查找Glide的上下文Android

问题描述：

我试图在GridView中显示图片。此网格视图由适配器填充。我总是遇到这样的问题，即应用程序膨胀新卡时非常滞后。在互联网搜索后，我发现了Glide，这可能有助于提高性能。查找Glide的上下文Android

现在我坚持，因为我无法想象我应该Glide.with通过在什么情况下（...）：

Glide.with(**CONTEXT**).load(sights.get(i).mImageRessourceID).into(sightViewHolder.sightPhoto);

要构建我用卡：MainActivity - >片段 - >适配器。

这是从适配器代码：

public class SightCardAdapter extends RecyclerView.Adapter<SightCardAdapter.SightViewHolder> { 


public static class SightViewHolder extends RecyclerView.ViewHolder { 
    CardView cv; 
    TextView sightName; 
    ImageView sightPhoto; 

    SightViewHolder(View itemView) { 
     super(itemView); 
     cv = (CardView) itemView.findViewById(R.id.cv); 
     sightName = (TextView) itemView.findViewById(R.id.sight_name); 
     sightPhoto = (ImageView) itemView.findViewById(R.id.sight_photo); 
    } 
} 

List<Sight> sights; 

SightCardAdapter(List<Sight> sights) { 
    this.sights = sights; 
} 


@Override 
public void onAttachedToRecyclerView(RecyclerView recyclerView) { 

    super.onAttachedToRecyclerView(recyclerView); 
} 

@Override 
public SightViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { 
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false); 
    SightViewHolder pvh = new SightViewHolder(v); 
    return pvh; 
} 

@Override 
public void onBindViewHolder(SightViewHolder sightViewHolder, int i) { 
    sightViewHolder.sightName.setText(sights.get(i).mName); 
    //sightViewHolder.sightPhoto.setImageResource(sights.get(i).mImageRessourceID); 
    Glide.with().load(sights.get(i).mImageRessourceID).into(sightViewHolder.sightPhoto); // missing context 
} 

@Override 
public int getItemCount() { 
    return sights.size(); 
}

}

可有人请给我一些暗示？我不能像我应该通过在

PS：此外，如果任何人有一定的窍门如何使我的代码更有效，我将不胜感激:)

通行证上下文适配器 - 以同样的方式，你SightViewHolder（查看ItemView控件，上下文语境） – MinnuKaAnae

将它传递给'LayoutInflater.from' ...提示：你使用了哪个类的哪个方法？ – Selvin

传递上下文作为参数参考Sataym的答案http://stackoverflow.com/a/43518232/3578677 –

答

在将数据传递到适配器也传递参数上下文。如果您从MainActivity的子项Fragment调用Adapter，只需将getApplicationContext（）作为上下文传递给Adapter。

SightCardAdapter(Context context,List<Sight> sights) { 
    this.sights = sights; 
    this.context=context; 
} 

while calling from Fragment. 
SightCardAdapter(getApplicationContext(),sights);

我已经试过这个解决方案。看起来像：滑翔。与（getApplicationContext（））的负载（sights.get（ⅰ）.mImageRessourceID）.into（sightViewHolder.sightPhoto）。但Android Studio认为无法解析方法：S –

Glide.with（getApplicationContext（））您无法在适配器中使用getApplicationContext（）。从片段发送此上下文到您的适配器。 –

答

您可以从任何View获得Context对象。当您为适配器创建对象

Glide.with(sightViewHolder.sightPhoto.getContext()).load(sights.get(i).mImageRessourceID).into(sightViewHolder.sightPhoto);

答

传递上下文，下面

public class SightCardAdapter extends RecyclerView.Adapter<SightCardAdapter.SightViewHolder> { 


public static class SightViewHolder extends RecyclerView.ViewHolder { 
    CardView cv; 
    TextView sightName; 
    ImageView sightPhoto; 


    SightViewHolder(View itemView) { 
     super(itemView); 
     cv = (CardView) itemView.findViewById(R.id.cv); 
     sightName = (TextView) itemView.findViewById(R.id.sight_name); 
     sightPhoto = (ImageView) itemView.findViewById(R.id.sight_photo); 

    } 
} 
Context context; 
List<Sight> sights; 

SightCardAdapter(List<Sight> sights,Context context) { 
    this.sights = sights; 
    this.context = context; 
} 


@Override 
public void onAttachedToRecyclerView(RecyclerView recyclerView) { 

    super.onAttachedToRecyclerView(recyclerView); 
} 

@Override 
public SightViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { 
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false); 
    SightViewHolder pvh = new SightViewHolder(v); 
    return pvh; 
} 

@Override 
public void onBindViewHolder(SightViewHolder sightViewHolder, int i) { 
    sightViewHolder.sightName.setText(sights.get(i).mName); 
    //sightViewHolder.sightPhoto.setImageResource(sights.get(i).mImageRessourceID); 
    Glide.with(context).load(sights.get(i).mImageRessourceID).into(sightViewHolder.sightPhoto); // missing context 
} 

@Override 
public int getItemCount() { 
    return sights.size(); 
} 

}

答

Context context;//declare this globle 

SightCardAdapter(Context context, List<Sight> sights) { 
    this.context=context;// add context in constructor of adapter class 
    this.sights = sights; 
}

现在改代码，在Glide如下使用context：

Glide.with(context).load(sights.get(i).mImageRessourceID).into(sightViewHolder.sightPhoto);

答

您通过上下文这样的适配器

Private Context mContext; 
SightCardAdapter(List<Sight> sights,Context mContext) { 
    this.sights = sights; 
    this.mContext = mContext; 
} 

Glide.with(mContext).load("url").into(imageView);

答

尝试

无论是在创建适配器对象从活动传递上下文或ItemView控件得到它。

Context context = itemView.getContext(); 
Pass this context to Glide.

答

有效使用..

private RequestManager glideManager; 

public MyAdater(Context context, Object activityOrFragment){ 
    if (object instanceof Fragment) { 
     glideManager = Glide.with((Fragment) object); 
    } else if (object instanceof Activity) { 
     glideManager = Glide.with((Activity) object); 
    } 
} 


@Override 
public void onBindViewHolder(ViewHolderGeneric viewHolder, int position) { 
    glideManager 
     .load(item.getResizedImageUrl()) 
     .placeholder(R.drawable.emptystates_card_bg_none) 
     .fitCenter() 
     .into(ivGoods); 
}

适配器

MyRecyclerAdapter adapter = new MyRecyclerAdapter(mContext, this); //this -> Activity or Fragment

查找Glide的上下文Android

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