Android downloads and uploads pictures based on OkHttp

This article example for everyone to share OkHttp to achieve download pictures and upload pictures of the specific code, for your reference, the specific content is as follows

MainActivity.java

public class MainActivity extends AppCompatActivity {

  private String Path = "https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/";
  private static final int SUCCESS = 993;
  private static final int FALL = 814;
  Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      switch (msg.what) {
        //加载网络成功,进行UI的更新,处理得到的图片资源
        case SUCCESS:
          //通过message,拿到字节数组
          byte[] Picture = (byte[]) msg.obj;
          //使用BitmapFactory工厂,把字节数组转换为bitmap
          Bitmap bitmap = BitmapFactory.decodeByteArray(Picture, 0, Picture.length);
          //通过ImageView,设置图片
          mImageView_okhttp.setImageBitmap(bitmap);
          break;
        //当加载网络失败,执行的逻辑代码
        case FALL:
          Toast.makeText(MainActivity.this, "网络异常", Toast.LENGTH_SHORT).show();
          break;

        default:
          break;
      }
    }
  };
  private ImageView mImageView_okhttp;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化控件
    initView();
  }

  private void initView() {
    mImageView_okhttp = (ImageView) findViewById(R.id.imageView_okhttp);
  }

  /**
   * 根据点击事件获取络上的图片资源,使用的是OKhttp框架
   *
   * @param view
   */
  public void Picture_okhttp_bt(View view) {
    //1. 创建OKhttpClient对象
    OkHttpClient okHttpClient = new OkHttpClient();
    //2.建立Request对象,设置参数,请求方式如果是get,就不用设置,默认使用的就是get
    Request request = new Request.Builder()
        .url(Path)//设置请求网址
        .build();//建立request对象
    //3.创建1个Call对象,参数是request对象,发送请求
    Call call = okHttpClient.newCall(request);
    //4.异步请求,请求加入调度
    call.enqueue(new Callback() {
      @Override//请求失败回调
      public void onFailure(Call call, IOException e) {
        handler.sendEmptyMessage(FALL);
      }

      @Override//请求成功回调
      public void onResponse(Call call, Response response) throws IOException {
        //得到从网上获取资源,转换成我们想要的类型
        byte[] Picture_bt = response.body().bytes();
        //通过handler更新UI
        Message message = handler.obtainMessage();
        message.obj = Picture_bt;
        message.what = SUCCESS;
        handler.sendMessage(message);

      }
    });
  }

  //当按钮点击时,执行使用OKhttp上传图片到服务器(http://blog.csdn.net/tangxl2008008/article/details/51777355)
  //注意:有时候上传图片失败,是服务器规定还要上传1个Key,如果开发中关于网络这1块出现问题,就多和面试官沟通沟通
  public void uploading(View view) {
    //图片上传接口地址
    String url = "https://www.718shop.com/sell/sell.m.picture.upload.do";
    //创建上传文件对象
    File file = new File(Environment.getExternalStorageDirectory(), "big.jpg");

    //创建RequestBody封装参数
    RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);
    //创建MultipartBody,给RequestBody进行设置
    MultipartBody multipartBody = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("image", "big.jpg", fileBody)
        .build();
    //创建Request
    Request request = new Request.Builder()
        .url(url)
        .post(multipartBody)
        .build();

    //创建okhttp对象
    OkHttpClient okHttpClient = new OkHttpClient.Builder()
        .connectTimeout(10, TimeUnit.SECONDS)
        .readTimeout(10, TimeUnit.SECONDS)
        .writeTimeout(10, TimeUnit.SECONDS)
        .build();

    //上传完图片,得到服务器反馈数据
    okHttpClient.newCall(request).enqueue(new Callback() {
      @Override
      public void onFailure(Call call, IOException e) {
        Log.e("ff", "uploadMultiFile() e=" + e);
      }

      @Override
      public void onResponse(Call call, Response response) throws IOException {
        Log.i("ff", "uploadMultiFile() response=" + response.body().string());
      }
    });


  }

}

activity_main.xml

<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="com.sn.picture_okhttp.MainActivity">


  <Button
    android:id="@+id/button"
    android:onClick="Picture_okhttp_bt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text=" Download pictures "
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="59dp"/>

  <Button
    android:text=" Upload pictures "
    android:onClick="uploading"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button2"
    android:layout_alignParentTop="true"
    android:layout_alignLeft="@+id/button"
    android:layout_alignStart="@+id/button"/>

  <ImageView
    android:id="@+id/imageView_okhttp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"/>

</RelativeLayout>

build. gradle//Dependence

implementation 'com.squareup.okhttp3:okhttp:3.4.2'