OkHttp+MVP实现RecycleView显示数据
封装的OkHttp
package bwie.com.mvpokhttprecyclerview.okhttp_modle; import android.os.Handler; import android.util.Log; import java.io.IOException; import java.util.Map; import okhttp3.Call; import okhttp3.FormBody; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; /** * Author: J & J * Time:2017/11/10 * Effect:OkHttp类 **/ public class HttpUtils { private static final String TAG = "HttpUtils"; private static volatile HttpUtils instance; public static Handler handler = new Handler(); public static HttpUtils getInstance() { if (null == instance) { synchronized (HttpUtils.class) { if (instance == null) { instance = new HttpUtils(); } } } return instance; } /** * 对外提供的get请求 * @param url * @param map * @param callback * @param cls * @param tag **/ public void get(String url, Map<String, String> map, final Callback callback, final Class cls, final String tag) { // 对url和参数做一下拼接处理 // http://www.baidu.com/login?name=zs StringBuffer sb = new StringBuffer(); sb.append(url); // 如果存在? if (sb.indexOf("?") != -1) { // 如果?不在最后一位 if (sb.indexOf("?") != sb.length() - 1) { sb.append("&"); } } else { sb.append("?"); } for (Map.Entry<String, String> entry : map.entrySet()) { sb.append(entry.getKey()) .append("=") .append(entry.getValue()) .append("&"); } if (sb.indexOf("&") != -1) { sb.deleteCharAt(sb.lastIndexOf("&")); } Log.i(TAG, "get url: " + sb); OkHttpClient client = new OkHttpClient(); final Request request = new Request.Builder() .get() .url(sb.toString()) .build(); Call call = client.newCall(request); call.enqueue(new okhttp3.Callback() { @Override public void onFailure(Call call, final IOException e) { Log.e(TAG, "onFailure: " + e.getCause().getStackTrace() + e.getMessage()); handler.post(new Runnable() { @Override public void run() { callback.onshibai(tag, e); } }); } @Override public void onResponse(Call call, Response response) throws IOException { String result = response.body().string(); Log.i(TAG, "onResponse: " + result); final Object o = GsonUtils.getInstance().fromJson(result, cls); handler.post(new Runnable() { @Override public void run() { callback.oncheng(tag, o); } }); } }); } /** * 封装的post请求 * * @param url * @param map * @param callback * @param cls */ public void post(String url, Map<String, String> map, final Callback callback, final Class cls, final String tag) { OkHttpClient client = new OkHttpClient(); FormBody.Builder builder = new FormBody.Builder(); for (Map.Entry<String, String> entry : map.entrySet()) { builder.add(entry.getKey(), entry.getValue()); } FormBody body = builder.build(); final Request request = new Request.Builder() .url(url) .post(body) .build(); Call call = client.newCall(request); call.enqueue(new okhttp3.Callback() { @Override public void onFailure(Call call, final IOException e) { Log.e(TAG, "onFailure: " + e.getCause().getStackTrace() + e.getMessage()); handler.post(new Runnable() { @Override public void run() { callback.onshibai(tag, e); } }); } @Override public void onResponse(Call call, Response response) throws IOException { String result = response.body().string(); Log.i(TAG, "onResponse: " + result); final Object o = GsonUtils.getInstance().fromJson(result, cls); handler.post(new Runnable() { @Override public void run() { callback.oncheng(tag, o); } }); } }); } } ===============================
package bwie.com.mvpokhttprecyclerview.okhttp_modle; import com.google.gson.Gson; /**
* Author: J & J * Time:2017/11/10 * Effect: **/
public class GsonUtils { private static Gson gson; public static Gson getInstance() { if (gson == null) { gson = new Gson(); } return gson; } }==============================
package bwie.com.mvpokhttprecyclerview.okhttp_modle; /** * Author: J & J * Time:2017/11/10 * Effect:OkHttp的接口 **/ public interface Callback { //失败 void onshibai(String tag,Exception e); //成功 void oncheng(String tag,Object o); } =============================
V层 视图层
package bwie.com.mvpokhttprecyclerview.view; import java.util.List; import bwie.com.mvpokhttprecyclerview.bean.NewsBean; /** * Author: J & J * Time:2017/11/10 * Effect:视图的接口 **/ public interface INewsView { //失败 void failed(String tag, Exception e); //成功 void success(List<NewsBean.NewslistBean> data); } ============================
package bwie.com.mvpokhttprecyclerview.view; import java.util.List; import bwie.com.mvpokhttprecyclerview.bean.NewsBean; /** * Author: J & J * Time:2017/11/10 * Effect:视图的接口 **/ public interface INewsView { //失败 void failed(String tag, Exception e); //成功 void success(List<NewsBean.NewslistBean> data); } ====================================
package bwie.com.mvpokhttprecyclerview.view; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.Log; import java.util.ArrayList; import java.util.List; import bwie.com.mvpokhttprecyclerview.R; import bwie.com.mvpokhttprecyclerview.adapter.NewsListAdapter; import bwie.com.mvpokhttprecyclerview.bean.NewsBean; import bwie.com.mvpokhttprecyclerview.presenter.NewsPresenter; /** * Author: J & J * Time:2017/11/10 * Effect: **/ public class MainActivity extends AppCompatActivity implements INewsView { private static final String TAG = "MainActivity"; private RecyclerView recyclerView; private NewsListAdapter adapter; private List<NewsBean.NewslistBean> list; private NewsPresenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recyclerView = (RecyclerView) findViewById(R.id.rv_news); presenter = new NewsPresenter(); presenter.attachView(this); list = new ArrayList<>(); adapter = new NewsListAdapter(this, list); LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this); recyclerView.setLayoutManager(linearLayoutManager); recyclerView.setAdapter(adapter); presenter.getNews(); } @Override public void failed(String tag, Exception e) { Log.i("========", "failed:" + e.getMessage()); } @Override public void success(List<NewsBean.NewslistBean> news) { Log.i("========", "success:" + news); if (news != null) { list.addAll(news); adapter.notifyDataSetChanged(); } } @Override protected void onDestroy() { super.onDestroy(); presenter.detachView(); } } =========================Adapter类
package bwie.com.mvpokhttprecyclerview.adapter; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import com.bumptech.glide.Glide; import java.util.List; import bwie.com.mvpokhttprecyclerview.R; import bwie.com.mvpokhttprecyclerview.bean.NewsBean; /** * Author: J & J * Time:2017/11/10 * Effect: **/ public class NewsListAdapter extends RecyclerView.Adapter<NewsListAdapter.ViewHolder> { private Context context; private List<NewsBean.NewslistBean> list; public NewsListAdapter(Context context, List<NewsBean.NewslistBean> list) { this.context = context; this.list = list; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = View.inflate(context, R.layout.item_news, null); ViewHolder viewHolder = new ViewHolder(v); return viewHolder; } @Override public void onBindViewHolder(ViewHolder holder, int position) { Glide.with(context).load(list.get(position).getPicUrl()).into(holder.imageView); holder.txtTime.setText(list.get(position).getCtime()); holder.txtTitle.setText(list.get(position).getTitle()); } @Override public int getItemCount() { return list.size(); } class ViewHolder extends RecyclerView.ViewHolder { private ImageView imageView; private TextView txtTitle; private TextView txtTime; public ViewHolder(View itemView) { super(itemView); txtTime = (TextView) itemView.findViewById(R.id.txt_time); txtTitle = (TextView) itemView.findViewById(R.id.txt_title); imageView = (ImageView) itemView.findViewById(R.id.img_logo); } } } ======================== P层 用于模型层和视图层进行数据交互
package bwie.com.mvpokhttprecyclerview.presenter; import android.util.Log; import java.util.HashMap; import java.util.List; import java.util.Map; import bwie.com.mvpokhttprecyclerview.bean.NewsBean; import bwie.com.mvpokhttprecyclerview.okhttp_modle.Callback; import bwie.com.mvpokhttprecyclerview.okhttp_modle.HttpUtils; import bwie.com.mvpokhttprecyclerview.view.INewsView; /** * Author: J & J * Time:2017/11/10 * Effect:模型层和视图层的桥梁 **/ public class NewsPresenter { private INewsView inv; public void attachView(INewsView inv) { this.inv = inv; } //进行网络请求 public void getNews() { //http://api.tianapi.com/meinv/?key=4a82473783694ddebd495d47b16c906e&num=10 //创建map集合 用于存放接口对接的值 Map<String, String> map = new HashMap<>(); // key=0ebe1b7e56a73c2bf2e68b76342c5a65&num=50 map.put("key", "4a82473783694ddebd495d47b16c906e"); map.put("num", "50"); HttpUtils.getInstance().get("http://api.tianapi.com/meinv/", map, new Callback() { //网络请求失败时 @Override public void onshibai(String tag, Exception e) { Log.i("===========", "onshibai: "); //调用失败的方法 inv.failed(tag, e); } //请求成功是 @Override public void oncheng(String tag, Object o) { Log.i("===========", "oncheng: "); NewsBean bean = (NewsBean) o; if (bean != null) { List<NewsBean.NewslistBean> data = bean.getNewslist(); //调用成功的方法 inv.success(data); } } }, NewsBean.class, "tag"); } public void detachView() { if (inv != null) { inv = null; } } } 添加权限
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>注入依赖----常用
repositories { mavenCentral() maven { url 'https://maven.google.com' } } dependencies { compile fileTree(include: ['*.jar'], dir: 'libs') androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:25.3.1' compile 'com.android.support.constraint:constraint-layout:1.0.2' compile 'com.squareup.okhttp3:okhttp:3.9.0' compile 'com.google.code.gson:gson:2.8.1' compile 'com.github.bumptech.glide:glide:4.3.1' annotationProcessor 'com.github.bumptech.glide:compiler:4.3.1' testCompile 'junit:junit:4.12' compile 'com.android.support:recyclerview-v7:25.3.1' }
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