Question

我从服务器收到消息我希望在列表视图中显示它。用户阅读消息后，我想将文本视图的颜色更改为灰色，因为我想区分读取和未读消息。

Answer 1

您需要创建CustomAdapter。并在getView()中为已读/未读邮件设置条件，并根据需要更改文字颜色。

试试这个

<强> CustomListAdapter.java：

public class CustomListAdapter extends BaseAdapter {

private Context context;
private ArrayList<MessageData> dataList;

public CustomListAdapter(Context context, ArrayList<MessageData> arr) {
    super();
    this.context = context;
    this.dataList = arr;

}

@Override
public int getCount() {
    return dataList.size();
}

@Override
public Object getItem(int position) {
    return dataList.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View view, ViewGroup viewGroup) {

    if (view == null) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.listitem_spinner, null);

    }

    TextView textView = (TextView) view.findViewById(R.id.txt_spinner_item);

    textView.setText("" + dataList.get(position).getMessage());

    // here you can get Read/Unread status for all message
    boolean isRead = dataList.get(position).isRead();

    if (isRead) {
        textView.setTextColor(Color.GRAY);
    } else {
        textView.setTextColor(Color.BLACK);
    }

    return view;
}

}

然后从mainactivity调用

<强> MainActivity.java：

public class MainActivity extends Activity {

ListView listView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.requestview);

    listView = (ListView) findViewById(R.id.mylist_pendingtask);

    ArrayList<MessageData> arrMessageData = new ArrayList<MainActivity.MessageData>();

    MessageData data1 = new MessageData();
    data1.setMessage("message 1");
    data1.setRead(true);

    MessageData data2 = new MessageData();
    data2.setMessage("message 2 (unread)");
    data2.setRead(false);

    MessageData data3 = new MessageData();
    data3.setMessage("message 3");
    data3.setRead(true);

    arrMessageData.add(data1);
    arrMessageData.add(data2);
    arrMessageData.add(data3);

    CustomListAdapter adapter = new CustomListAdapter(this, arrMessageData);
    listView.setAdapter(adapter);

}

public class MessageData {

    String message = "";
    boolean isRead = false;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public boolean isRead() {
        return isRead;
    }

    public void setRead(boolean isRead) {
        this.isRead = isRead;
    }

}

}

Android在读取后更改listview中消息的颜色

1 个答案: