6

我有一个 DialogFragment，它有一个带有 CheckedTextView 的列表视图和一个顶部的复选框，用于检查和取消选中列表视图中的所有项目。我正在尝试根据 CheckAll 复选框的状态将 CheckedTextView 的状态设置为 Checked/Unchecked。但我无法使用 notifyDataSetChanged 相应地更新视图。 在此处输入图像描述

CategoriesDialogFragment.java

public class CategoriesDialogFragment extends SherlockDialogFragment {
    CheckBox checkAll;
    ListView categoriesListView;
    CategoriesListAdapter adapter;
    static Category category;

    String[] categories = new String[] { "Hill Station", "Beach", "Historic",
            "Wild Life", "Waterfall", "River", "Archeology", "Hill Station",
            "Beach", "Historic", "Wild Life", "Waterfall", "River",
            "Archeology" };
    Boolean[] categories_state = new Boolean[] { true, false, true, true, true,
            true, false, true, false, true, true, true, true, false };

    public static CategoriesDialogFragment newInstance() {
        CategoriesDialogFragment frag = new CategoriesDialogFragment();
        Bundle args = new Bundle();
        frag.setArguments(args);
        return frag;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Dialog dialog = new Dialog(MainActivity.context);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        dialog.setContentView(R.layout.dialog_categories);

        categoriesListView = (ListView) dialog
                .findViewById(R.id.listViewDialog);

        List<Category> theCategories = new ArrayList<Category>();
        for (int i = 0; i < categories.length; i++) {
            Boolean flag;
            Category pl = new Category(categories[i], categories_state[i]);
            theCategories.add(pl);
        }

        // categoriesListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        adapter = new CategoriesListAdapter(MainActivity.context,
                R.layout.dialog_list_item_category, theCategories);

        categoriesListView.setAdapter(adapter);

        // List View Item Click Listener
        categoriesListView
                .setOnItemClickListener(new AdapterView.OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> parent, View view,
                            int position, long id) {
                        // TODO Auto-generated method stub
                        CategoriesListAdapter adapter = (CategoriesListAdapter) parent
                                .getAdapter();
                        Category c = (Category) adapter.getItem(position);
                        c.setChecked(!c.getChecked());
                        adapter.notifyDataSetChanged();
                    }

                });


        // CheckAll CheckBox
        checkAll = (CheckBox) dialog.findViewById(R.id.checkBoxAll);
        checkAll.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {

                Toast.makeText(MainActivity.context, "Check",
                        Toast.LENGTH_SHORT).show();
                for (int i = 0; i < adapter.getCount(); i++) {
                    categoriesListView.setItemChecked(i, isChecked);
                    Log.i("Nomad", isChecked + " isChecked " + i);
                }
                adapter.notifyDataSetChanged();

                /*
                 * if (isChecked) { Log.i("Nomad", "isChecked"); for (int i = 0;
                 * i < adapter.getCount(); i++) { category = adapter.getItem(i);
                 * category.setChecked(true); Log.i("Nomad", "isChecked "+i); }
                 * adapter.notifyDataSetChanged(); } else { Log.i("Nomad",
                 * "isUnChecked"); for (int i = 0; i < adapter.getCount(); i++)
                 * { category = adapter.getItem(i); category.setChecked(false);
                 * Log.i("Nomad", "isUnChecked "+i); }
                 * adapter.notifyDataSetChanged(); }
                 */

            }
        });
        return dialog;

    }

    private static class CategoriesListAdapter extends ArrayAdapter<Category> {
        public Context mContext;

        List<Category> mCategories;

        public CategoriesListAdapter(Context context, int resource,
                List<Category> categories) {
            super(context, resource, categories);
            // TODO Auto-generated constructor stub
            this.mCategories = categories;
            this.mContext = context;

        }

        public int getCount() {
            return mCategories.size();
        }

        @Override
        public Category getItem(int position) {
            // TODO Auto-generated method stub
            return mCategories.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

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

            ViewHolder holder;

            if (convertView == null) {
                LayoutInflater viewInflater;
                viewInflater = LayoutInflater.from(getContext());
                convertView = viewInflater.inflate(
                        R.layout.dialog_list_item_category, null);

                holder = new ViewHolder();
                holder.categoryName = (CheckedTextView) convertView
                        .findViewById(R.id.categories_checkbox);

                convertView.setTag(holder);

            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            holder.categoryName.setText(mCategories.get(position)
                    .getCategoryName());
            holder.categoryName.setChecked(mCategories.get(position)
                    .getChecked());

            return convertView;
        }

        static class ViewHolder {
            CheckedTextView categoryName;
        }
    }
}

类别.java

public class Category {
    String categoryName = "";
    private boolean checked = false;

    public Category(String categoryName, boolean checked) {

        this.categoryName = categoryName;
        this.checked = checked;

    }

    public String getCategoryName() {
        return categoryName;
    }

    public void setCategoryName(String categoryName) {
        this.categoryName = categoryName;
    }

    public boolean getChecked() {
        return checked;
    }

    public void setChecked(boolean checked) {
        this.checked = checked;
    }

}

dialog_categories.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/parentPanel"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dip"
    android:layout_marginStart="8dip"
    android:background="@color/primary_white"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/title_template"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dip"
        android:layout_marginStart="16dip"
        android:gravity="center_vertical|start"
        android:orientation="horizontal"
        android:paddingTop="5dp" >

        <TextView
            android:id="@+id/textView1"
            style="?android:attr/textAppearanceLarge"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:paddingLeft="10dp"
            android:text="@string/dialog_category_title"
            android:textColor="@color/primary_color"
            android:textSize="22sp" />

        <TextView
            android:id="@+id/all"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/dialog_category_checkbox"
            android:textColor="@color/primary_color" />

        <CheckBox
            android:id="@+id/checkBoxAll"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingRight="6dp" />
    </LinearLayout>

    <View
        android:id="@+id/titleDivider"
        android:layout_width="match_parent"
        android:layout_height="2dip"
        android:background="@color/black" />

    <LinearLayout
        android:id="@+id/contentPanel"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:minHeight="64dp"
        android:orientation="vertical" >

        <ListView
            android:id="@+id/listViewDialog"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
        </ListView>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/buttonPanel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <Button
            android:id="@+id/button_category_ok"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/dialog_category_btn_ok"
            android:textSize="14sp" />
    </LinearLayout>

</LinearLayout>

dialog_list_item_category.xml

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/categories_checkbox"
    android:layout_width="fill_parent"
    android:layout_height="?android:attr/listPreferredItemHeight"
    android:checkMark="?android:attr/listChoiceIndicatorMultiple"
    android:gravity="center_vertical"
    android:onClick="toggle"
    android:paddingBottom="10dp"
    android:paddingLeft="10dp"
    android:paddingRight="12dp"
    android:paddingTop="10dp"
    android:text="sss" />
4

2 回答 2

2

我正在尝试根据 CheckAll 复选框的状态将 CheckedTextView 的状态设置为 Checked/Unchecked。但我无法使用 notifyDataSetChanged 相应地更新视图。

添加了带有问题代码的示例作为我的答案示例。它有效，可以在这里找到（看看它）。

此外，Android-Developer 的答案有效，因为每次用户检查/取消选中 all 时，您基本上都会使用具有正确状态的新项目重置适配器CheckBoxs。这可能是浪费的（但如果列表相对较小，则可以接受）。另请记住，如果对话框categoryName中的Category类发生更改，您需要确保Categories使用正确的名称构造新的（如果您不修改类别名称，那么这不是问题）当所有CheckBox被执行。

尝试这样的事情：

  1. 删除categoriesListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);如果它在您的代码中

  2. 像这样修改OnCheckedChangeListener检查CheckBox：

            @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {

            Toast.makeText(getActivity(), "Check", Toast.LENGTH_SHORT)
                    .show();

            Log.i("Nomad", "isChecked");
            for (int i = 0; i < adapter.getCount(); i++) {
                adapter.getItem(i).setChecked(isChecked);
                Log.i("Nomad", "isChecked " + i);
            }
            adapter.notifyDataSetChanged();
        }

  3. 像这样添加OnItemClickListener到您的categoriesListView ListView中：

                    @Override
                public void onItemClick(AdapterView<?> arg0, View arg1,
                        int arg2, long arg3) {
                    CategoriesListAdapter adapter = (CategoriesListAdapter) arg0
                            .getAdapter();
                    Category c = (Category) adapter.getItem(arg2);
                    c.setChecked(!c.getCheckStatus());
                    adapter.notifyDataSetChanged();
                }

  4. 和setChecked(boolean)（getCheckStatus()我看到你有一个isChecked方法Category可以用来获取布尔状态）是你的Category类中用于设置和获取该项目状态的方法

  5. 在getView()适配器的方法中，设置状态如下：

    holder.categoryName.setChecked(mCategories.get(position)
                .getCheckStatus());
于 2013-01-03T14:49:49.653 回答
2

因此，您正在尝试将所有项目设置为选中

setOnCheckedChangeListener

我认为。首先，如果你想让你的

adapter.notifyDataSetChanged();

要工作，您必须对您的内容进行编辑。您正在使用

List<Category> theCategories = new ArrayList<Category>();

要填充您的对话框并对其进行更新，您必须使用更改数据的相同对话框或创建一个新适配器。要在您的中使用相同的，setOnCheckedChangeListener您必须执行以下操作：

checkAll.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            if(isChecked){
              theCategories.clear();
              Toast.makeText(MainActivity.context, "Check", Toast.LENGTH_SHORT).show();
              for (int i = 0; i < categories.length; i++) {
                  Category pl = new Category(categories[i], true);
                  theCategories.add(pl);
              }
              adapter.notifyDataSetChanged();
           }

        }
    });

试试这个，如果它适合你，现在让我看看。:)

于 2013-01-05T11:35:37.233 回答