我想实现我自己的ListView
,但我有一些问题。我有以下代码:
private ArrayList<ItemChat> itemsChat;
private ListView lv;
......
public void show (View v){
lv = (ListView)findViewById(R.id.listView);
itemsChat = new ArrayList<ItemChat>();
itemsChat.add(new ItemChat(1, "Patatas", "Tuberculo", "drawable/patatas"));
ItemChatAdapter adapter = new ItemChatAdapter(this, itemsChat);
lv.setAdapter(adapter);
}
onClick
在布局中,我有一个事件是“显示”的按钮。ItemChat.java
它工作正常,并显示我在类中定义的适配器。
但是,当我尝试调用另一种方法的相同代码时,它根本不起作用。
public void show2 (String c){
lv = (ListView)findViewById(R.id.listView);
itemsChat = new ArrayList<ItemChat>();
itemsChat.add(new ItemChat(1, "Patatas", c , "drawable/patatas"));
ItemChatAdapter adapter = new ItemChatAdapter(this, itemsChat);
lv.setAdapter(adapter);
}
两者的区别在于论点。首先,由于该onClick
事件,我通过 View V,其次,我尝试在适配器中显示String c
而不是“Tuberculo”,但它不起作用。有没有人有任何想法?
PS:onClick
event inshow()
来自 Eclipse 图形布局(继承自View.onClick
)
好的,这是我的完整代码。
我尝试实现一个 xmpp 客户端,它工作正常,连接到 gtalk 服务器,登录用户,并收到来自其他用户的消息。我可以在日志中看到收到的消息,所以我想在自定义列表视图中接收 mje(类似于 Wahtsapp 中的聊天)。
首先,我创建了一个自定义列表视图并实现了一个调用“显示”的按钮来测试它是否工作正常。
当我按下显示按钮时,我的自定义列表视图显示:图片、标题、描述和其他图片。它工作完美。
然后,我想在我的列表视图中更改描述,而不是它,放置收到的消息。所以我使用了一个方法 show(incoming message)
我的 main.xml 文件有 2 个按钮。Conectec 和 Show。
和列表视图,id = listView
有2个文件java
ItemChat.java ItemChatAdapter.java
和我的主要活动
公共类 MiCliente2 扩展 Activity {
private final static String SERVER_HOST = "talk.google.com";
private final static int SERVER_PORT = 5222;
private final static String SERVICE_NAME = "gmail.com";
private final static String LOGIN = "xxxxxxxx@gmail.com";
private final static String PASSWORD = "xxxxxxx";
private XMPPConnection conn2;
private MessageListener messageListener;
private ArrayList<ItemChat> itemsChat;
private ListView lv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mi_cliente2);
}
//when press conect button, implement this.
//it´s works perfect
public void conect (View v){
try
{
initConnection();
Log.i("XMPPClient","Server conected");
}
catch(XMPPException ex){
Log.e("XMPPClient","Error conecting to server");
}
}
private void initConnection() throws XMPPException {
ConnectionConfiguration config =
new ConnectionConfiguration(SERVER_HOST, SERVER_PORT, SERVICE_NAME);
conn2 = new XMPPConnection(config);
config.setReconnectionAllowed(true);
try {
conn2.connect();
Log.i("XMPPClient", " Connected to " + conn2.getHost());
} catch (XMPPException ex) {
Log.e("XMPPClient", "Failed to connect to " + conn2.getHost());
Log.e("XMPPClient", ex.toString());
}
try {
conn2.login(LOGIN, PASSWORD);
Log.i("XMPPClient", "Logged in as " + conn2.getUser());
Presence presence = new Presence(Presence.Type.available);
presence.setStatus("On line");
conn2.sendPacket(presence);
// register listeners
ChatManager chatmanager = conn2.getChatManager();
conn2.getChatManager().addChatListener(new ChatManagerListener()
{
public void chatCreated(final Chat chat, final boolean createdLocally)
{
chat.addMessageListener(new MessageListener()
{
public void processMessage(Chat chat, Message message)
{
Log.i("XMPPClient","Received message: "
+ (message != null ? message.getBody() : "NULL"));
// I want to call show() passing message´s body
show(message.getBody());
}
});
}
});
} catch (XMPPException ex) {
Log.e("XMPPClient", " Failed to log in as " + LOGIN);
Log.e("XMPPClient", ex.toString());
}
}
//Not work when call show("something")
public void show(String v) {
Log.i("XMPPClient",v); // in log can see Received message
lv = (ListView)findViewById(R.id.listView);
itemsChat = new ArrayList<ItemChat>();
itemsChat.add(new ItemChat(1, "Patatas", "Tuberculo", "drawable/patatas"));
ItemChatAdapter adapter = new ItemChatAdapter(this, itemsChat);
Log.i("XMPPClient"," In show() before lv.setAdapter");
lv.setAdapter(adapter);
//this log never happend, only can see before msje
Log.i("XMPPClient","In show() after lvsetAdapter");
}
//pressing "Show" button
public void show2 (View v){
lv = (ListView)findViewById(R.id.listView);
itemsChat = new ArrayList<ItemChat>();
itemsChat.add(new ItemChat(1, "Patatas", "Tuberculo", "drawable/patatas"));
ItemChatAdapter adapter = new ItemChatAdapter(this, itemsChat);
lv.setAdapter(adapter);
}
}
当传入消息和 show(meesage.getbody) 不显示任何内容时,在 logcat 中我只看到: Log.i("XMPPClient"," In show() before lv.setAdapter"); 不是列表视图。