这是我在android中检索手机通讯录的代码。加载联系人时，应用程序需要花费大量时间。我使用嵌套循环需要花费很多时间，告诉我更好的方法来实现相同的目标。
@Override
protected Cursor doInBackground(Void... params) {
Uri contactsUri = ContactsContract.Contacts.CONTENT_URI;
// Querying the table ContactsContract.Contacts to retrieve all the contacts
Cursor contactsCursor = getContentResolver().query(contactsUri, null, null, null,
ContactsContract.Contacts.DISPLAY_NAME + " ASC ");
if(contactsCursor.moveToFirst()){
do{
long contactId = contactsCursor.getLong(contactsCursor.getColumnIndex("_ID"));
Uri dataUri = ContactsContract.Data.CONTENT_URI;
// Querying the table ContactsContract.Data to retrieve individual items like
// home phone, mobile phone, work email etc corresponding to each contact
Cursor dataCursor = getContentResolver().query(dataUri, null,
ContactsContract.Data.CONTACT_ID + "=" + contactId,
null, null);
String displayName="";
String nickName="";
String homePhone="";
String mobilePhone="";
String workPhone="";
String photoPath="" + R.drawable.blank;
byte[] photoByte=null;
String homeEmail="";
String workEmail="";
String companyName="";
String title="";
if(dataCursor.moveToFirst()){
// Getting Display Name
displayName = dataCursor.getString(dataCursor.getColumnIndex(ContactsContract.Data.DISPLAY_NAME ));
do{
// Getting NickName
if(dataCursor.getString(dataCursor.getColumnIndex("mimetype")).equals(ContactsContract.CommonDataKinds.Nickname.CONTENT_ITEM_TYPE))
nickName = dataCursor.getString(dataCursor.getColumnIndex("data1"));
// Getting Phone numbers
if(dataCursor.getString(dataCursor.getColumnIndex("mimetype")).equals(ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE)){
switch(dataCursor.getInt(dataCursor.getColumnIndex("data2"))){
case ContactsContract.CommonDataKinds.Phone.TYPE_HOME :
homePhone = dataCursor.getString(dataCursor.getColumnIndex("data1"));
break;
case ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE :
mobilePhone = dataCursor.getString(dataCursor.getColumnIndex("data1"));
break;
case ContactsContract.CommonDataKinds.Phone.TYPE_WORK :
workPhone = dataCursor.getString(dataCursor.getColumnIndex("data1"));
break;
}
}
// Getting EMails
if(dataCursor.getString(dataCursor.getColumnIndex("mimetype")).equals(ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE ) ) {
switch(dataCursor.getInt(dataCursor.getColumnIndex("data2"))){
case ContactsContract.CommonDataKinds.Email.TYPE_HOME :
homeEmail = dataCursor.getString(dataCursor.getColumnIndex("data1"));
break;
case ContactsContract.CommonDataKinds.Email.TYPE_WORK :
workEmail = dataCursor.getString(dataCursor.getColumnIndex("data1"));
break;
}
}
// Getting Organization details
if(dataCursor.getString(dataCursor.getColumnIndex("mimetype")).equals(ContactsContract.CommonDataKinds.Organization.CONTENT_ITEM_TYPE)){
companyName = dataCursor.getString(dataCursor.getColumnIndex("data1"));
title = dataCursor.getString(dataCursor.getColumnIndex("data4"));
}
// Getting Photo
if(dataCursor.getString(dataCursor.getColumnIndex("mimetype")).equals(ContactsContract.CommonDataKinds.Photo.CONTENT_ITEM_TYPE)){
photoByte = dataCursor.getBlob(dataCursor.getColumnIndex("data15"));
if(photoByte != null) {
Bitmap bitmap = BitmapFactory.decodeByteArray(photoByte, 0, photoByte.length);
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the contact image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+contactId+".png");
// The FileOutputStream to the temporary file
try {
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Writing the bitmap to the temporary file as png file
bitmap.compress(Bitmap.CompressFormat.PNG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
} catch (Exception e) {
e.printStackTrace();
}
photoPath = tmpFile.getPath();
}
}
}while(dataCursor.moveToNext());
String details = "";
// Concatenating various information to single string
if(homePhone != null && !homePhone.equals("") )
details = "HomePhone : " + homePhone + "\n";
if(mobilePhone != null && !mobilePhone.equals("") )
details += "MobilePhone : " + mobilePhone + "\n";
if(workPhone != null && !workPhone.equals("") )
details += "WorkPhone : " + workPhone + "\n";
if(nickName != null && !nickName.equals("") )
details += "NickName : " + nickName + "\n";
if(homeEmail != null && !homeEmail.equals("") )
details += "HomeEmail : " + homeEmail + "\n";
if(workEmail != null && !workEmail.equals("") )
details += "WorkEmail : " + workEmail + "\n";
if(companyName != null && !companyName.equals("") )
details += "CompanyName : " + companyName + "\n";
if(title != null && !title.equals("") )
details += "Title : " + title + "\n";
// Adding id, display name, path to photo and other details to cursor
mMatrixCursor.addRow(new Object[]{ Long.toString(contactId),displayName,photoPath,details});
}
}while(contactsCursor.moveToNext());
}
return mMatrixCursor;
}
答案 0 :(得分：0)
我有同样的问题，我已经通过使用 ContactsContract.CommonDataKinds.Phone 类来解决。
这是我的联系功能。你可以尝试
public void fetchContacts2() {
contactArrayList = new ArrayList<>();
try {
Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
Cursor cursor = context.getContentResolver().query(uri,
new String[] {ContactsContract.CommonDataKinds.Phone.NUMBER,
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Phone._ID,
ContactsContract.CommonDataKinds.Phone.HAS_PHONE_NUMBER},
null,
null,
null);
Map<String,contact> contactMap = new HashMap<>();
if (cursor.getCount() > 0) {
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
String contact_id = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone._ID));
String basename = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String name = null;
if (basename != null) {
try {
name = new String(basename.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
long hasPhoneNumber = Long.parseLong(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.HAS_PHONE_NUMBER)));
if (hasPhoneNumber > 0) {
String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
if (name != null && number != null && ! contactMap.containsKey(number)) {
contact c = new contact(context);
c.contactid = contact_id;
c.name = name;
c.phonenr = number;
c.setsearchphone();
c.email = "";
contactMap.put(number,c);
}
}
cursor.moveToNext();
}
cursor.close();
if (contactMap != null){
contactArrayList.addAll(contactMap.values());
}
} else {
// Toast.makeText(context, "No contacts Found", Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
e.printStackTrace();
Log.v("Contacts", "getin " + e.getMessage());
}
Log.v("Contacts", "finished getting contacts in mem");
}