Android基于OkHttp实现下载和上传图片
本文实例为大家分享了OkHttp实现下载图片和上传图片的具体代码,供大家参考,具体内容如下
MainActivity.java
publicclassMainActivityextendsAppCompatActivity{ privateStringPath="https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/"; privatestaticfinalintSUCCESS=993; privatestaticfinalintFALL=814; Handlerhandler=newHandler(){ @Override publicvoidhandleMessage(Messagemsg){ switch(msg.what){ //加载网络成功,进行UI的更新,处理得到的图片资源 caseSUCCESS: //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 Bitmapbitmap=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 caseFALL: Toast.makeText(MainActivity.this,"网络异常",Toast.LENGTH_SHORT).show(); break; default: break; } } }; privateImageViewmImageView_okhttp; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化控件 initView(); } privatevoidinitView(){ 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 * *@paramview */ publicvoidPicture_okhttp_bt(Viewview){ //1.创建OKhttpClient对象 OkHttpClientokHttpClient=newOkHttpClient(); //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 Requestrequest=newRequest.Builder() .url(Path)//设置请求网址 .build();//建立request对象 //3.创建一个Call对象,参数是request对象,发送请求 Callcall=okHttpClient.newCall(request); //4.异步请求,请求加入调度 call.enqueue(newCallback(){ @Override//请求失败回调 publicvoidonFailure(Callcall,IOExceptione){ handler.sendEmptyMessage(FALL); } @Override//请求成功回调 publicvoidonResponse(Callcall,Responseresponse)throwsIOException{ //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 Messagemessage=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一个Key,如果开发中关于网络这一块出现问题,就多和面试官沟通沟通 publicvoiduploading(Viewview){ //图片上传接口地址 Stringurl="https://www.718shop.com/sell/sell.m.picture.upload.do"; //创建上传文件对象 Filefile=newFile(Environment.getExternalStorageDirectory(),"big.jpg"); //创建RequestBody封装参数 RequestBodyfileBody=RequestBody.create(MediaType.parse("application/octet-stream"),file); //创建MultipartBody,给RequestBody进行设置 MultipartBodymultipartBody=newMultipartBody.Builder() .setType(MultipartBody.FORM) .addFormDataPart("image","big.jpg",fileBody) .build(); //创建Request Requestrequest=newRequest.Builder() .url(url) .post(multipartBody) .build(); //创建okhttp对象 OkHttpClientokHttpClient=newOkHttpClient.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(newCallback(){ @Override publicvoidonFailure(Callcall,IOExceptione){ Log.e("ff","uploadMultiFile()e="+e); } @Override publicvoidonResponse(Callcall,Responseresponse)throwsIOException{ Log.i("ff","uploadMultiFile()response="+response.body().string()); } }); } }
activity_main.xml
build.gradle//依赖
implementation'com.squareup.okhttp3:okhttp:3.4.2'
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持毛票票。