长按时突出显示自定义列表视图项 [英] Highlight custom listview item when long click
本文介绍了长按时突出显示自定义列表视图项的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我创建了一个自定义 listview，它的左侧有一个 ImageView，右侧有一个 TextView.并使用 actionbar 上下文菜单实现多选 Listview.
I have created a custom listview which has an ImageView on the left and a TextView on the right. And implementing a multi-selection Listview with actionbar context menu.
问题是，当我长按一个项目时，它没有突出显示.
The problem is, when i long click on an item it didn't gets highlighted.
这是我如何在我的 ListFragment
密码片段.java
package mohd.itcs.safewallet;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AbsListView.MultiChoiceModeListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListView;
public class PasswordsFragment extends ListFragment {
private String titles[] = { "item1", "item2", "item3" };
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new CustomPasswordsList(getActivity(), titles));
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
/*
* Setup Multiple Selection Mode
*/
getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
getListView().setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> listview, View item,
int position, long id) {
getListView().setItemChecked(position, true);
return true;
}
});
getListView().setMultiChoiceModeListener(new MultiChoiceModeListener() {
@Override
public boolean onActionItemClicked(ActionMode arg0, MenuItem arg1) {
// TODO Auto-generated method stub
return false;
}
/*
* Inflate Actionbar Menu for Passwords Multiple Selection
*/
@Override
public boolean onCreateActionMode(ActionMode arg0, Menu menu) {
getActivity().getMenuInflater().inflate(
R.menu.passwords_context_menu, menu);
return true;
}
@Override
public void onDestroyActionMode(ActionMode arg0) {
}
@Override
public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {
return false;
}
@Override
public void onItemCheckedStateChanged(ActionMode actionMode,
int position, long id, boolean arg3) {
/*
* Change Title bar to number of selection
*/
int checkedItems = getListView().getCheckedItemCount();
actionMode.setTitle(String.valueOf(checkedItems) + " Selected");
}
});
}
}
自定义密码列表.java
CustomPasswordsList.java
package mohd.itcs.safewallet;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomPasswordsList extends ArrayAdapter<String> {
private final Context context;
private final String values[];
public CustomPasswordsList(Context context, String[] values)
{
super(context, R.layout.password_list_item, values);
this.context = context;
this.values = values;
}
public View getView(int position, View convertView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.password_list_item, parent, false);
TextView passwordTitle = (TextView) rowView.findViewById(R.id.textView_passwordTitle);
ImageView passwordIcon = (ImageView) rowView.findViewById(R.id.imageView_passwordIcon);
passwordTitle.setText(values[position]);
passwordIcon.setImageResource(R.drawable.facebook);
return rowView;
}
}
passwords_list_item
passwords_list_item
<?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="match_parent"
android:weightSum="1"
android:orientation="horizontal" >
<ImageView
android:id="@+id/imageView_passwordIcon"
android:layout_height="60dp"
android:contentDescription="@string/imageView_passwordIcon"
android:layout_width="60dp" />
<TextView
android:id="@+id/textView_passwordTitle"
android:layout_height="wrap_content"
android:layout_width="0dp"
android:paddingLeft="10dp"
android:paddingTop="15dp"
android:textSize="16sp"
android:textColor="#000000"
android:layout_weight="1" />
</LinearLayout>
推荐答案
使用getActivity()就够了
setListAdapter(new CustomPasswordsList(getActivity(), titles));
您需要覆盖onItemCheckedStateChanged
public void onItemCheckedStateChanged(ActionMode mode,
int position, long id, boolean checked) {
final int checkedCount = getListView().getCheckedItemCount();
// get checked items count
从样本中抽取@
android-sdk-linux/samples/android-17/ApiDemos/src/com/example/android/apis/view/List16
示例:根据您的需要修改以下内容
Example : Modify the below according to your needs
public class MainActivity extends ListActivity {
String[] GENRES = new String[] {
"Action", "Adventure", "Animation", "Children", "Comedy",
"Documentary", "Drama",
"Foreign", "History", "Independent", "Romance", "Sci-Fi",
"Television", "Thriller"
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ListView lv = getListView();
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
lv.setMultiChoiceModeListener(new ModeCallback());
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_activated_1, GENRES));
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
getActionBar().setSubtitle("Long press to start selection");
}
private class ModeCallback implements ListView.MultiChoiceModeListener {
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.list_select_menu, menu);
mode.setTitle("Select Items");
return true;
}
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return true;
}
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.share:
Toast.makeText(MainActivity.this, "Shared " + getListView().getCheckedItemCount() +
" items", Toast.LENGTH_SHORT).show();
mode.finish();
break;
default:
Toast.makeText(MainActivity.this, "Clicked " + item.getTitle(),
Toast.LENGTH_SHORT).show();
break;
}
return true;
}
public void onDestroyActionMode(ActionMode mode) {
}
public void onItemCheckedStateChanged(ActionMode mode,
int position, long id, boolean checked) {
final int checkedCount = getListView().getCheckedItemCount();
switch (checkedCount) {
case 0:
mode.setSubtitle(null);
break;
case 1:
mode.setSubtitle("One item selected");
break;
default:
mode.setSubtitle("" + checkedCount + " items selected");
break;
}
}
}
}
list_select_menu.xml
list_select_menu.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/share"
android:title="share"
android:icon="@android:drawable/ic_menu_share"
android:showAsAction="always" />
</menu>
快照
因为您怀疑它是否适用于自定义适配器
Since you are doubting whether it would work with custom adapter
在 res/values-v11/styles.xml 下
under res/values-v11/styles.xml
<resources>
<style name="AppTheme" parent="android:Theme.Holo.Light"></style>
<style name="activated" parent="AppTheme">
<item name="android:background">?android:attr/activatedBackgroundIndicator</item>
</style>
</resources>
在根元素的自定义布局中添加
In the custom layout for the root element add
style="@style/activated"
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