java - 单独类中的 OkHttp 请求

Question

所以我目前在 MainActivity 中有 OkHttp 请求，以测试它们是否确实有效。但是，我需要将它们移动到一个单独的类，以便我可以使用请求来填充我的抽屉导航菜单项。此外，在我的 MainActivity 中，我执行 oAuth 来使 token 无效并请求它，并且该 token 需要在我的请求中使用。当我在 MainActivity 中调用新类时，我有点迷失了 apiRequest.run(); 这是我在运行控制台中得到的结果。

I/System.out: ya29.CjBIAx67rM70-CKu9Wc5fUSLzt9rIqt4bRubpl4hB9UjwqeRatoZppbMmNDl_SPcFWA
E/AuthApp: ya29.CjBIAx67rM70-CKu9Wc5fUSLzt9rIqt4bRubpl4hB9UjwqeRatoZppbMmNDl_SPcFWA
W/System.err: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String android.content.SharedPreferences.getString(java.lang.String, java.lang.String)' on a null object reference
W/System.err:     at com.example.jamessingleton.chffrapi.AuthPreferences.getToken(AuthPreferences.java:43)
W/System.err:     at com.example.jamessingleton.chffrapi.APIRequests.run(APIRequests.java:34)
W/System.err:     at com.example.jamessingleton.chffrapi.MainActivity$1.onClick(MainActivity.java:90)
W/System.err:     at com.google.android.gms.common.SignInButton.onClick(Unknown Source)
W/System.err:     at android.view.View.performClick(View.java:5697)
W/System.err:     at android.widget.TextView.performClick(TextView.java:10814)
W/System.err:     at android.view.View$PerformClick.run(View.java:22526)
W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
W/System.err:     at android.os.Looper.loop(Looper.java:158)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7224)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

这是我正在实现它的 MainActivity。

Context mContext = MainActivity.this;
    private AccountManager mAccountManager;
    private AuthPreferences authPreferences;
    private APIRequests apiRequests;
    EditText emailText;
    TextView responseView;
    ProgressBar progressBar;

    static final String API_URL = "https://api.comma.ai/v1/auth/?access_token=";
    static final String ChffrMe_URL = "https://api.comma.ai/v1/me/";
    static final String SCOPE = "https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/plus.me";
    private static final int AUTHORIZATION_CODE = 1993;
    private static final int ACCOUNT_CODE = 1601;
    String commatoken;
    String commaMyInfo;
    private final OkHttpClient client = new OkHttpClient();



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        responseView = (TextView) findViewById(R.id.responseView);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
        mAccountManager = AccountManager.get(this);
        authPreferences = new AuthPreferences(this);
        apiRequests = new APIRequests();
        final Context context = this;
        invalidateToken();
        requestToken();
        SignInButton signInButton = (SignInButton) findViewById(R.id.sign_in_button);
        signInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (authPreferences.getUser() != null && authPreferences.getToken() != null) {
                    System.out.println(authPreferences.getToken());
                    doCoolAuthenticatedStuff();
//                    Intent intent = new Intent(context, NavDrawerActivity.class);
//                    startActivity(intent);
                    try {
                        apiRequests.run();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
//                    try {
//                        run();
//                    } catch (Exception e) {
//                        e.printStackTrace();
//                    }
                    //new RetrieveFeedTask().execute();
                } else {
                    chooseAccount();
                }
            }
        });

这是我的 APIRequests.java

public class APIRequests {
    private final OkHttpClient client = new OkHttpClient();
    static final String API_URL = "https://api.comma.ai/v1/auth/?access_token=";
    static final String ChffrMe_URL = "https://api.comma.ai/v1/me/";
    private AuthPreferences authPreferences = new AuthPreferences(this);
    String commatoken;
    String commaMyInfo;
    private MainActivity mActivity;

    public void run() throws Exception {
        Request request = new Request.Builder()
                .url(API_URL + authPreferences.getToken())
                .build();

        client.newCall(request).enqueue(new Callback() {
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
            }


            public void onResponse(Call call, Response response) throws IOException {
                if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

                Headers responseHeaders = response.headers();
                for (int i = 0, size = responseHeaders.size(); i < size; i++) {
                    System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
                }
                try
                {
                    String token = response.body().string();
                    JSONObject json = new JSONObject(token);
                    commatoken = json.getString("access_token");
                } catch (JSONException e)
                {

                }
//                commatoken = response.body().string();
//                System.out.println(commatoken);

                if(response.isSuccessful())
                {
                    final Request dataRequest = new Request.Builder()
                            .header("content-type", "application/x-www-form-urlencoded")
                            .header("authorization", "JWT "+ commatoken)
                            .url(ChffrMe_URL).build();

                    client.newCall(dataRequest).enqueue(new Callback() {
                        @Override
                        public void onFailure(Call call, IOException e) {
                            e.printStackTrace();
                        }

                        @Override
                        public void onResponse(Call call, Response responseMe) throws IOException {
                            if (!responseMe.isSuccessful()) throw new IOException("Unexpected code " + responseMe);

                            Headers responseHeaders = responseMe.headers();
                            for (int i = 0, size = responseHeaders.size(); i < size; i++) {
                                System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
                            }
                            try
                            {
                                String myInfo = responseMe.body().string();
                                JSONObject json = new JSONObject(myInfo);
                                commaMyInfo = json.getString("points");
                                System.out.println(commaMyInfo);
                            } catch (JSONException e)
                            {

                            }
//                            runOnUiThread(new Runnable() {
//                                @Override
//                                public void run() {
//                                    responseView.setText("Comma Points: " +commaMyInfo);
//                                }
//                            });

                        }
                    });
                }
            }

        });
    }
}

不知道为什么它不喜欢我的 apiRequests.run();

这是 AuthPreferences

public class AuthPreferences {
    private static final String KEY_USER = "user";
    private static final String KEY_TOKEN = "token";

    private SharedPreferences preferences;

    public AuthPreferences(Context context) {
        preferences = context
                .getSharedPreferences("auth", Context.MODE_PRIVATE);
    }

    public AuthPreferences(APIRequests apiRequests) {

    }

    public void setUser(String user) {
        Editor editor = preferences.edit();
        editor.putString(KEY_USER, user);
        editor.commit();
    }

    public void setToken(String password) {
        Editor editor = preferences.edit();
        editor.putString(KEY_TOKEN, password);
        editor.commit();
    }

    public String getUser() {
        return preferences.getString(KEY_USER, null);
    }

    public String getToken() {
        return preferences.getString(KEY_TOKEN, null);

    }
}

Answer 1

您的 AuthPreferences 类有两个构造函数。设置一个首选项字段。另一个则不然。当您使用未设置 preferences 字段的构造函数时，您会崩溃，因为当您尝试使用它时，该字段为 null。

我建议摆脱第二个构造函数。然后，将一个构造函数添加到以 AuthPreferences 作为参数的 APIRequests 中，并使用它来填充 authPreferences 字段(而不是创建一个新的，有缺陷的 AuthPreferences 实例)。然后，在 Activity 中，将 apiRequests = new APIRequests(); 替换为 apiRequests = new APIRequests(authPreferences);，以满足新构造函数的要求。