问题
I have modified this example from the SDK pages to grab all the Contact Groups from the phone and display them. I cannot, however, figure out how to click one of them and then use the Groups._ID to do something else. Can someone teach me how to get a click/select listener on this list?
MyListAdapter.java
package com.example.simplelist;
import android.app.ListActivity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Contacts.Groups;
import android.widget.ListAdapter;
import android.widget.SimpleCursorAdapter;
public class MyListAdapter extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_list_activity_view);
Cursor mCursor = this.getContentResolver().query(Groups.CONTENT_URI, null, null, null, null);
startManagingCursor(mCursor);
ListAdapter adapter = new SimpleCursorAdapter(this, android.R.layout.two_line_list_item, mCursor, new String[] {Groups.NAME, Groups._ID}, new int[] {android.R.id.text1, android.R.id.text2});
setListAdapter(adapter);
}
}
custom_list_activity_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="8dp"
android:paddingRight="8dp">
<ListView android:id="@id/android:list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#00FF00"
android:layout_weight="1"
android:drawSelectorOnTop="false" android:choiceMode="singleChoice" android:clickable="true" />
<TextView android:id="@id/android:empty"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FF0000"
android:text="No data"/>
</LinearLayout>
two_line_list_item.xml
<?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="wrap_content"
android:orientation="vertical">
<TextView android:id="@+id/text1"
android:textSize="16sp"
android:textStyle="bold"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/text2"
android:textSize="16sp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.simplelist"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="3" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".MyListAdapter"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.READ_CONTACTS" />
</manifest>
回答1:
This should allow you to interact with selected item the way you want.
MyListAdapter.java
package com.example.simplelist;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.app.ListActivity;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Contacts.Groups;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class MyListAdapter extends ListActivity {
List<ContactGroup> groups = new ArrayList<ContactGroup>();
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.groups = getContacts();
ContactGroupAdapter cAdapter = new ContactGroupAdapter(this);
setListAdapter(cAdapter);
}
private List<ContactGroup> getContacts(){
List<ContactGroup> grps = new ArrayList<ContactGroup>();
ContentResolver cr = getContentResolver();
Cursor groupCur = cr.query(Groups.CONTENT_URI, null, null, null, null);
if (groupCur.getCount() > 0) {
while (groupCur.moveToNext()) {
ContactGroup newGroup = new ContactGroup();
newGroup.Id = groupCur.getString(groupCur.getColumnIndex(Groups._ID));
newGroup.Name = groupCur.getString(groupCur.getColumnIndex(Groups.NAME));
grps.add(newGroup);
}
}
return grps;
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
ContactGroup selectedGroup = new ContactGroup();
selectedGroup = groups.get(position);
Toast.makeText(getBaseContext(), selectedGroup.Name + " ID #" + selectedGroup.Id, 1).show();
}
public class ContactGroupAdapter extends BaseAdapter{
public ContactGroupAdapter(Context c) {
mContext = c;
}
@Override
public int getCount() {
return groups.size();
}
@Override
public Object getItem(int position) {
return 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 vi = LayoutInflater.from(this.mContext);
convertView = vi.inflate(R.layout.two_line_list_item, null);
holder = new ViewHolder();
convertView.setTag(holder);
}
else {
//Get view holder back
holder = (ViewHolder) convertView.getTag();
}
ContactGroup c = groups.get(position);
if (c != null) {
//Name
holder.toptext = (TextView) convertView.findViewById(R.id.text1);
holder.toptext.setText(c.Name);
//ID
holder.bottomtext = (TextView) convertView.findViewById(R.id.text2);
holder.bottomtext.setText(c.Id);
}
return convertView;
}
private Context mContext;
}
public static class ViewHolder {
TextView toptext;
TextView bottomtext;
}
public class ContactGroup{
public String Id;
public String Name;
}
}
two_line_list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01" android:layout_width="fill_parent"
android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:id="@+id/text1"
android:textSize="16sp"
android:textStyle="bold"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/text2"
android:textSize="16sp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
回答2:
Since you are using ListActivity you need to override onListItemClick().
protected void onListItemClick(ListView l, View v, int position, long id) {
// position is the position in the adapter and id is what adapter.getItemId() returns.
// use one of them to get the group id from the data.
}
来源：https://stackoverflow.com/questions/5170794/click-listener-on-listview