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An iteration of a ViewPager2 adapter that displays data in a grid
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<?xml version="1.0" encoding="utf-8"?> | |
<GridView xmlns:android="http://schemas.android.com/apk/res/android" | |
android:id="@+id/grid_pager_view" | |
android:horizontalSpacing="4dp" | |
android:verticalSpacing="4dp" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" /> |
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import android.view.View | |
import android.widget.GridView | |
import androidx.recyclerview.widget.RecyclerView | |
import xyz.binary.foxlauncher.R | |
class GridPageHolder2(itemView: View) : RecyclerView.ViewHolder(itemView) { | |
val gridView: GridView = itemView.findViewById(R.id.grid_pager_view) | |
} |
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import android.content.Context | |
import android.view.LayoutInflater | |
import android.view.View | |
import android.view.ViewGroup | |
import android.widget.ArrayAdapter | |
import android.widget.GridView | |
import androidx.recyclerview.widget.RecyclerView | |
import xyz.binary.foxlauncher.R | |
import java.util.* | |
import kotlin.collections.ArrayList | |
import kotlin.math.ceil | |
abstract class GridPagerAdapter2<T>( | |
val context: Context, | |
val columns: Int, | |
val rows: Int | |
) : RecyclerView.Adapter<GridPageHolder>() { | |
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): GridPageHolder { | |
val view = LayoutInflater.from(parent.context).inflate(R.layout.grid_pager_page_layout2, parent, false) | |
return GridPageHolder(view).apply { | |
gridView.numColumns = columns | |
} | |
} | |
override fun getItemCount(): Int { | |
val itemsPerPage = columns * rows | |
var pages = round((getSize() / itemsPerPage).toDouble()).toInt() | |
val availableSlots = pages * itemsPerPage | |
if (getSize() - availableSlots > 0) { | |
pages += 1 | |
} | |
return pages | |
} | |
override fun onBindViewHolder(holder: GridPageHolder, position: Int) { | |
val grid = holder.gridView | |
val maxItems = columns * rows | |
val offset = maxItems * position | |
val items = ArrayList<T>() | |
for (i in 0 until maxItems) { | |
try { | |
items.add(getItem(i + offset)) | |
} catch (e: IndexOutOfBoundsException) { | |
break | |
} | |
} | |
grid.adapter = GridAdapter(context, items) | |
} | |
abstract fun getViewItem(item: T, convertView: View?, parent: ViewGroup): View | |
abstract fun getItem(position: Int): T | |
abstract fun getSize(): Int | |
inner class GridAdapter<R>( | |
context: Context, | |
val items: List<R>, | |
) : ArrayAdapter<R>(context, 0, items) { | |
constructor(context: Context) : this(context, Collections.emptyList()) | |
@Suppress("UNCHECKED_CAST") | |
override fun getView(position: Int, convertView: View?, parent: ViewGroup): View { | |
val item: R = this.items[position] | |
val view = this@GridPagerAdapter.getViewItem(item as T, convertView, parent) | |
// TODO Listeners | |
return view | |
} | |
} | |
} |
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