Ich kann diese NullPoint-Ausnahme nicht herausfinden

Question

Ich füge einem Textfeld in meinem Adapter einen onClick-Listener hinzu.Ich möchte lediglich, dass der Text in diesem Feld in mein Texteingabefeld (edittext1) geschrieben wird.Ich versuche den folgenden Code, er gibt mir jedoch eine NullPoint-Ausnahme in der Zeile, die auf edttext1 zeigt.Hilfe bitte

public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        LayoutInflater inflater2 = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater2.inflate(R.layout.activity_discuss, parent, false);

        if (row == null) {
            LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            if(type==1 || type==3)
                row = inflater.inflate(R.layout.listitem_discuss, parent, false);
            else if(type==4 || type==5)
                row = inflater.inflate(R.layout.listitem_users, parent, false);
            else
                row = inflater.inflate(R.layout.listitem_messages, parent, false);
        }

    //  


        final OneComment coment = getItem(position);

        userComment = (TextView) row.findViewById(R.id.comment);
        userImage = (ImageView) row.findViewById(R.id.place_img);
        userName = (TextView) row.findViewById(R.id.place_name);
        userOnlineImage = (ImageView) row.findViewById(R.id.pe_profile_pic);
        commentDate = (TextView) row.findViewById(R.id.place_distance);
        msgPic = (ImageView) row.findViewById(R.id.msgPic);

        userComment.setText(coment.comment);
        editText1 = (EditText) row.findViewById(R.id.cr_room_name);

        userName.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                editText1.setText("testing");
                Log.v("response","username selected");
                // TODO Auto-generated method stub

            }
            });

Eigentlich würde ich es lieber zu einem Longclick machen.Gibt es einen Unterschied im Setup?

Stack-Trace

11-16 12:46:29.100: E/AndroidRuntime(8047): FATAL EXCEPTION: main
11-16 12:46:29.100: E/AndroidRuntime(8047): java.lang.NullPointerException
11-16 12:46:29.100: E/AndroidRuntime(8047):     at com.peekatucorp.peekatu.DiscussArrayAdapter$1.onClick(DiscussArrayAdapter.java:129)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at android.view.View.performClick(View.java:4240)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at android.view.View$PerformClick.run(View.java:17721)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at android.os.Handler.handleCallback(Handler.java:730)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at android.os.Looper.loop(Looper.java:137)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at android.app.ActivityThread.main(ActivityThread.java:5103)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at java.lang.reflect.Method.invokeNative(Native Method)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at java.lang.reflect.Method.invoke(Method.java:525)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-16 12:46:29.100: E/AndroidRuntime(8047):     at dalvik.system.NativeStart.main(Native Method)

Actvity_discuss.xml

  <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" 
    >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/form"
        android:layout_alignParentTop="true"
        android:choiceMode="none"
        android:divider="#00000000"
        android:dividerHeight="@dimen/zerosize"
        android:footerDividersEnabled="false"
        android:headerDividersEnabled="false" 
        android:listSelector="@android:color/transparent">

    </ListView>

    <RelativeLayout
        android:id="@+id/form"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="40dp"
            android:background="@drawable/inputbg" >

            <!-- <Button
                android:id="@+id/postpic"
                android:layout_width="30dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@drawable/attachbtn" />  -->
  <!-- android:background="@drawable/sendbutton"  -->
            <EditText
                android:id="@+id/cr_room_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_toLeftOf="@+id/sendMessage"
                android:layout_weight="3"
                android:ems="10"
                android:hint="Enter Message"
                android:inputType="text" />

            <ImageView
                android:id="@+id/postpic"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:src="@drawable/picattach" />

            <Button
                android:id="@+id/sendMessage"
                style="@style/SingleGradient"
                android:layout_width="35dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

        </LinearLayout>

</RelativeLayout>

</RelativeLayout>

Answer 1

Es scheint ein wenig Verwirrung zu herrschen:Sie bitten darum, editText1 unter der ID zu finden cr_room_name :innen listitem_messages.xml, aber es ist anscheinend drinnen Actvity_discuss.xml.

Activity activity = (Activity) getContext();
editText1 = (EditText) activity.findViewById(R.id.cr_room_name);

Aber selbst wenn das funktioniert, ist es wirklich eine hässliche Art, eine Ansicht und eine Aktivität zu koppeln. Sie sollten sich besser für ein vom Beobachter beobachtbares Designmuster entscheiden.

Answer 2

generasacodicetagpre.

Hier ist ein Beispiel eines Working-GetViews, um über

zu suchen

Answer 3

Without logcat information it will be harder to tell but i am just guessing, can you make sure cr_room_name is actually in the activity_discuss.xml file. If it is in the activity_discuss layout file, then only after seeing the logcat we can figure out what might be the problem.

After seeing you stacktrace there is only one thing coming to my mind. Please make sure all of those view id's are in it's respective layout file.

As i can see from your layout and code, there is no place_name textview in your Actvity_discuss.xml file.

Since you are using different layout for different purposes make sure you do some null checking before actually referencing the view from getView and specially when you are setting a listener for a particular view.

Answer 4

Nullpoint is an easy problem to solve, sometimes because an object is not initialized, and you should debug to find out why. Many times the object is null, causing problems