加速android Gridview加载

Question

我有一个带有GridView女巫适配器的Alertdialog，它加载了很多元素。 问题是该对话框需要ca。 2-5秒显示。 如何加速呢？ 我在适配器的视图方法中考虑了多线程[…] 但是怎么办呢？我无法将方法主体放入可运行的线程中，因为那时我无法返回该项目（或？）。 我也在网上搜索了有关该内容的信息，但找不到一个对我有用的示例。

希望你能帮助我！

package com.ludevstudio.colorpicker;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.support.v4.content.ContextCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;

import java.util.ArrayList;


public class ColorpickerDialog extends AlertDialog {
     GridView grid;
    Colorpicker picker;
PaletteStyle style;
    private OnColorChoosedListener listener;

 public ColorpickerDialog(Context context, Colorpicker picker) {
    super(context);
    this.picker = picker;
    style = PaletteStyle.DEFAULT;
    initUI();
}
public ColorpickerDialog(Context context, Colorpicker picker, PaletteStyle style) {
    super(context);
    this.picker = picker;
   this.style = style;
    initUI();
}

private void initUI() {
    LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View layout = inflater.inflate(R.layout.dialog_colorpicker, null);

    grid = (GridView) ((View) layout).findViewById(R.id.dialog_grid);


    grid.setAdapter(new GridAdapter(getContext(), picker));


    setButton(AlertDialog.BUTTON_NEGATIVE, getContext().getResources().getString(R.string.dialog_cancel), new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            listener.onCanceled();
        }
    });
    setButton(AlertDialog.BUTTON_POSITIVE, getContext().getResources().getString(R.string.dialog_apply), new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            listener.onContiniued(picker.getSelectedColor());
        }
    });

    setButton(AlertDialog.BUTTON_NEUTRAL, "COSTUM", new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
         int red = Color.red(picker.getSelectedColor());
         int green = Color.green(picker.getSelectedColor());
         int blue = Color.blue(picker.getSelectedColor());

          CostumColorDialog cscd =new CostumColorDialog(getContext(), red, green, blue);
          cscd.show();
        }
    });

    setView(layout);
}



private class GridAdapter extends BaseAdapter {
    Context c;
    Colorpicker picker;

    public GridAdapter(Context c, Colorpicker picker) {
        this.c = c;
        this.picker = picker;
    }


    @Override
    public int getCount() {
        return picker.getColors().size();
    }

    @Override
    public Object getItem(int position) {
        return picker.getColors().get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final PaletteItem item = new PaletteItem(c);

                    switch (style) {
                        case ROUND:
                            item.setBackgroundResource(R.drawable.palette_item_round);
                            break;
                        case DEFAULT:
                            item.setBackgroundResource(R.drawable.palette_item_rect);
                            break;
                        case ROUNDRECT:
                            item.setBackgroundResource(R.drawable.palette_item_roundrect);
                            break;
                    }
                    item.getBackground().setColorFilter(picker.getColors().get(position), PorterDuff.Mode.SRC_OVER);

                    item.setTextColor(Color.WHITE);
                    if (picker.getColors().indexOf(picker.getSelectedColor()) == position) {
                        item.setChecked(true);

                    }


                    item.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            int index = picker.getColors().indexOf(picker.getSelectedColor());
                            PaletteItem i = (PaletteItem) grid.getChildAt(picker.getColors().indexOf(picker.getSelectedColor()));
                            i.setChecked(false);
                            picker.setSelectedColor(picker.colors.get(position));

                            item.setChecked(true);
                            listener.onColorChoosed(picker.getColors().get(position));
                        }
                    });



        return item;
    }
}

public void setListener(OnColorChoosedListener listener) {
     this.listener = listener;
}

public enum PaletteStyle {
     DEFAULT,
    ROUND,
    ROUNDRECT;
}

}