小编Gri*_*ese的帖子

我看了很多类似的问题,似乎无法发挥作用.我有一个带有这样功能的主类,编辑显示一个对话框,然后在按下按钮时编辑一个List.

public class EditPlayers extends SherlockFragmentActivity {

    listPlayerNames.setAdapter(new EditPlayerAdapter(ctx,
                R.layout.score_row_edit_player, listScoreEdit));

public void deletePlayer(final int position) {
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(
            EditPlayers.this);

    // Setting Dialog Title
    alertDialog.setTitle("Delete Player");

    // Setting Dialog Message
    alertDialog.setMessage("Are you sure?");

    // Setting Delete Button
    alertDialog.setPositiveButton("Delete",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    listScoreEdit.remove(position);
                    updateListView();
                }
            });

    // Setting Cancel Button
    alertDialog.setNeutralButton("Cancel",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });

    // Showing Alert Message
    alertDialog.show();
}

} …

现在我使用setAdapter更新我的ListView,但我认为正确的方法是使用notifiyDatasetChanged(),我不能让它在我的主类(它在适配器中)工作.这是错误:

对于ListAdapter类型,方法notifyDatasetChanged()未定义

我猜这有更好的方法 - 有人能指出我正确的方向吗？

这是我的代码的相关部分:

public class ScoreList extends SherlockFragmentActivity {

    private ListView listViewScore;

    static List<Score> listScore = new ArrayList<Score>();
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.score_list);
        ctx = this;
        listScore = dbh.getAllScores();

        listViewScore = (ListView) findViewById(R.id.score_list);

        listViewScore.setAdapter(new ScoreListAdapter(ctx,
                R.layout.score_row_item, listScore));
        listViewScore.getAdapter().notifyDatasetChanged(); //this is where I get the error
    }
}

这是适配器:

public class ScoreListAdapter extends ArrayAdapter<Score> {
    private int resource;
    private LayoutInflater inflater;

    public ScoreListAdapter(Context ctx, int resourceId, List<Score> objects) {
        super(ctx, resourceId, objects);
        resource = resourceId; …

我试图让我的应用程序在2.3中正常工作(它在4.0+中运行正常)和我遇到的一个问题是在我的listview上我无法获得所选项目的背景更改.我不确定我需要改变什么 - 有谁知道吗？

这是listview本身:

<ListView
    android:id="@+id/score_list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_above="@+id/keyboard"
    android:layout_below="@+id/sort_header"
    android:choiceMode="singleChoice"
    android:divider="#CCCCCC"
    android:dividerHeight="1dp"
    android:listSelector="@drawable/selector" />

这是在4.0+中工作的选择器(在2.3中没有颜色变化):

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:drawable="@color/highlight"/>
    <item android:state_pressed="true" android:drawable="@color/highlight"/>
    <item android:state_activated="true" android:drawable="@color/highlight"/>
    <item android:state_selected="true" android:drawable="@color/highlight"/>
</selector>

我实际上并不需要所有4个,但我想尝试一切.

如何将selectedPlayer设置为其他类的位置值？

我在这里已经阅读了一些类似的问题,但是我一直与我的变量和函数发生冲突.

ScoreList.java

public class ScoreList extends Activity {

    Integer selectedPlayer = 0;
}

ScoreListAdapter.java

public class ScoreListAdapter extends ArrayAdapter<Score> {

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        final OnClickListener lsScoreView = new OnClickListener() {
              @Override
                public void onClick(View v) {
                  //send position to main class here
              }
        };

    }
}

我使用这个SO问题作为指导,但是当我点击一行时它不会保持突出显示.我的代码出了什么问题？

score_list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/score_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@+id/keyboard"
        android:listSelector="@drawable/selector"
        android:choiceMode="singleChoice"
        android:divider="#CCCCCC"
        android:dividerHeight="1dp"
        android:paddingLeft="15dp"
        android:paddingRight="15dp" />
...
</RelativeLayout>

绘制/ selector.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:drawable="@color/highlight"/>
    <item android:state_pressed="true" android:drawable="@color/highlight"/>
</selector>

score_row_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scoreRowLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:background="@drawable/row_selector" >
...
</LinearLayout>

绘制/ row_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:drawable="@color/highlight" />
    <item android:state_activated="true" android:drawable="@color/highlight" />
    <item android:drawable="@color/transparent" />
</selector>

此代码现在可以正常运行.