Question

我正在尝试学习Android并构建一个非常基本的ListView，使用ArrayAdapter设置的数据没有显示出来。我的var jwplayerClass = function(xx){ } jwplayerClass.prototype.setup = function(info) { var XWP = info.playlist[0].sources[0].file; alert(XWP); return this }; var jwplayer = function (xx) { return new jwplayerClass(xx); };代码是：

MainActivity类（默认无更改）

button.setDefault(True)

list_item_forecast.xml

Activity

`public class MainActivity extends AppCompatActivity {

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

       Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}`


**MainActivityFragment class**

    public class MainActivityFragment extends Fragment {

    private ListAdapter arrayAdapter;

    public MainActivityFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        ArrayList<String> myEntries = new ArrayList<String>();
        myEntries.add("Unix");
        myEntries.add("Java");
        myEntries.add("Android");

        arrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.list_item_forecast, R.id.list_forecast_item_textview, myEntries);


        ListView listView = (ListView)inflater.inflate(R.layout.fragment_main, container, false).findViewById(R.id.list_view_forecast);

listView.setAdapter(arrayAdapter);

        return inflater.inflate(R.layout.fragment_main, container, false);
    }
}

fragment_main.xml

<?xml version="1.0" encoding="utf-8"?>

activity_main.xml中

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content" android:layout_height="wrap_content"

    android:minHeight="?android:listPreferredItemHeight"
    android:gravity="center_vertical"
    android:text=""
    android:id="@+id/list_forecast_item_textview">

</TextView>

我的所有应用程序代码如上所示。我尝试调整代码并尝试this link但无法使其工作。请帮忙。

Answer 1

listview setAdapter listview不是您在fragment中返回的@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { ArrayList<String> myEntries = new ArrayList<String>(); myEntries.add("Unix"); myEntries.add("Java"); myEntries.add("Android"); arrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.list_item_forecast, R.id.list_forecast_item_textview, myEntries); View view =inflater.inflate(R.layout.fragment_main, container, false); ListView listView = (ListView)view .findViewById(R.id.list_view_forecast); listView.setAdapter(arrayAdapter); return view ; }。

function(field,order){
  if(field==="date"){
    return Tasks.find({},{sort:{createdAt:order}});
  }else{
    return Tasks.find({},{sort:{turtlelog.field:order}});
  }
}

ArrayAdapter没有将数据绑定到ListView

1 个答案: