Android lock screen unread text message, missed phone

It is also the lock screen, there is no way to do the lock screen in the company are crazy.

The screen lock interface usually contains unread text messages and unanswered phone numbers, wrapped in a red circle, it is estimated that they are all imitated from Apple, but it does not matter, as a programmer, we will do our best to implement this function. Here we will not describe how to implement the interface, just briefly introduce the data acquisition method.

First, I understand where the text messages and missed calls are stored? Androd has a complete set of data access interfaces that provide third-party app access, but permissions must be declared before access. Permission Declaration is very simple, as long as you add the manifest file in the APK, which is not described here.

Because the lock screen is in the framework, you do not need to add the corresponding permissions. If a third-party app needs to implement similar functions, you must declare the permissions. This is why the user privacy of Android phones is easily leaked.

SMS storage location:/data/COM. Android. provider/telephony/databases/telphony. DB

Call record storage location:/data/COM. Android. provider/telephony/databases/mmssms. DB

How to obtain the number of unread SMS messages:

Because the short message contains short messages and MMS 2, you need to query the message twice. SMS is short message, and MMS is MMs.

Cursor curMms = null;int count = 0;try {String sql = Mms.READ + " = 0 and " + Mms.MESSAGE_TYPE + " != " + PduHeaders.MESSAGE_TYPE_DELIVERY_IND// + " and " + Mms.MESSAGE_TYPE + " != " + PduHeaders.MESSAGE_TYPE_READ_ORIG_IND;curMms = contentResolver.query(Uri.parse("content://mms/inbox"), null, sql, null, null);count = curMms.getCount();} catch (Exception e) {XLog.e(e.toString());e.printStackTrace();} finally {if (null != curMms) {curMms.close();}}Cursor curSms = null;try {curSms = contentResolver.query(Uri.parse("content://sms"), null, "type = 1 and read = 0", null, null);count += curSms.getCount();} catch (Exception e) {e.printStackTrace();XLog.e(e.toString());} finally {if (null != curSms) {curSms.close();}}

How to obtain the number of missed calls:

You need to query the call records for missed calls. There are three types of call records: power-off, incoming calls, and missed calls.

Uri uri = Calls.CONTENT_URI;String[] projects = new String[] { Calls._ID, Calls.NEW, Calls.DATE };String selections = Calls.NEW + " = ? AND " + Calls.TYPE + " = ? AND " + Calls.IS_READ + " = ? ";String[] args = { "1", Integer.toString(Calls.MISSED_TYPE), Integer.toString(0) };Cursor cursor = contentResolver.query(uri, projects, selections, args, null);int count = 0;if (cursor != null) {try {count = cursor.getCount();} finally {cursor.close();}}