ok封装和解析json封装

OkHttp3Utils

import android.os.Environment;
import android.os.Handler;

import java.io.File;
import java.util.concurrent.TimeUnit;

import okhttp3.Cache;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;

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 OkHttp3UtilsokHttp3Utils = null;

private OkHttp3Utils() {
}

public static OkHttp3UtilsgetInstance() {
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) {
File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
int cacheSize = 10 * 1024 * 1024;
//拦截器

okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS)
//添加OkHttp3的拦截器
.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);

}

}

GsonObjectCallback

import android.os.Handler;

import com.google.gson.Gson;

import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

/**
* 1. 类的用途 如果要将得到的json直接转化为集合 建议使用该类
* 该类的onUi() onFailed()方法运行在主线程
*
*/

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 {
//如果返回的数据超过1M就不要使用string方法，这样会把数据全部加载到内存中，应该使用流；
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);
}
});
}
}

//使用

private void getData() {
OkHttp3Utils.doGet("http://news-at.zhihu.com/api/4/theme/11", new GsonObjectCallback<NewsBean>() {
@Override
public void onUi(NewsBean userBean) {
Toast.makeText(MainActivity.this, userBean.getName(), Toast.LENGTH_SHORT).show();
Toast.makeText(MainActivity.this, userBean.getImage(), Toast.LENGTH_SHORT).show();
}

@Override
public void onFailed(Call call, IOException e) {
}
});
}

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;

/**
* 1. 类的用途 如果要将得到的json直接转化为集合 建议使用该类
* 该类的onUi() onFailed()方法运行在主线程
* 2. @author forever
* 3. @date 2017/9/24 18:47
*/

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);

}
});

}
}