Question

加载网格视图时滚动不平滑。滚动需要一些时间。那么我如何优化gridview，以便我可以在该网格视图上放置更多图像。请告诉我一些优化网格视图的方法。

主Xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<GridView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="auto_fit"
 android:columnWidth="180dp"
android:stretchMode="columnWidth"
android:id="@+id/imggrid">
</GridView>
</RelativeLayout>

主要活动

package com.blogspot.techyy360.ukook_splash;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.image_grid);
GridView gridView=(GridView) findViewById(R.id.imggrid);
gridView.setAdapter(new CustomAdapter(this));
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(getApplicationContext(),"You clicked on Recipie "+position, Toast.LENGTH_LONG).show();

    }
});
    }
  }

用于图像网格视图的CustomAdapter

package com.blogspot.techyy360.ukook_splash;


    import android.content.Context;
   import android.view.View;
   import android.view.ViewGroup;
   import android.widget.BaseAdapter;
   import android.widget.GridView;
     import android.widget.ImageView;
  import android.widget.ProgressBar;
   import android.widget.RelativeLayout;

 public class CustomAdapter extends BaseAdapter{
  private Context mcontext;
@Override
 public int getCount() {
return img.length;
   }

@Override
public Object getItem(int position) {
return img[position];
}

 @Override
   public long getItemId(int position) {
    return 0;
 }
 public CustomAdapter(Context c){
  mcontext=c;
   }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
       ImageView imgview;
     if(convertView==null){
    imgview=new ImageView(mcontext);
    imgview.setLayoutParams(new RelativeLayout.LayoutParams(525, 400));
    imgview.setScaleType(ImageView.ScaleType.CENTER_CROP);
    imgview.setPadding(8, 8, 8, 8);

}else{
    imgview=(ImageView) convertView;
}
imgview.setImageResource(img[position]);
return imgview;
      }
     public Integer[] img={
    R.drawable.image1, R.drawable.image2,
    R.drawable.image3, R.drawable.image3,
    R.drawable.image1, R.drawable.image2,
    R.drawable.image2, R.drawable.image3,
    R.drawable.image3, R.drawable.image1,
    R.drawable.image2, R.drawable.image1,
    R.drawable.image2, R.drawable.image1,
    R.drawable.image3, R.drawable.image1
   };
  }

Answer 1

这是我的完整CustomAdapter代码，使用滑动库。它是快速和流畅的，但是，根据您的需要，考虑更改加载图像时使用的diskCacheStartegy。

import android.content.Context;
import android.graphics.Point;
import android.util.Log;
import android.view.Display;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.WindowManager;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;

public class CustomAdapter3 extends BaseAdapter {
    Context context;
    public static int[] imageId;
    private static LayoutInflater inflater = null;

    public CustomAdapter3(Context con, int[] prgmImages) {
        context = con;
        imageId = prgmImages;
        inflater = (LayoutInflater) context.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        return imageId.length;
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

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

    public class Holder {
        ImageView img;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        final Holder holder;
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.program_list3, parent, false);
            holder = new Holder();
            holder.img = (ImageView) convertView.findViewById(R.id.imageView1);
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();
        }
        Glide
                .with(context)
                .load(imageId[position])
                .dontAnimate()
                .diskCacheStrategy(DiskCacheStrategy.NONE)
                .placeholder(R.drawable.loading_spinner)
                .into(holder.img);
        return convertView;
    }
}

如何在Android中优化Image GridView？

1 个答案: