Question

尝试使其工作......它加载正常，甚至告诉应用程序它已完成获取所有数据。但它并没有填充列表视图。

mArrayList.toString（）中的数据响应：[A，B，C，D]

public class MainActivity extends ActionBarActivity {
private static final String DEBUG_TAG = "MainActivity";
private boolean mAlternateTitle = false;
ListView lv;
private ArrayList<Show> mArrayList;
ShowsAdapter adapter;
AlertDialog mAlertDialog;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mArrayList = new ArrayList<Show>();
    lv = (ListView) findViewById(R.id.list);
    adapter = new ShowsAdapter(MainActivity.this, android.R.layout.simple_list_item_1, mArrayList);

    ShowsList show_list = new ShowsList();
    show_list.execute();

    lv.setAdapter(adapter);
    lv.setOnItemClickListener(new ListClickListener());
}

private class ShowsList extends AsyncTask<Void, Void, List<Show>> {
    @Override
    protected void onPreExecute() {
        mAlertDialog = new AlertDialog.Builder(MainActivity.this).setIcon(R.drawable.ic_action_refresh).setTitle(R.string.fetching_new).show();
    }

    @Override
    protected List<Show> doInBackground(Void... voids) {
        final String DEBUG_TAG = "MainActivity$ShowList$doInBackground";
        try {
            for (Show show : Show.getShows()) {
                Log.d(DEBUG_TAG, show.toString());
                mArrayList.add(show);
            };
            return mArrayList;
        } catch (Exception e) {
            new AlertDialog.Builder(MainActivity.this.getApplicationContext()).setIcon(android.R.drawable.ic_dialog_alert).setTitle(R.string.server_down_title).setMessage(R.string.server_down_message).setPositiveButton(R.string.app_quit, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    MainActivity.this.finish();
                }
            }).show();
            return null;
        }
    }

    @Override
    protected void onPostExecute(final List<Show> show_list) {
        if (mAlertDialog.isShowing()) {
            mAlertDialog.dismiss();
        }
        adapter.notifyDataSetChanged();
    }
}

private class ListClickListener implements AdapterView.OnItemClickListener {
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        Show show = mArrayList.get(i);
        Toast.makeText(MainActivity.this, "Clicked on a list item: " + show.title, Toast.LENGTH_LONG).show();
    }
}

private class ShowsAdapter extends ArrayAdapter<Show> {
    final String DEBUG_TAG = "MainActivity$ShowsAdapter";
    public ShowsAdapter(Context context, int textViewResourceId, List<Show> shows) {
        super(context, textViewResourceId, shows);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Show show = this.getItem(position);

        if (convertView == null) {
            convertView = getLayoutInflater().inflate(R.layout.list_row_show, parent, false);
        }
        ((TextView) convertView.findViewById(R.id.show_title)).setText(show.title);
        //Log.d(DEBUG_TAG, (String)((TextView) convertView.findViewById(R.id.show_title)).getText());
        //((TextView) convertView.findViewById(R.id.episode_number)).setText(episode.getGrayLine());
        return convertView;
    }
}

以防万一布局[main.xml]可能存在问题：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
    </ListView>

</FrameLayout>

list_show_row.xml：

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">

    <TextView
            android:textSize="17.0dip"
            android:textStyle="bold"
            android:textColor="#ff000000"
            android:gravity="center_vertical"
            android:id="@+id/show_title"
            android:layout_width="fill_parent"
            android:layout_height="0.0dip"
            android:text="Show Title"
            android:layout_weight="1.0"
            />

    <TextView
            android:textStyle="italic" android:textColor="#ff666666"
            android:id="@+id/episode_number"
            android:layout_width="fill_parent" android:layout_height="0.0dip" android:text="Episode Number" android:layout_weight="1.0" />

</LinearLayout>

Answer 1

不要在list_row_show.xml布局的根元素的layout_height上设置fill_parent。

无法使用AsyncTask填充ListView

1 个答案: