public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private Button btn_up;
private Button btn_drown;
private ImageView img;
private String path ="https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/";
private String url ="https://www.718shop.com/sell/sell.m.picture.upload.do";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化控制元件
     initView();
    //設定點選事件
     btn_drown.setOnClickListener(this);
     btn_up.setOnClickListener(this);

    
}

private void initView() {
    btn_up = findViewById(R.id.btn_up);
    btn_drown = findViewById(R.id.btn_drown);
    img = findViewById(R.id.img);
}
 

//點選事件 @Override public void onClick(View v) { switch (v.getId()){ case R.id.btn_up: // Log.i(“123”,“上傳照片”); File file = new File(Environment.getExternalStorageDirectory()+"/Download","/head.jpg"); // RequestBody body = RequestBody.create(MediaType.parse(“application/octet_stream”),file);

            MultipartBody multipartBody = new MultipartBody.Builder()
                    .setType(MultipartBody.FORM)
                    .addFormDataPart("image", "start.jpg", body)
                    .build();
            final Request request = new Request.Builder()
                    .url(url)
                    .post(multipartBody)
                    .build();
            new OkHttpClient.Builder()
                    .writeTimeout(10, TimeUnit.SECONDS)
                    .readTimeout(10, TimeUnit.SECONDS)
                    .connectTimeout(10, TimeUnit.SECONDS)
                    .build().newCall(request).enqueue(new Callback() {
                        @Override
                        public void onFailure(Call call, IOException e) {

                        }
                        @Override
                        public void onResponse(Call call, Response response) throws IOException {
                            Log.e("123", "上傳成功");
                        }
                    });


            break;
        case R.id.btn_drown:
           // Log.i("123","下載照片");
            //建立OKHttp物件
            OkHttpClient okHttpClient = new OkHttpClient.Builder()
                    .writeTimeout(10, TimeUnit.SECONDS)
                    .readTimeout(10, TimeUnit.SECONDS)
                    .connectTimeout(10, TimeUnit.SECONDS)
                    .build();
           //建立request物件
            Request request1 = new Request.Builder()
                    .url(path)
                    .build();
            //建立call物件
            Call call = okHttpClient.newCall(request1);

            call.enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {

                }

                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    final byte[] pinture = response.body().bytes();
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Bitmap bitmap = BitmapFactory.decodeByteArray(pinture, 0, pinture.length);
                            img.setImageBitmap(bitmap);
                        }
                    });
                }
            });
            break;
    }
}
 

}