I am using design support to create tabs. I am also using ViewPager for swipable tabs.
Now, I don't know how to use only icons instead of texts in tabs. I tried finding out but didn't get any success.
My code:
Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
setupViewPager(viewPager);
setupTablayout();
}
private void setupTablayout() {
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setupWithViewPager(viewPager);
}
class MyPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public MyPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
mFragmentTitleList.get(position)
}
}
private void setupViewPager(ViewPager viewPager) {
MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new frag(), "CAT");
adapter.addFrag(new frag(), "DOG");
adapter.addFrag(new frag(), "BIRD");
viewPager.setAdapter(adapter);
}
One approach is setting the icons after TabLayout.setupWithViewPager() method.
mTabLayout.setupWithViewPager(mViewPager);
for (int i = 0; i < mTabLayout.getTabCount(); i++) {
mTabLayout.getTabAt(i).setIcon(R.drawable.your_icon);
}
The tutorial shown in the following link should cover what you want. https://github.com/codepath/android_guides/wiki/Google-Play-Style-Tabs-using-TabLayout#add-icons-to-tablayout
I copied the relevant section below.
Add Icons to TabLayout
Currently, the TabLayout class does not provide a clean abstraction model that allows for icons in your tab. There are many posted workarounds, one of which is to return a SpannableString, containing your icon in an ImageSpan, from your PagerAdapter's getPageTitle(position) method as shown in the code snippet below:
private int[] imageResId = {
R.drawable.ic_one,
R.drawable.ic_two,
R.drawable.ic_three
};
// ...
#Override
public CharSequence getPageTitle(int position) {
// Generate title based on item position
// return tabTitles[position];
Drawable image = context.getResources().getDrawable(imageResId[position]);
image.setBounds(0, 0, image.getIntrinsicWidth(), image.getIntrinsicHeight());
SpannableString sb = new SpannableString(" ");
ImageSpan imageSpan = new ImageSpan(image, ImageSpan.ALIGN_BOTTOM);
sb.setSpan(imageSpan, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
return sb;
}
By default, the tab created by TabLayout sets the textAllCaps property to be true, which prevents ImageSpans from being rendered. You can override this behavior by changing the tabTextAppearance property.
<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
<item name="tabTextAppearance">#style/MyCustomTextAppearance</item>
</style>
<style name="MyCustomTextAppearance" parent="TextAppearance.Design.Tab">
<item name="textAllCaps">false</item>
</style>
In new version of TabLayout, google added TabItem which easily can add Icon through your XML with following code:
<android.support.design.widget.TabLayout
app:tabTextColor="#color/gray"
app:tabMode="fixed"
app:tabBackground="#color/red"
app:tabIndicatorHeight="4dp"
app:tabIndicatorColor="#color/purple"
app:tabPadding="2dp"
app:tabSelectedTextColor="#color/white"
app:tabMinWidth="64dp"
android:layout_height="wrap_content"
android:layout_width="match_parent">
<!--add height and width to TabItem -->
<android.support.design.widget.TabItem
android:text="#string/tab_text"/>
<android.support.design.widget.TabItem
android:icon="#drawable/ic_android"/>
</android.support.design.widget.TabLayout>
See more here.
try this
public class GlobalActivity extends AppCompatActivity {
Toolbar toolbar;
ViewPager viewPager;
TabLayout tabLayout;
ViewPagerAdapter adapter;
private int[] tabIcons = {
R.drawable.home_ic,
R.drawable.biz_ic,
R.drawable.network_ic,
R.drawable.offers_ic,
R.drawable.message_ic_b
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_global_hub);
tab();
}
public void tab(){
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tablayout);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
tabLayout.getTabAt(3).setIcon(tabIcons[3]);
tabLayout.getTabAt(4).setIcon(tabIcons[4]);
}
public void setupViewPager(ViewPager viewPager){
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new GlHubFragment(),"HOME");
adapter.addFrag(new BizForumFragment(), "BIZ FORUM");
adapter.addFrag(new NetworkFragment(), "NETWORK");
adapter.addFrag(new MessagesFragment(), "MESSAGEs");
adapter.addFrag(new OfferFragmentActivity(), "OFFER");
viewPager.setAdapter(adapter);
}
public class ViewPagerAdapter extends FragmentPagerAdapter{
private final List<Fragment> mfragmentlist =new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return mfragmentlist.get(position);
}
#Override
public int getCount() {
return mfragmentlist.size();
}
public void addFrag(Fragment fragment,String title){
mfragmentlist.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position){
return mFragmentTitleList.get(position);
}
}
}
In TabLayout, setting icon is easy:
getPageTitle(position) should return null (if you don't want title to show).
Next :
tabLayout.getTabAt(0).setIcon(resId);
tabLayout.getTabAt(1).setIcon(resId);
......
None of these methods are elegant when using TabLayout as the ViewPager "decor" scenario. TabLayout Documentation Here is a simple extension of TabLayout and PagerAdapter that provides a simple drop in replacement for TabLayout that should be able to be used in either scenario without manually adding icons outside of the TabLayout class and following the usage of PagerAdapter to get the tab information.
/**
* Created by JDL on 1/18/2017.
*/
public class TabLayoutExt extends TabLayout {
protected ViewPager mViewPager;
public abstract static class TabLayoutViewPagerAdapter extends PagerAdapter {
public TabLayoutViewPagerAdapter() {
}
/**
* This method may be called by the TabLayout to obtain an icon drawable
* to for the specified tab. This method may return null
* indicating no tab icon for this page. The default implementation returns
* null.
*
* #param position The position of the title requested
* #return A drawable icon for the requested page
*/
public Drawable getPageIcon(Context context, int position) {
return null;
}
}
public TabLayoutExt(Context context) {
super(context);
}
public TabLayoutExt(Context context, AttributeSet attrs) {
super(context, attrs);
}
public TabLayoutExt(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onAttachedToWindow() {
//Cover the implicit setup in TabLayout
if (mViewPager == null) {
final ViewParent vp = getParent();
if (vp instanceof ViewPager) {
mViewPager = (ViewPager)vp;
}
}
super.onAttachedToWindow();
}
public void addTab(#NonNull Tab tab, int position, boolean setSelected) {
if (mViewPager != null && mViewPager.getAdapter() instanceof TabLayoutViewPagerAdapter) {
Drawable icon = ((TabLayoutViewPagerAdapter) mViewPager.getAdapter()).getPageIcon(getContext(),position);
tab.setIcon(icon);
}
super.addTab(tab,position,setSelected);
}
#Override
public void setupWithViewPager(#Nullable ViewPager viewPager, boolean autoRefresh) {
mViewPager = viewPager;
super.setupWithViewPager(viewPager, autoRefresh);
}
}
So all that needs be done is extend TabLayoutViewPagerAdapter instead of PageAdapter and implement getPageIcon(Context,int) instead of or in addition to title. The drop in TabLayoutExt in your XML file, instead of the normal TabLayout. This could be extended for further modifying the tab, either with a custom view instead or something else.
With the TabLayout provided by the Material Components Library you can use:
the method setIcon to define the resourceId
the method setTabLabelVisibility to set the TAB_LABEL_VISIBILITY_UNLABELED.
Something like:
for (int i=0;i<tabLayout.getTabCount();i++){
tabLayout.getTabAt(i).setIcon(iconResId);
tabLayout.getTabAt(i).
setTabLabelVisibility(TabLayout.TAB_LABEL_VISIBILITY_UNLABELED);
}
The easiest way I've found to use icons is to use Tablayout.Tab.setIcon(drawable). This also makes it easy to highlight the selected icon. If you want to do this, follow these steps.
Step 1.
Add your images to the res.mipmap folders. (mipmap-mdpi, hdpi etc.) Judging by the other answers here it's also fine to put then in the res.drawable folders.
Step 2.
Call setIcon on all your tabs after setting up your TabLayout and ViewPager. I did this in my AdapterTabs to keep the Activity tidy.
So in your activity do this:
tablayout = (TabLayout) findViewById(R.id.tab_layout);
viewPager = (ViewPager) findViewById(R.id.viewPager);
adapterTabs = new AdapterTabs(this, getSupportFragmentManager(), fragments, tablayout, viewPager);
viewPager.setAdapter(adapterTabs);
tablayout.setupWithViewPager(viewPager);
adapterTabs.setTabIcons();
and in your AdapterTabs, which should extend FragmentPagerAdapter, put your setTabIcons() method.
public void setTabTitlesToIcons() {
Drawable icon1 = context.getResources().getDrawable(R.mipmap.ic_1);
Drawable icon2 = context.getResources().getDrawable(R.mipmap.ic_2);
Drawable icon3 = context.getResources().getDrawable(R.mipmap.ic_3);
Drawable icon1Hilighted = context.getResources().getDrawable(R.mipmap.ic_1_selected);
Drawable icon2Hilighted = context.getResources().getDrawable(R.mipmap.ic_2_selected);
Drawable icon3Hilighted = context.getResources().getDrawable(R.mipmap.ic_3_selected);
icons.add(icon1);
icons.add(icon2);
icons.add(icon3);
iconsHilighted.add(icon1Hilighted);
iconsHilighted.add(icon2Hilighted);
iconsHilighted.add(icon3Hilighted);
for(int i = 0; i < icons.size(); i++) {
if(i == 0) {
//noinspection ConstantConditions
tabLayout.getTabAt(i).setIcon(iconsSelected.get(i));
}
else {
//noinspection ConstantConditions
tabLayout.getTabAt(i).setIcon(icons.get(i));
}
}
}
Make sure to store a reference to the two lists 'icons' and 'iconsHilighted'. You'll need them later. Also store a reference to the TabLayout and the ViewPager which you passed in from the activity.
Step 3.
Make sure AdapterTabs.getPageTitle() returns null.
At this point, if you run it you should see that the first icon is highlighted.
Step 4.
Implement ViewPager.OnPageChangeListener in AdapterTabs and add that listener to your viewPager
public AdapterTabs(Context context, FragmentManager fragmentManager, List<Fragment> fragments, TabLayout tabLayout, ViewPager viewPager) {
super(fragmentManager);
this.context = context;
this.tabLayout = tabLayout;
this.viewPager = viewPager;
this.viewPager.addOnPageChangeListener(this);
tabs.add(fragments.get(0));
tabs.add(fragments.get(1));
tabs.add(fragments.get(2));
}
Step 5.
Update the icons in the tabs in the onPageSelected callback in your AdapterTabs.
#Override
public void onPageSelected(int position) {
for (int i = 0; i < tabs.size(); i++) {
if(i == position) {
//noinspection ConstantConditions
tabLayout.getTabAt(i).setIcon(iconsSelected.get(i));
}
else {
//noinspection ConstantConditions
tabLayout.getTabAt(i).setIcon(icons.get(i));
}
}
}
Now you should see the hilighted icon being updated when you change tabs.
Try this this will definitely work .
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.single,
R.drawable.multiple};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_picker);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("Choose contact");
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
tab();
}
public void tab(){
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new Login());
adapter.addFragment(new Register());
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment) {
mFragmentList.add(fragment);
}
}
As mentioned in the comments, defining the icons in the TabLayout does not work when using a PagerAdapter. For those using Kotlin, one workaround is to create an extension function like this:
fun TabLayout.setupWithViewPagerAndKeepIcons(viewPager : ViewPager?) {
val icons = mutableListOf<Drawable?>()
repeat(tabCount) {
icons.add(getTabAt(it)?.icon)
}
setupWithViewPager(viewPager)
repeat(tabCount) {
getTabAt(it)?.setIcon(icons.get(it))
}
}
Then in the layout.xml add your icons to the TabLayout:
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout">
<com.google.android.material.tabs.TabItem
android:icon="#drawable/your_icon"/>
</com.google.android.material.tabs.TabLayout>
Finally, use the extension function to setup the TabLayout with a ViewPager.
tab_layout.setupWithViewPagerAndKeepIcons(view_pager)
the simplest way is create new table by setting Icon on tablayout. below code will create two tab with icon only. use this code on onCreate() method
tablayout = (TabLayout) findViewById(R.id.order_tablayout);
tablayout.addTab( tablayout.newTab().setIcon(getResources().getDrawable(R.mipmap.ic_shopping_cart_white_24dp)) );
tablayout.addTab( tablayout.newTab().setIcon(getResources().getDrawable(R.mipmap.ic_like2_fille_white_24dp)) );
Using a ViewPager. This is how I have a tab with an icon only and no text.
TabLayout tabs...
TabLayout.Tab tab = tabs.getTabAt(0);
tab.setText("");
tab.setIcon(R.drawable.yourIcon);
This may not be the best answer for all cases, but what I found did not solve my problem yet.
After having a look at Androids implementation of tabLayout.setupWithViewPager(ViewPager pager) I came up with a solution using just listeners.
The layout structure:
| LinearLayout (vertical)
|-- TabLayout (width: match_parent)
|---- TabItem (without text, just icons)
|---- TabItem
|---- ...
|-- ViewPager
Code for the both listeners:
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
pager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
tabLayout.setScrollPosition(position, positionOffset, false);
}
#Override
public void onPageSelected(int position) {
TabLayout.Tab tab = tabLayout.getTabAt(position);
if (tab != null) {
tab.select();
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
Have a look at the tabLayout.setScrollPosition call inside OnPageChangeListener.onPageScrolled for the more or less good moving of the indicator while scrolling.
This may not work if the TabLayout's width is not set to match_parent (or must be scrollable).
I'm working on my 1st android project, which uses a tab layout. I want to keep track of the active tab and change a textview present in the appbar (main activity).
Here is my main activity, tab manager, and a fragment
MAIN ACTIVITY
private static final String TAG = "MainActivity";
private SectionsPageAdapter mSectionsPageAdapter;
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSectionsPageAdapter = new SectionsPageAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
setupViewPager(mViewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.Tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.tab_rooms_24dp);
tabLayout.getTabAt(1).setIcon(R.drawable.tab_feed_24dp);
tabLayout.getTabAt(2).setIcon(R.drawable.tab_profile_24dp);
tabLayout.getTabAt(0).getIcon().setColorFilter(getResources().getColor(R.color.Accent), PorterDuff.Mode.SRC_IN);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
tab.getIcon().setColorFilter(getResources().getColor(R.color.Accent),PorterDuff.Mode.SRC_IN);
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
tab.getIcon().clearColorFilter();
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void setupViewPager(ViewPager viewPager){
SectionsPageAdapter adapter = new SectionsPageAdapter(getSupportFragmentManager());
adapter.addFragment(new Tab1Fragment(), "");
adapter.addFragment(new Tab2Fragment(), "");
adapter.addFragment(new Tab3Fragment(), "");
viewPager.setAdapter(adapter);
}
TAB MANAGER
private final List<Fragment> mFragmentList =new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public void addFragment(Fragment fragment, String title){
mFragmentList.add(fragment);
mFragmentTitleList.add(title );
}
public SectionsPageAdapter(FragmentManager fm) {
super(fm);
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
FRAGMENT
private static final String TAG = "Tab3Fragment";
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_tab1,container,false);
return view;
}
I tried creating a variable in an abstract class then extending it into all three of these scripts which would be a simple solution but fragments dont seem to work well with extending, not to mention that probably isnt the most efficient method.
So I'm thinking the best method would be to simply handle it from the SectionsPageManager script?
Use addOnPageChangeListener on you pager.
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if (position == 1) {
setTitle("Tab 1");
} else if (position == 2)
{
setTitle("Tab 2");
}
else
{
setTitle("Home");
}
}
So I got it worked out and figured I'd come post the answer for anyone who may need it.
Not that the above answer sets the app title, not a TextView withing the appbar as stated in the question.
private static final String TAG = "MainActivity";
private SectionsPageAdapter mSectionsPageAdapter;
private ViewPager mViewPager;
private TextView activeTab;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
activeTab = (TextView)findViewById(R.id.PageTitle);
mSectionsPageAdapter = new SectionsPageAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
setupViewPager(mViewPager);
}
private void setupViewPager(ViewPager viewPager)
{
SectionsPageAdapter adapter = new SectionsPageAdapter(getSupportFragmentManager());
adapter.addFragment(new Tab1Fragment(), "");
adapter.addFragment(new Tab2Fragment(), "");
adapter.addFragment(new Tab3Fragment(), "");
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { }
#Override
public void onPageSelected(int position)
{
switch (position){
case 0: activeTab.setText("text");
break;
case 1: activeTab.setText("better text");
break;
case 2: activeTab.setText("best text");
break;
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
}
I'm developing an app which counts number of times the app goes to the background. It also retains the values when the orientation is changed. Though I have it working of all use cases, I have one use case which does not work.
Case : When I press the home button, change the phone's orientation and reopen the app, It does open in landscape mode but, the background count does not increase.
I have tried setting values in all the life cycle methods. It doesn't work. Hope somebody can help me with this.
`
public class MainActivity extends AppCompatActivity {
private int clickCount =0, backgroundCount = 0;
TextView tvClickCountValue, tvBackgroundCountValue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if( savedInstanceState != null){
clickCount = savedInstanceState.getInt("COUNT");
backgroundCount = savedInstanceState.getInt("BGCOUNT");
}
setContentView(R.layout.activity_main);
tvClickCountValue = (TextView) this.findViewById(R.id.tvClickCountValue);
tvBackgroundCountValue = (TextView) this.findViewById(R.id.tvBackgroundCountValue);
setView(MainActivity.this);
}
public void onClick(View v){
clickCount += 1;
tvClickCountValue.setText(Integer.toString(clickCount));
}
public void setView(Context ctx){
tvClickCountValue.setText(Integer.toString(clickCount));
tvBackgroundCountValue.setText(Integer.toString(backgroundCount));
}
#Override
protected void onStop() {
super.onStop();
backgroundCount += 1;
}
#Override
protected void onResume() {
super.onResume();
tvClickCountValue.setText(Integer.toString(clickCount));
tvBackgroundCountValue.setText(Integer.toString(backgroundCount));
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("COUNT", clickCount);
outState.putInt("BGCOUNT", backgroundCount);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
clickCount = savedInstanceState.getInt("COUNT");
backgroundCount = savedInstanceState.getInt("BGCOUNT");
}
}
This article contains useful information: https://developer.android.com/guide/topics/resources/runtime-changes.html especially in the section about Handling The Change.
Try handling it on onConfigurationChanged() of you have disabled Activity restarts on orientation changes. Otherwise, probably through this article you will find which case applies to your scenario.
By reading the problem description, I am assuming that if you don't rotate the device the application works as intended.
you need to persist the count in the SharedPreferences. each time you reopen the app read the last value from the SharedPreferences. And increment and save to SharedPreferences each time the app is hidden.
Then you can count the with #kiran code:
public class BaseActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
public static boolean isAppInFg = false;
public static boolean isScrInFg = false;
public static boolean isChangeScrFg = false;
#Override
protected void onStart() {
if (!isAppInFg) {
isAppInFg = true;
isChangeScrFg = false;
onAppStart();
}
else {
isChangeScrFg = true;
}
isScrInFg = true;
super.onStart();
}
#Override
protected void onStop() {
super.onStop();
if (!isScrInFg || !isChangeScrFg) {
isAppInFg = false;
onAppPause();
}
isScrInFg = false;
}
public void onAppStart() {
// app in the foreground
// show the count here.
}
public void onAppPause() {
// app in the background
// start counting here.
}
}
I'm new to Android Studio and currently working on my first app. Thanks to numerous examples on here i have managed to catch up on the basics very quickly. I now have a problem with my autocompletetextview, i want to get the text selected then use it in a if statement to determine what is shown on the "results" textview. The if statement works fine but only for the "else" part and i can't figure out where i went wrong.
I have commented out the onItemClickListener because the "testfoodph" method does the same.
Here is the activity code:
public class phTester extends AppCompatActivity {
Intent intent = getIntent();
AutoCompleteTextView text;
MultiAutoCompleteTextView text1;
TextView results;
String foodies;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ph_tester);
String[] foods = getResources().getStringArray(R.array.foodlist);
text=(AutoCompleteTextView)findViewById(R.id.autoCompleteTextView);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,foods);
text.setAdapter(adapter);
text.setThreshold(1);
results=(TextView)findViewById(R.id.phResults);
foodies = text.getText().toString();
text.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//if (foodies.equalsIgnoreCase("Mango")) {
//results.setText(getString(R.string.phAlk));
}
//else {
//results.setText(getString(R.string.Error));
//}
//}
});
}
public void TestFoodPH(View view) {
if (foodies.equalsIgnoreCase("Mango")) {
results.setText(getString(R.string.phAlk));
}
else {
results.setText(getString(R.string.Error));
}
}
I'm trying to build a swipe tabs view by using fragment activity and actionbar.tablistener. I have referenced other people tutorial and do it, however, it keep on deprecated and do not successful run it. Then I changed to AppComBatActivity and it do not works, show viewgroup error which I don't know why. THen I changed to ActionBarActivity, it worked finally, but no matter how I edit my tab activity, in java class and xml too, it does not show anything.
I have actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS) deprecated as well.
I have attached my code as following...
fragmentmenu.class
public class FragmentMenu extends FragmentActivity implements ActionBar.TabListener {
ActionBar actionBar;
ViewPager viewPager;
FragmentPageAdapter ft;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_menu);
viewPager = (ViewPager)findViewById(R.id.pager);
ft = new FragmentPageAdapter(getSupportFragmentManager());
actionBar = getActionBar();
viewPager.setAdapter(ft);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.addTab(actionBar.newTab().setText("Menu").setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("Report").setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("Setting").setTabListener(this));
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
}
</code>
FragmentPagerAdapter
<code>
public class FragmentPageAdapter extends FragmentPagerAdapter {
public FragmentPageAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
return new MyActivity();
case 1:
return new Report();
case 2:
return new Setting();
}
return null;
}
#Override
public int getCount() {
return 3;
}
}
</code>
One of the fragment
<code>
public class Report extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.report, container, false);
}
}
}}
Please help!
ActionBar.Tablistener is deprecated. You need to use the TabLayout instead.
Check this tutorial for more infos :
http://www.androidhive.info/2015/09/android-material-design-working-with-tabs/