我的列表視圖在滾動時不斷變化。我試圖在「消息」變量中顯示消息。當我第一次滾動時,一切都很好。但是當我再次滾動時,textviews重疊。我不確定問題是什麼。Android - 滾動時自定義listview更改?
public class DisplayMessageAdapter extends ArrayAdapter<Message> {
Context context;
int resource;
ArrayList<Message> messages = null;
public DisplayMessageAdapter(Context context, int resource, ArrayList<Message> messages) {
super(context, resource, messages);
this.context = context;
this.resource = resource;
this.messages = messages; //list of messages to display
}
@SuppressLint("NewApi")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
final MessagesHolder holder;
if(row == null)
{
//Log.i("row-null","row-null");
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(resource, parent, false);
holder = new MessagesHolder();
holder.sent = (TextView) row.findViewById(R.id.sent_message);
holder.received = (TextView) row.findViewById(R.id.received_message);
row.setTag(holder);
}
else
{
//Log.i("holder-not-null","holder-not-null");
holder = (MessagesHolder) row.getTag();
}
Message message = messages.get(position);
if(message.sent != null)
{
holder.sent.setText(message.sent);
holder.received.setBackground(null);
}
else
{
holder.received.setText(message.received);
holder.sent.setBackground(null);
}
return row;
}
static class MessagesHolder
{
TextView sent;
TextView received;
}
}
佈局XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:id="@+id/sent_message"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:textColor="#000000"
android:background="@drawable/sent"
android:layout_marginTop="4dp"
android:layout_marginBottom="4dp"
android:textSize="15sp"
/>
<TextView
android:id="@+id/received_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/rcvd"
android:layout_marginRight="20dp"
android:textColor="#000000"
android:layout_marginTop="4dp"
android:layout_marginBottom="4dp"
android:textSize="15sp"
/>
</RelativeLayout>
你有這個'holder.received.setText(message.received);'和這個'holder.sent.set.Text(message.sent);'兩次刪除其中的一個 – Raghunandan
@GrIsHu不需要那個coz op擴展ArrayAdapter並具有'super(上下文,資源,消息);' – Raghunandan