Question

我是android的初学者，在我需要将此图像发送到gridview中的另一个actitivty之后，我将图像的url保存在singleton中。请有人可以帮助我。

Answer 1

首先，您需要知道如何在活动之间发送数据。请参阅：Intent Android
接下来，在获取目标活动的网址后，您需要显示它。请参阅：Display image from URL

您的示例：Example

Answer 2

首先通过当前Activity的{{1}}将您的图片网址发送给另一个Intent。喜欢 -

activity

从NextActivity接收您的图片网址。喜欢 -

Intent intent = new Intent(currentActivity, nextActivity);
input.putExtra("urlKey", "urlValue");
startActivity(intent);

使用第三方库从web服务器/ url加载图像进行查看。看看Picasso。在Intent intent = getIntent(); String imageUrl = intent.getStringExtra("urlKey"); Picasso上使用Adapter。前 -

GridView

Answer 3

如果您使用像毕加索这样的第三方库，那么您可以通过几行代码实现目标执行以下步骤：

在build.gradle文件的依赖关系块中添加以下行

dependencies {compile'com.squareup.picasso：picasso：2.5.2'}

然后将图片加载到图片视图中：

语法：

Picasso.with(this)
   .load("YOUR IMAGE URL HERE")
   .into(imageView);

例如

Picasso.with(this)
                .load("https://www.samplecode.co/wp-content/uploads/2015/10/advertise.png")
                .into(imageView);

对于gridview，您创建一个适配器并使用该位置加载图像，请参阅此适配器类

import android.app.Activity; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.RatingBar; import android.widget.TextView;

import com.drapp.BaseDrawerActivity; import com.drapp.R; import com.squareup.picasso.Picasso;

import java.util.ArrayList;

公共类GridViewAdapter扩展了RecyclerView.Adapter { 私人活动活动;

Context context;
ArrayList<String> image = new ArrayList<String>();
ArrayList<String> name = new ArrayList<String>();
private static LayoutInflater inflater = null;

public GridViewAdapter(BaseDrawerActivity mainActivity, ArrayList<String> thumbnail, ArrayList<String> dish_name) {

    this.activity = mainActivity;
    this.context = mainActivity;
    image = thumbnail;
    name = dish_name;
}

public int getCount() {

    //return textnew1.length;

    int s = name.size();
    return s;
}

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

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.grid_item_layout, parent, false);
    // set the view's size, margins, paddings and layout parameters

    ViewHolder vh = new ViewHolder(v);
    return vh;


}

@Override
public void onBindViewHolder(ViewHolder holder, int position) {

    holder.productnametv.setText(name.get(position));


    if (image.get(position).equals("")) {
        holder.productimg.setImageResource(R.drawable.heart);
        holder.productimg.setVisibility(View.INVISIBLE);
    } else {
        Picasso.with(context).load(image.get(position)).into(holder.productimg);
    }

}

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

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

public static class ViewHolder extends RecyclerView.ViewHolder {
    public TextView  productnametv;
    public ImageView productimg;
    public RatingBar rating;

    public ViewHolder(View itemView) {
        super(itemView);
        productnametv = (TextView) itemView.findViewById(R.id.grid_item_label);
        productimg = (ImageView) itemView.findViewById(R.id.grid_item_image);
    }


}

}

Answer 4

如果您不想使用第三方库，请尝试此操作

 new DownloadImage(imamgeview).execute(userProfileUrl);

创建异步任务

 public class DownloadImage extends AsyncTask<String, Void, Bitmap> {
    CircleImageView bmImage;

    public DownloadImage(ImageView bmImage) {
        this.bmImage = (CircleImageView) bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.d("Error", e.getStackTrace().toString());

        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

我希望你能在你的案例中发挥作用

如何从gridview中的url加载图像

4 个答案: