我有一個適配器顯示兩個視圖的ListView - 一個checkedtextview和一個普通的textview。我想在用戶處於01時使用checkedtextview,因此他/她可以標記項目,並且當用戶不在MarkMode
中時我想使用textview。Android:適配器顯示兩個不同的視圖,但得到空指針
所以這裏是我的原代碼,它只有MarkMode
。
public class ContactsAdapter extends BaseAdapter {
private List<Contact> mData;
private LayoutInflater mInflater;
private Context context;
public ContactsAdapter(List<Contact> mData, Context context) {
this.mData = mData;
this.context = context;
mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return mData.size();
}
@Override
public String getItem(int position) {
switch (context.getSharedPreferences("settings",
HomeScreenActivity.MODE_PRIVATE).getInt("displayChoice", -1)) {
case 1:
return mData.get(position).getLastName() + " "
+ mData.get(position).getFirstName();
case 2:
return mData.get(position).getFirstName() + " "
+ mData.get(position).getMobileNumber();
case 3:
return mData.get(position).getLastName() + " "
+ mData.get(position).getMobileNumber();
default:
return mData.get(position).getFirstName() + " "
+ mData.get(position).getLastName();
}
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
CheckedTextView result;
if (convertView == null) {
result = (CheckedTextView) mInflater.inflate(
R.layout.home_screen_contacts_mark_view, parent, false);
} else {
result = (CheckedTextView) convertView;
}
final String contactRow = getItem(position);
result.setText(contactRow);
result.setBackgroundResource(R.drawable.list_selector);
return result;
}
}
現在我改成了這個,所以我可以改叫isMarkMode
所以它顯示了不同的看法類變量...
public class ContactsAdapter extends BaseAdapter {
private List<Contact> mData;
private LayoutInflater mInflater;
private Context context;
public static boolean inMarkMode = false;
public ContactsAdapter(List<Contact> mData, Context context) {
this.mData = mData;
this.context = context;
mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return mData.size();
}
@Override
public String getItem(int position) {
switch (context.getSharedPreferences("settings",
HomeScreenActivity.MODE_PRIVATE).getInt("displayChoice", -1)) {
case 1:
return mData.get(position).getLastName() + " "
+ mData.get(position).getFirstName();
case 2:
return mData.get(position).getFirstName() + " "
+ mData.get(position).getMobileNumber();
case 3:
return mData.get(position).getLastName() + " "
+ mData.get(position).getMobileNumber();
default:
return mData.get(position).getFirstName() + " "
+ mData.get(position).getLastName();
}
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
CheckedTextView result = null;
TextView normalResult = null;
if (inMarkMode) {
if (convertView == null) {
result = (CheckedTextView) mInflater.inflate(
R.layout.home_screen_contacts_mark_view, parent, false);
} else {
result = (CheckedTextView) convertView;
}
} else {
if (convertView == null) {
normalResult = (TextView) mInflater.inflate(
R.layout.home_screen_contacts_view, parent, false);
} else {
normalResult = (TextView) convertView;
}
}
final String contactRow = getItem(position);
result.setText(contactRow);
result.setBackgroundResource(R.drawable.list_selector);
normalResult.setText(contactRow);
normalResult.setBackgroundResource(R.drawable.list_selector);
if (inMarkMode) {
return result;
} else {
return normalResult;
}
}
}
}
最初,它看起來像它的工作,但隨後停止,我得到一個logcat錯誤,說這條線上有一個NullPointerException
:result.setText(contactRow);
我該如何解決這個問題?任何幫助,將不勝感激。
@ρяσѕρєяK謝謝你的作品。當日食不指出他們哈哈時,很難發現這些錯誤。如果你張貼你的答案,我可以接受它 – Ogen