Develop Reference

Pager adapter with private methods without fragments in android

Is it possible to user View pager without fragments. I google it, and all examples use fragments for view pager. I want to pager load only one item from my list, so I want to ask is it possible. Here is my code for main activity, and I want to use UpdateDisplay for viewpager. Any suggestions.
public class MainActivity extends Activity implements OnClickListener{
private Button prev, next;
private TextView tv;
private int number = 0;
private ArrayList<Integer> numbers;
private ViewPager pager;
private MyPagerAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prev = (Button) findViewById(R.id.prevButton);
prev.setOnClickListener(this);
next = (Button) findViewById(R.id.nextButton);
next.setOnClickListener(this);
numbers = new ArrayList<Integer>();
for (int i=0;i<5;i++){
numbers.add(i);
Log.i("Sljedece elemente dodaje u listu", String.valueOf(i));
}
tv = (TextView) findViewById(R.id.rezultatTextView);
pager = (ViewPager) findViewById(R.id.pager);
adapter = new MyPagerAdapter();
pager.setAdapter(adapter);
updateDIsplay(number);
}
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.prevButton:
number--;
if (number==-1){
number = 4;
}
updateDIsplay(number);
break;
case R.id.nextButton:
number++;
if (number==5){
number = 0;
}
updateDIsplay(number);
break;
}
}
private void updateDIsplay(int z){
tv.setText(String.valueOf(numbers.get(z)));
}
private class MyPagerAdapter extends PagerAdapter{
#Override
public int getCount() {
return numbers.size();
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return false;
}
}
}

yes it possible. Use a PageAdapter. When instantiateItem is called, you can inflate/instantiate your view, and this to the container. E.g:
private class MyPagerAdapter extends PagerAdapter {
#Override
public Object instantiateItem(ViewGroup container, int position) {
TextView view = new TextView(PagerActivity.this);
view.setText("Item "+position);
view.setGravity(Gravity.CENTER);
view.setBackgroundColor(Color.argb(255, position * 50, position * 10, position * 50));
container.addView(view);
return view;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View)object);
}
#Override
public int getCount() {
return 5;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return (view == object);
}
}

Android viewpager pagertitlestrip click by position

I'm working viewpager and pagertitlestrip.i successfully created it and i wan add views in my viewpager.this is a my source
private ViewPager mViewPager;
TextView text;
private PagerTitleStrip mPagerTitleStrip;
View view1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
mViewPager = (ViewPager)findViewById(R.id.viewpager);
mPagerTitleStrip = (PagerTitleStrip)findViewById(R.id.pagertitle);
//View
LayoutInflater mLi = LayoutInflater.from(this);
view1 = mLi.inflate(R.layout.activity_main, null);
text=(TextView)view1.findViewById(R.id.textView1);
//Title
final ArrayList<View> views = new ArrayList<View>();
final ArrayList<String> titles = new ArrayList<String>();
for (int i = 0; i < 10; i++) {
view1 = mLi.inflate(R.layout.activity_main, null);
text=(TextView)view1.findViewById(R.id.textView1);
text.setText("Page"+i);
views.add(view1);
titles.add("title"+i);
}
mPagerTitleStrip.setTextColor(Color.BLUE);
//ViewPager
PagerAdapter mPagerAdapter = new PagerAdapter() {
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
#Override
public int getCount() {
return views.size();
}
#Override
public void destroyItem(View container, int position, Object object) {
((ViewPager)container).removeView(views.get(position));
}
#Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}
#Override
public Object instantiateItem(View container, int position) {
((ViewPager)container).addView(views.get(position));
return views.get(position);
}
};
mViewPager.setAdapter(mPagerAdapter);
}
}
now i try to write pagertitlestrip's onclicklistener.for more information,if i click 4's title i would to start(show) 4th view.onclick listener by position
how i can solve my problem?
if anyone knows solution please help me

If you want to set view manually by tapping on some indicator the you can use this
mViewPager.setCurrentItem(num);
but if you want to do something when some page is selected the you can use
ViewPager.SimpleOnPageChangeListener
for the listener understanding you can follow this
ViewPager.SimpleOnPageChangeListener
Hope this will help

How can i getCurrentView by position in a ViewPager?

I need getCurrentView by position in a ViewPager
This my ViewPagerAdapter
public class TutorialViewPagerAdapter extends ViewPagerAdapter {
private LayoutInflater mInflater;
private View view;
private List<Integer> views;
public TutorialViewPagerAdapter(Activity act, List<Integer> views) {
super(act, null);
this.views = views;
this.mInflater = LayoutInflater.from(this.activity);
}
#Override
public void destroyItem(View container, int arg1, Object view) {
((ViewPager) container).removeView((View) view);
}
#Override
public int getCount() {
return views.size();
}
#Override
public Object instantiateItem(ViewGroup collection, int position) {
int viewId = (Integer) views.get(position);
this.view = mInflater.inflate(viewId, null);
((ViewPager) collection).addView(view);
return view;
}
}
And this is my activity
public class Tutorial extends FragmentActivity implements
ViewPager.OnPageChangeListener {
private List<Integer> views;
private TutorialViewPagerAdapter viewPagerAdapter;
private ViewPager viewPager;
private CirclePageIndicator circlePageIndicator;
private int currentViewId;
private View currentView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tutorial);
init();
}
private void init() {
views = new ArrayList<Integer>();
views.add(R.layout.tutorial_step_one);
views.add(R.layout.tutorial_step_two);
views.add(R.layout.tutorial_step_three);
views.add(R.layout.tutorial_step_four);
views.add(R.layout.tutorial_step_five);
viewPagerAdapter = new TutorialViewPagerAdapter(this, views);
viewPager = (ViewPager) findViewById(R.id.steps_view_pager);
circlePageIndicator = (CirclePageIndicator) findViewById(R.id.steps_indicator);
viewPager.setAdapter(viewPagerAdapter);
viewPager.setCurrentItem(0, false);
circlePageIndicator.setViewPager(viewPager);
circlePageIndicator.setCentered(true);
circlePageIndicator.setPadding(20, 20, 20, 20);
circlePageIndicator.notifyDataSetChanged();
circlePageIndicator.setCurrentItem(0);
viewPager.setOnPageChangeListener(this);
}
#Override
public void onPageScrollStateChanged(int state) {
int currentPosition = viewPager.getCurrentItem();
circlePageIndicator.setCurrentItem(currentPosition);
enableStep(currentPosition);
}
private void enableStep(int currentPosition) {
/*viewPagerAdapter.getItemPosition(object)
currentView = viewPager.getChildAt(viewPager.getRootView());
Log.d("DEBUG", currentView.toString() + " CURRENT VIEW");*/
}
#Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
}

You could add all your created views in instantiateItem to an ArrayList<View> and then make a public method for getting a view from the ArrayList with get(position). But be carefully, as soon the Activity is finished the views could be null

Instead of ViewPagerAdapter you can use FragmentPagerAdapter which will have getItem(int position) method by using which you can easily access view.
You can take a look at this post : Android Return back to same fragment after click on goto first fragment in view pager
Hope this help!!

It's moot point. What exactly You need? Current view or view by position. Imho it is different things.
Current view:
currentView = viewPager.getCurrentItem();
Or view by index (you pass wrong parameter - should be int):
currentView = viewPager.getChildAt(currentPosition);

Calling a Button Click Listener in View Pager android

I am using a View pager for sliding pages in android, all of my pages have button and i want to set on click listeners on the buttons. how can i do this? i checked this link. On Click listener is not working in View Pager but it did not work for me.
here is my code:
Main.class
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyPagerAdapter adapter = new MyPagerAdapter();
ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(2);
Button btnDone = (Button) findViewById(R.id.buttonalpha);
btnDone.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "clicked", Toast.LENGTH_SHORT).show();
}
});
}
#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;
}
}
ViewPager
public class MyPagerAdapter extends PagerAdapter {
public int getCount() {
return 3;
}
public Object instantiateItem(View collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = 0;
switch (position) {
case 0:
resId = R.layout.hello;
break;
case 1:
resId = R.layout.hello2;
break;
case 2:
resId = R.layout.hello3;
break;
/*case 3:
resId = R.layout.right;
break;
case 4:
resId = R.layout.farright;
break;*/
}
View view = inflater.inflate(resId, null);
((ViewPager) collection).addView(view, 0);
return view;
}
#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;
}
}
Any help would be appreciated.

I think it would be better to use FragmentPagerAdapter.
Example of fragment.
public class YourFragment extends Fragment {
private OnClickListener mListener;
public static YourFragment newInstance(int layoutId){
Bundle args = new Bundle();
args.putInt("id", layoutId);
YourFragment fr = new YourFragment();
fr.setArguments(args);
return fr;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
mListener = (OnClickListener)activity;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(getArguments().getInt("id"), container, false);
view.findViewById(R.id.action_bar).setOnClickListener(mListener);
return view;
}
}
mainActivity should imlement OnClickListener.
Watch http://developer.android.com/guide/components/fragments.html#CommunicatingWithActivity

Button in ViewPager scroll to specific page

One of my layouts inside of my ViewPager has a button. "R.layout.add_site". I would like the option of hitting the button and it scroll to the specific page for me. I already have the option to swipe to the specific page, but I would like to have both.
Now I'm sure there's a way to do that, but for some reason, I cannot figure it out.
You'll see that I've made an attempt , but just dont know what method to call in order to make it scroll to the desired page. Which is R.layout.main.
Here's my code.
public class fieldsActivity extends Activity {
Button addSiteButton;
Button cancelButton;
Button signInButton;
/**
* Called when the activity is first created.
*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// to create a custom title bar for activity window
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.fields);
// use custom layout title bar
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.topbar);
Pager adapter = new Pager();
ViewPager mPager = (ViewPager) findViewById(R.id.fieldspager);
mPager.setAdapter(adapter);
mPager.setCurrentItem(1);
addSiteButton = (Button) findViewById(R.id.addSiteButton);
addSiteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Don't know what method to call!?
}
});
cancelButton = (Button) findViewById(R.id.cancel_button);
signInButton = (Button) findViewById(R.id.sign_in_button);
}
private class Pager extends PagerAdapter {
public int getCount() {
return 3;
}
#Override
public Object instantiateItem(View collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = 0;
switch (position) {
case 0:
resId = R.layout.field01;
break;
case 1:
resId = R.layout.add_site;
break;
case 2:
resId = R.layout.main;
break;
}
View view = inflater.inflate(resId, null);
((ViewPager) collection).addView(view, 0);
return view;
}
#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;
}
}
}
Any help is appreciated!

call :
mPager.setCurrentItem(2);
in your onClick() method, or for a smoother scroll:
mPager.setCurrentItem(2, true);

I can't really answer WHY exactly this happens, but if you delay the setCurrentItem call for a few milliseconds it should work. My guess is that because during onResume there hasn't been a rendering pass yet, and the ViewPager needs one or something like that.
private ViewPager viewPager;
#Override
public void onResume() {
final int pos = 3;
viewPager.postDelayed(new Runnable() {
#Override
public void run() {
viewPager.setCurrentItem(pos);
}
}, 100);
}
Original Answer: here