Android--Retrofit+RxJava的简单封装（三）
1，继续接着上一篇的讲讲，话说如果像上一篇这样的话，那么我们每一次请求一个结构都要创建一堆的Retrofit对象，而且代码都是相同的，我们可以试试封装一下
先创建一个HttpMethods类，将Retrofit对象创建封装起来
HttpMethods.java
package com.qianmo.retrofitdemo.http;
import com.qianmo.retrofitdemo.entry.MovieEntity;
import java.util.concurrent.TimeUnit;
import okhttp3.OkHttpClient;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
/**
* Created by wangjitao on 2016/11/3 0003.
* 对Retrofit的的简单封装
*/
public class HttpMethods {
public static final String BASE_URL = "https://api.douban.com/v2/movie/";
private static final int DEFAULT_TIMEOUT = 5;
private Retrofit retrofit;
private MovieService movieService;
//先构造私有的构造方法
private HttpMethods() {
//手动创建一个OkHttpClient并设置超时时间
OkHttpClient.Builder httpClientBuilder = new OkHttpClient.Builder();
httpClientBuilder.connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);
retrofit = new Retrofit.Builder()
.client(httpClientBuilder.build())
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.baseUrl(BASE_URL)
.build();
movieService = retrofit.create(MovieService.class);
}
//创建单例
public static class SingleonHolder {
private static final HttpMethods instance = new HttpMethods();
}
//获取单例
public static HttpMethods getInstance() {
return SingleonHolder.instance;
}
/**
*
* @param start 起始位置
* @param count 获取长度
* @param subscriber 传递过来的观察者对象
*/
public void getTopMovie(int start, int count, Subscriber<MovieEntity> subscriber) {
movieService.getTopMovie(start, count)
.subscribeOn(Schedulers.io())
.unsubscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(subscriber);
}
}
在直接在Activity中进行调用
package com.qianmo.retrofitdemo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.qianmo.retrofitdemo.entry.MovieEntity;
import com.qianmo.retrofitdemo.http.HttpMethods;
import com.qianmo.retrofitdemo.http.MovieService;
import butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
public class MainActivity extends AppCompatActivity {
@Bind(R.id.tv_show)
TextView tvShow;
@Bind(R.id.btn_request)
Button btnRequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
}
@OnClick({R.id.btn_request})
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_request:
getMovie();
break;
}
}
//请求网络数据
private void getMovie() {
// //https://api.douban.com/v2/movie/top250?start=0&count=10 目标地址
// String baseUrl = "https://api.douban.com/v2/movie/";
//
// //创建Retrofit对象
// Retrofit retrofit = new Retrofit.Builder()
// .baseUrl(baseUrl)
// .addConverterFactory(GsonConverterFactory.create())
// .build();
//
// MovieService movieService = retrofit.create(MovieService.class);
// Call<MovieEntity> call = movieService.getTopMovie(0, 10);
// call.enqueue(new Callback<MovieEntity>() {
// @Override
// public void onResponse(Call<MovieEntity> call, Response<MovieEntity> response) {
// tvShow.setText(response.body().getTitle());
// }
//
// @Override
// public void onFailure(Call<MovieEntity> call, Throwable t) {
// tvShow.setText(t.getMessage());
// }
// });
//第二种
// String baseUrl = "https://api.douban.com/v2/movie/";
//
// Retrofit retrofit = new Retrofit.Builder()
// .baseUrl(baseUrl)
// .addConverterFactory(GsonConverterFactory.create())
// .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
// .build();
// MovieService movieService = retrofit.create(MovieService.class);
//
// movieService.getTopMovie(0, 10)
// .subscribeOn(Schedulers.io())
// .observeOn(AndroidSchedulers.mainThread())
// .subscribe(new Subscriber<MovieEntity>() {
// @Override
// public void onCompleted() {
// Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
// }
//
// @Override
// public void onError(Throwable e) {
// tvShow.setText(e.getMessage());
// }
//
// @Override
// public void onNext(MovieEntity movieEntity) {
// tvShow.setText(movieEntity.getTitle());
// }
// });
HttpMethods.getInstance().getTopMovie(0, 10, new Subscriber<MovieEntity>() {
@Override
public void onCompleted() {
Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(Throwable e) {
tvShow.setText(e.getMessage());
}
@Override
public void onNext(MovieEntity movieEntity) {
tvShow.setText(movieEntity.getTitle());
}
});
}
}
但是现在存在一个问题，当存在相同格式的数据时候 我们应该怎么封装，一般来说我们后台返给我们的数据是这样的：
{
"resultCode": 0,
"resultMessage": "成功",
"data": {}
}
主要的数据是data，然后通过code来判断是否请求成功 由于data里面的数据是多变的 可以是一个对象也可以是一个数组 这时候我们需要创建一个HttpResult
package com.qianmo.retrofitdemo.http;
/**
* Created by Administrator on 2016/11/3 0003.
*/
public class HttpResult<T> {
private int resultCode ;
private String resultMessage ;
private T data ;
}
用过我们这次借口的同学都知道我们这次接口其实不是这样的，先来看看我们这次的数据结构吧
{
"count": 10,
"start": 0,
"total": 250,
"subjects": [],
"title": "豆瓣电影Top250"
}
我们打算通过count的数量来判断请求是否成功，所以吧HttpResult类修改成下面
package com.qianmo.retrofitdemo.http;
/**
* Created by Administrator on 2016/11/3 0003.
*/
public class HttpResult<T> {
// 常用形式
// private int resultCode ;
// private String resultMessage ;
//
// private T data ;
//本次接口的数据结构
private int count;
private int start;
private int total;
private String title;
//用来模仿Data
private T subjects;
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public int getStart() {
return start;
}
public void setStart(int start) {
this.start = start;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public T getSubjects() {
return subjects;
}
public void setSubjects(T subjects) {
this.subjects = subjects;
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("title=" + title + " count=" + count + " start=" + start);
if (null != subjects) {
sb.append(" subjects:" + subjects.toString());
}
return sb.toString();
}
}
在正常服务器返回的数据下code=200或者code=0的时候是表示成功的，但是由于我们这次的接口没有这一块的内容，所以打算使用count字段来判断，当coun = 0的时候表示没有数据，请求失败，所以这里我们需要在HttpMethod类中添加一个判断的方法
/**
* 用来处理请求的code
* @param <T>
*/
private class HttpResultFunc<T> implements Func1<HttpResult<T>, T> {
@Override
public T call(HttpResult<T> tHttpResult) {
if (tHttpResult.getCount() == 0) {
throw new ApiException(100);
}
return tHttpResult.getSubjects();
}
}
所以getMovie() 方法修改成了
/**
* 用于获取豆瓣电影Top250的数据
* @param subscriber 由调用者传过来的观察者对象
* @param start 起始位置
* @param count 获取长度
*/
public void getTopMovie(Subscriber<List<Subject>> subscriber, int start, int count){
movieService.getTopMovie(start, count)
.map(new HttpResultFunc<List<Subject>>())
.subscribeOn(Schedulers.io())
.unsubscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(subscriber);
}
ok，在修改一下activity中的调用方法
HttpMethods.getInstance().getTopMovie(0, 10, new Subscriber<List<Subject>>() {
@Override
public void onCompleted() {
Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(Throwable e) {
tvShow.setText(e.getMessage());
}
@Override
public void onNext(List<Subject> subjects) {
StringBuffer sb = new StringBuffer();
for (Subject subject : subjects) {
sb.append(subject.toString());
}
tvShow.setText(sb);
}
});
让我们看一下效果：（截取的动态图又太大了！！上传不了）
但是这也不是我们想要的最终结果，在请求数据的时候显示加载框，在请求完成的时候或者请求出错的时候影藏掉加载框，这样的话才算一个正常的网络请求框架。由于使用了RxJava，所以要创建一个类，继承与Subscriber，由于Subscriver对象中有四个方法，onStart、onNext、onError、onCompleted方法，我们需要在onStart中显示进度框，在onCompleted和onError中隐藏掉加载框，由于activity只关心最后的数据，所以我们需要写一个接口回调，将onNext方法中的数据传递给activity，让activity去处理逻辑。
SubscriberOnNextListenter.java
package com.qianmo.retrofitdemo.http;
/**
* Created by Administrator on 2016/11/3 0003.
*/
public interface SubscriberOnNextListenter<T> {
void next(T t);
}
ProgressSubscriber.java
package com.qianmo.retrofitdemo.http;
import android.content.Context;
import android.widget.Toast;
import rx.Subscriber;
/**
* Created by wangjitao on 2016/11/3 0003.
*/
public class ProgressSubscriber<T> extends Subscriber<T> {
private SubscriberOnNextListenter mSubscriberOnNextListenter;
private Context context;
public ProgressSubscriber(SubscriberOnNextListenter mSubscriberOnNextListenter, Context context) {
this.mSubscriberOnNextListenter = mSubscriberOnNextListenter;
this.context = context;
}
@Override
public void onStart() {
}
@Override
public void onCompleted() {
Toast.makeText(context, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(Throwable e) {
Toast.makeText(context, "error:" + e.getMessage(), Toast.LENGTH_SHORT).show();
}
@Override
public void onNext(T t) {
mSubscriberOnNextListenter.next(t);
}
}
再来修改一下我们activity调用的代码
package com.qianmo.retrofitdemo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.qianmo.retrofitdemo.entry.Subject;
import com.qianmo.retrofitdemo.http.HttpMethods;
import com.qianmo.retrofitdemo.http.ProgressSubscriber;
import com.qianmo.retrofitdemo.http.SubscriberOnNextListenter;
import java.util.List;
import butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;
import rx.Subscriber;
public class MainActivity extends AppCompatActivity {
@Bind(R.id.tv_show)
TextView tvShow;
@Bind(R.id.btn_request)
Button btnRequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
}
@OnClick({R.id.btn_request})
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_request:
getMovie();
break;
}
}
//请求网络数据
private void getMovie() {
// //https://api.douban.com/v2/movie/top250?start=0&count=10 目标地址
// String baseUrl = "https://api.douban.com/v2/movie/";
//
// //创建Retrofit对象
// Retrofit retrofit = new Retrofit.Builder()
// .baseUrl(baseUrl)
// .addConverterFactory(GsonConverterFactory.create())
// .build();
//
// MovieService movieService = retrofit.create(MovieService.class);
// Call<MovieEntity> call = movieService.getTopMovie(0, 10);
// call.enqueue(new Callback<MovieEntity>() {
// @Override
// public void onResponse(Call<MovieEntity> call, Response<MovieEntity> response) {
// tvShow.setText(response.body().getTitle());
// }
//
// @Override
// public void onFailure(Call<MovieEntity> call, Throwable t) {
// tvShow.setText(t.getMessage());
// }
// });
//第二种
// String baseUrl = "https://api.douban.com/v2/movie/";
//
// Retrofit retrofit = new Retrofit.Builder()
// .baseUrl(baseUrl)
// .addConverterFactory(GsonConverterFactory.create())
// .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
// .build();
// MovieService movieService = retrofit.create(MovieService.class);
//
// movieService.getTopMovie(0, 10)
// .subscribeOn(Schedulers.io())
// .observeOn(AndroidSchedulers.mainThread())
// .subscribe(new Subscriber<MovieEntity>() {
// @Override
// public void onCompleted() {
// Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
// }
//
// @Override
// public void onError(Throwable e) {
// tvShow.setText(e.getMessage());
// }
//
// @Override
// public void onNext(MovieEntity movieEntity) {
// tvShow.setText(movieEntity.getTitle());
// }
// });
//第三种
// HttpMethods.getInstance().getTopMovie(0, 10, new Subscriber<List<Subject>>() {
// @Override
// public void onCompleted() {
// Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
// }
//
// @Override
// public void onError(Throwable e) {
// tvShow.setText(e.getMessage());
// }
//
// @Override
// public void onNext(List<Subject> subjects) {
// StringBuffer sb = new StringBuffer();
// for (Subject subject : subjects) {
// sb.append(subject.toString());
// }
// tvShow.setText(sb);
// }
// });
SubscriberOnNextListenter subscriberOnNextListenter = new SubscriberOnNextListenter() {
@Override
public void next(Object o) {
}
};
//第四种
HttpMethods.getInstance()
.getTopMovie(0, 10, new ProgressSubscriber<List<Subject>>(
new SubscriberOnNextListenter<List<Subject>>() {
@Override
public void next(List<Subject> subjects) {
StringBuffer sb = new StringBuffer();
for (Subject subject : subjects) {
sb.append(subject.toString());
}
tvShow.setText(sb);
}
}, MainActivity.this));
}
}
再加上取消加载的接口和封装的progress就基本上完成了
package com.qianmo.retrofitdemo.http;
public interface ProgressCancelListener {
void onCancelProgress();
}
package com.qianmo.retrofitdemo.http;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Handler;
import android.os.Message;
/**
* Created by liukun on 16/3/10.
*/
public class ProgressDialogHandler extends Handler {
public static final int SHOW_PROGRESS_DIALOG = 1;
public static final int DISMISS_PROGRESS_DIALOG = 2;
private ProgressDialog pd;
private Context context;
private boolean cancelable;
private ProgressCancelListener mProgressCancelListener;
public ProgressDialogHandler(Context context, ProgressCancelListener mProgressCancelListener,
boolean cancelable) {
super();
this.context = context;
this.mProgressCancelListener = mProgressCancelListener;
this.cancelable = cancelable;
}
private void initProgressDialog(){
if (pd == null) {
pd = new ProgressDialog(context);
pd.setCancelable(cancelable);
if (cancelable) {
pd.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialogInterface) {
mProgressCancelListener.onCancelProgress();
}
});
}
if (!pd.isShowing()) {
pd.show();
}
}
}
private void dismissProgressDialog(){
if (pd != null) {
pd.dismiss();
pd = null;
}
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_PROGRESS_DIALOG:
initProgressDialog();
break;
case DISMISS_PROGRESS_DIALOG:
dismissProgressDialog();
break;
}
}
}
progressSubscriber.java
package com.qianmo.retrofitdemo.http;
import android.content.Context;
import android.widget.Toast;
import java.net.ConnectException;
import java.net.SocketTimeoutException;
import rx.Subscriber;
/**
* Created by wangjitao on 2016/11/3 0003.
*/
public class ProgressSubscriber<T> extends Subscriber<T> implements ProgressCancelListener {
private SubscriberOnNextListenter mSubscriberOnNextListenter;
private ProgressDialogHandler mProgressDialogHandler;
private Context context;
public ProgressSubscriber(SubscriberOnNextListenter mSubscriberOnNextListenter, Context context) {
this.mSubscriberOnNextListenter = mSubscriberOnNextListenter;
this.context = context;
mProgressDialogHandler = new ProgressDialogHandler(context, this, true);
}
/**
* 在开始订阅的时候显示加载框
*/
@Override
public void onStart() {
if (mProgressDialogHandler != null) {
mProgressDialogHandler.obtainMessage(ProgressDialogHandler.SHOW_PROGRESS_DIALOG).sendToTarget();
}
}
/**
* 在完成的时候进行影藏
*/
@Override
public void onCompleted() {
Toast.makeText(context, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
dismissProgressDialog();
}
/**
* 在出错的时候也进行影藏
*
* @param e
*/
@Override
public void onError(Throwable e) {
if (e instanceof SocketTimeoutException) {
Toast.makeText(context, "网络中断，请检查您的网络状态", Toast.LENGTH_SHORT).show();
} else if (e instanceof ConnectException) {
Toast.makeText(context, "网络中断，请检查您的网络状态", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(context, "error:" + e.getMessage(), Toast.LENGTH_SHORT).show();
}
dismissProgressDialog();
}
@Override
public void onNext(T t) {
mSubscriberOnNextListenter.next(t);
}
@Override
public void onCancelProgress() {
if (!this.isUnsubscribed()) {
this.unsubscribe();
}
}
private void showProgressDialog() {
if (mProgressDialogHandler != null) {
mProgressDialogHandler.obtainMessage(ProgressDialogHandler.SHOW_PROGRESS_DIALOG).sendToTarget();
}
}
private void dismissProgressDialog() {
if (mProgressDialogHandler != null) {
mProgressDialogHandler.obtainMessage(ProgressDialogHandler.DISMISS_PROGRESS_DIALOG).sendToTarget();
mProgressDialogHandler = null;
}
}
}
最后看一下效果
