最近研究了一下Retrofit,也动手写了一些代码,今天整理一下,方便以后的学习
先看一张效果图
因为需要图片,我们先来看看adapter的写法
1.BasicAdapter
public abstract class BasicAdapter<T> extends BaseAdapter {
private Context mContext;
private List<T> mDatas;
private LayoutInflater mInflater;
private int mItemLayoutId;
public BasicAdapter(Context context, List<T> mDatas, int itemLayoutId) {
this.mContext = context;
this.mDatas = mDatas;
this.mItemLayoutId = itemLayoutId;
mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return mDatas.size();
}
@Override
public T getItem(int position) {
return mDatas.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
BasicViewHolder viewHolder = getViewHolder(position, convertView, parent);
convert(viewHolder,getItem(position));
return viewHolder.getConvertView();
}
public abstract void convert(BasicViewHolder helper,T item);
private BasicViewHolder getViewHolder(int position,View convertView,ViewGroup parent){
return BasicViewHolder.get(mContext,convertView,parent,mItemLayoutId,position);
}
}
2.BasicViewHolder
public class BasicViewHolder {
private View mConvertView;
private int mPosition;
private SparseArray<View> mViews;
private BasicViewHolder(Context context, ViewGroup parent,int layoutId,int position){
mConvertView = LayoutInflater.from(context).inflate(layoutId,parent,false);
this.mPosition = position;
mViews = new SparseArray<View>();
mConvertView.setTag(this);
}
public static BasicViewHolder get(Context context,View convertView,ViewGroup parent,int layoutId,int position){
if(convertView == null){
return new BasicViewHolder(context,parent,layoutId,position);
}else{
return (BasicViewHolder) convertView.getTag();
}
}
public View getConvertView(){
return mConvertView;
}
public <T extends View> T getView(int viewId){
View view = mViews.get(viewId);
if(view == null){
view = mConvertView.findViewById(viewId);
mViews.put(viewId,view);
}
return (T)view;
}
public BasicViewHolder setText(int viewId,String text){
TextView textView = getView(viewId);
textView.setText(text);
return this;
}
public BasicViewHolder setImageResource(int viewId,int resId){
ImageView imageView = getView(viewId);
imageView.setImageResource(resId);
return this;
}
public BasicViewHolder setImageBitmap(int viewId, Bitmap bm) {
ImageView view = getView(viewId);
view.setImageBitmap(bm);
return this;
}
public void setImageUri(int viewId,String url){
ImageView imageView = getView(viewId);
Uri uri = Uri.parse(url);
imageView.setImageURI(uri);
}
public int getPosition() {
return mPosition;
}
}
3.MovieAdapter
public class MovieAdapter extends BasicAdapter<MovieInfo.MovieBean> {
public MovieAdapter(Context context, List<MovieInfo.MovieBean> mDatas, int itemLayoutId) {
super(context, mDatas, itemLayoutId);
}
@Override
public void convert(BasicViewHolder helper, MovieInfo.MovieBean item) {
helper.setImageUri(R.id.movie_item_view,Constant.IMAGE_URL+item.poster_path );
}
}
然后是接口地址
public interface Constant {
String API_KEY = "643e503c35816202926457ad7d535052";
String BASE_URL = "http://api.themoviedb.org/3/discover/movie/";
String POP_LIST =
"?sort_by=popularity.desc&api_key=";
String IMAGE_URL = "http://image.tmdb.org/t/p/w185";
String SCORE_LIST = "movie?sort_by=vote_average.desc&api_key=";
}
因为我们要请求天气和电影信息,所以需要两个实体类
public class MovieInfo {
public int page;
public int total_results;
public int total_pages;
public List<MovieBean> results;
public static class MovieBean {
public String poster_path;
public boolean adult;
public String overview;
public String release_date;
public int id;
public String original_title;
public String original_language;
public String title;
public String backdrop_path;
public double popularity;
public int vote_count;
public boolean video;
public double vote_average;
public List<Integer> genre_ids;
}
}
public class WeatherInfo {
public WeatherinfoBean weatherinfo;
public static class WeatherinfoBean {
public String city;
public String cityid;
public String temp;
public String WD;
public String WS;
public String SD;
public String WSE;
public String time;
public String isRadar;
public String Radar;
public String njd;
public String qy;
@Override
public String toString() {
return "WeatherinfoBean{" +
"city='" + city + '\'' +
", cityid='" + cityid + '\'' +
", temp='" + temp + '\'' +
", WD='" + WD + '\'' +
", WS='" + WS + '\'' +
", SD='" + SD + '\'' +
", WSE='" + WSE + '\'' +
", time='" + time + '\'' +
", isRadar='" + isRadar + '\'' +
", Radar='" + Radar + '\'' +
", njd='" + njd + '\'' +
", qy='" + qy + '\'' +
'}';
}
}
@Override
public String toString() {
return "WeatherInfo{" +
"weatherinfo=" + weatherinfo +
'}';
}
}
加载图片使用的是Fresco,请求网络是Retrofit
Fresco使用要先初始化
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Fresco.initialize(this);
setContentView(R.layout.activity_main);
注意要在setContentView之前。
下面给出请求部分的代码
public class RetrofitWrapper {
private final Retrofit retrofit;
private RetrofitWrapper(){
//BASE_URL必须以/结尾,否则会出异常
retrofit = new Retrofit.Builder().baseUrl(Constant.BASE_URL).addConverterFactory(GsonConverterFactory.create()).build();
}
public static RetrofitWrapper getInstance() {
return RefrofitHolder.instance;
}
/**静态内部类*/
public static class RefrofitHolder{
private static RetrofitWrapper instance = new RetrofitWrapper();
}
public <T> T create(Class<T> service){
return retrofit.create(service);
}
}
public class AppClient {
private static Retrofit mRetrofit;
public static Retrofit retrofit(){
if(mRetrofit == null){
mRetrofit = new Retrofit.Builder().baseUrl("http://www.weather.com.cn/").addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create()).build();
}
return mRetrofit;
}
}
public class RxClient {
private static Retrofit sRetrofit;
public static Retrofit retrofit(){
if(sRetrofit == null){
sRetrofit = new Retrofit.Builder().baseUrl("http://www.weather.com.cn/")
.addConverterFactory(GsonConverterFactory.create())//添加gson转换
.addCallAdapterFactory(RxJavaCallAdapterFactory.create()).build();//添加rxjava支持
}
return sRetrofit;
}
}
以上是对Retrofit的一些封装,下面我们看看请求的Service
/**
* 不带参数,拼接好的
*/
public interface MovieService {
@GET(Constant.POP_LIST+Constant.API_KEY)//拼接在BASE_URL后面的路径
Call<MovieInfo> getPopMovieList();//无参数的方法,Call<T> 中的T为结果对应的实体类,如果是字符串,可以用ResponseBody
}
public interface MovieService2 {
@GET(Constant.BASE_URL)//如果不需要在BASE_URL后面拼接其他路径,则再次写BASE_URLd的路径
//@Query 指定参数的名称 "?sort_by=popularity.desc&api_key=";
Call<ResponseBody> getMovieScoreList(@Query("sort_by")String sort_by,@Query("api_key") String api_key);
//ResponseBody 代表要获取字符串
}
public interface WeatherService {
@GET("adat/sk/{cityId}.html")//注意参数名称必须一样 @Path表示将参数进行匹配,与{}结合使用
Observable<WeatherInfo> getWeatherInfo(@Path("cityId") String cityId);
Observable<WeatherInfo> getWeatherInfo2(@Path("cityId") String cityId);
}
public interface RxWeatherService {
@GET("adat/sk/{cityId}.html")
Observable<WeatherInfo> getWeathInfoRxJava(@Path("cityId")String cityId);
}
准备工作已经做好了,看看在代码中如何使用
/**
* 请求接口数据,封装成实体类,将图片显示在列表中
*/
public class MainActivity extends AppCompatActivity {
private GridView mMovie_gridview;
private List<MovieInfo.MovieBean> mData;
private MovieAdapter mMovieAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Fresco.initialize(this);
setContentView(R.layout.activity_main);
mData = new ArrayList<>();
mMovie_gridview = (GridView) findViewById(R.id.movie_gridview);
mMovieAdapter = new MovieAdapter(this,mData,R.layout.movie_item_layout);
mMovie_gridview.setAdapter(mMovieAdapter);
MovieService movieService = RetrofitWrapper.getInstance().create(MovieService.class);
Call<MovieInfo> movieInfoCall = movieService.getPopMovieList();
movieInfoCall.enqueue(new Callback<MovieInfo>() {
@Override
public void onResponse(Call<MovieInfo> call, Response<MovieInfo> response) {
MovieInfo movieInfo = response.body();
mData.addAll(movieInfo.results);
mMovieAdapter.notifyDataSetChanged();
}
@Override
public void onFailure(Call<MovieInfo> call, Throwable t) {
Toast.makeText(MainActivity.this, t.toString(), Toast.LENGTH_SHORT).show();
}
});
}
}
/**
* 请求接口,获取结果字符串,显示在界面上
*/
public class SecondActivity extends AppCompatActivity {
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
mTextView = (TextView) findViewById(R.id.movie_content);
MovieService2 movieService2 = RetrofitWrapper.getInstance().create(MovieService2.class);
//同步调用,不能在主线程,会发生NetworkOnMainThreadException
Call<ResponseBody> responseBodyCall = movieService2.getMovieScoreList("popularity.desc",Constant.API_KEY);
// try {
// Response<ResponseBody> result = responseBodyCall.execute();
// mTextView.setText(result.body().string());
// } catch (IOException e) {
// e.printStackTrace();
// }
//异步调用
responseBodyCall.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
ResponseBody body = response.body();
try {
mTextView.setText(body.string());
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
Toast.makeText(SecondActivity.this, t.toString(), Toast.LENGTH_SHORT).show();
}
});
}
}
/**
* 请求城市信息
*/
public class ThirdActivity extends AppCompatActivity {
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
mTextView = (TextView) findViewById(R.id.tv_weather);
WeatherService weatherService = AppClient.retrofit().create(WeatherService.class);
Observable<WeatherInfo> weatherInfo = weatherService.getWeatherInfo("101010100");
weatherInfo.subscribeOn(Schedulers.io())//指定被观察者运行在IO线程,否则会在主线程操作网络
.observeOn(AndroidSchedulers.mainThread())//指定观察者运行在主线程,否则会报错
.subscribe(new Action1<WeatherInfo>() {
@Override
public void call(WeatherInfo weatherInfo) {
mTextView.setText(weatherInfo.weatherinfo.cityid);
}
});
}
}
public class FourThActivity extends AppCompatActivity {
private static final String TAG = "FourThActivity";
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_four_th);
mTextView = (TextView) findViewById(R.id.text);
RxWeatherService rxWeatherService = RxClient.retrofit().create(RxWeatherService.class);
Observable<WeatherInfo> observable = rxWeatherService.getWeathInfoRxJava("101010100");
observable.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<WeatherInfo>() {
@Override
public void onCompleted() {
Log.d(TAG, "onCompleted: ");
}
@Override
public void onError(Throwable e) {
Log.e(TAG, "onError: ",e );
}
@Override
public void onNext(WeatherInfo weatherInfo) {
mTextView.setText(weatherInfo.toString());
}
});
}
}
最后看看效果图
第一个页面的效果图已经在最开始给出了
我们看看其他的
第二个
第三个
第四个