可勾选列表视图光标数据的独立复选框 [英] Checkable listview cursor-data independent checkbox
问题描述
我的任务是创建的在的ListView根据 ListActivity 。数据内容来自数据库 SimpleCursorAdapter 。
My task is to create a ListView based on ListActivity. The data content comes from a database SimpleCursorAdapter.
从光标列的独立IT在每个列表项显示一个复选框。用户应检查尽可能多的行，因为他想要的。当用户完成了他的选择，我必须得到所有选中的行，它的_id列，所以我必须知道被检查的行。
Independent from cursor columns it have to show a CheckBox in each listitem. The user should check as many rows as he want. When the user finished his selection, I have to get all of checked rows and it's _id columns, so I have to know which rows were checked.
怎么办呢？
没有的CheckBox 的列表视图功能已正常工作。
Without CheckBoxes the Listview functionality already works fine.
推荐答案
一种快捷方法是使用 android.R.layout.simple_list_item_multiple_choice 。这code例如你想要做什么（只要注意，我用我的光标联系人）：
One quick way would be to use android.R.layout.simple_list_item_multiple_choice. This code example does what you want (just note that I used Contacts for my Cursor):
public class ListCheck extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_check);
this.getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
Cursor cursor = managedQuery(ContactsContract.Contacts.CONTENT_URI,
null, null, null, null);
startManagingCursor(cursor);
String[] columns = new String[] { ContactsContract.Contacts.DISPLAY_NAME };
int[] to = new int[] { android.R.id.text1 };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_multiple_choice, cursor, columns, to);
this.setListAdapter(adapter);
Button finishButton = (Button) this.findViewById(R.id.finishButton);
finishButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
SimpleCursorAdapter adapter = (SimpleCursorAdapter) ListCheck.this.getListAdapter();
Cursor cursor = adapter.getCursor();
ListView lv = ListCheck.this.getListView();
SparseBooleanArray selectedItems = lv.getCheckedItemPositions();
for (int i = 0; i < selectedItems.size(); i++) {
int selectedPosition = selectedItems.keyAt(i);
cursor.moveToPosition(selectedPosition);
Log.d("", cursor.getString(cursor.getColumnIndex(
ContactsContract.Contacts.DISPLAY_NAME))+" is checked");
Log.d("", "row id: "+adapter.getItemId(selectedPosition));
}
}
});
}
}
活动的布局：
<?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"
android:orientation="vertical" >
<Button
android:id="@+id/finishButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:choiceMode="multipleChoice" />
</LinearLayout>
不过，如果你想添加的每一行（图像，字幕..）内的其他自定义数据，那么你必须创建使用的 CheckedTextView 。 CheckedTextView 是真正的关键在这里，因为它使用的<一个href=\"https://github.com/android/platform_frameworks_base/blob/master/core/res/res/layout/simple_list_item_multiple_choice.xml\"相对=nofollow> android.R.layout.simple_list_item_multiple_choice 。
However, if you want to add other custom data inside each row (image, subtitle..), then you have to create a custom layout for your rows using CheckedTextView. CheckedTextView is really the key here, since it's used by the android.R.layout.simple_list_item_multiple_choice.
只要按照这个例子：
<com.mfp.tests.CheckableLinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<CheckedTextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:checkMark="?android:attr/listChoiceIndicatorMultiple"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="added a data: subtitle"/>
</com.mfp.tests.CheckableLinearLayout>
最后一件事：我使用了一个自定义布局，而不是的LinearLayout 。
为了使 CheckedTextView 响应（自动检查，或当你点击一排没有），布局必须实施可勾选（与LinearLayout中没有），所以你必须在 CheckableLinearLayout 类从这个复制的链接：
One last thing: I used a custom layout instead of a LinearLayout.
In order to make the checkBox of CheckedTextView responsive (automatically checked or unchecked when you click on a row), the layout must implement Checkable (and LinearLayout doesn't), so you'll have to copy the CheckableLinearLayout class from this link:
PS：如果你想尝试上述code，不要忘了把＆LT;使用许可权的android：NAME =android.permission.READ_CONTACTS/＆GT; 您的Manifest.xml在
PS: If you want to try the code above, don't forget to put <uses-permission android:name="android.permission.READ_CONTACTS" /> inside your Manifest.xml
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