Récupération de views d'un fichier xml dans le code java

[E-Kami]

Bonjour à tous!

Alors voilà je suis actuellement en train de réaliser une application sur android mais j'éprouve quelques difficultés. Mon problème est que quand j'essaye de récupérer un composant à l'intérieur d'un layout en xml et que j'y applique une de ses méthode, j'obtiens tout simplement une exception.

Avec le code ci-dessous:

public class WiFileManagerActivity extends Activity{

   public static final int DIALOG_STARTED = 0;
   public static final int DIALOG_EXITED = 1;
   public static final int DIALOG_HOST_NOT_FOUND= 2;
   private ServerInstance serverInstance;
   private static LookingForHostView lfhv;
   private CustomHostLoader cusDial = null;
   private Void v;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    showDialog(DIALOG_STARTED);
    lfhv = new LookingForHostView(this.getApplicationContext(), this);
    setContentView(lfhv);
    serverInstance = new ServerInstance(this);
    serverInstance.execute(v);
   }

   @Override
   protected Dialog onCreateDialog(int id) {

    switch(id) {
    case DIALOG_STARTED:
	    cusDial = new CustomHostLoader(this);
	    break;
    case DIALOG_EXITED:
	    break;
    case DIALOG_HOST_NOT_FOUND:
	    break;
    }

    return cusDial;
   }

   public void closeCustomHostLoaderDialog(){
    if(cusDial != null){
	    cusDial.cancel();
    }
   }
}

public class CustomHostLoader extends Dialog implements OnClickListener{
   private TextView hostTv;
   private ImageButton helpButton;

   public CustomHostLoader(Activity parentActivity) {
       super(parentActivity);
       setContentView(R.layout.host_loader);

       hostTv = (TextView) parentActivity.findViewById(R.id.hostTv);
       //Ici l'exception est déclenchée
       hostTv.getText();
   }

   public TextView getHostTv(){
       return hostTv;
   }

   @Override
   public void onClick(View arg0) {
       Log.i("ProgLog", "Yahoo");
   }

}

host_loader.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/layout_root"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="horizontal"
   android:padding="10dp" >

   <ProgressBar
    android:id="@+id/progressBar1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"/>

   <TextView
    android:id="@+id/hostTv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignTop="@+id/progressBar1"
    android:layout_toRightOf="@+id/progressBar1"
    android:layout_marginTop="18dp"
    android:layout_marginLeft="10dp"
    android:text="Looking for host. Please wait..." />

   <EditText
    android:id="@+id/editText1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/progressBar1"
    android:layout_alignRight="@+id/hostTv"
    android:layout_below="@+id/progressBar1"
    android:layout_marginTop="18dp"
    android:inputType="textPersonName" >
   </EditText>

   <Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/editText1"
    android:layout_alignRight="@+id/editText1"
    android:layout_below="@+id/editText1"
    android:text="Use this IP as host IP" />

   <ImageButton
    android:id="@+id/helpButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/button1"
    android:layout_alignTop="@+id/hostTv"
    android:layout_toRightOf="@+id/hostTv"
    android:src="@drawable/help" />

</RelativeLayout>

J'obtiens:

12-11 01:19:06.720: E/AndroidRuntime(23834): FATAL EXCEPTION: main

12-11 01:19:06.720: E/AndroidRuntime(23834): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wifilemanager.client/com.wifilemanager.client.activity.WiFileManagerActivity}: java.lang.NullPointerException

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.ActivityThread.access$500(ActivityThread.java:122)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.os.Handler.dispatchMessage(Handler.java:99)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.os.Looper.loop(Looper.java:132)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.ActivityThread.main(ActivityThread.java:4123)

12-11 01:19:06.720: E/AndroidRuntime(23834): at java.lang.reflect.Method.invokeNative(Native Method)

12-11 01:19:06.720: E/AndroidRuntime(23834): at java.lang.reflect.Method.invoke(Method.java:491)

12-11 01:19:06.720: E/AndroidRuntime(23834): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)

12-11 01:19:06.720: E/AndroidRuntime(23834): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)

12-11 01:19:06.720: E/AndroidRuntime(23834): at dalvik.system.NativeStart.main(Native Method)

12-11 01:19:06.720: E/AndroidRuntime(23834): Caused by: java.lang.NullPointerException

12-11 01:19:06.720: E/AndroidRuntime(23834): at com.wifilemanager.client.dialog.CustomHostLoader.<init>(CustomHostLoader.java:29)

12-11 01:19:06.720: E/AndroidRuntime(23834): at com.wifilemanager.client.activity.WiFileManagerActivity.onCreateDialog(WiFileManagerActivity.java:46)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.Activity.onCreateDialog(Activity.java:2758)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.Activity.createDialog(Activity.java:936)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.Activity.showDialog(Activity.java:2851)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.Activity.showDialog(Activity.java:2810)

12-11 01:19:06.720: E/AndroidRuntime(23834): at com.wifilemanager.client.activity.WiFileManagerActivity.onCreate(WiFileManagerActivity.java:33)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.Activity.performCreate(Activity.java:4397)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)

12-11 01:19:06.720: E/AndroidRuntime(23834): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)

12-11 01:19:06.720: E/AndroidRuntime(23834): ... 11 more

Quelqu'un saurait comment résoudre ce problème? Ce que je cherche à faire est simple en fait, c'est de pouvoir récupérer des composants de mon layout host_loader.xml dans le code java de ma classe CustomHostLoader et ainsi les modifier à ma guise, comme faire un hostTv.setText("Hello world!") par exemple. Merci d'avance

[E-Kami]

Problème résolu, il suffisait de changer

hostTv = (TextView) parentActivity.findViewById(R.id.hostTv);

en

hostTv = (TextView) findViewById(R.id.hostTv);

Ayant utilisé le code suivant auparavant:

public class CustomHostLoader extends Dialog implements OnClickListener{
   private TextView hostTv;
   private ImageButton helpButton;

   public CustomHostLoader(Activity parentActivity) {
       super(parentActivity.getApplicationContext());
       setContentView(R.layout.host_loader);

       hostTv = (TextView) findViewById(R.id.hostTv);
       hostTv.setText("Hello world!");
   }

   public TextView getHostTv(){
       return hostTv;
   }

   @Override
   public void onClick(View arg0) {
       Log.i("ProgLog", "Yahoo");
   }

}

renvoyait la même erreur... Je dois avouer que android prête vraiment à confusion sur certains aspects. Comme l'impact qu'a le simple fait de ne pas donner le bon argument au constructeur...