Intent Component,action and Category Properties-android learning Journey (50)

Component Property

code example

 Public  class mainactivity extends Activity{    @Override    protected void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main); Findviewbyid (r.id.btnintent). Setonclicklistener (NewView.onclicklistener () {@Override             Public void OnClick(View view) {ComponentName name =NewComponentName (mainactivity. This, Mainactivity2.class); Intent Intent =NewIntent ();                Intent.setcomponent (name);            StartActivity (Intent);    }        }); }

Action and Category properties and Intentfilter configuration

code example

 Public  class mainactivity extends Activity{     Public  Final StaticString liupeng_action ="Liu.intent.action.liuaction";@Override    protected void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main); Findviewbyid (r.id.btnintent). Setonclicklistener (NewView.onclicklistener () {@Override             Public void OnClick(View view) {Intent Intent =NewIntent ();                Intent.setaction (mainactivity.liupeng_action);            StartActivity (Intent);    }        }); }}

<activityandroid:name=". MainActivity2 "android:label=" @string/title_activity_main_activity2 " >                                    <intent-filter>                <action android:name="liu.intent.action.liuaction"/>                <category android:name="Android.intent.category.DEFAULT"/>            </intent-filter>        </activity>

Introduction to the action and category of the system

View and get system Contact data Demo

 Public  class mainactivity extends Activity{    Final intPick_contact =0;@Override    protected void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main); Findviewbyid (r.id.btncontacts). Setonclicklistener (NewView.onclicklistener () {@Override             Public void OnClick(View view) {Intent Intent =NewIntent ();                Intent.setaction (intent.action_get_content); Intent.settype ("Vnd.android.cursor.item/phone");            Startactivityforresult (intent,pick_contact);    }        }); }@Override    protected void Onactivityresult(intRequestcode,intResultCode, Intent data) {Super. Onactivityresult (Requestcode, ResultCode, data);if(Requestcode = = Pick_contact && ResultCode = = RESULT_OK)            {Uri contactsdata = Data.getdata (); Cursorloader Cursorloader =NewCursorloader ( This, Contactsdata,NULL,NULL,NULL,NULL); cursor cursor = Cursorloader.loadinbackground ();if(Cursor.movetofirst ())                {String contactId = cursor.getstring (Cursor.getcolumnindex (contactscontract.contacts._id));                String name = cursor.getstring (Cursor.getcolumnindexorthrow (ContactsContract.Contacts.DISPLAY_NAME)); String PhoneNumber ="This contact has not entered a number"; Cursor phones = getcontentresolver (). Query (ContactsContract.CommonDataKinds.Phone.CONTENT_URI,NULL, contactscontract.commondatakinds.phone.contact_id+"="+contactid,NULL,NULL);if(Phones.movetofirst ())                 {PhoneNumber = phones.getstring (Phones.getcolumnindex (ContactsContract.CommonDataKinds.Phone.NUMBER));                } phones.close ();                ((EditText) Findviewbyid (r.id.show)). SetText (name);            ((EditText) Findviewbyid (R.id.phone)). SetText (PhoneNumber);        } cursor.close (); }    }}

Layout

<?xml version= "1.0" encoding= "Utf-8"?><linearlayout  xmlns: Android  = "http://schemas.android.com/apk/res/android"  xmlns:tools  =" Http://schemas.android.com/tools " android:layout_width  = "match_parent"  android:layout_height  =" match_parent " android:orientation  =;   <edittext  android:layout _width  = "fill_parent"  android:layout_height< /span>= "wrap_content"  android:id  = "@+id/show"  android:editable  = "False"  android:cursorvisible  = "false" />     <edittext  android:layout _width  = "fill_parent"  android:layout_height< /span>= "wrap_content"  android:id  = "@+id/phone"  android:editable  =         android:cursorvisible  = "false" />     <buttonandroid:layout_width="Wrap_content"android:layout_height= "Wrap_content" android:id="@+id/btncontacts"android:text="View Contacts"/>                                </linearlayout>

Back to Home Desktop demo

 Public  class mainactivity extends Activity{    @Override    protected void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main); Findviewbyid (r.id.btncontacts). Setonclicklistener (NewView.onclicklistener () {@Override             Public void OnClick(View view) {Intent Intent =NewIntent ();                Intent.setaction (Intent.action_main);                Intent.addcategory (Intent.category_home);            StartActivity (Intent);    }        }); }}

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Intent Component,action and Category Properties-android learning Journey (50)