從api下載圖像

Question

請幫我在api應用程序中動態地從api下載圖像？

ImageLoader.java

package com.solodroid.ecommerce; 

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.util.Collections; 
import java.util.Map; 
import java.util.WeakHashMap; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 

import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Color; 
import android.os.Handler; 
import android.widget.ImageView; 

public class ImageLoader { 

    MemoryCache memoryCache=new MemoryCache(); 
    FileCache fileCache; 
    private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>()); 
    ExecutorService executorService; 
    Handler handler=new Handler();//handler to display images in UI thread 

    public ImageLoader(Context context){ 
     fileCache=new FileCache(context); 
     executorService=Executors.newFixedThreadPool(5); 
    } 


    public void DisplayImage(String url, ImageView imageView) 
    { 
     imageViews.put(imageView, url); 
     Bitmap bitmap=memoryCache.get(url); 
     if(bitmap!=null) 
      imageView.setImageBitmap(bitmap); 
     else 
     { 
      queuePhoto(url, imageView); 
      imageView.setBackgroundColor(Color.parseColor("#1e1411")); 
     } 
    } 

    private void queuePhoto(String url, ImageView imageView) 
    { 
     PhotoToLoad p=new PhotoToLoad(url, imageView); 
     executorService.submit(new PhotosLoader(p)); 
    } 

    private Bitmap getBitmap(String url) 
    { 
     File f=fileCache.getFile(url); 

     //from SD cache 
     Bitmap b = decodeFile(f); 
     if(b!=null) 
      return b; 

     //from web 
     try { 
      Bitmap bitmap=null; 
      URL imageUrl = new URL(url); 
      HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection(); 
      conn.setConnectTimeout(30000); 
      conn.setReadTimeout(30000); 
      conn.setInstanceFollowRedirects(true); 
      InputStream is=conn.getInputStream(); 
      OutputStream os = new FileOutputStream(f); 
      Constant.CopyStream(is, os); 
      os.close(); 
      conn.disconnect(); 
      bitmap = decodeFile(f); 
      return bitmap; 
     } catch (Throwable ex){ 
      ex.printStackTrace(); 
      if(ex instanceof OutOfMemoryError) 
       memoryCache.clear(); 
      return null; 
     } 
    } 

    //decodes image and scales it to reduce memory consumption 
    private Bitmap decodeFile(File f){ 
     try { 
      //decode image size 
      BitmapFactory.Options o = new BitmapFactory.Options(); 
      o.inJustDecodeBounds = true; 
      FileInputStream stream1=new FileInputStream(f); 
      BitmapFactory.decodeStream(stream1,null,o); 
      stream1.close(); 

      //Find the correct scale value. It should be the power of 2. 
      final int REQUIRED_SIZE=70; 
      int width_tmp=o.outWidth, height_tmp=o.outHeight; 
      int scale=1; 
      while(true){ 
       if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE) 
        break; 
       width_tmp/=2; 
       height_tmp/=2; 
       scale*=2; 
      } 

      //decode with inSampleSize 
      BitmapFactory.Options o2 = new BitmapFactory.Options(); 
      o2.inSampleSize=scale; 
      FileInputStream stream2=new FileInputStream(f); 
      Bitmap bitmap=BitmapFactory.decodeStream(stream2, null, o2); 
      stream2.close(); 
      return bitmap; 
     } catch (FileNotFoundException e) { 
     } 
     catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

    //Task for the queue 
    private class PhotoToLoad 
    { 
     public String url; 
     public ImageView imageView; 
     public PhotoToLoad(String u, ImageView i){ 
      url=u; 
      imageView=i; 
     } 
    } 

    class PhotosLoader implements Runnable { 
     PhotoToLoad photoToLoad; 
     PhotosLoader(PhotoToLoad photoToLoad){ 
      this.photoToLoad=photoToLoad; 
     } 

     @Override 
     public void run() { 
      try{ 
       if(imageViewReused(photoToLoad)) 
        return; 
       Bitmap bmp=getBitmap(photoToLoad.url); 
       memoryCache.put(photoToLoad.url, bmp); 
       if(imageViewReused(photoToLoad)) 
        return; 
       BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad); 
       handler.post(bd); 
      }catch(Throwable th){ 
       th.printStackTrace(); 
      } 
     } 
    } 

    boolean imageViewReused(PhotoToLoad photoToLoad){ 
     String tag=imageViews.get(photoToLoad.imageView); 
     if(tag==null || !tag.equals(photoToLoad.url)) 
      return true; 
     return false; 
    } 

    //Used to display bitmap in the UI thread 
    class BitmapDisplayer implements Runnable 
    { 
     Bitmap bitmap; 
     PhotoToLoad photoToLoad; 
     public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;} 
     public void run() 
     { 
      if(imageViewReused(photoToLoad)) 
       return; 
      if(bitmap!=null) 
       photoToLoad.imageView.setImageBitmap(bitmap); 
      else 
       photoToLoad.imageView.setBackgroundColor(Color.parseColor("#ffffff")); 
     } 
    } 

    public void clearCache() { 
     memoryCache.clear(); 
     fileCache.clear(); 
    } 

} 

請告訴我的錯誤或告訴我如何從Android應用程序的API下載圖像？如果你能找出one.I這將是很好必須使用PHP從api動態下載圖像。請幫我解決這個問題。

Answer 1

在你bulid.gradle（Module.app）添加此

dependencies { 
compile 'com.github.bumptech.glide:glide:3.6.1' 
} 

，並在活動中加入這一行

Glide.with(this).load(imageUrl).into(imageView);