i have created a new project and included the HoloEveryWhere library. Then I decided to add the ViewPageIndicator.
I copied all the code from ViewPageIndicator sample but it didn't work.
I tried using SherlockFragment but that didn't work either.
So I removed HoloEveryWhere from my project but apparently that wasn't the problem cause it still doesn't swipe.
edit:
this is my xml:
<RelativeLayout 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"
tools:context=".MainActivity" >
<com.viewpagerindicator.TabPageIndicator
android:id="#+id/indicator"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
/>
you see, i just copied the two tags from the samples.
this is the main.java:
package com.example.test;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import com.viewpagerindicator.TabPageIndicator;
public class MainActivity extends FragmentActivity {
private static final String[] CONTENT = new String[] { "Recent", "Artists", "Albums", "Songs", "Playlists", "Genres" };
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentPagerAdapter adapter = new GoogleMusicAdapter(getSupportFragmentManager());
ViewPager pager = (ViewPager)findViewById(R.id.pager);
pager.setAdapter(adapter);
TabPageIndicator indicator = (TabPageIndicator)findViewById(R.id.indicator);
indicator.setViewPager(pager);
}
class GoogleMusicAdapter extends FragmentPagerAdapter {
public GoogleMusicAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return TestFragment.newInstance(CONTENT[position % CONTENT.length]);
}
#Override
public CharSequence getPageTitle(int position) {
return CONTENT[position % CONTENT.length];
}
#Override
public int getCount() {
return CONTENT.length;
}
}
}
Your layout is the source of your difficulty.
If you are going to use RelativeLayout, you need to specify where the widgets inside the RelativeLayout go. By default, they all go in the upper-left corner, and later children (your ViewPager) float over top of earlier children (your TabPageIndicator) on the Z axis. Hence, with your current layout, the user cannot touch your TabPageIndicator.
Either switch to a vertical LinearLayout or use the appropriate attributes (e.g., android:layout_below) to organize your widgets in the RelativeLayout so that they do not overlap.
Hierarchy View is a useful tool for helping you identify this sort of problem.
Related
I have one activity and two tabs in that activity Tab1 and Tab2. These are the two fragments. In my Tab1 have an EditText field and a Button field and Tab2 have only one TextView Field.I want to get the value in EditText field in the Tab1 in to TextView field in Tab2 when I click the button in the Tab1 and also get value when swipe Tab1 to Tab2. I also check many websites but did't get any solution. If anyone know it please help me.
MainActivity.java
package reubro.com.fragment;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {
TabLayout tabLayout;
ViewPager viewPager;
Tab1 t2;
EditText ed1;
Tab1 t1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
t1 = new Tab1();
ed1 = (EditText) findViewById(R.id.ed1);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
tabLayout = (TabLayout) findViewById(R.id.tab);
viewPager = (ViewPager) findViewById(R.id.pager);
tabLayout.addTab(tabLayout.newTab().setText("Tab1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab2"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
Pager pager = new Pager(getSupportFragmentManager(),tabLayout.getTabCount());
viewPager.setAdapter(pager);
tabLayout.setOnTabSelectedListener(this);
}
public void onTabSelected(TabLayout.Tab tab){
viewPager.setCurrentItem(tab.getPosition());
// ed1.setText(t1.ed.getText());
// Log.d("cccccc",ed1.getText().toString());
}
public void onTabUnselected(TabLayout.Tab tab) {
}
public void onTabReselected(TabLayout.Tab tab) {
}
}
Tab1.java
package reubro.com.fragment;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
/**
* Created by pc84 on 20/1/17.
*/
public class Tab1 extends Fragment {
Button b1;
EditText ed;
String val;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup viewGroup, final Bundle bundle){
View view = inflater.inflate(R.layout.tab1,viewGroup,false);
b1 = (Button) view.findViewById(R.id.btn1);
ed = (EditText) view.findViewById(R.id.ed1);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
val = ed.getText().toString().trim();
if(!(val.isEmpty())){
Log.d("inner",val);
Tab2 tab2 = new Tab2();
Bundle bundle = new Bundle();
bundle.putString("val",val);
tab2.setArguments(bundle);
Toast.makeText(getActivity(),"This is value: "+val,Toast.LENGTH_LONG).show();
}
}
});
return view;
}
}
Tab2.java
package reubro.com.fragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
* Created by pc84 on 20/1/17.
*/
public class Tab2 extends Fragment {
TextView tv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup viewGroup, Bundle bundle){
View view = inflater.inflate(R.layout.tab2,viewGroup,false);
tv = (TextView) view.findViewById(R.id.tv1);
Bundle bundle1 = this.getArguments();
if (bundle1 != null){
String val = bundle1.getString("val");
tv.setText(val);
Log.d("tttttt",val);
}
return view;
}
}
Pager.java
package reubro.com.fragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
/**
* Created by pc84 on 20/1/17.
*/
public class Pager extends FragmentStatePagerAdapter {
int tabCount;
public Pager(FragmentManager fm, int tabCount) {
super(fm);
this.tabCount = tabCount;
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
Tab1 tab1 = new Tab1();
return tab1;
case 1:
Tab2 tab2 = new Tab2();
return tab2;
default:
return null;
}
}
#Override
public int getCount() {
return tabCount;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:id="#+id/tab"
/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
tab1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/ed1"
android:hint="Enter something"
android:layout_margin="20dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:id="#+id/btn1"
android:layout_below="#+id/ed1"
android:text="Send to Next Fragment"
android:textAllCaps="false"/>
</RelativeLayout>
tab2.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Tab2"
android:gravity="center"/>
</RelativeLayout>
You can place your data into a Singleton referenced both into Tab1 and Tab2.
A Singleton is a programming pattern that let you to use always the same and the only one instance of a class.
This is an example:
public class ClassicSingleton {
private static ClassicSingleton instance = null;
protected ClassicSingleton() {
// Exists only to defeat instantiation.
}
public static ClassicSingleton getInstance() {
if(instance == null) {
instance = new ClassicSingleton();
}
return instance;
}
}
Take a look here to have a more detailed description:
Use ViewModel as a parent data sharing in the parent activity so you can use the same context as viewLifeCycleOwner so you can easily handle the data view and data
To pass data from one tab to another, you can either send a broadcast or if you don't want to broadcast then first pass it to activity through callback then from activity to tab2.
You try to use BroadcastReceiver.
In Tab1 : you send broadcast with data
In Tab2 : you get data from broadcast and set page index
You Can use Live Data object with View Model You can Implement it easily with new Android Architecture.
Doc : https://developer.android.com/topic/libraries/architecture/livedata
No need to EventBus Anymore and Interface for getting LiveData.
I've encountered a similar scenario and came up with the following:
Have the MainActivityViewModel hold any data you may need, and set
it accordingly when the event you are interested in is triggered.
You can then trigger the navigation to the destination tab
programmatically(even if you are using the multiple-stack workaround
used here
https://github.com/googlesamples/android-architecture-components/tree/master/NavigationAdvancedSample),
and have it get any information it may need from the
MainActivityViewModel.
As soon as the information is read, set it to null so it won't be
used again by mistake. You should also have a default behavior, for
when the tab comes up for other reasons, and that variable is null.
Honestly, I'm not sure if by doing this I've gone against some best practices or something, but it has proven useful, and doesn't feel too "hacky".
if your willing to wait until the tab is resumed:
it can be done like this: in your main activity navigation host have a function like this:
fun moveToTabPosition(tabPosition: Int, bundle: Bundle?) {
myFragment?.arguments?.let { it.putAll(bundle) } ?: run { myfragment?.arguments = bundle }
binding.tablayout.setSelectedTab(tabPosition)
binding.yourViewPager.currentItem = tabPosition
}
then just call that with your new bundle updates.
important: in onResume of each tab fragment have a function called updateBundle() and parse the arguments you want again.
the key here is the the arguments have a method called putAll
UPDATE: I want to avoid putAll now ...i notice after Android N it cannot allow to add values to the arguments after the fragment is attached. During QA testing it passed but some users had this issue so had to remove this call.
i got an error on some devices of: java.lang.UnsupportedOperationException : ArrayMap is immutable
Now im in favor of a common interface to call to update the set the arguments data. it would take a bundle as param.
I've implemented an infinite ViewPager in situ https://github.com/JoachimR/AnyDayViewPager. However, instead of using a PagerTabStrip, I'd prefer to use a CoordinatorLayout with TabLayout. But when setting up the TabLayout with the viewpager, (I'm assuming because there are an "infinite number of ViewPager Fragments") the app gets stuck.
How can I solve this issue?
Here's the code
(the other files which I have not changed can be found at JoachimR/AnyDayViewPager, e.g., FragmentContent.java, CachingFragmentStatePagerAdapter.java, TimeUtils.java, etc)
MainActivity.java
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.support.design.widget.TabLayout;
import android.os.Bundle;
import java.util.Calendar;
public class MainActivity extends FragmentActivity {
private static Context mContext;
private CachingFragmentStatePagerAdapter adapterViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
ViewPager vpPager = (ViewPager) findViewById(R.id.vpPager);
adapterViewPager = new MyPagerAdapter(getSupportFragmentManager());
vpPager.setAdapter(adapterViewPager);
// set pager to current date
vpPager.setCurrentItem(TimeUtils.getPositionForDay(Calendar.getInstance()));
/** THIS IS WHERE THE ISSUES ARISE **/
TabLayout tabLayoutDiary = (TabLayout) findViewById(R.id.diary_tabs);
tabLayoutDiary.setupWithViewPager(vpPager);
}
public static class MyPagerAdapter extends CachingFragmentStatePagerAdapter {
private Calendar cal;
public MyPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
#Override
public int getCount() {
return TimeUtils.DAYS_OF_TIME;
}
#Override
public Fragment getItem(int position) {
long timeForPosition = TimeUtils.getDayForPosition(position).getTimeInMillis();
return FragmentContent.newInstance(timeForPosition);
}
#Override
public CharSequence getPageTitle(int position) {
Calendar cal = TimeUtils.getDayForPosition(position);
return TimeUtils.getFormattedDate(mContext, cal.getTimeInMillis());
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:fab="http://schemas.android.com/tools">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.TabLayout
android:id="#+id/diary_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="scrollable"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/vpPager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
Possibly due to this bug: https://code.google.com/p/android/issues/detail?id=180027
TabLayout creates a TextView tab for each page in your ViewPager, rather than dynamically creating and recycling the TextViews. As you're seeing, this will just blow up if you try to fake out an infinite ViewPager.
Unfortunately, there's no fix for now. You can try using https://github.com/nshmura/RecyclerTabLayout which was linked on the bug, but I've not used it myself.
I want to create an Activity with tabs (probably using TabHost) that looks something like this:
This layout also has some buttons, checkboxes and a gridview, but I'm mostly interested to find out how I would have my tabs look like this, because by default they look something like this:
My problem is that I have no clue how to do it, I have made drawables for some UI components before, but this is something different, I think.
After quite some time I have figured how to get what I wanted, by trying out a lot of different ways to make tabs an I finally ended up using a TabLayout with a ViewPager.
I have made a Proof of Concept and it looks like this:
If anyone is interested in the code, this is the layout of the main activity
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="10">
<View
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_weight="0.2"/>
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="4"
app:tabMode="fixed"
app:tabGravity="fill"
app:tabPaddingStart="2dp"
app:tabPaddingEnd="2dp"
app:tabPaddingTop="2dp"/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="5.8"/>
</LinearLayout>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
The MainActivity.java:
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements FirstTabFragment.OnFragmentInteractionListener, SecondTabFragment.OnFragmentInteractionListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
tabLayout.setSelectedTabIndicatorColor(Color.TRANSPARENT);
viewPager.setAdapter(new SectionPagerAdapter(getSupportFragmentManager()));
tabLayout.setupWithViewPager(viewPager);
TabLayout.Tab tab = tabLayout.getTabAt(0);
RelativeLayout relativeLayout = (RelativeLayout) LayoutInflater.from(this).inflate(R.layout.tab_layout_file1, tabLayout, false);
TextView tabTextView = (TextView) relativeLayout.findViewById(R.id.tab_title);
tabTextView.setText(tab.getText());
tab.setCustomView(relativeLayout);
TabLayout.Tab tab2 = tabLayout.getTabAt(1);
RelativeLayout relativeLayout2 = (RelativeLayout) LayoutInflater.from(this).inflate(R.layout.tab_layout_file2, tabLayout, false);
TextView tabTextView2 = (TextView) relativeLayout2.findViewById(R.id.tab_title);
tabTextView2.setText(tab2.getText());
tab2.setCustomView(relativeLayout2);
tab.select();
}
#Override
public void onFragmentInteraction(Uri uri) {
}
public class SectionPagerAdapter extends FragmentPagerAdapter {
public SectionPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FirstTabFragment();
case 1:
default:
return new SecondTabFragment();
}
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "First Tab";
case 1:
default:
return "Second Tab";
}
}
}
}
TabLayout1 (TabLayout2 is the same but uses shape2)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/tab_title"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:background="#drawable/shape1"
android:textColor="#android:color/white"/>
</RelativeLayout>
The shapes are just a red and a blue rectangle and and the Fragments are default
empty Fragments with the same color background as the shapes.
I am a newbie in Android, how can I do something like that.
I extend TabActivity when to create Tabs like this but without that header.
If you want to implement the view you post here ,you can code the view by yourself:
the header is in the top ,and below the header ,a TabHost is needed ,below the TabHost,you put a viewpager contains two fragments to display your data,you can control your viewpager with method setCurrentItem when you click tabs.
Try this code
MainActivity
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import com.viewpagerindicator.CirclePageIndicator;
public class LauncherActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_launcher);
pager.setAdapter(new GuidePagerAdapter(getSupportFragmentManager()));
indicator.setViewPager(pager);
}
}
ativity_main
<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:background="#drawable/background"
android:orientation="vertical"
>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#80000000"
android:orientation="vertical" >
<com.viewpagerindicator.CirclePageIndicator
android:id="#+id/indicator"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="30dp" />
</LinearLayout>
</LinearLayout>
Adapter
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
public class GuidePagerAdapter extends FragmentStatePagerAdapter {
public GuidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int pos) {
if (pos == 0)
return new Fragment1();
else
return new Fragment2();
}
#Override
public int getCount() {
return 2;
}
}
You can add two tabs on main_activity and on click of tab change the fragment in adapter.
Here is main activity layout XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="fill_parent">
<LinearLayout
android:id="#+id/left"
android:layout_width="100dp"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:background="#color/red"
android:orientation="horizontal" >
</LinearLayout>
<android.support.v4.view.ViewPager
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/pager"
android:layout_width="0dip"
android:layout_height="fill_parent"
android:layout_toLeftOf="#+id/left"
android:layout_toRightOf="#+id/right"
tools:context=".MainActivity" />
<LinearLayout
android:id="#+id/right"
android:layout_width="100dp"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:background="#color/red"
android:orientation="horizontal" >
</LinearLayout>
</RelativeLayout>
Fragment Layout XML :
<?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="horizontal"
tools:context=".DummySectionFragment" android:background="#color/gray">
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Main Activity :
package com.example.androidtest;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {#link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {#link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager(), getApplicationContext());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
}
Fragment :
package com.example.androidtest;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_dummy,
container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
Pager Adapter :
package com.example.androidtest;
import java.util.Locale;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private Context context;
public SectionsPagerAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return context.getString(R.string.title_section1).toUpperCase(l);
case 1:
return context.getString(R.string.title_section2).toUpperCase(l);
case 2:
return context.getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
Expected : 2 red bars on both sides. ViewPager in the middle.
Whats happening : 2 red bars on both sides. Blank in the middle.
Question : Why ?
EDIT :
I modified the main activity layout XML to the following to get this to work.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="fill_parent">
<LinearLayout
android:id="#+id/left"
android:layout_width="100dp"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:background="#color/red"
android:orientation="horizontal" >
</LinearLayout>
<android.support.v4.view.ViewPager
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/pager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity" android:layout_toRightOf="#+id/left"/>
<LinearLayout
android:id="#+id/right"
android:layout_width="100dp"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:background="#color/red"
android:orientation="horizontal" >
</LinearLayout>
</RelativeLayout>
Only change is I removed android:layout_toRightOf="#+id/right" and changed layout_width="fill_parent". Fill_parent I understand. By why does removing the other make a difference ?
You have to do two things in main.xml:
Use LinearLayout instead of RelativeLayout for your main.xml with horizontal orientation.
Add android:layout_weight="1" to your View Pager.
Well, your viewPager's width is: android:layout_width="0dip". No wonder is blank in the middle. Try setting it to android:layout_width="match_parent". In this way it will use all space between right and left views.