我在我的代码中使用处理程序在每个特定时间间隔更新应用程序。
为此，我编写了以下代码：
public class Messages extends Activity {
protected Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_messages);
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
String id = intent.getStringExtra(MainActivity.EXTRA_ID);
String[] lst = null;
ListView lm=(ListView)findViewById(R.id.listView1);
TextView tv = (TextView)findViewById(R.id.textView1);
tv.setText("Welcome " + message);
handler.postDelayed(new UpdateTask(),500);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.messages, menu);
return true;
}
class UpdateTask implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
setContentView(R.layout.activity_messages);
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
String id = intent.getStringExtra(MainActivity.EXTRA_ID);
String[] lst = null;
ListView lm=(ListView)findViewById(R.id.listView1);
TextView tv = (TextView)findViewById(R.id.textView1);
tv.setText("Welcome " + message);
CallSoap cs=new CallSoap();
lst=cs.GetMessage(id);
ArrayAdapter<String> adpt = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,lst);
lm.setAdapter(adpt);
handler.postDelayed(this, 500);
}
}
}
但它给了我错误：
ArrayAdapter<String> adpt = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,lst);
文本：Constructor ArrayAdapter is undefined.
请帮我。