이 null 포인터 예외를 알아낼 수 없습니다
https://stackoverflow.com//questions/20021588
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어댑터의 텍스트 필드에 OnClick Listener를 추가하고 있습니다.그 필드의 텍스트가 내 텍스트 입력 상자 (EDITTEXT1)에 게시 된 것으로 간단히 원합니다.그러나 아래 코드를 시도하고 있지만 EDTText1의 Pointng 라인에서 NullPoint 예외를 제공합니다.도움을 청하십시오
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
}
});
나는 실제로 그것을 longclick으로 만드는 것을 선호합니다.설정에 차이가 있습니까?
스택 추적
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>
해결책
조금 혼란스러워 보입니다. cr_room_name 내부에서 EditText1을 찾으려면 다음을 묻습니다.
Activity activity = (Activity) getContext();
editText1 = (EditText) activity.findViewById(R.id.cr_room_name);
그러나이 일이 일어나는 경우에도, 정말로보기와 활동을하는 것은 못생긴 방법이며, 관찰자 - 비처스 디자인 패턴으로 가야합니다.
다른 팁
static class ViewHolder {
TextView textView;
TextView timeView;
ImageView imageView;
View divider;
ImageButton but;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
appPrefs = new AppPreferences(context.getApplicationContext());
final ViewHolder holder;
final UserModel s = (UserModel) values.get(position);
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_user_item, parent, false);
holder.textView = (TextView) convertView.findViewById(R.id.label);
holder.timeView = (TextView) convertView.findViewById(R.id.list_time);
holder.imageView = (ImageView) convertView.findViewById(R.id.imageView1);
holder.divider = (View) convertView.findViewById(R.id.side_divider);
holder.but = (ImageButton) convertView.findViewById(R.id.details_list_button);
convertView.setTag(holder);
}
else
{holder = (ViewHolder) convertView.getTag();}
holder.timeView.setText(s.getTimePosted());
holder.textView.setText(s.getTitle());
return convertView;
}
여기에
을 보는 작업 getView의 예입니다.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.
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
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