安卓程序空指向异常

王德升

我的程序是获得手机的通讯录，为什么会出现空指向异常？

package imut.chenying;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class AddContract extends Activity {
private String name;
private String number;
ListView lv;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.contract);
lv = (ListView) findViewById(R.id.addcontracts);
List<AddContract> contracts = readContacts();
Show(contracts,lv);
}
public void Show(List<AddContract> contracts,ListView lv){
ArrayList<Map<String, Object>> al = new ArrayList<Map<String, Object>>();
for (int i = 0; i < contracts.size(); i++) {
Map<String, Object> person = new HashMap<String, Object>();
AddContract c = contracts.get(i);
person.put("name", c.getName());
person.put("phonenumber", c.getNumber());
person.put("pic", R.drawable.ic_launcher);
al.add(person);
}
SimpleAdapter sa = new SimpleAdapter(AddContract.this, al, R.layout.item,
new String[] { "name", "phonenumber", "pic" }, new int[] {
R.id.name, R.id.pnumber, R.id.pic });
lv.setAdapter(sa);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View arg1,
int position, long id) {
// TODO Auto-generated method stub
ListView listView = (ListView) parent;
HashMap<String, Object> itemAtPosition = (HashMap<String, Object>) listView
.getItemAtPosition(position);
HashMap<String, Object> map = itemAtPosition;
//String contactName = (String) map.get("name");
String contactNumber = (String) map.get("phonenumber");
Intent intent = new Intent();
intent.setAction(Intent.ACTION_CALL);// 动作
Uri uri = Uri.parse("tel:" + contactNumber);//
intent.setData(uri);
startActivity(intent);
}
});
}
public List<AddContract> readContacts() {
List<AddContract> contracts = new ArrayList<AddContract>();
Cursor cursor = getContentResolver().query(
ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
// Contacts：这个好像是通讯录里面的一个人的基本描述，像什么显示的名字
while (cursor.moveToNext()) {
HashMap<String, Object> map = new HashMap<String, Object>();
String phoneName = cursor.getString(cursor
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
System.out.println(phoneName);
map.put("ItemTitle", phoneName);// 电话姓名
String contactId = cursor.getString(cursor
.getColumnIndex(ContactsContract.Contacts._ID));
System.out.println(contactId);
// 返回结果是String类型，1表示有，0表是没
String hasPhone = cursor
.getString(cursor
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));
System.out.println(hasPhone);
if (hasPhone.compareTo("1") == 0) {// 如果有电话，根据联系人的ID查找到联系人的电话，电话可以是多个
Cursor phones = getContentResolver().query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID
+ " = " + contactId, null, null);
while (phones.moveToNext()) {
AddContract c = new AddContract();
c.name = phoneName;
String phoneNumber = phones
.getString(phones
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
String phoneTpye = phones
.getString(phones
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE));
map.put("ItemText", phoneNumber); // 多个号码如何处理
c.number = phoneNumber;
contracts.add(c);
}
phones.close();
} else {
AddContract c = new AddContract();
c.name = phoneName;
c.number = "";
contracts.add(c);
}
}
return contracts;
}
}

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下面是ListView的XML文件

<?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" >
<ListView
android:id="@+id/addcontracts"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>

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还有item的XML文件

<?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:orientation="vertical"
android:descendantFocusability="blocksDescendants" >
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/pic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/pic"
android:text="姓名"
android:textSize="20sp" />
<TextView
android:id="@+id/pnumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/name"
android:layout_alignParentRight="true"
android:text="号码" />
</RelativeLayout>
</LinearLayout>

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安卓程序空指向异常

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安卓程序空指向异常