未使用Fresco将java图像加载到gridView
我无法将图像从internet加载到gridView。我正在使用湿壁画进行图像加载。当我运行应用程序时,它不会崩溃,但不会在gridView中显示图像。此外,logcat中没有显示错误。我是Android开发新手。提前谢谢
厨房碎片。爪哇
package com.example.安卓.tabswithswipes;
import 安卓.app.ActionBar;
import 安卓.app.Activity;
import 安卓.content.Context;
import 安卓.net.Uri;
import 安卓.support.v4.app.Fragment;
import 安卓.os.Bundle;
import 安卓.support.annotation.Nullable;
import 安卓.support.v7.app.AppCompatActivity;
import 安卓.view.LayoutInflater;
import 安卓.view.View;
import 安卓.view.ViewGroup;
import 安卓.widget.GridView;
import 安卓.widget.ImageView;
import 安卓.widget.ProgressBar;
import 安卓.widget.Spinner;
import 安卓.widget.TextView;
import com.example.安卓.tabswithswipes.Utils.GridImageAdapter;
import com.example.安卓.tabswithswipes.Utils.UniversalImageLoader;
import com.facebook.drawee.view.SimpleDraweeView;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.util.ArrayList;
/**
* Created by Chaitanya Shiva on 08-05-2018.
*/
public class GalleryFragment extends Activity {
private GridView gridView;
private ImageView galleryImage;
private ProgressBar mProgressBar;
private Spinner directorySpinner;
private Context mContext = GalleryFragment.this;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_gallery);
galleryImage = (SimpleDraweeView)findViewById(R.id.galleryImageView);
gridView = (GridView)findViewById(R.id.gridView);
directorySpinner = (Spinner)findViewById(R.id.spinnerDirectory);
mProgressBar = (ProgressBar)findViewById(R.id.progressBar);
mProgressBar.setVisibility(View.GONE);
ImageView closeGallery = (ImageView)findViewById(R.id.closeGallery);
closeGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
TextView nextScreen = (TextView) findViewById(R.id.tvNext);
nextScreen.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
Uri uri = Uri.parse("https://www.gstatic.com/webp/gallery/4.sm.jpg");
galleryImage.setImageURI(uri);
tempGridSetup();
}
private void setUpImageGrid(ArrayList<String> imgURLs){
GridView gridView = (GridView)findViewById(R.id.gridView);
GridImageAdapter adapter = new GridImageAdapter(mContext, R.layout.layout_grid_imageview,"", imgURLs);
gridView.setAdapter(adapter);
}
private void tempGridSetup(){
ArrayList<String> imgURLs = new ArrayList<>();
imgURLs.add("https://www.gstatic.com/webp/gallery/4.sm.jpg");
imgURLs.add("https://www.gstatic.com/webp/gallery3/1.sm.png");
imgURLs.add("https://cdn.pixabay.com/photo/2018/05/10/09/07/bleeding-heart-3387085_1280.jpg");
imgURLs.add("https://images.idgesg.net/images/article/2017/08/安卓_robot_logo_by_ornecolorada_cc0_via_pixabay1904852_wide-100732483-large.jpg");
imgURLs.add("https://www.安卓central.com/sites/安卓central.com/files/styles/xlarge_wm_brw/public/article_images/2018/03/安卓-p-logo-pixel-2-xl-5.jpg?itok=DB93lUGS");
imgURLs.add("https://www.安卓central.com/sites/安卓central.com/files/styles/xlarge_wm_brw/public/article_images/2018/03/安卓-p-virtual-notch.jpg?itok=EnKJzDgF");
imgURLs.add("https://www.安卓central.com/sites/安卓central.com/files/styles/xlarge_wm_brw/public/article_images/2018/03/samsung-galaxy-s9-plus-black-4.jpg?itok=bTitZlS_");
imgURLs.add("https://www.extremetech.com/wp-content/uploads/2017/03/smiling-安卓.jpg");
imgURLs.add("https://rimblogs.files.wordpress.com/2016/04/marshmallowman.png?w=800");
imgURLs.add("https://www.安卓central.com/sites/安卓central.com/files/topic_images/2015/安卓-apps-topic.png");
imgURLs.add("https://images.idgesg.net/images/article/2017/11/安卓-security-100741557-large.jpg");
setUpImageGrid(imgURLs);
}
}
GridImageAdapter。爪哇
package com.example.安卓.tabswithswipes.Utils;
import 安卓.content.Context;
import 安卓.graphics.Bitmap;
import 安卓.support.annotation.NonNull;
import 安卓.support.annotation.Nullable;
import 安卓.view.LayoutInflater;
import 安卓.view.View;
import 安卓.view.ViewGroup;
import 安卓.widget.ArrayAdapter;
import 安卓.widget.ImageView;
import 安卓.widget.ProgressBar;
import com.example.安卓.tabswithswipes.R;
import com.facebook.drawee.view.SimpleDraweeView;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;
import java.util.ArrayList;
/**
* Created by Chaitanya Shiva on 12-05-2018.
*/
public class GridImageAdapter extends ArrayAdapter<String>{
private Context mContext;
private LayoutInflater mInflater;
private int layoutResource;
private String mAppend;
private ArrayList<String> imgURLs;
public GridImageAdapter(Context context, int layoutResource, String append, ArrayList<String> imgURLs) {
super(context, layoutResource, imgURLs);
this.mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.mContext = context;
this.layoutResource = layoutResource;
this.mAppend = append;
this.imgURLs = imgURLs;
}
private static class ViewHolder{
SimpleDraweeView image;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
/*
Viewholder build pattern (Similar to recyclerview)
*/
final ViewHolder holder;
if(convertView == null){
convertView = mInflater.inflate(layoutResource, parent, false);
holder = new ViewHolder();
holder.image = (SimpleDraweeView) convertView.findViewById(R.id.gridImageView);
convertView.setTag(holder);
}
else{
holder = (ViewHolder) convertView.getTag();
}
String imgURL = getItem(position);
holder.image.setImageURI(imgURL);
return convertView;
}
}
布局\网格\图像视图。xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:安卓="http://schemas.安卓.com/apk/res/安卓" 安卓:layout_width="match_parent"
安卓:layout_height="match_parent">
<com.facebook.drawee.view.SimpleDraweeView
安卓:layout_width="match_parent"
安卓:layout_height="match_parent"
安卓:id="@+id/gridImageView"
安卓:scaleType="centerCrop"/>
</RelativeLayout>
# 1 楼答案
这里你忘了隐藏进度条。加载图像时,需要将其隐藏。您可以执行以下操作: