cette doc :

    Chaque point de vue doit avoir un LayoutParam acording à ses parents.

    Par exemple, afin de créer cette Vue hierarhy,

    • RelativeLayout relativeLayout
      • LinearLayout linearLayout , orientation: vertical
      • TextView textView
      • Bouton button1
      • Bouton bouton2

    remplacer le contenu de votre méthode onCreate dans votre activité principale, avec :

      super.onCreate(savedInstanceState);
RelativeLayout relativeLayout = new RelativeLayout(this);
LinearLayout linearLayout = new LinearLayout(this);
linearLayout.setOrientation(LinearLayout.VERTICAL);
linearLayout.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
relativeLayout.addView(linearLayout);
TextView textView = new TextView(this);
textView.setText("a text");
textView.setLayoutParams(new LinearLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
linearLayout.addView(textView);
Button button1 = new Button(this);
button1.setText("button 1");
button1.setLayoutParams(new LinearLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
linearLayout.addView(button1);
setContentView(relativeLayout);
    InformationsquelleAutor Maxime Ancelin