我已经实现了Carousel Viewpager ...但是我被困在一点。 ArrayList中有10个图像项...显示前3个项（0,1,2位置），我们可以水平滚动一个 我想要的是，当我单击第一个位置（即0）时，它应该转到位置1，而当我单击位置2时，它应该位于位置1。 我该如何实现？enter image description here
Method in mainActivity
private void showDrinkList() {
try {
DisplayMetrics metrics = new DisplayMetrics();
Objects.requireNonNull(getActivity()).getWindowManager().getDefaultDisplay().getMetrics(metrics);
int pageMargin = ((metrics.widthPixels / 3) * 2);
pager.setPageMargin(-pageMargin);
CarouselPagerAdapter adapter = new CarouselPagerAdapter(context,this.getChildFragmentManager(), this.getChildFragmentManager(), pager, drinkLists);
pager.setAdapter(adapter);
pager.addOnPageChangeListener(adapter);
if (drinkLists.size() > 1)
pager.setCurrentItem(1);
pager.setOffscreenPageLimit(3);
pager.setHorizontalScrollBarEnabled(true);
} catch (Exception e) {
e.printStackTrace();
} }
Carousel Adapter -
import android.content.Context;
import android.graphics.Interpolator;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.widget.Toast;
import java.lang.reflect.Field;
import java.util.List;
import ae.frink.android.R;
import ae.frink.android.app.customDialog.RedeemDialog;
import ae.frink.android.model.BeanDrinkImage;
import ae.frink.android.utils.FixedSpeedScroller;
import ae.frink.android.utils.ViewPagerCustomDuration;
public class CarouselPagerAdapter extends FragmentPagerAdapter implements ViewPager.OnPageChangeListener {
public final static float BIG_SCALE = 0.8f;
private final static float SMALL_SCALE = 0.4f;
private final static float DIFF_SCALE = BIG_SCALE - SMALL_SCALE;
private FragmentManager context;
private Context c;
private FragmentManager fragmentManager;
private float scale;
public static ViewPager viewPager;
private List<BeanDrinkImage.DrinkList> drinkLists;
private CarouselPagerAdapter adapter;
//private ItemFragment itemFragment;
public CarouselPagerAdapter(Context c, FragmentManager context, FragmentManager fm, ViewPager viewPager,
List<BeanDrinkImage.DrinkList> drinkLists) {
super(fm);
this.fragmentManager = fm;
this.context = context;
this.c = c;
// this.itemFragment = new ItemFragment(drinkLists);
this.viewPager = viewPager;
this.drinkLists = drinkLists;}
@Override
public Fragment getItem(int position) {
// make the first pager bigger than others
try {
if (position == 0) //BarInformationFrag.FIRST_PAGE)
scale = SMALL_SCALE;
else if(position == 1)
scale = BIG_SCALE;
else if(position == 2)
scale = SMALL_SCALE;
else
scale = SMALL_SCALE;
position = position % drinkLists.size();
} catch (Exception e) {
e.printStackTrace();
}
Log.e("drinkSize", "....----" + drinkLists.size());
// ItemFragment itemFragment = new ItemFragment();
return ItemFragment.newInstance(context, position, scale, drinkLists);
}
@Override
public int getCount() {
// int count = 0;
// try {
// count = BarInformationFrag.count * BarInformationFrag.LOOPS;
// } catch (Exception e) {
// // TODO: handle exception
// e.printStackTrace();
// }
// return count;
return drinkLists.size();
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
try {
if (positionOffset >= 0f && positionOffset <= 1f) {
CarouselLinearLayout cur = getRootView(position);
CarouselLinearLayout next = getRootView(position + 1);
cur.setScaleBoth(BIG_SCALE - DIFF_SCALE * positionOffset);
next.setScaleBoth(SMALL_SCALE + DIFF_SCALE * positionOffset);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
@SuppressWarnings("ConstantConditions")
private CarouselLinearLayout getRootView(int position) {
return (CarouselLinearLayout) fragmentManager.findFragmentByTag(this.getFragmentTag(position))
.getView().findViewById(R.id.root_container);
}
private String getFragmentTag(int position) {
return "android:switcher:" + viewPager.getId() + ":" + position;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
Carousel Linear Layout -
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.widget.LinearLayout;
public class CarouselLinearLayout extends LinearLayout {
private float scale = CarouselPagerAdapter.BIG_SCALE;
// private float scale = .5f;
public CarouselLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CarouselLinearLayout(Context context) {
super(context);
}
public void setScaleBoth(float scale) {
this.scale = scale;
this.invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// The main mechanism to display scale animation, you can customize it as your needs
int w = this.getWidth();
int h = this.getHeight();
canvas.scale(scale, scale, w / 2, h / 2);
}
}
item Fragment -
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import ae.frink.android.R;
import ae.frink.android.app.customDialog.RedeemDialog;
import ae.frink.android.connection.ApiClient;
import ae.frink.android.model.BeanDrinkImage;
import static ae.frink.android.Carousel.CarouselPagerAdapter.viewPager;
public class ItemFragment extends Fragment {
private static final String POSITON = "position";
private static final String SCALE = "scale";
private static final String DRAWABLE_RESOURE = "resource";
private static final String DRINK_LIST = "drinkList";
private List<BeanDrinkImage.DrinkList> dL;
private static final String IMAGE = "image";
public ArrayList<Integer> imageArray;
private Context context;
private List<BeanDrinkImage.DrinkList> drinkLists;
private SharedPreferences sharedPreferences;
private int screenWidth;
private int screenHeight;
/* private int[] imageArray = new int[]{R.drawable.cocktail_lime_gin_fizz_1, R.drawable.cocktail_lime_gin_fizz_1,
R.drawable.cocktail_lime_gin_fizz_1, R.drawable.cocktail_lime_gin_fizz_1, R.drawable.cocktail_lime_gin_fizz_1,
R.drawable.cocktail_lime_gin_fizz_1, R.drawable.cocktail_lime_gin_fizz_1, R.drawable.cocktail_lime_gin_fizz_1,
R.drawable.cocktail_lime_gin_fizz_1, R.drawable.cocktail_lime_gin_fizz_1};
*/
public ItemFragment() {
}
/*
@SuppressLint("ValidFragment")
public ItemFragment(List<BeanDrinkImage.DrinkList> drinkLists) {
this.drinkLists = drinkLists;
}
*/
public static Fragment newInstance(FragmentManager context, int pos, float scale, List<BeanDrinkImage.DrinkList> dL) {
ItemFragment fr = new ItemFragment();
Bundle b = new Bundle();
b.putInt(POSITON, pos);
b.putFloat(SCALE, scale);
b.putParcelableArrayList(DRINK_LIST, (ArrayList) dL);
//drinkLists=dL;
// this.context = context;
// this.dL = dL;
// b.putIntegerArrayList(IMAGE, imageArray);
Log.e("drinkSize", "....+++"+dL.size());
fr.setArguments(b);
return fr;//frFragment.instantiate(context, ItemFragment.class.getName(), b);
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWidthAndHeight();
sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
}
@SuppressLint("SetTextI18n")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (container == null) {
return null;
}
context = getActivity();
final int postion = this.getArguments().getInt(POSITON);
float scale = this.getArguments().getFloat(SCALE);
this.imageArray = this.getArguments().getIntegerArrayList(IMAGE);
drinkLists = (ArrayList) this.getArguments().getParcelableArrayList(DRINK_LIST);
// TODO 21 sep changes
// LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(screenWidth / 3,
// h/4);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(screenWidth / 2,
screenWidth/2);
LinearLayout linearLayout = (LinearLayout) inflater.inflate(R.layout.fragment_image, container, false);
TextView textView = (TextView) linearLayout.findViewById(R.id.text);
CarouselLinearLayout root = (CarouselLinearLayout) linearLayout.findViewById(R.id.root_container);
ImageView imageView = (ImageView) linearLayout.findViewById(R.id.pagerImg);
ImageView starImage = (ImageView) linearLayout.findViewById(R.id.imgStar);
imageView.setLayoutParams(layoutParams);
String imageUrl = "";
try {
Log.e("drinkSize", "...."+drinkLists.size());
if (drinkLists.size() > 0) {
imageUrl = ApiClient.IMAGE_URL + drinkLists.get(postion).getImage();
Picasso.get().load(imageUrl).into(imageView);
Log.e("drinkName", drinkLists.get(postion).getDrinkName());
textView.setText(drinkLists.get(postion).getDrinkName());
if (drinkLists.get(postion).getIs_recomended() == 1) {
starImage.setVisibility(View.VISIBLE);
} else {
starImage.setVisibility(View.INVISIBLE);
}
}
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (getActivity() != null) {
RedeemDialog redeemDialog = new RedeemDialog(getActivity(), drinkLists, postion);
redeemDialog.setCanceledOnTouchOutside(true);
redeemDialog.show();
// 12-march
/* if (sharedPreferences.getString(CommonVar.IS_SUBSCRIBED, "0").equals("0")) {
Toast.makeText(getContext(), "Please subscribe first", Toast.LENGTH_SHORT).show();
} else {
RedeemDialog redeemDialog = new RedeemDialog(getActivity(), list, postion);
redeemDialog.setCanceledOnTouchOutside(true);
redeemDialog.show();
}*/
}
}
});
root.setScaleBoth(scale);
} catch (Exception e) {
e.printStackTrace();
}
return linearLayout;
}
/**
* Get device screen width and height
*/
private void getWidthAndHeight() {
DisplayMetrics displaymetrics = new DisplayMetrics();
try {
Objects.requireNonNull(getActivity()).getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
screenHeight = displaymetrics.heightPixels;
screenWidth = displaymetrics.widthPixels;
} catch (Exception e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
holder.setIsRecyclable(false);
答案 1 :(得分：0)
if (position == 0) {
scale = SMALL_SCALE;}
else if(position == 1){
scale = BIG_SCALE;
}
else if(position == 2)
{
scale = SMALL_SCALE;
}
else{
scale = SMALL_SCALE;
}