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在我的应用程序中，我从网上下载了一个字符串列表

然后我正在使用 AsyncTask 更新我的活动的列表视图。在 prePostExecute 时创建数组适配器（私有成员）

在 doInBackground 我下载列表并返回它

在 onPostExecute 我将返回的列表设置为适配器，然后连接列表视图和适配器

在我的活动中，我只看到 1 个空白元素（而不是 2 个元素），当我单击它时，我可以看到文本，但当我不是空白时。

另外，当我的适配器不是 android.R.layout.simple_list_1 而是 android.R.layout.acitiviy_list_item （和 2 个其他模板）时，我可以看到 2 个带有可见文本的元素，但文本又小又灰

代码：XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/parent"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:orientation="vertical" >

    <TableRow
        android:id="@+id/tableRow0"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="5dip" >

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:background="#4CB8FB"
            android:gravity="center"
            android:text="Search"
            android:textColor="#FAFAFA"
            android:textSize="40sp" />
    </TableRow>

    <EditText
        android:id="@+id/searchInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:drawableLeft="@drawable/ic_btn_search" />

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fastScrollEnabled="true"
        android:scrollingCache="true" >
    </ListView>

</LinearLayout>

后面的代码

public class ProductPickerActivity extends Activity {
    private ListView listView;
    private EditText inputSearch;
    private ArrayAdapter<String> adapter;
    private final Integer PRODUCT_REQUEST_ID = 5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_product_listview);

        inputSearch = (EditText) findViewById(R.id.searchInput);

        inputSearch.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                // When user changed the Text
                ProductPickerActivity.this.adapter.getFilter().filter(cs);
            }

            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
            }

            @Override
            public void afterTextChanged(Editable arg0) {
            }
        });
        new InitializeUi().execute(this);
        setupUI(findViewById(R.id.parent));
    }

    private class InitializeUi extends AsyncTask<Object, Void, List<IProduct>> {
        @Override
        protected void onPreExecute() {
            // Get ListView object from xml
            listView = (ListView) findViewById(R.id.list);

            // Define a new Adapter
            // First parameter - Context
            // Second parameter - Layout for the row
            // Third parameter - ID of the TextView to which the data is written
            // Forth - the Array of data

            adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.activity_list_item, new ArrayList<String>());

            // ListView Item Click Listener
            listView.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    // ListView Clicked item index
                    int itemPosition = position;

                    // ListView Clicked item value
                    String itemValue = (String) listView.getItemAtPosition(position);

                    Intent intent = new Intent(getApplicationContext(), ProductViewActivity.class);
                    intent.putExtra("ProductName", itemValue);
                    startActivityForResult(intent, PRODUCT_REQUEST_ID);
                }

            });
        }

        @Override
        protected List<IProduct> doInBackground(Object... params) {
            // Defined Array values to show in ListView
            IProductManager manager = new ProductManager(getApplicationContext());
            // download from web
            List<IProduct> lst = manager.GetProductList();
            return lst;
        }

        @Override
        protected void onPostExecute(List<IProduct> lst) {

            String[] values = new String[lst.size()];
            Integer i = 0;

            for (IProduct p : lst) {
                values[i] = p.getName();
                i = i + 1;
                Log.d("ProductPickerActivity", "Got Values : " + p.getName());

                adapter.add(p.getName());

                adapter.notifyDataSetChanged();

            }

            // Assign adapter to ListView
            listView.setAdapter(adapter);

            adapter.notifyDataSetChanged();

            ((BaseAdapter) listView.getAdapter()).notifyDataSetChanged();

            listView.refreshDrawableState();

        }

    }
}
4

1 回答 1

0

应用下面的编辑代码onPostExecute希望它的工作

 // Assign adapter to ListView
 listView.setAdapter(adapter);

//then add values to adatper
  String [] values = new String[lst.size()];
   int i =0; //<<-- change to int
           for(IProduct p : lst)
             {
                values[i] = p.getName();
                i++;//<-- add +1
                Log.d("ProductPickerActivity","Got Values : "+p.getName());
                adapter.add(p.getName());
             }
//finaly notify adapter data changed
 adapter.notifyDataSetChanged();
于 2013-11-04T19:04:05.060 回答