网络请求数据添加到列表（okhttp+RecyclerView）
来源：互联网 发布：网络发国际传真 编辑：程序博客网 时间：2024/06/05 06:59
okthpp实现步骤：
1.导包
//butterKnifecompile 'com.jakewharton:butterknife:8.4.0'apt 'com.jakewharton:butterknife-compiler:8.4.0'//okhttpcompile 'com.squareup.okio:okio:1.5.0'compile 'com.squareup.okhttp3:okhttp:3.2.0'compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'compile 'com.google.code.gson:gson:2.8.2'//Recyclerviewcompile 'com.android.support:recyclerview-v7:22.1.1'compile 'com.android.support:appcompat-v7:22.1.1'compile files('libs/universal-image-loader-1.9.3.jar')
2.添加权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>4.在布局文件里面设置RecyclerView控件<android.support.v7.widget.RecyclerView android:id="@+id/id_recyclerview" android:divider="#ffff0000" android:dividerHeight="10dp" android:layout_width="match_parent" android:layout_height="match_parent" />5、写一个item布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content"> <TextView android:id="@+id/texts" android:layout_width="match_parent" android:layout_height="50dp" android:background="#f0f" android:gravity="center" android:textSize="20sp" /></LinearLayout>
6.分装一个Bean类
public class Bean { private int code; private List<Data> data; private String msg; public Bean(int code, List<Data> data, String msg) { this.code = code; this.data = data; this.msg = msg; } public int getCode() { return code; } public void setCode(int code) { this.code = code; } public List<Data> getData() { return data; } public void setData(List<Data> data) { this.data = data; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } @Override public String toString() { return "Bean{" + "code=" + code + ", data=" + data + ", msg='" + msg + '\'' + '}'; } public class Data { private int id; private String efficacy; private String goods_img; public Data(int id, String efficacy, String goods_img) { this.id = id; this.efficacy = efficacy; this.goods_img = goods_img; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getEfficacy() { return efficacy; } public void setEfficacy(String efficacy) { this.efficacy = efficacy; } public String getGoods_img() { return goods_img; } public void setGoods_img(String goods_img) { this.goods_img = goods_img; } @Override public String toString() { return "Data{" + "id=" + id + ", efficacy='" + efficacy + '\'' + ", goods_img='" + goods_img + '\'' + '}'; } }}
6.Okhttp工具类GsonArrayCallback：import android.os.Handler;import com.google.gson.Gson;import com.google.gson.JsonArray;import com.google.gson.JsonElement;import com.google.gson.JsonParser;import java.io.IOException;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.List;import okhttp3.Call;import okhttp3.Callback;import okhttp3.Response;
public abstract class GsonArrayCallback<T> implements Callback { private Handler handler = OkHttp3Utils.getInstance().getHandler(); //主线程处理 public abstract void onUi(List<T> list); //主线程处理 public abstract void onFailed(Call call, IOException e); //请求失败 @Override public void onFailure(final Call call, final IOException e) { handler.post(new Runnable() { @Override public void run() { onFailed(call, e); } }); } //请求json 并直接返回集合 主线程处理 @Override public void onResponse(Call call, Response response) throws IOException { final List<T> mList = new ArrayList<T>(); String json = response.body().string(); JsonArray array = new JsonParser().parse(json).getAsJsonArray(); Gson gson = new Gson(); Class<T> cls = null; Class clz = this.getClass(); ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass(); Type[] types = type.getActualTypeArguments(); cls = (Class<T>) types[0]; for(final JsonElement elem : array){ //循环遍历把对象添加到集合 mList.add((T) gson.fromJson(elem, cls)); } handler.post(new Runnable() { @Override public void run() { onUi(mList); } }); }}GsonObjectCallback：public abstract class GsonObjectCallback<T> implements Callback { private Handler handler = OkHttp3Utils.getInstance().getHandler(); //主线程处理 public abstract void onUi(T t); //主线程处理 public abstract void onFailed(Call call, IOException e); //请求失败 @Override public void onFailure(final Call call, final IOException e) { handler.post(new Runnable() { @Override public void run() { onFailed(call, e); } }); } //请求json 并直接返回泛型的对象 主线程处理 @Override public void onResponse(Call call, Response response) throws IOException { String json = response.body().string(); Class<T> cls = null; Class clz = this.getClass(); ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass(); Type[] types = type.getActualTypeArguments(); cls = (Class<T>) types[0]; Gson gson = new Gson(); final T t = gson.fromJson(json, cls); handler.post(new Runnable() { @Override public void run() { onUi(t); } }); }}NetWorkUtils：public class NetWorkUtils { //判断网络是否连接 public static boolean isNetWorkAvailable(Context context) { //网络连接管理器 ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); //网络信息 NetworkInfo info = connectivityManager.getActiveNetworkInfo(); if (info != null) { return true; } return false; }}OkHttp3Utils：MyApp:public class OkHttp3Utils { /** * 懒汉 安全 加同步 * 私有的静态成员变量 只声明不创建 * 私有的构造方法 * 提供返回实例的静态方法 */ private static OkHttp3Utils okHttp3Utils = null; private OkHttp3Utils() { } public static OkHttp3Utils getInstance() { if (okHttp3Utils == null) { //加同步安全 synchronized (OkHttp3Utils.class) { if (okHttp3Utils == null) { okHttp3Utils = new OkHttp3Utils(); } } } return okHttp3Utils; } private static OkHttpClient okHttpClient = null; public synchronized static OkHttpClient getOkHttpClient() { if (okHttpClient == null) { //判空 为空创建实例 // okHttpClient = new OkHttpClient();/** * 和OkHttp2.x有区别的是不能通过OkHttpClient直接设置超时时间和缓存了，而是通过OkHttpClient.Builder来设置， * 通过builder配置好OkHttpClient后用builder.build()来返回OkHttpClient， * 所以我们通常不会调用new OkHttpClient()来得到OkHttpClient，而是通过builder.build()： */ // File sdcache = getExternalCacheDir(); //缓存目录 File sdcache = new File(Environment.getExternalStorageDirectory(), "cache"); int cacheSize = 10 * 1024 * 1024; //OkHttp3拦截器 HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() { @Override public void log(String message) { Log.i("xxx", message.toString()); } }); //Okhttp3的拦截器日志分类 4种 httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY); okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS) //添加OkHttp3的拦截器 .addInterceptor(httpLoggingInterceptor) .addNetworkInterceptor(new CacheInterceptor()) .writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS) .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize)) .build(); } return okHttpClient; } private static Handler mHandler = null; public synchronized static Handler getHandler() { if (mHandler == null) { mHandler = new Handler(); } return mHandler; } /** * get请求 * 参数1 url * 参数2 回调Callback */ public static void doGet(String url, Callback callback) { //创建OkHttpClient请求对象 OkHttpClient okHttpClient = getOkHttpClient(); //创建Request Request request = new Request.Builder().url(url).build(); //得到Call对象 Call call = okHttpClient.newCall(request); //执行异步请求 call.enqueue(callback); } /** * post请求 * 参数1 url * 参数2 回调Callback */ public static void doPost(String url, Map<String, String> params, Callback callback) { //创建OkHttpClient请求对象 OkHttpClient okHttpClient = getOkHttpClient(); //3.x版本post请求换成FormBody 封装键值对参数 FormBody.Builder builder = new FormBody.Builder(); //遍历集合 for (String key : params.keySet()) { builder.add(key, params.get(key)); } //创建Request Request request = new Request.Builder().url(url).post(builder.build()).build(); Call call = okHttpClient.newCall(request); call.enqueue(callback); } /** * post请求上传文件 * 参数1 url * 参数2 回调Callback */ public static void uploadPic(String url, File file, String fileName) { //创建OkHttpClient请求对象 OkHttpClient okHttpClient = getOkHttpClient(); //创建RequestBody 封装file参数 RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file); //创建RequestBody 设置类型等 RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", fileName, fileBody).build(); //创建Request Request request = new Request.Builder().url(url).post(requestBody).build(); //得到Call Call call = okHttpClient.newCall(request); //执行请求 call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { //上传成功回调 目前不需要处理 } }); } /** * Post请求发送JSON数据 * 参数一：请求Url * 参数二：请求的JSON * 参数三：请求回调 */ public static void doPostJson(String url, String jsonParams, Callback callback) { RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams); Request request = new Request.Builder().url(url).post(requestBody).build(); Call call = getOkHttpClient().newCall(request); call.enqueue(callback); } /** * 下载文件 以流的形式把apk写入的指定文件 得到file后进行安装 * 参数一：请求Url * 参数二：保存文件的路径名 * 参数三：保存文件的文件名 */ public static void download(final Context context, final String url, final String saveDir) { Request request = new Request.Builder().url(url).build(); Call call = getOkHttpClient().newCall(request); call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { Log.i("xxx", e.toString()); } @Override public void onResponse(Call call, final Response response) throws IOException { InputStream is = null; byte[] buf = new byte[2048]; int len = 0; FileOutputStream fos = null; try { is = response.body().byteStream(); //apk保存路径 final String fileDir = isExistDir(saveDir); //文件 File file = new File(fileDir, getNameFromUrl(url)); fos = new FileOutputStream(file); while ((len = is.read(buf)) != -1) { fos.write(buf, 0, len); } fos.flush(); //apk下载完成后 调用系统的安装方法 Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive"); context.startActivity(intent); } catch (IOException e) { e.printStackTrace(); } finally { if (is != null) is.close(); if (fos != null) fos.close(); } } }); } /** * @param saveDir * @return * @throws IOException 判断下载目录是否存在 */ public static String isExistDir(String saveDir) throws IOException { // 下载位置 if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir); if (!downloadFile.mkdirs()) { downloadFile.createNewFile(); } String savePath = downloadFile.getAbsolutePath(); Log.e("savePath", savePath); return savePath; } return null; } /** * @param url * @return 从下载连接中解析出文件名 */ private static String getNameFromUrl(String url) { return url.substring(url.lastIndexOf("/") + 1); } /** * 为okhttp添加缓存，这里是考虑到服务器不支持缓存时，从而让okhttp支持缓存 */ private static class CacheInterceptor implements Interceptor { @Override public Response intercept(Chain chain) throws IOException { // 有网络时 设置缓存超时时间1个小时 int maxAge = 60 * 60; // 无网络时，设置超时为1天 int maxStale = 60 * 60 * 24; Request request = chain.request(); if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) { //有网络时只从网络获取 request = request.newBuilder().cacheControl(CacheControl.FORCE_NETWORK).build(); } else { //无网络时只从缓存中读取 request = request.newBuilder().cacheControl(CacheControl.FORCE_CACHE).build(); /* Looper.prepare(); Toast.makeText(MyApp.getInstance(), "走拦截器缓存", Toast.LENGTH_SHORT).show(); Looper.loop();*/ } Response response = chain.proceed(request); if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) { response = response.newBuilder() .removeHeader("Pragma") .header("Cache-Control", "public, max-age=" + maxAge) .build(); } else { response = response.newBuilder() .removeHeader("Pragma") .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale) .build(); } return response; } }}public class MyApp extends Application { public static MyApp mInstance; @Override public void onCreate() { super.onCreate(); mInstance = this; //解析图片的 //ImageLoaderConfiguration aDefault = ImageLoaderConfiguration.createDefault(getApplicationContext()); //ImageLoader.getInstance().init(aDefault); } public static MyApp getInstance() { return mInstance; }}
MainActivity:http://blog.csdn.net/lmj623565791/article/details/45059587public class MainActivity extends AppCompatActivity { String path; TextView text; private RecyclerView mRecyclerView; private ArrayList<User.NewslistBean> mDatas; private HomeAdapter mAdapter; private static final int SUCCESS = 1; private static final int FALL = 2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); path="http://api.tianapi.com/social/?key=71e58b5b2f930eaf1f937407acde08fe&num=20"; text = (TextView) findViewById(R.id.text); mDatas=new ArrayList<>(); mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview); boolean netWorkAvailable = NetWorkUtils.isNetWorkAvailable(this); if (!netWorkAvailable) { Toast.makeText(MainActivity.this, "联网：" + netWorkAvailable, Toast.LENGTH_SHORT).show(); } getData(); mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST)); mRecyclerView.setAdapter(mAdapter = new HomeAdapter());// mRecyclerView.setLayoutManager(new GridLayoutManager(this,4));// mRecyclerView.addItemDecoration(new DividerGridItemDecoration(this));// mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL)); } //get的请求 private void getData() { OkHttp3Utils.getInstance().doGet(path, new GsonObjectCallback<User>() { @Override public void onUi(User user) { for(int i=0;i<user.getNewslist().size();i++){ String title = user.getNewslist().get(i).getTitle(); String image = user.getNewslist().get(i).getPicUrl(); mDatas.add(new User.NewslistBean(title,image)); } } @Override public void onFailed(Call call, IOException e) { } }); }//RecyclerView的适配器 class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder> { @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { MyViewHolder holder = new MyViewHolder(LayoutInflater.from( MainActivity.this).inflate(R.layout.item_home, parent, false)); return holder; } @Override public void onBindViewHolder(MyViewHolder holder, int position) { holder.tv.setText(mDatas.get(position).getTitle()); ImageLoader.getInstance().displayImage(mDatas.get(position).getPicUrl(),holder.image); } @Override public int getItemCount() { return mDatas.size(); } class MyViewHolder extends ViewHolder { TextView tv; ImageView image; public MyViewHolder(View view) { super(view); tv = (TextView) view.findViewById(R.id.id_num); image = (ImageView) view.findViewById(R.id.image); } } }}
//RecyclerView就不详细介绍了，推荐此链接：
希望对有的人有所帮助
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