java - How to get a two level list view to work within a swipe tab layout -
i'm trying create app user can select item in list , click item in list opens page, i've got work on own , i've managed put swipe tab layout when user clicks on item doesn't did before in own activity can help?
i've been told need create activity class implements onarticleselected method , let mainactivity , softwaresearchactivity extend activity class avoid code-duplication.
but don't know means or how implement it. i've literally been doing month i'm not familiar of terms used.
i think of code in there had working before don't know how rearrange work within in swipe tab layout.
articlefragment.java
/* * copyright (c) 2012 android open source project * * licensed under apache license, version 2.0 (the "license"); * may not use file except in compliance license. * may obtain copy of license @ * * http://www.apache.org/licenses/license-2.0 * * unless required applicable law or agreed in writing, software * distributed under license distributed on "as is" basis, * without warranties or conditions of kind, either express or implied. * see license specific language governing permissions , * limitations under license. */ package com.learn2crack.tab; import android.support.v4.app.fragment; import android.os.bundle; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.textview; public class articlefragment extends fragment { final static string arg_position = "position"; int mcurrentposition = -1; @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { // if activity recreated (such screen rotate), restore // previous article selection set onsaveinstancestate(). // necessary when in two-pane layout. if (savedinstancestate != null) { mcurrentposition = savedinstancestate.getint(arg_position); } // inflate layout fragment return inflater.inflate(r.layout.article_view, container, false); } @override public void onstart() { super.onstart(); // during startup, check if there arguments passed fragment. // onstart place because layout has been // applied fragment @ point can safely call method // below sets article text. bundle args = getarguments(); if (args != null) { // set article based on argument passed in updatearticleview(args.getint(arg_position)); } else if (mcurrentposition != -1) { // set article based on saved instance state defined during oncreateview updatearticleview(mcurrentposition); } } public void updatearticleview(int position) { textview article = (textview) getactivity().findviewbyid(r.id.article); article.settext(ipsum.articles[position]); mcurrentposition = position; } @override public void onsaveinstancestate(bundle outstate) { super.onsaveinstancestate(outstate); // save current article selection in case need recreate fragment outstate.putint(arg_position, mcurrentposition); } } headlinesfragment.java
/* * copyright (c) 2012 android open source project * * licensed under apache license, version 2.0 (the "license"); * may not use file except in compliance license. * may obtain copy of license @ * * http://www.apache.org/licenses/license-2.0 * * unless required applicable law or agreed in writing, software * distributed under license distributed on "as is" basis, * without warranties or conditions of kind, either express or implied. * see license specific language governing permissions , * limitations under license. */ package com.learn2crack.tab; import android.app.activity; import android.os.build; import android.os.bundle; import android.support.v4.app.listfragment; import android.view.view; import android.widget.arrayadapter; import android.widget.listview; public class headlinesfragment extends listfragment { onheadlineselectedlistener mcallback; // container activity must implement interface frag can deliver messages public interface onheadlineselectedlistener { /** called headlinesfragment when list item selected */ public void onarticleselected(int position); } @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); // need use different list item layout devices older honeycomb int layout = build.version.sdk_int >= build.version_codes.honeycomb ? android.r.layout.simple_list_item_activated_1 : android.r.layout.simple_list_item_1; // create array adapter list view, using ipsum headlines array setlistadapter(new arrayadapter<string>(getactivity(), layout, ipsum.headlines)); } @override public void onstart() { super.onstart(); // when in two-pane layout, set listview highlight selected list item // (we during onstart because @ point listview available.) if (getfragmentmanager().findfragmentbyid(r.id.article_fragment) != null) { getlistview().setchoicemode(listview.choice_mode_single); } } @override public void onattach(activity activity) { super.onattach(activity); // makes sure container activity has implemented // callback interface. if not, throws exception. try { mcallback = (onheadlineselectedlistener) activity; } catch (classcastexception e) { throw new classcastexception(activity.tostring() + " must implement onheadlineselectedlistener"); } } @override public void onlistitemclick(listview l, view v, int position, long id) { // notify parent activity of selected item mcallback.onarticleselected(position); // set item checked highlighted when in two-pane layout getlistview().setitemchecked(position, true); } } mainactivity.java
package com.learn2crack.tab; import android.app.actionbar; import android.app.fragmenttransaction; import android.os.bundle; import android.support.v4.app.fragmentactivity; import android.support.v4.view.viewpager; public class mainactivity extends fragmentactivity implements headlinesfragment.onheadlineselectedlistener { viewpager tab; tabpageradapter tabadapter; actionbar actionbar; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); tabadapter = new tabpageradapter(getsupportfragmentmanager()); tab = (viewpager)findviewbyid(r.id.pager); tab.setonpagechangelistener( new viewpager.simpleonpagechangelistener() { @override public void onpageselected(int position) { actionbar = getactionbar(); actionbar.setselectednavigationitem(position); } }); tab.setadapter(tabadapter); actionbar = getactionbar(); //enable tabs on action bar actionbar.setnavigationmode(actionbar.navigation_mode_tabs); actionbar.tablistener tablistener = new actionbar.tablistener(){ @override public void ontabreselected(android.app.actionbar.tab tab, fragmenttransaction ft) { // todo auto-generated method stub } @override public void ontabselected(actionbar.tab tab, fragmenttransaction ft) { tab.setcurrentitem(tab.getposition()); } @override public void ontabunselected(android.app.actionbar.tab tab, fragmenttransaction ft) { // todo auto-generated method stub }}; //add new tab actionbar.addtab(actionbar.newtab().settext("android").settablistener(tablistener)); actionbar.addtab(actionbar.newtab().settext("ios").settablistener(tablistener)); actionbar.addtab(actionbar.newtab().settext("windows").settablistener(tablistener)); } @override public void onarticleselected(int position) { // todo auto-generated method stub } } softwaresearchactivity.java
/* * copyright (c) 2012 android open source project * * licensed under apache license, version 2.0 (the "license"); * may not use file except in compliance license. * may obtain copy of license @ * * http://www.apache.org/licenses/license-2.0 * * unless required applicable law or agreed in writing, software * distributed under license distributed on "as is" basis, * without warranties or conditions of kind, either express or implied. * see license specific language governing permissions , * limitations under license. */ package com.learn2crack.tab; import android.os.bundle; import android.support.v4.app.fragmentactivity; import android.support.v4.app.fragmenttransaction; interface onheadlineselectedlistener { /** called headlinesfragment when list item selected */ public void onarticleselected(int position); } public class softwaresearchactivity extends fragmentactivity implements headlinesfragment.onheadlineselectedlistener { /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.news_articles); // check whether activity using layout version // fragment_container framelayout. if so, must add first fragment if (findviewbyid(r.id.fragment_container) != null) { // however, if we're being restored previous state, // don't need , should return or else // end overlapping fragments. if (savedinstancestate != null) { return; } // create instance of examplefragment headlinesfragment firstfragment = new headlinesfragment(); // in case activity started special instructions intent, // pass intent's extras fragment arguments firstfragment.setarguments(getintent().getextras()); // add fragment 'fragment_container' framelayout getsupportfragmentmanager().begintransaction() .add(r.id.fragment_container, firstfragment).commit(); } } public void onarticleselected(int position) { // user selected headline of article headlinesfragment // capture article fragment activity layout articlefragment articlefrag = (articlefragment) getsupportfragmentmanager().findfragmentbyid(r.id.article_fragment); if (articlefrag != null) { // if article frag available, we're in two-pane layout... // call method in articlefragment update content articlefrag.updatearticleview(position); } else { // if frag not available, we're in one-pane layout , must swap frags... // create fragment , give argument selected article articlefragment newfragment = new articlefragment(); bundle args = new bundle(); args.putint(articlefragment.arg_position, position); newfragment.setarguments(args); fragmenttransaction transaction = getsupportfragmentmanager().begintransaction(); // replace whatever in fragment_container view fragment, // , add transaction stack user can navigate transaction.replace(r.id.fragment_container, newfragment); transaction.addtobackstack(null); // commit transaction transaction.commit(); } } } tabpageradapter.java
package com.learn2crack.tab; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentstatepageradapter; public class tabpageradapter extends fragmentstatepageradapter { public tabpageradapter(fragmentmanager fm) { super(fm); // todo auto-generated constructor stub } @override public fragment getitem(int i) { switch (i) { case 0: //fragement android tab return new headlinesfragment(); case 1: //fragment ios tab return new windows(); case 2: //fragment windows tab return new windows(); } return null; } @override public int getcount() { // todo auto-generated method stub return 3; //no of tabs } } activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.v4.view.viewpager xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="match_parent" /> article_view.xml <?xml version="1.0" encoding="utf-8"?> <textview xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/article" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp" android:textsize="18sp" /> news_article.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > </linearlayout> layout-large folder
new_articles.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent"> <fragment android:name="com.example.android.fragments.headlinesfragment" android:id="@+id/headlines_fragment" android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" /> <fragment android:name="com.example.android.fragments.articlefragment" android:id="@+id/article_fragment" android:layout_weight="2" android:layout_width="0dp" android:layout_height="match_parent" /> </linearlayout> androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.learn2crack.tab" android:versioncode="1" android:versionname="1.0" > <uses-permission android:name="android.permission.internet"/> <uses-permission android:name="android.permission.access_network_state"/> <uses-permission android:name="android.permission.write_external_storage"/> <uses-permission android:name="com.google.android.providers.gsf.permission.read_gservices"/> <!-- following 2 permissions not required use google maps android api v2, recommended. --> <uses-permission android:name="android.permission.access_coarse_location"/> <uses-permission android:name="android.permission.access_fine_location"/> <uses-sdk android:minsdkversion="15" android:targetsdkversion="19" /> <application android:allowbackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/apptheme" > <activity android:name="com.learn2crack.tab.mainactivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> <meta-data android:name="com.google.android.maps.v2.aizasydtqicxqalanjtjyxy-ghqsg7rod4tm8hq" android:value="aizasydtqicxqalanjtjyxy-ghqsg7rod4tm8hq"/> </application> </manifest>
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