当我们向下滚动或向上滚动getview问题？ getview没有被正确调用？ 在背景图像从相应的网址加载？ 发送者和接收者的布局不同..
公共类NewReadMessageAdapter扩展BaseAdapter { 私有上下文上下文;
private LayoutInflater vi;
public ImageLoader imageLoader;
private Typeface tf;
private class Image {
String pic_url = new String();
Bitmap thumb;
String messege = new String();
int id;
String time = new String();
String sender_name = new String();
public boolean sender_user;
}
private Image[] images;
ArrayList<Messages> messages = new ArrayList<Messages>();
private TextView txt_msg;
private TextView txt_name;
private TextView txt_time;
Button btn_loc;
private ImageView img;
private ArrayList<Messages> mData = new ArrayList<Messages>();
private TreeSet<Integer> mSeparatorsSet = new TreeSet<Integer>();
private static final int TYPE_RECEIVER = 0;
private static final int TYPE_SENDER = 1;
public NewReadMessageAdapter(Context context,
ReadMessagePostParser messageParser, String sender_id,
String reciever_id) {
this.context = context;
tf = Typeface.createFromAsset(context.getAssets(), "fonts/tahoma.ttf");
messages = messageParser.getMessages();
imageLoader = new ImageLoader(context.getApplicationContext());
images = new Image[messages.size()];
for (int i = 0, j = messages.size(); i < j; i++) {
images[i] = new Image();
images[i].messege = messages.get(i).getMessage_text();
images[i].time = messages.get(i).getTime();
if (messages.get(i).getMessage_from().equals("YES")) {
images[i].sender_name = messageParser.sender_name;
images[i].pic_url = messageParser.sender_pic_url;
images[i].sender_user = true;
images[i].id = Integer.parseInt(sender_id);
} else {
images[i].sender_user = false;
images[i].id = Integer.parseInt(reciever_id);
images[i].sender_name = messageParser.reciever_name;
images[i].pic_url = messageParser.receiver_pic_url;
}
}
for (int i = 0; i < images.length; i++) {
System.out.println(images[i].pic_url + " " + images[i].sender_name
+ " " + images[i].messege);
}
vi = LayoutInflater.from(context);
imageLoader = new ImageLoader(context.getApplicationContext());
}
public void addItem(final Messages item) {
mData.add(item);
notifyDataSetChanged();
}
public void addSeparatorItem(final Messages item) {
mData.add(item);
mSeparatorsSet.add(mData.size() - 1);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return mData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemViewType(int position) {
return mSeparatorsSet.contains(position) ? TYPE_SENDER : TYPE_RECEIVER;
}
@Override
public View getView( int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
int type = getItemViewType(position);
if (convertView == null) {
switch (type) {
case TYPE_SENDER:
System.out.println("Sender");
holder = new ViewHolder();
convertView = vi.inflate(R.layout.list_row_layout_sender, null);
holder.txt_msg = (TextView) convertView
.findViewById(R.id.txt_msg);
holder.txt_name = (TextView) convertView
.findViewById(R.id.txt_name);
holder.txt_time = (TextView) convertView
.findViewById(R.id.txt_time);
holder.img = (ImageView) convertView
.findViewById(R.id.user_img);
holder.btn_loc = (Button) convertView
.findViewById(R.id.btn_loc);
convertView.setTag(holder);
break;
case TYPE_RECEIVER:
System.out.println("Receiver");
convertView = vi.inflate(R.layout.list_row_layout_receiver, null);
holder = new ViewHolder();
holder.txt_msg = (TextView) convertView
.findViewById(R.id.txt_msg);
holder.txt_name = (TextView) convertView
.findViewById(R.id.txt_name);
holder.txt_time = (TextView) convertView
.findViewById(R.id.txt_time);
holder.img = (ImageView) convertView
.findViewById(R.id.user_img);
holder.btn_loc = (Button) convertView
.findViewById(R.id.btn_loc);
convertView.setTag(holder);
break;
}
} else {
holder = (ViewHolder)convertView.getTag();
}
holder.btn_loc.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
System.out
.println("-------------- btn_loc ------------------- Sender");
Developer.callIntent_userlocation(context, "18.50929796 ",
"73.79045371");
}
});
holder.txt_name.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("----Name----");
}
});
holder.img.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("----Image----");
}
});
holder.txt_name.setText(mData.get(position).message_from);
holder.txt_time.setText(mData.get(position).time);
holder.txt_msg.setText(mData.get(position).message_text);
if (position != 0) {
cached = images[position - 1];
if (cached.sender_user == flag) {
holder.img.setVisibility(ImageView.INVISIBLE);
holder.txt_name.setVisibility(TextView.INVISIBLE);
} else
imageLoader.DisplayImage(images[position].pic_url.trim()
.replace(" ", "%20"), ReadMessageActivityNew.activity,
holder.img);
} else
imageLoader.DisplayImage(
images[position].pic_url.trim().replace(" ", "%20"),
ReadMessageActivityNew.activity, holder.img);
return convertView;
}
static class ViewHolder {
TextView txt_msg;
TextView txt_name;
TextView txt_time;
ImageView img;
Button btn_loc;
}
}
答案 0 :(得分：0)
最好只在两个布局相同时重用convertView。由于此处的布局不同，当您重复使用发送方用于接收方的convertView时，视图可能与预期不符。