從Firebase存儲api檢索圖像

Question

我製作了一個應用程序，它從Firebase存儲中檢索圖像。圖像被檢索並顯示在圖像視圖中，但它需要2分鐘以上才能檢索圖像。我已經按照以下鏈接檢索來自使用滑行庫的Firebase存儲的圖像。

https://github.com/firebase/FirebaseUI-Android/tree/master/storage

這裏是我的代碼

MainActivity.java

package com.example.vikas.where_i_am; 

import android.media.Image; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.widget.ImageView; 
import android.widget.TextView; 

import com.bumptech.glide.Glide; 
import com.google.firebase.storage.FirebaseStorage; 
import com.google.firebase.storage.StorageReference; 

public class MainActivity extends AppCompatActivity 
{ 

    private ImageView imageView; 
    private TextView mtext; 
    private StorageReference mstorage,filepath; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     imageView=(ImageView)findViewById(R.id.action_image); 
     mtext=(TextView)findViewById(R.id.text); 

     mstorage= FirebaseStorage.getInstance().getReference().child("Screenshot (129).png"); 
     Glide.with(MainActivity.this) 
       .using(new FirebaseImageLoader()) 
       .load(mstorage) 
       .fitCenter() 
       .centerCrop() 
       .into(imageView); 
    } 
} 

FirebaseImageLoader.java

package com.example.vikas.where_i_am; 

/** 
* Created by vikas on 5/4/17. 
*/ 


     import android.util.Log; 

     import com.bumptech.glide.Priority; 
     import com.bumptech.glide.load.data.DataFetcher; 
     import com.bumptech.glide.load.model.stream.StreamModelLoader; 
     import com.google.android.gms.tasks.Tasks; 
     import com.google.firebase.storage.StorageReference; 
     import com.google.firebase.storage.StreamDownloadTask; 

     import java.io.IOException; 
     import java.io.InputStream; 

/** 
* ModelLoader implementation to download images from FirebaseStorage with Glide. 
* 
* Sample Usage: 
* <pre> 
*  StorageReference ref = FirebaseStorage.getInstance().getReference().child("myimage"); 
*  ImageView iv = (ImageView) findViewById(R.id.my_image_view); 
* 
*  Glide.with(this) 
*   .using(new FirebaseImageLoader()) 
*   .load(ref) 
*   .into(iv); 
* </pre> 
*/ 
public class FirebaseImageLoader implements StreamModelLoader<StorageReference> 
{ 

    private static final String TAG = "FirebaseImageLoader"; 

    @Override 
    public DataFetcher<InputStream> getResourceFetcher(StorageReference model, int width, int height) { 
     return new FirebaseStorageFetcher(model); 
    } 

    private class FirebaseStorageFetcher implements DataFetcher<InputStream> { 

     private StorageReference mRef; 
     private StreamDownloadTask mStreamTask; 
     private InputStream mInputStream; 

     FirebaseStorageFetcher(StorageReference ref) { 
      mRef = ref; 
     } 

     @Override 
     public InputStream loadData(Priority priority) throws Exception { 
      mStreamTask = mRef.getStream(); 
      mInputStream = Tasks.await(mStreamTask).getStream(); 

      return mInputStream; 
     } 

     @Override 
     public void cleanup() { 
      // Close stream if possible 
      if (mInputStream != null) { 
       try { 
        mInputStream.close(); 
        mInputStream = null; 
       } catch (IOException e) { 
        Log.w(TAG, "Could not close stream", e); 
       } 
      } 
     } 

     @Override 
     public String getId() { 
      return mRef.getPath(); 
     } 

     @Override 
     public void cancel() { 
      // Cancel task if possible 
      if (mStreamTask != null && mStreamTask.isInProgress()) { 
       mStreamTask.cancel(); 
      } 
     } 
    } 
} 

XML文件

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.vikas.where_i_am.MainActivity" 
    android:orientation="vertical"> 

    <TextView 
     android:id="@+id/text" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Hello World!" 
     android:layout_weight="0"/> 
    <ScrollView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"> 
    <ImageView 
     android:id="@+id/action_image" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_weight="1"/> 
    </ScrollView> 
</LinearLayout> 

任何人都可以幫助我，使圖像檢索更快。

Answer 1

使用UniversalLoader可以更快地加載圖像，而不是滑動它可以加速圖像加載速度，而不是滑動。

DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder() 
      .cacheOnDisc(true).cacheInMemory(true) 
      .imageScaleType(ImageScaleType.EXACTLY) 
      .displayer(new FadeInBitmapDisplayer(300)).build(); 

    ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
      getApplicationContext()) 
      .defaultDisplayImageOptions(defaultOptions) 
      .memoryCache(new WeakMemoryCache()) 
      .discCacheSize(100 * 1024 * 1024).build(); 

    ImageLoader.getInstance().init(config); 

    final ImageLoader imageLoader = ImageLoader.getInstance(); 

    final DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true) 
      .cacheOnDisc(true).resetViewBeforeLoading(true) 
      .showImageForEmptyUri(R.mipmap.preview) 
      .showImageOnFail(R.mipmap.preview) 
      .build(); 


mdatabase.child(Table_item).addValueEventListener(new ValueEventListener() { 


     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      Map map = (Map) dataSnapshot.getValue(); 
      String image1 = (String) map.get("imagename"); 
      String image2 = (String) map.get("image2name"); 
      imageLoader.displayImage(ImageView1, image1, options, new ImageLoadingListener() { 

       @Override 
       public void onLoadingStarted(String imageUri, View view) { 

       } 

       @Override 
       public void onLoadingFailed(String imageUri, View view, FailReason failReason) { 
        progressBar.setVisibility(View.GONE); 
       } 

       @Override 
       public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) { 


       } 

       @Override 
       public void onLoadingCancelled(String imageUri, View view) { 
        progressBar.setVisibility(View.GONE); 
       } 
      }); 
      imageLoader.displayImage(ImageView2, image2name, options, new ImageLoadingListener() { 
       @Override 
       public void onLoadingStarted(String imageUri, View view) { 

       } 

       @Override 
       public void onLoadingFailed(String imageUri, View view, FailReason failReason) { 
        progressBar.setVisibility(View.GONE); 
       } 

       @Override 
       public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) { 
        i++; 
        progressstatus(i); 
       } 

       @Override 
       public void onLoadingCancelled(String imageUri, View view) { 
        progressBar.setVisibility(View.GONE); 

       } 
      });