安卓图片显示与网络访问

移动开发作者： 2024-08-20 01:20:01

Picasso图片显示 Square公司开源的一个Android图形缓存库Picasso实现了图片的异步加载,并解决了Android中加载图片时常见的一些问题,它有以下特点: 1.在Adapter中取

implementation 'com.squareup.picasso:picasso:2.5.2'

compile 'com.squareup.picasso:picasso:2.5.2'

<!--网络权限-->
<uses-permission android:name="android.permission.INTERNET" />
文件读写权限="android.permission.READ_EXTERNAL_STORAGE" />

private ImageView im;
im=findViewById(R.id.imageView2);
//picben("https://pic.cnblogs.com/face/1485202/20180908195218.png",im);
picben("/dongxiaodong/ww.jpg",im);

 1 参数（地址，显示的控件)
 2 public void  picben(String panx,ImageView imgviewx){
 3     File sd= Environment.getExternalStorageDirectory();得到SD卡的路径
 4     Picasso.with(MainActivity.this)
 5     .load(new File(sd,panx))文件路径,必须打开文件读写权限
 6     .load(urlx)URL,必须添加网络权限
 7     .memoryPolicy(MemoryPolicy.NO_CACHE,MemoryPolicy.NO_STORE)待测试，图片加载跳过内存缓存中查找，图片不缓存到内存缓存中
 8     .memoryPolicy(MemoryPolicy.NO_CACHE)无缓存，加下面一句可实现
 9     .networkPolicy(NetworkPolicy.NO_CACHE)
10     .placeholder(R.mipmap.mainon)正在加载图片
11     .error(R.mipmap.mainoff)尝试三次失败后 加载错误显示图片
12     .fit()填充控件与resize不可共用
13     .noFade()无淡入淡出效果
14     .resize(100,100)图片要调整后的大小，必须配合下面两个之一
15     .centerCrop()配合resize使用，仅显示被框占位
16     .centerInside()配合resize使用，裁剪后填充满控件
17     .rotate(30)旋转30度
18      .transform(new tCircle())可变为圆形状，但有黑底
19     .config(Bitmap.Config.RGB_565)比ARGB_8888 质量稍差，但看基本不出
20     .into(imgviewx);控件位置
21 }

implementation 'com.squareup.okhttp3:okhttp:3.2.0'

<!--网络权限-->
<uses-permission android:name="android.permission.INTERNET" />
<!--文件读写权限-->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

HashMap<String,String> mapx=new HashMap<String,String>();
mapx.put("yh","dongdong");
mapx.put("mm","xxxxxxx");
OKhttp.getOhttp().okpost("post.php",mapx,new OKhttp.Jkstr() {
    @Override
     jkstr(String str) {
        Toast.makeText(MainActivity.,str,Toast.LENGTH_SHORT).show();
        System.out.println(str);
    }
});

OKhttp.getOhttp().okget("post.php?dong=dongxiaodong&dong2=dongdongx",1)">    }
});

  1 package com.example.testdelete;
  2 import android.os.Environment;
  3  android.os.Handler;
  4  java.io.File;
  5  java.io.IOException;
  6  java.util.Map;
  7  okhttp3.Call;
  8  okhttp3.Callback;
  9  okhttp3.FormBody;
 10  okhttp3.MediaType;
 11  okhttp3.MultipartBody;
 12  okhttp3.OkHttpClient;
 13  okhttp3.Request;
 14  okhttp3.RequestBody;
 15  okhttp3.Response;
 16 /**
 17  * Created by 东东 on 2018/3/29.
 18  */
 19 class OKhttp {
 20      OKhttp(){};
 21     private static final OKhttp ohttp= OKhttp();
 22     static OKhttp getOhttp(){
 23         return ohttp;
 24     }
 25     private OkHttpClient client= OkHttpClient();
 26     private Handler handlerx= Handler();
 27     final String UR="http://193.110.8.6/testdelete/";
 28     File sd= Environment.getExternalStorageDirectory();得到SD卡的路径
 29     文件上传
 30     参数（上传的url,文件地址，文件名，回调函数）
 31     void okpostfile(String url,String path,String filenaem,1)">final Jkstr callbackfile) {get和post数据同时上传
 32         File file =  File(sd,path);
 33         RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"),file);
 34         RequestBody requestBody =  MultipartBody.Builder()
 35                 .setType(MultipartBody.FORM)
 36                 .addFormDataPart("mfile",filenaem,fileBody)Post参数
 37                 .build();
 38         Request request =  Request.Builder()
 39                 .url(UR+url)
 40                 .post(requestBody)
 41  42         client.newCall(request).enqueue( Callback() {
 43             @Override
 44             void onFailure(Call call,IOException e) {请求失败
 45                 ohttpstr("0" 46             }
 47  48             void onResponse(Call call,Response response) throws IOException {请求成功
 49                 ohttpstr(response.body().string(),1)"> 50  51         });
 52  53     Get请求
 54     参数（url,回调函数）
 55     void okget(String url,1)">final Jkstr callbakestr){
 56         final Request res=new Request.Builder().url(UR+url).build();
 57         client.newCall(res).enqueue( 58  59              60                 ohttpstr("0" 61                 e.printStackTrace();
 62  63  64              65                if(response.isSuccessful()){
 66                    ohttpstr(response.body().string(),1)"> 67                }
 68  69  70  71     Post请求
 72      73     void okpost(String ur,Map<String,String> mapx,1)"> Jkstr callbackform){
 74         FormBody.Builder formx= FormBody.Builder();
 75         if(mapx!=null&&!mapx.isEmpty()){
 76             for(Map.Entry<String,1)">xx:mapx.entrySet()){
 77                 formx.add(xx.getKey(),xx.getValue());
 78  79             RequestBody resbody=formx.build();
 80             Request req=ur).post(resbody).build();
 81             client.newCall(req).enqueue(new Callback() { 82                 @Override
 83                  onFailure(Call call,IOException e) {
 84                     ohttpstr("0" 85                 }
 86 
 87  88                  89                    90                       ohttpstr(response.body().string(),1)"> 91                   }
 92  93             });
 94         }
 95  96     请求返回为byte数组
 97     void ohttpbyt(final byte[] bytx,1)"> Jkbyt callbackx){
 98         handlerx.post( Runnable() {
 99 100              run() {
101                 if(callbackx!=null){
102                     try{
103                      callbackx.jkbyt(bytx);
104                     }catch (Exception e){
105                      e.printStackTrace();
106                     }
107 108 109 110 111     处理返回为string类型数据
112     void ohttpstr(final String strx,1)"> Jkstr callback){
113         handlerx.post(114 115             116                 if(callback!=117                     118                         callback.jkstr(strx.trim());
119                     }120                         e.printStackTrace();
121 122 123 124 125 126     interface Jkstr{  jkstr(String str); }
127     interface Jkbyt{void jkbyt(byte [] bytexx);}
128 }