java - 如何在 ListView 到达末尾时向其添加项目

Question

现在我有一个 ListView，其中充满了我的“位置”对象。我的 list 中最初有 10 项。当我读完时，我想再添加 10 个项目。

代码:

public class MainActivity extends ActionBarActivity {

ListView listView;
int startLoop, endLoop;
ArrayList<Location> arrayOfLocations;
LocationAdapter adapter;
Button refresh;
private ProgressDialog progress;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_main);
    startLoop = 0;
    endLoop = 10;
    listView = (ListView) findViewById(R.id.listView1);
    progress = new ProgressDialog(this);
    listView.setOnScrollListener((OnScrollListener) this);

    // Construct the data source
    arrayOfLocations = new ArrayList<Location>();

    // Create the adapter to convert the array to views
    adapter = new LocationAdapter(this, arrayOfLocations);

    FillLocations myFill = new FillLocations();
    myFill.execute();

}

@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;
}

@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();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

private class FillLocations extends AsyncTask<Integer, Void, ArrayList<Location>> {

    protected void onPreExecute() {

    }

    @Override
    protected ArrayList<Location> doInBackground(Integer... params) {

            for (int i = startLoop; i < endLoop; i++) {

                                    String title = "Place " + Integer.toString(i);
                locArray.add(new Location(title, "details","hours","distance:)));

            }

        return locArray;
    }

    protected void onPostExecute(ArrayList<Location> listOfLocs) {
        // Attach the adapter to a ListView

        for (Location location : listOfLocs)
            adapter.add(location);

        listView.setAdapter(adapter);

        progress.dismiss();

    }
}

}

所以基本上我想要这样的东西: 1.检测何时到达终点 2.loopStart和loopEnd加10 3.调用我的 FillLocations 任务

关于如何实现这一点有什么想法吗？谢谢

Answer 1

你要么想要:

1. 填充新项目时加载文本/动画:How to display a "Loading..." text while retrieving items for a ListView

2. 一个简单的无尽列表，没有花哨的东西:endless scroll list view in android

3. 用户通过拉动刷新机制触发填充:How to implement Android Pull-to-Refresh