Question

我是初学者，所以请放轻松。我尝试显示列表视图，当我点击此列表视图中的一个项目时显示为已选中。为什么listview没有出现，以及我怎么做解决这个问题。谢谢！

MainActivity.java：

public class MainActivity extends Activity {

        CheckListActivity ck;

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

        ck=new CheckListActivity();     

    }

CheckListActivity.java：

public class CheckListActivity  extends ListActivity{

    /**
     * @param args
     */
    String[] presidents = {
            "Dwight D. Eisenhower",
            "John F. Kennedy",
            "Lyndon B. Johnson",
            "Richard Nixon",
            "Gerald Ford",
            "Jimmy Carter",
            "Ronald Reagan",
            "George H. W. Bush",
            "Bill Clinton",
            "George W. Bush",
            "Barack Obama"
            };

    ListView listview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        //list_view_rows    
         listview = (ListView)findViewById(R.id.listafisiere);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
        R.layout.list_view_rows, R.id.ListMea, presidents);
        listview.setAdapter(adapter);

    }


    @Override
    protected void onListItemClick(ListView parent, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(parent, v, position, id);
        Toast.makeText(this, "You have selected " + presidents[position],
                Toast.LENGTH_SHORT).show();
    }

}

Answer 1

你不需要2个活动来做到这一点。请尝试以下，它应该足够了：

public class MainActivity extends ListActivity {
    String[] presidents = {
            "Dwight D. Eisenhower",
            "John F. Kennedy",
            "Lyndon B. Johnson",
            "Richard Nixon",
            "Gerald Ford",
            "Jimmy Carter",
            "Ronald Reagan",
            "George H. W. Bush",
            "Bill Clinton",
            "George W. Bush",
            "Barack Obama"
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                R.layout.list_view_rows, R.id.ListMea, presidents);
        setListAdapter(adapter);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        Toast.makeText(this, "You have selected " + presidents[position],
                Toast.LENGTH_SHORT).show();
    }
}

修改

从另一个开始一项活动：

Intent intent = new Intent(this, NewActivity.class); startActivity(intent);

Answer 2

我建议像这样设置适配器。

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, presidents);
listview.setAdapter(adapter);

ListView没有出现

2 个答案: