如何链接填充列表视图中每个联系人的复选框? [英] How do I link a checkbox for every contact in populated listview?
问题描述
我在这个问题上遇到了很多麻烦.我有一个包含以下内容的列表视图:
I've been having a lot of trouble with this problem. I have a listview that contains:
ImageView/contactName/TextView/CheckBox
列表视图中的contactName 是通过从SimpleCursorAdapter 读取手机上的联系人来填充的.当应用程序运行时，所有元素都会显示，但我遇到的问题是将复选框连接到列表中的相应项目.
The contactName in the listview is populated by reading the contacts on the phone from a SimpleCursorAdapter. All for elements show when the app runs, but the problem I'm having is connecting the checkboxes to their corresponding item in the list.
通过一些研究，我发现我必须使用 getView() 将复选框与列表中的项目链接起来，但通过实践，我似乎无法让它正常工作.此外，我尝试过的示例都没有真正解释如何应用 getView().我一直在使用的最完整的例子来自这里:
Through some research, I found that I must use a getView() to link the checkboxes with the items in the list, but through practice, I can't seem to get it to work right. Furthermore, none of the examples I've tried really explained how to apply getView(). The most full example I've been working from is from here:
http://androidcocktail.blogspot.com/2012/04/adding-checkboxes-to-custom-listview-in.html
扭曲的是，这会读取并使用我的联系人填充我的列表视图:
The twist is that this reads and populates my listview with my contacts:
private void populateContactList() {
// Build adapter with contact entries
Cursor cursor = getContacts();
String[] fields = new String[] {
ContactsContract.Data.DISPLAY_NAME
};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.contact_entry, cursor,
fields, new int[] {R.id.contactEntryText});
lv.setAdapter(adapter);
} // END POPULATECONTACTLIST
private Cursor getContacts()
{
// Run query
Uri uri = ContactsContract.Contacts.CONTENT_URI;
String[] projection = new String[] {
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME
};
String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" +
(chkboxAllVisible ? "0" : "1") + "'";
String[] selectionArgs = null;
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC";
return managedQuery(uri, projection, selection, selectionArgs, sortOrder);
} // END GETCONTACTS
如何将每个复选框链接到列表视图中相应的联系人项目?
推荐答案
好的，我已经为您创建了一个测试项目，您可以尝试理解代码，如果您遇到任何问题，请询问我会尽力帮助您...
Ok i have created a test project for you try to understand code if any problem you are having then ask I will try to help you...
这是我创建的活动功能.
HERE IS MY ONCREATE FUNCTION OF ACTIVITY.
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayList<String> elements = new ArrayList<String>();
for (int i = 0; i < 10; i++) {
elements.add("elements " + i);
}
CheckBox master_cb = new CheckBox(getApplicationContext());
master_cb.setText("Check All");
//HERE IS THE LIST VIEW WHICH I HAVE CREATED IN MY XML FILE.
ListView lv = (ListView) findViewById(R.id.listView1);
//HERE I AM CREATING CUSTOM ADAPTER OBJECT.
my_custom_adapter adapter = new my_custom_adapter(this, android.R.layout.simple_list_item_1, elements);
lv.addHeaderView(master_cb);
lv.setAdapter(adapter);
master_cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Intent my_intent = new Intent("master_check_change");
my_intent.putExtra("check_value", isChecked);
sendBroadcast(my_intent);
}
});
}
这是我的定制适配器.
public class my_custom_adapter extends ArrayAdapter<String> {
private Context context = null;
ArrayList<String> elements = null;
private ArrayList<Boolean> itemChecked = null;
public my_custom_adapter(Context context, int type, ArrayList<String> elements)
{
super(context, type, elements);
this.elements = elements;
this.context = context;
itemChecked = new ArrayList<Boolean>();
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("master_check_change")) {
boolean check_value = intent.getBooleanExtra("check_value", false);
set_checked(check_value);
notifyDataSetChanged();
}
}
};
context.registerReceiver(receiver, new IntentFilter("master_check_change"));
set_checked(false);
}
// AS EVERY TIME LISTVIEW INFLATE YOUR VIEWS WHEN YOU MOVE THEM SO YOU NEED TO SAVE ALL OF YOUR CHECKBOX STATES IN SOME ARRAYLIST OTHERWISE IT WILL SET ANY DEFAULT VALUE.
private void set_checked(boolean is_checked)
{
for (int i=0; i < elements.size(); i++) {
itemChecked.add(i, is_checked);
}
}
//THIS IS SIMPLY A CLASS VIEW WILL HOLD DIFFERENT VIEWS OF YOUR ROW.
static class ViewHolder
{
public TextView tv;
public CheckBox cb;
public ImageView iv;
}
@Override
public View getView (final int position, View convertView, ViewGroup parent)
{
View rowView = convertView;
ViewHolder holder = null;
if (rowView == null) {
LayoutInflater inflater = (LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
// HERE I AM INFLATING LISTVIEW LAYOUT.
rowView = inflater.inflate(R.layout.inflated_layout, null, false);
holder = new ViewHolder();
holder.cb = (CheckBox) rowView.findViewById(R.id.checkBox1);
holder.tv = (TextView) rowView.findViewById(R.id.textView1);
holder.iv = (ImageView) rowView.findViewById(R.id.imageView1);
rowView.setTag(holder);
} else {
holder = (ViewHolder) rowView.getTag();
}
if (holder != null) {
holder.tv.setText(elements.get(position));
holder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
itemChecked.set(position, isChecked);
}
});
if(position < itemChecked.size()) {
holder.cb.setChecked(itemChecked.get(position));
}
}
return rowView;
}
}
main.xml 文件是这样的:
main.xml file is this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
inflated_layout 代码是:
inflated_layout code is :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="17dp" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="@+id/checkBox1"
android:layout_toRightOf="@+id/imageView1"
android:singleLine="true"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
如果你想使用字符串数组而不是数组列表则替换
if you want to use string array instead of arraylist then replace
String[] elements = new String[10];
for (int i = 0; i < 10; i++) {
elements[i] = "elements " + i;
}
//在您的自定义适配器设计器中
// IN YOUR CUSTOM ADAPTER CUNSTRUCTOR
public my_custom_adapter(Context context, int type, String[] elements)
还有一些相应的变化
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