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StepPagerAdapter.java
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StepPagerAdapter.java
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package br.com.ericksprengel.android.baking.ui.recipe;
import android.support.annotation.NonNull;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.util.SparseArray;
import android.view.ViewGroup;
import java.util.List;
import br.com.ericksprengel.android.baking.data.Step;
public class StepPagerAdapter extends FragmentStatePagerAdapter {
private SparseArray<StepFragment> mFragmentsHolded = new SparseArray<>();
private List<Step> mSteps;
StepPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
void setSteps(List<Step> steps) {
mSteps = steps;
notifyDataSetChanged();
}
@NonNull
@Override
public Object instantiateItem(ViewGroup container, int position) {
Object fragment = super.instantiateItem(container, position);
if(fragment instanceof StepFragment) {
mFragmentsHolded.append(position, (StepFragment) fragment);
}
return fragment;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
mFragmentsHolded.delete(position);
super.destroyItem(container, position, object);
}
public StepFragment getCachedItem(int position) {
return mFragmentsHolded.get(position, null);
}
@Override
public StepFragment getItem(int position) {
Step step = mSteps.get(position);
return StepFragment.newInstance(step.getRecipeId(), step.getId());
}
@Override
public int getCount() {
return mSteps == null ? 0 : mSteps.size();
}
@Override
public CharSequence getPageTitle(int position) {
return mSteps.get(position).getShortDescription();
}
}