Android Development Tips: Invoking different Android system Activity / Apps 1 (Phone / Dialing related)

When developing Android application, we always need to invoke other system applcation (e.g. contact, phone dialer, camera,etc) In this post, I will summarize some method to invoke different phone and dialing related system activity.
1. Start the phone dialer

Intent intent =new Intent();  
intent.setAction("android.intent.action.CALL_BUTTON");  
startActivity(intent);  

OR

Uri uri = Uri.parse("tel:xxxxxx");   
Intent intent = new Intent(Intent.ACTION_DIAL, uri);     
startActivity(intent); 

2. Go to Dialer Applciation

Intent intent= new Intent("android.intent.action.DIAL");   
intent.setClassName("com.android.contacts","com.android.contacts.DialtactsActivity");  

3. Open Phone Contacts List

Intent intent = new Intent();   
intent.setAction(Intent.ACTION_VIEW);   
intent.setData(Contacts.People.CONTENT_URI);   
startActivity(intent);   

4. Pick a Phone Contact

Intent intent = new Intent();   
intent.setAction(Intent.ACTION_PICK);   
intent.setData(Contacts.People.CONTENT_URI);   
startActivity(intent);   

5. Edit a phone contact

Intent intent=new Intent(Intent.ACTION_EDIT,Uri.parse("content://com.android.contacts/contacts/"+"1"));  
startActivity(intent);  

6. Add a new phone contact

Intent intent = new Intent(Intent.ACTION_INSERT_OR_EDIT);  
            intent.setType("vnd.android.cursor.item/person");  
            intent.setType("vnd.android.cursor.item/contact");  
            intent.setType("vnd.android.cursor.item/raw_contact");  
            intent.putExtra(android.provider.ContactsContract.Intents.Insert.NAME, name);  
            intent.putExtra(android.provider.ContactsContract.Intents.Insert.COMPANY,company);  
            intent.putExtra(android.provider.ContactsContract.Intents.Insert.PHONE, tel);  
            intent.putExtra(android.provider.ContactsContract.Intents.Insert.PHONE_TYPE, 3);  

7. Invoke send SMS and MMS UI

Intent intent = new Intent(Intent.ACTION_VIEW);  
                intent.setType("vnd.android-dir/mms-sms");  
                startActivity(intent);