Get Android phone call history/log programmatically

To get call history programmatically first add read conact permission in Manifest file :
<uses-permission android:name="android.permission.READ_CONTACTS" />

Create xml file. Add the below code in xml file :

<Linearlayout android:layout_height="fill_parent"
 android:layout_width="fill_parent"
android:orientation="vertical">
<Textview android:id="@+id/call"
android:layout_height="fill_parent"
android:layout_width="fill_parent">
</Textview>
</Linearlayout>

Now call the getCallDetails() method in java class :

private void getCallDetails() {

StringBuffer sb = new StringBuffer();
Cursor managedCursor = managedQuery( CallLog.Calls.CONTENT_URI,null, null,null, null);
int number = managedCursor.getColumnIndex( CallLog.Calls.NUMBER );
int type = managedCursor.getColumnIndex( CallLog.Calls.TYPE );
int date = managedCursor.getColumnIndex( CallLog.Calls.DATE);
int duration = managedCursor.getColumnIndex( CallLog.Calls.DURATION);
sb.append( "Call Details :");
while ( managedCursor.moveToNext() ) {
String phNumber = managedCursor.getString( number );
String callType = managedCursor.getString( type );
String callDate = managedCursor.getString( date );
Date callDayTime = new Date(Long.valueOf(callDate));
String callDuration = managedCursor.getString( duration );
String dir = null;
int dircode = Integer.parseInt( callType );
switch( dircode ) {
case CallLog.Calls.OUTGOING_TYPE:
dir = "OUTGOING";
break;

case CallLog.Calls.INCOMING_TYPE:
dir = "INCOMING";
break;

case CallLog.Calls.MISSED_TYPE:
dir = "MISSED";
break;
}
sb.append( "\nPhone Number:--- "+phNumber +" \nCall Type:--- "+dir+" \nCall Date:--- "+callDayTime+" \nCall duration in sec :--- "+callDuration );
sb.append("\n----------------------------------");
}
managedCursor.close();
call.setText(sb);
}

Using this application user can access his call history. It show call number,call type i.e. incoming/outgoing/missed call, call date-time and call duration.
Here is the output where user can see all details :

Delete contacts from Android device

We can delete the contacts from android device programmatically.

Declare the permissions in manifest file:



Using Android 1.6 :
getContentResolver().delete(Contacts.People.CONTENT_URI,null,null);

Using Android 2.0 and above:
getContentResolver().delete(ContactsContract.RawContacts.CONTENT_URI,null,
null);

Installed application information in Android

Using PackageManager we can get the all installed application details in Android device like package name,version code,version info,class name etc.

Code snippet:

PackageManager pckMgr;
pckMgr = getPackageManager();
List appInfo = pckMgr.getInstalledPackages(PackageManager.GET_ACTIVITIES);
Log.i("Number of Applications are installed " ,":"+ appInfo.size());
for ( int cnt=0; cnt < appInfo.size(); cnt++){

Log.i("Package name ",":"+appInfo.get(cnt).packageName);
Log.i("Application name ",":"+appInfo.get(cnt).applicationInfo.loadLabel(getPackageManager()));
Log.i("Version code ",":"+appInfo.get(cnt).versionCode);
Log.i("Version name ",":"+appInfo.get(cnt).versionName);

}