ImageLoadAsyncTask

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package baway.com.imagloadasynctask.utils;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
* 类的作用：
* 作者：岳俊飞
* 时间：2017/4/14
*/

public class ImageLoadAsyncTask extends AsyncTask<String, Void, Bitmap> {
    /**
     * 定义一个图片的接口回调
     */
    public interface ImageCallBack {
        void callBitmap(Bitmap bitmap);
    }

//定义变量记住调用者所传递进来的回调监听对象
private ImageCallBack imageCallBack;

    //构造方法
    public ImageLoadAsyncTask(ImageCallBack imageCallBack)
    {
        this.imageCallBack = imageCallBack;
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        super.onPostExecute(bitmap);
        if (bitmap != null) {
            //设置图片回调回去
            imageCallBack.callBitmap(bitmap);
        }

}

    @Override
    protected Bitmap doInBackground(String... params) {
        try {
            String path = params[0];
            URL url = new URL(path);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setReadTimeout(5000);
            connection.setConnectTimeout(5000);
            int code = connection.getResponseCode();
            if (code == HttpURLConnection.HTTP_OK) {
                //图片流
                InputStream inputStream = connection.getInputStream();
                //将图片流转化成Bitmap位图，返回
                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                return bitmap;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

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