Question

请帮助我找到一个解决方案，当我点击菜单项＆＃34时，如何设置我的复选框可见;删除＆＃34;当我按下＆＃34;确认＆＃34;并设置为不可见或＆＃34;取消＆＃34;。我使用SimpleCursorAdapter，cuz listview是从带有游标加载器的数据库中填充的... 这是我的代码：

MainActivity

public class MainActivity extends ActionBarActivity implements LoaderManager.LoaderCallbacks<Cursor>{

    final String LOG = "phonebookLogs";

    private static final int LOADER_ID = 1;

    Intent intentAddContact;
    ListView lvMain;
    CheckBox cbxList;
    MenuItem addContact, deleteContact, settings, expimp, confirmDelete, cancelDelete;

    DB mDB;
    SimpleCursorAdapter scAdapter;  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //find ListView
        lvMain = (ListView)findViewById(R.id.lvMain);

        //calling for creating adapter
        onCreateAdapter();

    }

    public void onCreateAdapter(){

        String[] from = new String[] { DB.COL_LINK, DB.COL_SURNAME, DB.COL_NAME };
        int[] to = new int[] { R.id.ivPhoto, R.id.tvSurname, R.id.tvName, };
        if(to[0] == 0){
            to[0] = R.drawable.default_contact;
        }

        scAdapter = new SimpleCursorAdapter(this, R.layout.item, null, from, to, 0);
        lvMain.setAdapter(scAdapter);

        // loader for reading data
        getSupportLoaderManager().initLoader(LOADER_ID, null, this);
    }   

    public void deleteRecord(){
        //when MenuItem "Delete" is clicked
        addContact.setVisible(false);
        deleteContact.setVisible(false);
        settings.setVisible(false);
        expimp.setVisible(false);
        confirmDelete.setVisible(true);
        cancelDelete.setVisible(true);

    }

    public void onCancelDeleteRecord(){
        ////when MenuItem "cancel" is clicked
        addContact.setVisible(true);
        deleteContact.setVisible(true);
        settings.setVisible(true);
        expimp.setVisible(true);
        confirmDelete.setVisible(false);
        cancelDelete.setVisible(false);

    }

    public void confirmDeleteRecord(){
        ////when MenuItem "confirm" is clicked
        addContact.setVisible(true);
        deleteContact.setVisible(true);
        settings.setVisible(true);
        expimp.setVisible(true);
        confirmDelete.setVisible(false);
        cancelDelete.setVisible(false);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu)
    {
        //find all MenuItems
        addContact = menu.findItem(R.id.addContact);
        deleteContact = menu.findItem(R.id.deleteContact);
        settings = menu.findItem(R.id.settings);
        expimp = menu.findItem(R.id.expimp);
        confirmDelete = menu.findItem(R.id.confirmDelete);
        cancelDelete = menu.findItem(R.id.cancelDelete);    

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item){
        switch(item.getItemId()){
        case R.id.addContact:
            intentAddContact = new Intent(this, NewContact.class);
            startActivity(intentAddContact);
            break;
        case R.id.deleteContact:
            deleteRecord();
            break;
        case R.id.settings:

            break;
        case R.id.expimp:

            break;
        case R.id.confirmDelete:
            confirmDeleteRecord();
            break;
        case R.id.cancelDelete:
            onCancelDeleteRecord();
            break;
        default:
            break;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle bndl) {
        return new MyCursorLoader(this, mDB);
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
        scAdapter.swapCursor(cursor);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        scAdapter.swapCursor(null);
    }

}

DB.class和CursorLoader.class很好，简单的查询和加载。和我的ListView的XML文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="@dimen/margin"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/margin"
        android:layout_weight="0.5"
        android:orientation="horizontal" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/margin"
            android:orientation="vertical" >

            <ImageView
                android:id="@+id/ivPhoto"
                android:layout_width="@dimen/imageWidth"
                android:layout_height="@dimen/imageHeight"
                android:layout_gravity="center_vertical"
                android:contentDescription="@string/photoDescription"
                android:src="@drawable/default_contact" />
        </LinearLayout>

        <TextView
            android:id="@+id/tvName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="@dimen/margin"
            android:text=""
            android:textSize="@dimen/textSize" />

        <TextView
            android:id="@+id/tvSurname"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="@dimen/margin"
            android:text=""
            android:textSize="@dimen/textSize" />
    </LinearLayout>

    <CheckBox
        android:id="@+id/cbxList"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="@dimen/margin"
        android:layout_weight="0.2"
        android:visibility="invisible" />

</LinearLayout>

我已经阅读了很多内容，但如何在不创建自己的适配器的情况下实现它仍然无法获得...... 非常感谢任何寻求解决方案的帮助！

Answer 1

您可以将复选框设置为可见：cbxlist.setVisibility(View.VISIBLE);

如果您希望它完全消失，请使用（即让它看起来好像从未添加过）：cbxlist.setVisibility(View.GONE);

如果您希望它只是隐身，但仍然占据相同的空间：cbxlist.setVisibility(View.INVISIBLE);

编辑：

for(int i = 0; i < lvMain.getChildCount(); i++) {

      lvMain.getChildAt(i).findViewById(R.id.cbxList).setVisibility(View.VISIBLE);

}

这应该将所有复选框设置为可见。同样，在需要时请求View.INVISIBLE。

Answer 2

如果要更改列表视图中每个复选框的可见性（假设您的XML是列表行视图），则需要创建自定义适配器并覆盖getView方法。

在那里，您将执行以下操作：

@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
    cBox = (CheckBox ) convertView.findViewById(R.id.cbxList);
    cBox.setVisibility(View.GONE);
    return convertView;
}

ListView中的CheckBox，使用SimpleCursorAdapter和CursorLoader的setVisibility

2 个答案: