Android之网络图片加载的5种基本方式

学了这么久，最近有空把自己用到过的网络加载图片的方式总结了出来，与大家共享，希望对你们有帮助。

此博客包含Android 5种基本的加载网络图片方式，包括普通加载HttpURLConnection、HttpClients、Volley、XUtils、OkHttp等网络加载图片。

其他网络图片加载方式，后续补上。

效果如下图：

         

HttpURLConnection方式：

public Bitmap getImageBitmap(String url) {
        URL imgUrl = ;
        Bitmap bitmap = ;
        try {
            imgUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) imgUrl
                    .openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
            is.close();
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bitmap;
}

public Bitmap getImageBitmap(String url) {
        URL imgUrl = null;
        Bitmap bitmap = null;
        try {
            imgUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) imgUrl
                    .openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
            is.close();
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bitmap;
}

HttpClient方式

public Bitmap getImageBitmap(String url) {
        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(url);
        try {
            HttpResponse resp = httpclient.execute(httpget);
            // 判断是否正确执行
            if (HttpStatus.SC_OK == resp.getStatusLine().getStatusCode()) {
                // 将返回内容转换为bitmap
                HttpEntity entity = resp.getEntity();
                InputStream in = entity.getContent();
                Bitmap mBitmap = BitmapFactory.decodeStream(in);
                // 向handler发送消息，执行显示图片操作
                return mBitmap;
            }

        } catch (Exception e) {
        } finally {
            httpclient.getConnectionManager().shutdown();
        }

        return ;
}

public Bitmap getImageBitmap(String url) {
        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(url);
        try {
            HttpResponse resp = httpclient.execute(httpget);
            // 判断是否正确执行
            if (HttpStatus.SC_OK == resp.getStatusLine().getStatusCode()) {
                // 将返回内容转换为bitmap
                HttpEntity entity = resp.getEntity();
                InputStream in = entity.getContent();
                Bitmap mBitmap = BitmapFactory.decodeStream(in);
                // 向handler发送消息，执行显示图片操作
                return mBitmap;
            }

        } catch (Exception e) {
        } finally {
            httpclient.getConnectionManager().shutdown();
        }

        return null;
}

 XUtils方式

private void initView() {
    // TODO Auto-generated method stub
    BitmapUtils bitmapUtils = new BitmapUtils(this);
    // 加载网络图片
    bitmapUtils.display(imageView,
            ”https://img-my.csdn.net/uploads/201407/26/1406383290_9329.jpg”);

    // 加载本地图片(路径以/开头， 绝对路径)
    // bitmapUtils.display(imageView, ”/sdcard/test.jpg”);

    // 加载assets中的图片(路径以assets开头)
    // bitmapUtils.display(imageView, “assets/img/wallpaper.jpg”);

  }

private void initView() {
    // TODO Auto-generated method stub
    BitmapUtils bitmapUtils = new BitmapUtils(this);
    // 加载网络图片
    bitmapUtils.display(imageView,
            "https://img-my.csdn.net/uploads/201407/26/1406383290_9329.jpg");

    // 加载本地图片(路径以/开头， 绝对路径)
    // bitmapUtils.display(imageView, "/sdcard/test.jpg");

    // 加载assets中的图片(路径以assets开头)
    // bitmapUtils.display(imageView, "assets/img/wallpaper.jpg");

  }

OkHttp方式

private void setIamge()
  {
    String url = ”https://img-my.csdn.net/uploads/201407/26/1406383291_8239.jpg”;
    OkHttpUtils.get().url(url).tag(this)
            .build()
            .connTimeOut(20000).readTimeOut(20000).writeTimeOut(20000)
            .execute(new BitmapCallback() {
            @Override
            public void onError(Call call, Exception e, int id) {
                }

            @Override
            public void onResponse(Bitmap bitmap, int id) {
                    imageView.setImageBitmap(bitmap);
                }
            });
  }

  private void setIamge()
    {
        String url = "https://img-my.csdn.net/uploads/201407/26/1406383291_8239.jpg";
        OkHttpUtils.get().url(url).tag(this)
                .build()
                .connTimeOut(20000).readTimeOut(20000).writeTimeOut(20000)
                .execute(new BitmapCallback() {
                @Override
                public void onError(Call call, Exception e, int id) {
                    }

                @Override
                public void onResponse(Bitmap bitmap, int id) {
                        imageView.setImageBitmap(bitmap);
                    }
                });
    }

Volley方式

/***
 * ImageRequest加载图片
 */
public void setImg1()
{


ImageRequest request = new ImageRequest(VolleySingleton.imageThumbUrls[0],
     new Response.Listener() {
     @Override
     public void onResponse(Bitmap bitmap) {
            imageview1.setImageBitmap(bitmap);
           }
     }, 0, 0, Config.RGB_565,
     new Response.ErrorListener() {
         public void onErrorResponse(VolleyError error) {
            imageview1.setImageResource(R.mipmap.ic_launcher);
          }
});
     VolleySingleton.getVolleySingleton(this.getApplicationContext()).addToRequestQueue(request);
}
/***
 * 使用 ImageLoader 加载图片
 */

public void setImg2()
{
    com.android.volley.toolbox.ImageLoader mImageLoader;
    mImageLoader =   VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
    mImageLoader.get(VolleySingleton.imageThumbUrls[1],
            //mImageView是ImageView实例
            //第2个参数：默认图片
            //第2个参数：加载图片错误时的图片
    com.android.volley.toolbox.ImageLoader.getImageListener(imageview2,R.mipmap.ic_launcher, R.mipmap.ic_launcher));
}
/**
 * 使用NetworkImageView加载图片
 */
public void setImg3()
{
    com.android.volley.toolbox.ImageLoader mImageLoader;
    mImageLoader = VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
    networkImageView.setImageUrl(VolleySingleton.imageThumbUrls[2], mImageLoader);
}

 /***
     * ImageRequest加载图片
     */
 public void setImg1()
 {


    ImageRequest request = new ImageRequest(VolleySingleton.imageThumbUrls[0],
         new Response.Listener() {
         @Override
         public void onResponse(Bitmap bitmap) {
                imageview1.setImageBitmap(bitmap);
               }
         }, 0, 0, Config.RGB_565,
         new Response.ErrorListener() {
             public void onErrorResponse(VolleyError error) {
                imageview1.setImageResource(R.mipmap.ic_launcher);
              }
    });
      VolleySingleton.getVolleySingleton(this.getApplicationContext()).addToRequestQueue(request);
    }
    /***
     * 使用 ImageLoader 加载图片
     */

    public void setImg2()
    {
        com.android.volley.toolbox.ImageLoader mImageLoader;
        mImageLoader =   VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
        mImageLoader.get(VolleySingleton.imageThumbUrls[1], 
                //mImageView是ImageView实例
                //第2个参数：默认图片
                //第2个参数：加载图片错误时的图片
        com.android.volley.toolbox.ImageLoader.getImageListener(imageview2,R.mipmap.ic_launcher, R.mipmap.ic_launcher));
    }
    /**
     * 使用NetworkImageView加载图片
     */
    public void setImg3()
    {
        com.android.volley.toolbox.ImageLoader mImageLoader;
        mImageLoader = VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
        networkImageView.setImageUrl(VolleySingleton.imageThumbUrls[2], mImageLoader);
    }

 相关Jar下载： Volley.Jar XUtils.Jar  httpclient-4.3.5.jar  okhttp.jar

结语：

       这五种网络图片加载是基本的，了解会使用就行了；

       其他网络图片加载方式，请看

        Android之网络图片框架UniversalImageLoader和结合LruCache缓存图片

        Android图片加载框架之Picasso非常好的图片加载缓存库

        Android之Fresco（facebook的强大Android图片加载的框架）

        Android之Glide（非常好用的图片加载框架）

源码点击下载 ：https://github.com/DickyQie/android-load-picture/tree/imageloading