以下是我的测试代码创建列表视图,列表视图显示成功,但是,点击事件中有错误。我想创建一个发送硬编码消息到新活动的意图。然而,它显示错误的线如何在Android的Listview中处理点击事件?
Intent intent = new Intent(context, SendMessage.class);
所以,问题是,我应该为这个类提供什么?
此外,而不是硬编码输出消息,如何捕获列表视图行中的数据并传递给新的活动?例如第一行为BBB,AAA,R.drawable.tab1_hdpi
。
谢谢。
public class MainActivity extends Activity {
public final static String EXTRA_MESSAGE = "com.example.ListViewTest.MESSAGE";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<ListEntry> members = new ArrayList<ListEntry>();
members.add(new ListEntry("BBB","AAA",R.drawable.tab1_hdpi));
members.add(new ListEntry("ccc","ddd",R.drawable.tab2_hdpi));
members.add(new ListEntry("assa","cxv",R.drawable.tab3_hdpi));
members.add(new ListEntry("BcxsadvBB","AcxdxvAA"));
members.add(new ListEntry("BcxvadsBB","AcxzvAA"));
members.add(new ListEntry("BcxvBB","AcxvAA"));
members.add(new ListEntry("BvBB","AcxsvAA"));
members.add(new ListEntry("BcxvBB","AcxsvzAA"));
members.add(new ListEntry("Bcxadv","AcsxvAA"));
members.add(new ListEntry("BcxcxB","AcxsvAA"));
ListView lv = (ListView)findViewById(R.id.listView1);
Log.i("testTag","before start adapter");
StringArrayAdapter ad = new StringArrayAdapter (members,this);
Log.i("testTag","after start adapter");
Log.i("testTag","set adapter");
lv.setAdapter(ad);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Intent intent = new Intent(context, SendMessage.class);
String message = "abc";
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
});
}
谢谢,无论如何,背景是什么意思? – user782104
你能改说吗? – Blackbelt
这意味着,Intent类中的第一个参数实际表示什么? MainActivity.this是什么意思?感谢文档 – user782104