【发布时间】：2013-12-20 08:16:38
【问题描述】：
我正在使用复选框显示联系人列表。我尝试实现自己的光标适配器，它是可检查的。但是，一旦我检查了该值，我希望将联系人存储在 ContactPerson 对象中。但是当我尝试它时显示空指针异常（这就是我注释掉该代码的原因）。我的 CursorAdapter 代码是这样的。
ContactListAcitivity.java
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.widget.CursorAdapter;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
public class ContactListActivity extends Activity {
ListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_list);
list = (ListView) findViewById(R.id.ListView2);
Cursor cur= getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null,null,null,null);
startManagingCursor(cur);
String[] result=new String[cur.getCount()];
for (boolean hasData = cur.moveToFirst(); hasData; hasData = cur.moveToNext())
{
ContactPerson contact = new ContactPerson(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)), String.valueOf(cur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));
}
stopManagingCursor(cur);
list.setAdapter(new contactAdapter(getApplicationContext(), cur));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.contact_list, menu);
return true;
}
private class ViewHolder{
TextView ContactName;
CheckBox contactCheck;
}
class contactAdapter extends CursorAdapter{
private Cursor cursor;
private Context ccontext;
private LayoutInflater inflater;
public contactAdapter(Context context, Cursor c) {
super(context, c);
// TODO Auto-generated constructor stub
cursor = c;
ccontext = context;
inflater = LayoutInflater.from(context);
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public void bindView(View view, Context arg1, Cursor arg2) {
// TODO Auto-generated method stub
ViewHolder holder = (ViewHolder) view.getTag();
if (holder == null) {
holder = new ViewHolder();
holder.ContactName = (TextView) view.findViewById(R.id.contact_name);
holder.contactCheck = (CheckBox) view.findViewById(R.id.contact_check);
view.setTag(holder);
holder.contactCheck.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
CheckBox cb = (CheckBox) v;
cb.setSelected(true);
// ContactPerson contact = (ContactPerson) cb.getTag(); this is the place where it is showing null pointer exception
// Log.i("clicked users", contact.getName());
// contact.setSelected(true);
}
});
}else{
holder = (ViewHolder) view.getTag();
}
// ContactPerson contacts = contactList.get(position);
holder.ContactName.setText(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));
// holder.contactCheck.setChecked(contacts.isSelected());
// holder.contactCheck.setTag(contacts);
// holder.ContactName.setText(contacts.getName());
}
@Override
public View newView(Context arg0, Cursor arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.checkbox_item, arg2, false);
}
}
}
activity_contact_list.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000">
<ListView
android:id="@+id/ListView2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".GroupContactsActivity"
android:layout_alignParentTop="true"
/>
<Button
android:id="@+id/selected_done_1"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:textColor="#FFFFFF"
android:text="Done" />
</RelativeLayout>
checkbox_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="6dip"
android:background="#000000">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/contact_name"
android:layout_alignParentLeft="true"
android:text="textview"
android:textSize="15sp"
android:textColor="#FFFFFF"
android:gravity="center_horizontal"/>
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:id="@+id/contact_check"/>
</RelativeLayout>
谁能建议我如何在此适配器中使用该联系人类。
public class ContactPerson {
String name= null, number = null;
boolean Selected = false;
public ContactPerson(String PersonName, String PhoneNumber){
this.name = PersonName;
this.number= PhoneNumber;
}
public String getName(){
return name;
}
public boolean isSelected(){
return Selected;
}
public void setSelected(boolean selected){
this.Selected = selected;
}
public String getPhoneNumber(){
return number;
}
}
【问题讨论】：
-
cb.setselected(true) 这里需要吗？？
-
给我看看你的两个 xml 文件还有这个文件的完整代码..
-
@Segi：请检查代码。我之前没有放，因为有些人会因为显示不必要的代码而给负面标记。
-
好的。等等，我只是检查一下。
-
检查我的以下答案。它现在工作正常..
标签： android android-contentprovider android-cursoradapter