I'm getting images by statically given the name like
{R.drawable.image1,R.drawable.image2,R.drawable.image3}
If I have some 50 images I cant give each and every file name in array so it needs to be dynamic how can I achieve this. And also please tell me where to put my dynamically code
package com.example.nauman.swipeapp;
import android.annotation.SuppressLint;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
public class SwipeAdapter extends PagerAdapter {
private int[]image = {R.drawable.image1,R.drawable.image2,R.drawable.image3};
private Context cx;
SwipeAdapter(Context cx){
this.cx=cx;
}
@Override
public int getCount() {
return image.length;
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
return (view==(RelativeLayout)object);
}
@SuppressLint("SetTextI18n")
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
LayoutInflater layoutInflater = (LayoutInflater) cx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
assert layoutInflater != null;
View view= layoutInflater.inflate(R.layout.page_fragment,container,false);
ImageView imageView= view.findViewById(R.id.imageView);
imageView.setImageResource(image[position]);
container.addView(view);
return view;
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
container.removeView((RelativeLayout) object);
}
}
This solution feels a little bit hacky not only because it uses reflection but also because it relies heavily on being able to recognize your own drawable resources by matching their names against a certain pattern (so you should try to use really unique names for the pictures)
That being said, you can change your code as follows:
Keep the private int[] image;
but initialize it in the Adapter's constructor:
SwipeAdapter(Context cx){
this.cx=cx;
buildImageArray();
}
with a new method (note: you have to import java.lang.reflect.Field;)
private void buildImageArray() {
// this will give you **all** drawables, including those from e.g. the support libraries!
Field[] drawables = R.drawable.class.getDeclaredFields();
SparseIntArray temp = new SparseIntArray();
int index = 0;
for (Field f : drawables) {
try {
System.out.println("R.drawable." + f.getName());
// check the drawable is "yours" by comparing the name to your name pattern
// this is the point where some unwanted drawable may slip in,
// so you should spend some effort on the naming/ matching of your pictures
if (f.getName().startsWith("image")) {
System.out.println("R.drawable." + f.getName() + "==========================================");
int id = cx.getResources().getIdentifier(f.getName(), "drawable", cx.getPackageName());
temp.append(index, id);
index++;
}
}
catch (Exception e) {
e.printStackTrace();
}
}
image = new int[index];
for (int i = 0; i < index; i++) {
image[i] = temp.valueAt(i);
}
}
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