android:高效查询短信唯一显示名称
我正在尝试编写一个活动来显示短信对话中演变的联系人的显示名称。
不幸的是:
SMS 数据库不包含 DisplayName
所以我使用了一个使用地址“电话号码”来获取 DisplayName 的函数
我不知道如何从 SMS 数据库查询唯一地址
所以我使用排序查询,使用循环查找唯一的 DisplayName,然后将它们放入数组中
如果没有,是否最好运行这个过程在后台进行?可是名单还没准备好,活动怎么开始呢?!
最后,我在 ArrayAdapter 中使用这个数组来填充我的 ListView(几乎是在尝试模仿本机消息应用程序)
结果,该活动需要很长时间才能打开(大约 2-3 秒) ,而且我没有太多消息)
有没有办法有效地解决我的任何或两个问题?
这是我的代码
public class MessagesPicker extends Activity {
Cursor myCursor;
ListView pickerListView;
public static final String MessageAddress = address;
public static final String MessageID = _id;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.picker);
ContentResolver cr = getContentResolver();
myCursor = cr.query(Uri.parse(contentsms), null, null, null, MessageAddress + ASC); //getting sorted data to easy finding uniqueness
/**setting up unique DisplayNames array**/
int allCount = myCursor.getCount(), uniqueCount = 0;
String[] uniqueNames = new String[allCount];
String temp1,temp2;
myCursor.moveToFirst();
temp1 = getContactDiplayNameByAddr();
uniqueNames[uniqueCount++] = temp1;
do {
temp2 = getContactDiplayNameByAddr();
if (temp1.compareTo(temp2) != 0){
uniqueNames[uniqueCount++] = temp2;
temp1 = temp2;
}
}while(myCursor.moveToNext());
String [] valuesArray = new String[uniqueCount]; //filling the array
for (int i = 0 ; i uniqueCount ; i++)
valuesArray[i] = uniqueNames[i];
/**setting up the ListView**/
ArrayAdapterString adapter = new ArrayAdapterString(this, android.R.layout.simple_list_item_multiple_choice, valuesArray);
pickerListView = (ListView)findViewById(R.id.PickerLV); //linking the object to the interface
pickerListView.setAdapter(adapter); //setting the adapter
pickerListView.setItemsCanFocus(false); //allowing to check the checkbox
pickerListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); //allowing multiple choices
}
String getContactDiplayNameByAddr() { //this function returns DisplayName, or if not available, returns the address
String Address = myCursor.getString(myCursor.getColumnIndex(address));
Uri personUri = Uri.withAppendedPath( ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Address);
Cursor cur = getContentResolver().query(personUri,
new String[] {PhoneLookup.DISPLAY_NAME},
null, null, null );
if( cur.moveToFirst() ) {
String DisplayName = cur.getString(cur.getColumnIndex(PhoneLookup.DISPLAY_NAME));
cur.close();
return DisplayName;
}
return Address;
}
}
I'm trying to write an activity that shows the DisplayNames of contacts evolved in SMS conversations.
Unfortunately:
The SMS database doesn't contain the DisplayName
so I used a function that uses the address "phone number" to get the DisplayName
I don't know how to query unique addresses from the SMS database
so I used sorted query, used a loop to find unique DisplayNames, and then put them in an array
If not, is it better to run this process in the background? but how will the activity open if the list is not prepared yet?!
Finally, I used this array in an ArrayAdapter to populate my ListView (pretty much trying to mimic the native Messaging app)
The activity turned out to take a lot of time to open up (around 2-3 seconds, and I don't have much messages)
Is there a way to solve any or both of my problems efficiently?
Here's my code
public class MessagesPicker extends Activity {
Cursor myCursor;
ListView pickerListView;
public static final String MessageAddress = address;
public static final String MessageID = _id;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.picker);
ContentResolver cr = getContentResolver();
myCursor = cr.query(Uri.parse(contentsms), null, null, null, MessageAddress + ASC); //getting sorted data to easy finding uniqueness
/**setting up unique DisplayNames array**/
int allCount = myCursor.getCount(), uniqueCount = 0;
String[] uniqueNames = new String[allCount];
String temp1,temp2;
myCursor.moveToFirst();
temp1 = getContactDiplayNameByAddr();
uniqueNames[uniqueCount++] = temp1;
do {
temp2 = getContactDiplayNameByAddr();
if (temp1.compareTo(temp2) != 0){
uniqueNames[uniqueCount++] = temp2;
temp1 = temp2;
}
}while(myCursor.moveToNext());
String [] valuesArray = new String[uniqueCount]; //filling the array
for (int i = 0 ; i uniqueCount ; i++)
valuesArray[i] = uniqueNames[i];
/**setting up the ListView**/
ArrayAdapterString adapter = new ArrayAdapterString(this, android.R.layout.simple_list_item_multiple_choice, valuesArray);
pickerListView = (ListView)findViewById(R.id.PickerLV); //linking the object to the interface
pickerListView.setAdapter(adapter); //setting the adapter
pickerListView.setItemsCanFocus(false); //allowing to check the checkbox
pickerListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); //allowing multiple choices
}
String getContactDiplayNameByAddr() { //this function returns DisplayName, or if not available, returns the address
String Address = myCursor.getString(myCursor.getColumnIndex(address));
Uri personUri = Uri.withAppendedPath( ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Address);
Cursor cur = getContentResolver().query(personUri,
new String[] {PhoneLookup.DISPLAY_NAME},
null, null, null );
if( cur.moveToFirst() ) {
String DisplayName = cur.getString(cur.getColumnIndex(PhoneLookup.DISPLAY_NAME));
cur.close();
return DisplayName;
}
return Address;
}
}
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