View Pager Code Not Working

[Kishor Joshi]

Hi there


Here is I am using ViewPager in android.I want when a User clicke on A picture then a Intent will open.But Know when i Scroll from one activity to another The Intent is calling This is my code

adapter=new MyAdapter();
        pager = (ViewPager) findViewById(R.id.view_Pager);
		pager.setAdapter(adapter);
		
		pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
			
			@Override
			public void onPageSelected(int position) {
				// TODO Auto-generated method stub

				
			}
			
			@Override
			public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
				// TODO Auto-generated method stub
int pos=Integer.parseInt(String.valueOf(position));
				
				if(pos==1)
				{
					Intent i1=new Intent(MainActivity.this,FirstActivity.class);
					startActivity(i1);
				}
				
				if(pos==2)
				{
					Intent i2=new Intent(MainActivity.this,SecondActivity.class);
					startActivity(i2);
				}
				
				if(pos==3)
				{
					Intent i3=new Intent(MainActivity.this,ThirdActivity.class);
					startActivity(i3);
				}
				
				if(pos==4)
				{
					Intent i4=new Intent(MainActivity.this,FourthActivity.class);
					startActivity(i4);
				}
				
				if(pos==5)
				{
					Intent i5=new Intent(MainActivity.this,FifthActivity.class);
					startActivity(i5);
				}
				
			}
			
			@Override
			public void onPageScrollStateChanged(int position) {
				// TODO Auto-generated method stub
				
				
				
			}
		});

What Else i Need to change in My Code that When a user Clicks on A Particulr Image then Only the Intent Will open Not in Scrolling?


Thanks

[Ulf Dittmer]

Why are you overriding onPageScrolled if what you really want is to detect clicks?

[Kishor Joshi]

I want that If Someone Clicks on a particular Image then Information about that Image will display...
So I want to start a New InfoActivity There


Any More Clarfication?

[Ulf Dittmer]

I understood. To phrase it differently: Does "onPageScolled" sound to you like a callback to detect a click? Or might there be some other callback better suited for that purpose?

[Kishor Joshi]

I want to detect some click when a User clicks on a Particular Image Not in all Images?


So what should I do?

[Ulf Dittmer]

Use a callback that triggers only if that image is clicked. That probably means attaching the listener to the View that holds the image, not to the ViewPager.

[Kishor Joshi]

I don't get full Point How to use callback?


Can you clear it some more or can you give a link or Source of Callbacks in Other Views in Android?

[Ulf Dittmer]

The callbacks here are the methods defined by the OnPageChangeListener: Callback_(computer_programming). They're "called back" from code other than where they are defined. You may not have heard the term, but anyone using event-driven APIs (like GUIs, whether Android or AWT/Swing) will be familiar with the concept.

[Kishor Joshi]

Ok
I Tried to use all 3 Methods in Callback

Originally I posted code using these method
But None of them working like what I want



Any Other Suggestion?

[Ulf Dittmer]

Um, I think you missed pretty much all the points I've been trying to make in all my replies. More directly: Why are you listening for events in the ViewPager if you're actually interested in events concerning the images (or whatever View they are part of, which you haven't said so far)? If you are interested in "click" or "touch" events, why are you listening for "page scroll" or "page select" events?

[Kishor Joshi]

Ok


So what to do know?

[Ulf Dittmer]

Attach appropriate listeners to whatever View holds the images (you haven't said what kind of View that is, so we can't help with that).

[Kishor Joshi]

Ok

here is my complete code of PagerAdapter Code

public class MyAdapter extends PagerAdapter {
    	
    	  
    	  
    	
    	
    	private int[] pics = { R.drawable.desert, R.drawable.hydra, R.drawable.jellyfish,
    			R.drawable.lighthouse, R.drawable.tulips};

    	int[] backgroundcolor = { 
    			   0xFF101010,
    			   0xFF202020,
    			   0xFF303030,
    			   0xFF404040,
    			   0xFF505050};
    	
    	
    	@Override
    	public int getCount() {
    		// TODO Auto-generated method stub
    		return NUM_VIEWS;
    	}

    	@Override
    	public boolean isViewFromObject(View view, Object object) {
    		// TODO Auto-generated method stub
    		
    		return view ==  object;
    	}

    	@Override
    	public void destroyItem(ViewGroup collection, int position, Object object) {
    		// TODO Auto-generated method stub
    		
    		collection.removeView((LinearLayout)object);
    		
    	}

    	
    	@Override
    	public Object instantiateItem(ViewGroup collection, int position) {
    		// TODO Auto-generated method stub
    		
    		LinearLayout layout = new LinearLayout(MainActivity.this);
    		try
    		{
    		
    		TextView textView = new TextView(MainActivity.this);
    	      textView.setTextColor(Color.WHITE);
    	      textView.setTextSize(30);
    	      textView.setTypeface(Typeface.DEFAULT_BOLD);
    	      textView.setText(String.valueOf(position));
    	      
    	      ImageView imageView = new ImageView(MainActivity.this);
    	      imageView.setImageResource(pics[position]);
    	      LayoutParams imageParams = new LayoutParams(
    	        LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
    	      imageView.setLayoutParams(imageParams);
    	      
    	      
    	      layout.setOrientation(LinearLayout.VERTICAL);
    	      LayoutParams layoutParams = new LayoutParams(
    	        LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
    	      //layout.setBackgroundColor(backgroundcolor[position]);
    	      layout.setLayoutParams(layoutParams);
    	      layout.addView(textView);
    	      layout.addView(imageView);
    	      
    	      final int page = position;
    	     

    	    
    	      collection.addView(layout);
    	      return layout;
    		}
    		catch(Exception e)
    		{
    			e.printStackTrace();
    		}
    		
  	      return layout;

    		
    		
    	}
    	}

Can you know figure out?

[Ulf Dittmer]

I'm sure you can figure it out on your own; that'll be much more useful as a learning experience for you. Look up the javadocs of the View holding the images to learn what listeners you can attach to it. Don't forget to check the superclass(es) of it as well. Which listeners are those? Which of those suggest themselves if you want to handle clicking on it?

A hint: listeners are generally attached via methods called "setOn..."

[Kishor Joshi]

Ok

So I am using LinearLayout to handle all my Views in it.
So How can I use refence of that layout in MainActivity.


I have posted all my code.

[Ulf Dittmer]

The kind of layout is irrelevant. As I said (3 times by now), the View that holds the images is important.

[Kishor Joshi]

Ok here is few Changes that I made in My Code and At least it let me Understand How these method Interact with Each Otehr

public boolean isViewFromObject(View view, Object object) {
    		// TODO Auto-generated method stub
    		System.out.println("Inside isViewFromObject()");
    		return view == ((ImageView) object);
    	}

    	
    	public void destroyItem(View collection, int position, Object view) {
    		// TODO Auto-generated method stub
    		Toast.makeText(getApplicationContext(),"Inside DestroyItem() ", Toast.LENGTH_SHORT).show();
    		((ViewPager) collection).removeView((ImageView) view);
    		Toast.makeText(getApplicationContext(),"Exiting DestroyItem()", Toast.LENGTH_SHORT).show();
    	}

    
    	
    	
    	public Object instantiateItem(ViewGroup collection, int position) {
    		// TODO Auto-generated method stub
    		
    		Toast.makeText(getApplicationContext(),"Inside InstatiateItem()", Toast.LENGTH_SHORT).show();
    	      
    		ImageView view = new ImageView(MainActivity.this);
			view.setImageResource(pics[position]);

			((ViewPager) collection).addView(view, 0);

			Toast.makeText(getApplicationContext(),"exiting InstatiateItem()", Toast.LENGTH_SHORT).show();
			return view;
    	  }
    	
    	
   }

By This I have seen that Each time when we switch to a New Screen Old View is Removed than Instatite Item is Called again and again.
My Question is How can I get currently focused View and Its id?

[Ulf Dittmer]

http://stackoverflow.com/questions/4486034/get-root-view-from-current-activity

[Kishor Joshi]

Thanks ulf again as usual
I solved my problem by your direction

I have fetched view position in instatitem() method.
And it works


Thanks