小编Col*_*lin的帖子

现在我正在尝试使用EditText和一个按钮创建一个活动,在下面我可以动态地将列表添加到列表中.我试图模拟我的活动时遇到错误.

这是我的主要活动.

public class MainActivity extends Activity {

private Connection serverConnection;
private ArrayList<String> listItems = new ArrayList<String>();
private ArrayAdapter<String> adapter;

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


    ListView listview = (ListView) findViewById(R.id.list);
    adapter = new ArrayAdapter<String>(MainActivity.this, 0, listItems);
    listview.setAdapter(adapter);
    serverConnection = new Connection(MainActivity.this);

}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

public void displayMessage(String string) {
     listItems.add(string);
     adapter.notifyDataSetChanged();

}

} …