在我的Android应用中，我正在通过光标检索手机通讯录。然后我想在数据库中添加所有这些联系人，如下所示：
public class SettingsActivity extends Activity {
ToggleButton tb_hide;
ToggleButton tb_unhide;
TextView tv_add_contacts;
TextView tv_restore_contacts;
DbManager manager;
Context context;
String[] privateContacts;
Uri queryUri;
String selectIds = "";
String ContactId[];
String ContactNames[];
String ContactNumbers[];
public static String[] wholContactData;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings_activity);
try{
context = this;
findView();
queryUri = ContactsContract.Contacts.CONTENT_URI;
//String selected_data = ContactsContract.Contacts.DISPLAY_NAME + " IS NOT NULL";
Cursor Cursor = getContentResolver().query
(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
privateContacts=showEvents(Cursor);
wholContactData=new String[privateContacts.length];
tv_add_contacts.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
addcontacts();
}
});
tv_restore_contacts.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
for(int i=0;i<privateContacts.length;i++){
selectIds = selectIds + " | " + privateContacts[i];
wholContactData[i]=privateContacts[i];
}
try{
addAllContacts(wholContactData);
}
catch(Exception ex)
{
Log.e("ERROR in adding all contacts", ex.toString());
}
Toast.makeText(getApplicationContext(),""+selectIds, 3000).show();
}});
}
catch(Exception ex){
Log.e("Add all contacts ERROR", ex.toString());
}
}
private void addAllContacts(final String[] selectedItems) {
try{
manager.open();
manager.Insert_phone_contact(selectedItems);
manager.close();
}
catch(Exception ex)
{
Log.e("ERROR", ex.toString());
}
}
protected String[] showEvents(Cursor cursor) {
ContactId= new String[cursor.getCount()];
ContactNames = new String[cursor.getCount()];
ContactNumbers = new String[cursor.getCount()];
int i=0;
while (cursor.moveToNext()) {
ContactId[i] = i+"";
ContactNames[i] = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
ContactNumbers[i] = Util.getContactNumber(ContactNames[i], context);
i++;
}
return ContactNames;
}
private void findView() {
TextView tv_hide = (TextView)findViewById(R.id.tv_hide);
TextView tv_hide_desc = (TextView)findViewById(R.id.tv_hide_desc);
tv_add_contacts = (TextView)findViewById(R.id.tv_add_contacts);
TextView tv_add_contacts_desc = (TextView)findViewById(R.id.tv_add_contacts_desc);
tv_restore_contacts = (TextView)findViewById(R.id.Tv_restore_contacts);
TextView tv_restore_contacts_desc = (TextView)findViewById(R.id.tv_restore_contacts_desc);
tb_hide = (ToggleButton)findViewById(R.id.tb_hide);
tb_hide.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
HideUnhideIcon();
}});
}
private void HideUnhideIcon() {
if(tb_hide.isChecked()){
PackageManager pm = getPackageManager();
ComponentName com_name = new ComponentName("com.android.discrete.main",
"com.android.discrete.main.SplashScreen");
pm.setComponentEnabledSetting(com_name,
PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
PackageManager.DONT_KILL_APP);
Toast.makeText(getApplicationContext(), "Your app is hidden now, Dial provided security code to get into discrete app.", 3000).show();
}
else if(tb_hide.isChecked()==false){
PackageManager pm = getPackageManager();
ComponentName com_name = new ComponentName("com.android.discrete.main",
"com.android.discrete.main.SplashScreen");
pm.setComponentEnabledSetting(com_name,
PackageManager.COMPONENT_ENABLED_STATE_ENABLED
,
PackageManager.DONT_KILL_APP );
}
}
private void addcontacts() {
final ProgressDialog myPd_ring=ProgressDialog.show(this, "Phone Contacts", "Loading please wait..", true);
myPd_ring.setCancelable(true);
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try
{
movetoPrivateContacts();
}catch(Exception e){}
myPd_ring.dismiss();
}
}).start();
}
private void moveToLogActivity() {
Intent i = new Intent(this, LogActivity.class);
startActivity(i);
finish();
}
private void movetoPrivateContacts() {
Intent intent = new Intent(this,privateContacts.class);
startActivity(intent);
}
@Override
public void onBackPressed() {
Intent i = new Intent(getApplicationContext(),MainActivity.class);
startActivity(i);
}
}
数据库代码如下：
public void Insert_phone_contact(String [] contact){
try{
SQLiteDatabase DB = this.getWritableDatabase();
ContentValues cv = new ContentValues();
for(int i=0;i<contact.length;i++){
// put all values in ContentValues
if (contact[i] !=null){
cv.put(CONTACT_NAME, ""+contact[i]);
DB.insert(TABLE_CONTACTS, null, cv);
}// insert in db
}
DB.close(); // call close
}
catch(Exception ex){
Log.e("Error in phone contact insertion", ex.toString());
}
}
我想在点击“tv_restore_contacts”时将所有联系人添加到数据库。但是我得到了NullPointerException。我不知道我哪里错了？
logcat错误堆栈为java.lang.NullPointerException。
答案 0 :(得分：1)
使用以下代码获取联系人＆amp;将它们返回到list数据类型以将它们整个列表保存在db中或在方法内部打开数据库连接，并对要存储的每个联系对象执行sql insert语句。 N / B不推荐使用Contacts API，请务必使用ContactsContract Api。
Private void getDetails(){
Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,null, null, null, null);
String[] projection = new String[] {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Phone.NUMBER };
Cursor names = getContentResolver().query(uri, projection, null, null, null);
int indexName = names.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
int indexNumber = names.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
names.moveToFirst();
do {
String name = names.getString(indexName);
Log.e("Name new:", name);
String number = names.getString(indexNumber);
Log.e("Number new:","::"+number);
} while (names.moveToNext());
}