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這是我用來製作這樣的列表的代碼，但是當我滾動列表時它崩潰了。與不同的1行不同和其他全部相同的列表視圖。這裏是我的代碼：
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if (position == 0) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.custom_diary_listitem,
parent, false);
holder = new ViewHolder();
holder.tv_customItem_title = (TextView) convertView
.findViewById(R.id.custom_diary_listitem_tv_commenttitle);
holder.tv_customItem_date = (TextView) convertView
.findViewById(R.id.custom_diary_listitem_tv_commentdate);
holder.tv_customItem_comment = (TextView) convertView
.findViewById(R.id.custom_diary_listitem_tv_comment);
holder.btn_customItem_newcomment = (Button) convertView
.findViewById(R.id.custom_diary_listitem_btn_addnewcomment);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tv_customItem_title.setText(strDiaryDetailTitle);
holder.tv_customItem_date.setText(strCommentDate);
holder.tv_customItem_comment.setText(strCommentTitle);
holder.btn_customItem_newcomment
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
context.startActivity(new Intent(context,
NewCommentActivity.class));
}
});
} else {
if (convertView == null) {
convertView = inflater.inflate(layout, parent, false);
holder = new ViewHolder();
holder.tv_title = (TextView) convertView
.findViewById(R.id.newcomment_listitem_tv_content);
holder.tv_date = (TextView) convertView
.findViewById(R.id.newcomment_listitem_tv_date);
convertView.setTag(holder);
} else if (convertView.getId() != R.id.custom_diary_listitem_lin_main) {
convertView = inflater.inflate(layout, parent, false);
holder = new ViewHolder();
holder.tv_title = (TextView) convertView
.findViewById(R.id.newcomment_listitem_tv_content);
holder.tv_date = (TextView) convertView
.findViewById(R.id.newcomment_listitem_tv_date);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tv_title.setText(arrPostData.get(position - 1)
.getDiarySubTitle().get(position - 1));
holder.tv_date.setText(arrPostData.get(position - 1).getDiaryDate()
.get(position - 1));
}
return convertView;
}
class ViewHolder {
TextView tv_title, tv_date, tv_customItem_title, tv_customItem_date,
tv_customItem_comment, btn_customItem_newcomment;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public int getItemViewType(int position) {
if (position == 0) {
type = TYPE_ITEM1;
} else if (position == 1) {
type = TYPE_ITEM2;
}
return type;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public boolean areAllItemsEnabled() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isEnabled(int position) {
// TODO Auto-generated method stub
return false;
}
}
這裏是我的logcat： -
12-19 15:48:25.161: E/AndroidRuntime(1363): FATAL EXCEPTION: main
12-19 15:48:25.161: E/AndroidRuntime(1363): java.lang.NullPointerException
12-19 15:48:25.161: E/AndroidRuntime(1363): at com.vervesys.bmgo.adapter.CommentAdapter.getView(CommentAdapter.java:123)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.widget.AbsListView.obtainView(AbsListView.java:2251)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.widget.ListView.makeAndAddView(ListView.java:1769)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.widget.ListView.fillDown(ListView.java:672)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.widget.ListView.fillGap(ListView.java:636)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.widget.AbsListView.trackMotionScroll(AbsListView.java:5036)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3193)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.widget.AbsListView.onTouchEvent(AbsListView.java:3467)
12-19 15:48:25.161: E/AndroidRuntime(1363): at com.vervesys.bmgo.MyDetailDiary.onTouch(MyDetailDiary.java:124)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.View.dispatchTouchEvent(View.java:7122)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2170)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1905)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2176)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1919)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2176)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1919)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2176)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1919)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2176)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1919)
12-19 15:48:25.161: E/AndroidRuntime(1363): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1925)
12-19 15:48:25.161: E/AndroidRuntime(1363): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1379)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.app.Activity.dispatchTouchEvent(Activity.java:2396)
12-19 15:48:25.161: E/AndroidRuntime(1363): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1873)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.View.dispatchPointerEvent(View.java:7307)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3172)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3117)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4153)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4132)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4224)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:171)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:163)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:4203)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:4243)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.Choreographer.doFrame(Choreographer.java:523)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.os.Handler.handleCallback(Handler.java:615)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.os.Handler.dispatchMessage(Handler.java:92)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.os.Looper.loop(Looper.java:137)
12-19 15:48:25.161: E/AndroidRuntime(1363): at android.app.ActivityThread.main(ActivityThread.java:4745)
12-19 15:48:25.161: E/AndroidRuntime(1363): at java.lang.reflect.Method.invokeNative(Native Method)
12-19 15:48:25.161: E/AndroidRuntime(1363): at java.lang.reflect.Method.invoke(Method.java:511)
12-19 15:48:25.161: E/AndroidRuntime(1363): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-19 15:48:25.161: E/AndroidRuntime(1363): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-19 15:48:25.161: E/AndroidRuntime(1363): at dalvik.system.NativeStart.main(Native Method)
NPE上' CommentAdapter.java：123'。這條線是什麼？ – 2014-12-19 10:36:45
值是空的，但是當我通過放置斷點來調試代碼時，它顯示每個列表項中的值。 – user5111 2014-12-19 10:41:57