ViewPager not showing anything - android

ViewPager not showing anything - android - android

I need some advice. ViewPager showing just white page. I have searched much, but I couldn't find solution for my case.
I tried to make simple button, but I got same output. I think it's not image problem.
Here's my code.
public class IntroduceArticleFragment extends Fragment {
View view;
String depart;
String path;
int num;
CustomPagerAdapter customPagerAdapter;
ViewPager viewPager;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_introduce_article, container, false);
view.setBackgroundColor(Color.WHITE);
depart = getArguments().getString("depart");
create();
//customPagerAdapter = new CustomPagerAdapter(getActivity());
viewPager = (ViewPager)view.findViewById(R.id.pager);
viewPager.setAdapter(customPagerAdapter);
return view;
}
void create(){
DBHelper dbHelper = new DBHelper(getActivity());
path = dbHelper.getContentsPath(depart);
num = dbHelper.getNum(depart);
customPagerAdapter = new CustomPagerAdapter(getActivity());
customPagerAdapter.mResources = new int[num];
for(int i=0;i<num;i++) {
String uri = "#drawable/" + path + "_" + Integer.toString(i);
int imageResource = getActivity().getResources().getIdentifier(uri, "drawabale", getActivity().getPackageName());
customPagerAdapter.mResources[i] = imageResource;
}
}
}
public class CustomPagerAdapter extends PagerAdapter {
Context mContext;
public int[] mResources;
public CustomPagerAdapter(Context context) {
super();
mContext = context;
}
#Override
public int getCount() {
return mResources.length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == ((LinearLayout) object);
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
LayoutInflater mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = mLayoutInflater.inflate(R.layout.pager_item_0, container, false);
ImageView imageView = (ImageView) itemView.findViewById(R.id.pagerimageView_0);
imageView.setImageResource(mResources[position]);
container.addView(itemView);
return itemView;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((LinearLayout) object);
}
#Override
public void startUpdate(ViewGroup container) {
super.startUpdate(container);
}
#Override
public void finishUpdate(ViewGroup container) {
super.finishUpdate(container);
}
}
and here's xml code for ArticleFragment
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
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.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:visibility="visible">
</android.support.v4.view.ViewPager>
</LinearLayout>
</ScrollView>
</LinearLayout>
and here's xml code for
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:text="Button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/button" />
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitCenter"
android:id="#+id/pagerimageView_0" />
</LinearLayout>

Ok... First of all you must set the android:layout_height of the ScrollView's child to wrap_content.
Second, Consider that you can't set android:layout_height of ViewPager to wrap_content. Unless you use a custom ViewPager. For Example you can check this answer
By setting android:fillViewport to true in ScrollView, The height of ScrollView's Child automatically will set to match_parent until its height become taller than screen.
And I don't get it why you set the height of ViewPager to 0dp and expect that it shows something!
Now your layout should be like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<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_pranet"
android:visibility="visible">
</android.support.v4.view.ViewPager>
</LinearLayout>
</ScrollView>
</LinearLayout>

I've spent half of day solving it and gets that my ViewPager have the same id with another ViewPager in another module in my app, so I've simply gave it another id.

You Have got it all wrong, use this code
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
public class CustomPagerAdapter extends FragmentStatePagerAdapter {
public int[] mResources;
public NewsAdapter(FragmentManager fm, int[] mResources) {
super(fm);
this.mNumOfTabs = mResources.length();
this.mResources = mResources;
}
#Override
public Fragment getItem(int position) {
return ContentFragment.newInstance(mResources[position]);
}
#Override
public int getCount() {
return mNumOfTabs;
}
}
public class ContentFragment extends Fragment {
private Context context;
private int resource_id;
public static ContentFragment newInstance(int resourdid) {
Bundle args = new Bundle();
args.putInt("resource_id", resourdid);
ContentFragment fragment = new ContentFragment();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
resource_id = getArguments().getInt("resource_id");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(in.newswallet.R.layout.content_row, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
initalize();
}
private void initalize(){
View itemView = getView();
ImageView imageView = (ImageView) itemView.findViewById(R.id.pagerimageView_0);
imageView.setImageResource(resource_id);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.context=context;
}
}

<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="0dp"
android:visibility="visible">
</android.support.v4.view.ViewPager>
try to change the android:layout_height = "0dp" to some value like android:layout_height = "50dp" or
give weight to the layout
android:layout_weight = "1"

Change:
container.removeView((LinearLayout) object);
With:
container.removeView((ConstraintLayout) object);

Related

Android launch a fragment within a dialog fragment

I have a dialog fragment and I need to launch a fragment within this dialog fragment. This means my fragment should occupy the same window as that of dialog fragment. How do I do this? This is my dialog fragment code -
public class CallDialogFragment extends DialogFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.call_dialog_fragment, container, false);
return view;
}
}

Just use fragment transaction and add another dialog fragment. and add to back stack.

you can use coordinator layout for dialog-fragment.. when you drag layout to upper side it will be your new fragment. and when you drag to down it will be your dialog fragment.
here is the xml code..
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="#+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.design.widget.AppBarLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="#dimen/detail_backdrop_height"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true"
>
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
local:contentScrim="?attr/colorPrimary"
local:expandedTitleMarginEnd="64dp"
local:expandedTitleMarginBottom="22dp"
local:expandedTitleMarginStart="20dp"
local:expandedTitleTextAppearance="#style/TextAppearance.AppCompat.Title"
local:layout_scrollFlags="scroll|exitUntilCollapsed">
<ProgressBar
android:id="#+id/progressfull"
android:visibility="visible"
android:layout_width="match_parent"
android:layout_marginTop="80dp"
android:layout_height="24dp" />
<ImageView
android:id="#+id/image_preview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
local:layout_collapseMode="parallax"
/>
<View
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
android:layout_alignBottom="#+id/image_preview"
android:background="?attr/colorPrimary"
local:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
local:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbarIcon"
android:layout_height="?attr/actionBarSize"
android:layout_width="match_parent"
local:popupTheme="#style/ThemeOverlay.AppCompat.Light"
local:layout_collapseMode="pin"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/addbtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
local:borderWidth="0dp"
android:layout_marginRight="#dimen/fab_margin"
android:layout_marginLeft="#dimen/fab_margin"
android:layout_marginTop="#dimen/fab_margin"
android:layout_marginBottom="25dp"
android:src="#drawable/ic_add" />
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
android:background="#color/colorPrimaryDark"
local:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="24dp">
<android.support.v7.widget.CardView
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>
fragment_image_slider.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
</LinearLayout>
here is the java code..
public class SlideshowDialogFragment extends DialogFragment {
private String TAG = SlideshowDialogFragment.class.getSimpleName();
private ArrayList<ItemCategories> images;
private ViewPager viewPager;
private MyViewPagerAdapter myViewPagerAdapter;
private String lblCount, lblTitle, lblDate;
private int selectedPosition = 0;
private CardView cardView;
private Context mContext;
public static SlideshowDialogFragment newInstance() {
SlideshowDialogFragment fragmentFullScreen = new SlideshowDialogFragment();
return fragmentFullScreen;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_image_slider, container, false);
viewPager = (ViewPager) v.findViewById(R.id.viewpager);
setHasOptionsMenu(true);
ViewCompat.setOnApplyWindowInsetsListener(viewPager,
new OnApplyWindowInsetsListener() {
#Override
public WindowInsetsCompat onApplyWindowInsets(View v,
WindowInsetsCompat insets) {
insets = ViewCompat.onApplyWindowInsets(v, insets);
if (insets.isConsumed()) {
return insets;
}
boolean consumed = false;
for (int i = 0, count = viewPager.getChildCount(); i < count; i++) {
ViewCompat.dispatchApplyWindowInsets(viewPager.getChildAt(i), insets);
if (insets.isConsumed()) {
consumed = true;
}
}
return consumed ? insets.consumeSystemWindowInsets() : insets;
}
});
images = (ArrayList<ItemCategories>) getArguments().getSerializable("images");
selectedPosition = getArguments().getInt("position");
Log.e(TAG, "position: " + selectedPosition);
Log.e(TAG, "images size: " + images.size());
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
setCurrentItem(selectedPosition);
getArguments().remove("position");
getArguments().remove("images");
return v;
}
private void setCurrentItem(int position) {
viewPager.setCurrentItem(position, false);
displayMetaInfo(selectedPosition);
}
// page change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
displayMetaInfo(position);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
};
private void displayMetaInfo(int position) {
lblCount = (position + 1) + " of " + images.size();
ItemCategories image = images.get(position);
lblTitle = "" + image.getCategoryItem();
lblDate = "" + image.getUrlThumb();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setStyle(DialogFragment.STYLE_NORMAL, R.style.MyMaterialThemeFull);
}
#Override
public void onDetach() {
super.onDetach();
}
// adapter
public class MyViewPagerAdapter extends PagerAdapter {
private LayoutInflater layoutInflater;
public MyViewPagerAdapter() {
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(R.layout.image_fullscreen_preview, container, false);
ImageView imageViewPreview = (ImageView) view.findViewById(R.id.image_preview);
Toolbar toolbarIcon = (Toolbar) view.findViewById(R.id.toolbarIcon);
((AppCompatActivity) getActivity()).setSupportActionBar(toolbarIcon);
((AppCompatActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
CollapsingToolbarLayout collapsingToolbar =
(CollapsingToolbarLayout) view.findViewById(R.id.collapsing_toolbar);
AppBarLayout appBarLayout = (AppBarLayout) view.findViewById(R.id.appbar);
DisplayMetrics displaymetrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int screenHeight = displaymetrics.heightPixels;
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams)appBarLayout.getLayoutParams();
lp.height = screenHeight;
toolbarIcon.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Fragment prev = getActivity().getSupportFragmentManager().findFragmentByTag("slideshow");
if (prev != null) {
DialogFragment dialogFullScreen = (DialogFragment) prev;
dialogFullScreen.dismiss();
}
}
});
ItemCategories image = images.get(position);
Glide.with(getActivity()).load(image.getUrlThumb())
.thumbnail(0.5f)
.crossFade()
.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(imageViewPreview);
collapsingToolbar.setTitle(lblTitle);
container.addView(view);
return view;
}
#Override
public int getCount() {
return images.size();
}
#Override
public boolean isViewFromObject(View view, Object obj) {
return view == ((View) obj);
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
}
just copy this code and you will know what i am talking about

Unwanted white space beneath ImageView in ViewPager android

I'm using ViewPager as image slider. I'm using Android Studio. Everything works fine, I can slide between images. However beneath my images I have for some reason white space. I know that you can't call wrap_content on ViewPager and I've tried to put the fragment which contains the image slider into an Activity with another fragment below the image-slider-fragment, but between them is still some weird white space and within the white space I can also swipe to another image, which would of course cause only problems later on:
fragment_home.xml:
<FrameLayout 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="HomeFragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<fragment
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:name="ImageSliderFragment"
android:id="#+id/fragment1"
tools:layout="#layout/fragment_image_slider"
android:layout_weight="2"/>
<fragment
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:name="BottomFragment"
tools:layout="#layout/fragment_bottom"
android:id="#+id/fragment2"
android:layout_weight="2"/>
</LinearLayout>
</FrameLayout>
swipe_layout.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/image_view_of_slider"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitXY"/>
<!-- adjustviewBounds prevents non-defined padding -->
<TextView
android:id="#+id/text_view_of_swipe_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"/>
</RelativeLayout>
fragment_image_slider.xml:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context="ImageSliderFragment"
android:id="#+id/image_slide_id">
<android.support.v4.view.ViewPager
android:id="#+id/view_pager_of_image_slider"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<!--height="wrap_content/match_parent" both have the same result -->
</FrameLayout>
CustomSliderAdapter.java:
public class CustomSliderAdapter extends PagerAdapter {
private int[] image_res = {R.drawable.a,R.drawable.b,
R.drawable.c, R.drawable.d};
private String[] image_names = {"a", "b", "c", "d"};
private Context ctx;
private LayoutInflater layoutInflater;
public CustomSliderAdapter(Context ctx) {
this.ctx = ctx;
}
#Override
public int getCount() {
return image_res.length;
}
#Override
public int getItemPosition(Object object) {
return super.getItemPosition(object);
}
#Override
public boolean isViewFromObject(View view, Object object) {
return (view == (RelativeLayout) object);
}
#Override
public Object instantiateItem(final ViewGroup container, final int position) {
layoutInflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(R.layout.swipe_layout, container, false);
ImageView imageView = (ImageView) view.findViewById(R.id.image_view_of_slider);
TextView textView = (TextView) view.findViewById(R.id.text_view_of_swipe_layout);
imageView.setImageResource(image_res[position]);
textView.setText(image_names[position]);
container.addView(view);
return view;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((RelativeLayout) object);
}
}
ImageSliderFragment.class:
public class ImageSliderFragment extends Fragment {
ViewPager viewPager;
CustomSliderAdapter adapter;
View myView;
public static int imageHeight;
public ImageSliderFragment() {}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if(myView==null) {
myView = inflater.inflate(R.layout.fragment_image_slider, container, false);
viewPager = (ViewPager) myView.findViewById(R.id.view_pager_of_image_slider);
adapter = new CustomSliderAdapter(getActivity());
//With this I could set height of ViewPager manually
ViewGroup.LayoutParams params = viewPager.getLayoutParams();
params.height = imageHeight;
viewPager.setLayoutParams(params);
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
viewPager.setAdapter(adapter);
} else {
((ViewGroup) myView.getParent()).removeView(myView);
}
return myView;
}
}
How activity looks
I've also tried to change the height of my xml file with numbers (f.e.200dp), which works, but there are so many different device screens that at some point it would get at some point messed up
So again my problem is: make ViewPager fit to Imageview,because I can swipe between images also in the white space.
Help is much appreciated!

You can try like this on your imageview for viewpager image ....
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY" />

Image Slider Using View Pager(With Transparent Toolbar)

I have Created an Image Slider using View Pager by following some tutorials.
So my problems is I wanted my slider to have a transparent toolbar.
And when i clicked on the screen the toolbar will hide.
Here's my code together with the output(I made), and the output i Want.
My Activity
public class viewInfo extends AppCompatActivity{
private ViewPager viewPager;
private Toolbar toolbar;
private CustomSwipeAdapter adapter;
PhotoViewAttacher mAttacher;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_info);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.view_pager);
adapter = new CustomSwipeAdapter(this);
viewPager.setAdapter(adapter);
}
public class CustomSwipeAdapter extends PagerAdapter {
private int[] image_resources = {R.drawable.bsu, R.drawable.gameover2};
private Context context;
private LayoutInflater layoutInflater;
public CustomSwipeAdapter(Context context) {
this.context = context;
}
#Override
public int getCount() {
return image_resources.length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return (view == (LinearLayout) object);
}
#Override
public Object instantiateItem(View container, int position) {
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View item_view = layoutInflater.inflate(R.layout.swipe_layout, (ViewGroup) container, false);
ImageView imageView = (ImageView) item_view.findViewById(R.id.image_view);
imageView.setPadding(5, 5, 5, 5);
imageView.setImageResource(image_resources[position]);
((ViewGroup) container).addView(item_view);
mAttacher = new PhotoViewAttacher(imageView);
mAttacher.update();
return item_view;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((LinearLayout) object);
}
}
}
2.XML(swipe_layout)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center"
android:background="#000"
>
<ImageView
android:id="#+id/image_view"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:gravity="center"
/>
</LinearLayout>
3.XML(My Activity's XML)
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFF"
android:orientation="vertical"
tools:context="com.thesis.juandirection.juandirectionfinale.viewInfos.viewInfo">
<include
android:id="#id/app_bar"
layout="#layout/app_bar" />
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
</LinearLayout>
What i want Is this effect..
Transparent toolbar.
I tried to put a listener to Linearlayout that when the user
clicked the layout it will hide the toolbar, but no luck.

Why do I can slide to more than two times while I have only two tabs on Android?

I am learning how to use navigation drawer and navigation tab. I created an app that implement a navigation drawer on MainActivity and each item on navigation drawer will replace fragment on MainActivity to the corresponding fragment.
My first fragment provide two navigation tab using SlidingTabLayout and SlidingTabStrip. The other fragments are just a textview.
If I move from the first item to the second item and then back to first item again, my tab still show two tab, but in fact, I can slide more than two times and the content is not shown.
How do I fix this?
What it should be:
After I move to second drawer and then back to first drawer:
What happened after that:
You can see that I can slide more than twice and the content of fragments are not shown.
MainActivity.java
public class MainActivity extends ActionBarActivity {
String titles[] = {"TabsFragment", "TextFragment"};
Fragment fragment[] = {TabsFragment.newInstance(), TextFragment.newInstance()};
RecyclerView mRecyclerView;
RecyclerView.Adapter mAdapter;
RecyclerView.LayoutManager mLayoutManager;
DrawerLayout drawer;
ActionBarDrawerToggle mDrawerToggle;
static View.OnClickListener drawerItemClickListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
mRecyclerView.setHasFixedSize(true);
mAdapter = new DrawerAdapter(titles);
drawerItemClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
int selectedPos = mRecyclerView.getChildPosition(v);
drawer.closeDrawers();
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_content, fragment[selectedPos])
.commit();
}
};
mRecyclerView.setAdapter(mAdapter);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(
this,
drawer,
toolbar,
R.string.open_drawer,
R.string.close_drawer) {
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
supportInvalidateOptionsMenu();
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
supportInvalidateOptionsMenu();
}
};
drawer.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_content, fragment[0])
.commit();
}
}
}
activity_main.xml
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/drawer_layout">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v7.widget.Toolbar
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:id="#+id/toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?attr/actionBarSize" />
<FrameLayout
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/toolbar"/>
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/RecyclerView"
android:layout_width="320dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#ffffff"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
</android.support.v4.widget.DrawerLayout>
TabsFragment.java
public class TabsFragment extends Fragment {
public static Fragment newInstance() {
TabsFragment fragment = new TabsFragment();
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_tabs, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
ViewPager mViewPager = (ViewPager) view.findViewById(R.id.viewpager);
mViewPager.setAdapter(new SamplePagerAdapter(getActivity().getSupportFragmentManager(), getActivity().getApplicationContext()));
SlidingTabLayout mSlidingTabLayout = (SlidingTabLayout) view.findViewById(R.id.sliding_tabs);
mSlidingTabLayout.setDistributeEvenly(true);
mSlidingTabLayout.setViewPager(mViewPager);
}
class SamplePagerAdapter extends FragmentPagerAdapter {
private String[] tabTitles = new String[] {"Tab One", "Tab Two"};
private Context context;
public SamplePagerAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
#Override
public int getCount() {
return tabTitles.length;
}
#Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
#Override
public android.support.v4.app.Fragment getItem(int position) {
android.support.v4.app.Fragment[] fragment = {TabOneFragment.newInstance(), TabTwoFragment.newInstance()};
return fragment[position];
}
}
}
fragment_tabs.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=".TabsFragment">
<android.com.drawertab.SlidingTabLayout
android:id="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/toolbar" />
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/sliding_tabs" />
</RelativeLayout>
TabsOneFragment.java
public class TabOneFragment extends Fragment{
public static TabOneFragment newInstance() {
TabOneFragment fragment = new TabOneFragment();
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_tab_one, container, false);
}
}
fragment_tabs_one.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center"
android:id="#+id/text"
android:text="TAB ONE" />
</LinearLayout>
TabsTwoFragment.java
public class TabTwoFragment extends Fragment {
public static TabTwoFragment newInstance() {
TabTwoFragment fragment = new TabTwoFragment();
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_tab_two, container, false);
}
}
fragment_tabs_two.java
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center"
android:id="#+id/text"
android:text="TAB TWO" />
</LinearLayout>
TextFragment.java
public class TextFragment extends Fragment {
public static Fragment newInstance() {
TextFragment fragment = new TextFragment();
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_text, container, false);
}
}
fragment_text.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center"
android:id="#+id/text"
android:text="FRAGMENT TEXT" />
</LinearLayout>
DrawerAdapter.java
public class DrawerAdapter extends RecyclerView.Adapter<DrawerAdapter.ViewHolder> {
private String mNavTitles[];
public static class ViewHolder extends RecyclerView.ViewHolder {
TextView textView;
public ViewHolder(View itemView,int ViewType) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.rowText);
itemView.setOnClickListener(MainActivity.drawerItemClickListener);
}
}
public DrawerAdapter(String[] titles) {
mNavTitles = titles;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.drawer_item_row, parent, false);
ViewHolder vhItem = new ViewHolder(v, viewType);
return vhItem;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.textView.setText(mNavTitles[position]);
}
#Override
public int getItemCount() {
return mNavTitles.length;
}
}
drawer_item_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:layout_height="wrap_content"
android:background="?attr/selectableItemBackground"
android:clickable="true"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="12dp"
android:paddingTop="4dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:id="#+id/rowText" />
</LinearLayout>

If you are correct about sliding more times than twice, then you need to set the override method getCount correctly (I realize you know). That's the only issue you need to worry about.
private String[] tabTitles = new String[] {"Tab One", "Tab Two"};
...
#Override
public int getCount() {
return tabTitles.length;
}
Note: I declared tabTitles differently as an array of String "String[]", widely accepted. The other style "tabTitles[]" may not work well with its methods like length.

Looking at your code more closely, I suspect objects TabOneFragment and TabTwoFragment is not working well. Normally override getItem returns the same static Fragment. And of course, I do not see that declaration or code for it.
My suggested try is (from your code):
#Override
public android.support.v4.app.Fragment getItem(int position) {
return TabsFragment.newInstance(position);
}
Note: With the above code, I don't see any use for TabOneFragment and TabTwoFragment, referenced in getItem(int position) in SamplePagerAdapter class. The TextView UI in layout fragment_tab_one.xml is only used for the tab texts. For those texts, the override getPageTitle(int position) can be used and is already coded.

ViewPager does not show content

I am trying to create a ViewPager that shows a list of ImageViews. I am able to implement the pager and adapter properly, and it works as expected on swiping. However, it does not show the content of the ImageView properly, i.e. the image itself. Its as if the images are there, but they are transparent. Only one image is visible out of the whole lot.
Here is my code-
ImagePagerAdapter.java
public class ImagePagerAdapter extends PagerAdapter {
LayoutInflater inflater;
List<ImageView> views = new ArrayList<>();
boolean[] done = {false,false,false,false,false};
ItemDetailFragment idf;
public ImagePagerAdapter(ItemDetailFragment idf,
LayoutInflater inflater) {
this.idf = idf;
this.inflater = inflater;
for (int i = 0; i < getCount(); i++) {
ImageView iv = new ImageView(idf.getActivity());
iv.setImageResource(R.drawable.light_grey_background);
views.add(iv);
}
}
public ImagePagerAdapter(LayoutInflater inflater) {
this.inflater = inflater;
for (int i = 0; i < getCount(); i++) {
ImageView iv = new ImageView(inflater.getContext());
iv.setImageResource(R.drawable.light_grey_background);
views.add(iv);
}
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
if (done[position]) {
return views.get(position);
}
ImageView v = views.get(position);
views.set(position, v);
((ViewPager) container).addView(v);
done[position] = true;
return v;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
}
#Override
public int getCount() {
return 5;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return true;
}
}
ItemDetailFragment.java : This is where I set the adapter.
public class ItemDetailFragment extends Fragment {
ViewPager pager;
ImagePagerAdapter adapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_item_detail,
container, false);
pager = (ViewPager) rootView.findViewById(R.id.pager);
adapter = new ImagePagerAdaper(this, inflater);
pager.setAdapter(adapter);
}
fragment_item_detail.xml
<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="vertical"
android:padding="16dp"
tools:context="com.trial.piclist.ItemDetailFragment" >
<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="200dip" >
</android.support.v4.view.ViewPager>
<TableRow
android:id="#+id/tableRow1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/item_title"
style="?android:attr/textAppearanceLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello"
android:textIsSelectable="true" />
<Space
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1" />
<include
android:layout_width="wrap_content"
android:layout_height="wrap_content"
layout="#layout/controls_layout" />
</TableRow>
<ScrollView
android:id="#+id/descScrollView"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/item_detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello" />
</LinearLayout>
</ScrollView>
</LinearLayout>
Please Help. Thanks.

Use:
public class ImagePagerAdapter extends PagerAdapter {
LayoutInflater Inflater;
Activity act;
int count;
public ViewPagerAdapter(Activity a, int c) {
act = a;
count=c;
Inflater = (LayoutInflater) act
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return count;
}
#Override
public Object instantiateItem(View collection, int position) {
View v1 = Inflater.inflate(R.layout.element_image, null);
ImageView image = (ImageView) v1
.findViewById(R.id.about_image);
image.setImageResource(R.drawable.light_grey_background);
((ViewPager) collection).addView(v1, 0);
return v1;
}
#Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
#Override
public Parcelable saveState() {
return null;
}
}
Make a layout element_image.xml:
<?xml version="1.0" encoding="utf-8"?>
<ImageView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/smv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
Replace
adapter = new ImagePagerAdaper(this, inflater);
with
adapter = new ImagePagerAdaper(getActivity(), count_of_images);

initiate the ImageView in the instantiateItem() method, set the LayoutParams of the imageView
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
imageView.setLayoutParams(params);
Also set the bg colour for debugging
imageView.setBackgroundColor(Color.GREEN);
viewPager.setBackgroundColor(Color.RED);

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

ViewPager not showing anything - android - android

I've spent half of day solving it and gets that my ViewPager have the same id with another ViewPager in another module in my app, so I've simply gave it another id.

Change: container.removeView((LinearLayout) object); With: container.removeView((ConstraintLayout) object);

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Why do I can slide to more than two times while I have only two tabs on Android?

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