RxJava学习总结4

概述：

这次带来了一个实际案例的操作，利用RxJava+OKHttp实现用户登录功能。

也是在开发中有实际作用价值的，在这里记录下。

JsonUtils.java:

public class JsonUtils {
    /**
     * @param json
     * @return
     */
	 //用来检测reusltCode是否是错误码
    public static boolean parserJson(String json) {
        boolean flag = false;
        try{
            int result = new JSONObject(json).getJSONObject("result").getInt("resultCode");
            if (result!=1){
                flag = false;
            }else{
                flag = true;
            }
        }catch(JSONException e){
           e.printStackTrace();
        }

        return flag;
    }
}

LoginUtils.java:

public class LoginUtils {

    private OkHttpClient client;

    public LoginUtils() {
        client = new OkHttpClient();
    }

    /**
     * 定义了login操作,使用RxAndroid的编程思想
     * @param url
     * @param params
     * @return
     */
    public Observable<String> login(String url,Map<String,String> params){
        return Observable.create(new Observable.OnSubscribe<String>() {
            @Override
            public void call(Subscriber<? super String> subscriber) {
               if (!subscriber.isUnsubscribed()){
                   FormBody.Builder builder = new FormBody.Builder();
                   if (params!=null&&!params.isEmpty()){
                       for(Map.Entry<String,String> entry:params.entrySet()){
                           builder.add(entry.getKey(),entry.getValue());
                       }
                   }
                   RequestBody requestBody = builder.build();
                   //构建post请求
                   Request request = new Request.Builder().url(url).post(requestBody).build();
                   client.newCall(request).enqueue(new Callback() {
                       @Override
                       public void onFailure(Call call, IOException e) {
                           subscriber.onError(e);
                       }

                       @Override
                       public void onResponse(Call call, Response response) throws IOException {
                          if (response.isSuccessful()){
                              subscriber.onNext(response.body().string());
                          }
                           subscriber.onCompleted();//访问结束
                       }
                   });
               }
            }
        });
    }
}

MainActivity.java:

public class MainActivity extends ActionBarActivity {

    private final String TAG = MainActivity.class.getSimpleName();

    private Button button;
    private EditText username;
    private EditText password;

    private ProgressDialog dialog;
    private LoginUtils utils;

    private final String LOGIN = "http://192.168.72.196:8080/webproject/LoginAction";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) this.findViewById(R.id.button);
        username = (EditText) this.findViewById(R.id.editText);
        dialog = new ProgressDialog(this);
        dialog.setTitle("login......");
        utils = new LoginUtils();
        password = (EditText) this.findViewById(R.id.editText2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
				//将参数封装成Map集合
                Map<String, String> params = new HashMap<String, String>();
                params.put("username", username.getText().toString().trim());
                params.put("password", password.getText().toString().trim());

                utils.login(LOGIN, params).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Subscriber<String>() {
                    @Override
                    public void onCompleted() {
                        dialog.dismiss();
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.i(TAG, e.getMessage());
                    }

                    @Override
                    public void onNext(String s) {
                        dialog.show();
                       // Log.i(TAG,s);
                       if (JsonUtils.parserJson(s)){
                           //Log.i(TAG,"success");
                           Intent intent = new Intent(MainActivity.this,MainScreen.class);
                           startActivity(intent);

                       }
                    }
                });
            }
        });
    }
}