我将onClick侦听器添加到适配器中的文本字段。我只想将该字段中的文本发布到我的文本输入框（edittext1）。我正在尝试下面的代码，但它在edttext1的行指向给我一个NullPoint异常。请帮忙
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
}
});
我实际上更喜欢将其设为Longclick。设置是否存在差异。
堆栈跟踪
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>
答案 0 :(得分：0)
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;
}
这是一个有效的getView示例，供您查看
答案 1 :(得分：0)
如果没有logcat信息，它将更难说，但我只是猜测，你能否确保cr_room_name实际上在activity_discuss.xml文件中。如果它在activity_discuss布局文件中，那么只有在看到logcat之后我们才能找出可能存在的问题。
在看到你的堆栈跟踪之后，我脑海中只有一件事。请确保所有这些视图ID都在其相应的布局文件中。
正如我从您的布局和代码中看到的那样，您的Actvity_discuss.xml文件中没有place_name textview。
由于您使用不同的布局用于不同的目的，因此请确保在实际引用getView中的视图之前进行一些空检查，特别是在为特定视图设置侦听器时。
答案 2 :(得分：0)
似乎有点混乱：您要求在cr_room_name内找到editText1：listitem_messages.xml内，但它显然位于Actvity_discuss.xml内。
Activity activity = (Activity) getContext();
editText1 = (EditText) activity.findViewById(R.id.cr_room_name);
但是，即使这样可行，但是将视图和活动结合起来真的是一种丑陋的方式，你最好选择一种观察者可观的设计模式。
答案 3 :(得分：-1)
空点是一个很容易解决的问题，有时是因为未初始化对象，因此应进行调试以找出原因。很多时候该对象为空，从而导致问题