Question

当我尝试在SharedPreferences中保存数据时出现问题。为什么我不能正常将数据保存到SharedPreferences中？我已经尝试过几次，但只有SharedPreferences在另一个类中工作。我也知道我做不到this。

GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(),
        new GraphRequest.GraphJSONObjectCallback() {

        @Override
        public void onCompleted(JSONObject object, GraphResponse response) {
        Log.v("LoginActivity", response.toString());

        // TODO Auto-generated method stub
        try {
            System.out.println("object :  " + object.toString());

            String id = object.getString("id");
            System.out.println("id" + id);
            String name = object.getString("name");
            System.out.println("name" + name);
            String email = object.getString("email");
            System.out.println("email" + email);
            String gender = object.getString("gender");
            System.out.println("gender" + gender);
            String birthday = object.getString("birthday");
            System.out.println("birthday" + birthday);
            JSONObject json_data = ((JSONObject) object).getJSONObject("picture").getJSONObject("data");
            String fb_picture_url = json_data.getString("url");
            URL FBPictureURL = new URL(fb_picture_url);
            System.out.println("profile picture uri" + fb_picture_url);

            SharedPreferences abc = getSharedPreferences("FBProfile",0);
            SharedPreferences.Editor editor = abc.edit();
            editor.putString(PreferenceSettings.fb_id, id);
            editor.putString(PreferenceSettings.fb_name, name);
            editor.putString(PreferenceSettings.fb_email,  email);
            editor.putString(PreferenceSettings.fb_gender,  gender);
            editor.putString(PreferenceSettings.fb_birthday,  birthday);
            editor.putString(PreferenceSettings.fb_picture_url, fb_picture_url);
            editor.commit();
            System.out.println("name" + PreferenceSettings.fb_id);
            System.out.println("name" + PreferenceSettings.fb_name);
            System.out.println("name" + PreferenceSettings.FacebookState);

这里是PreferenceSettings的字符串格式，SharedPreferences没有保存。

public static String fb_id="",
                    fb_name="",
                    fb_gender="",
                    fb_birthday="",
                    fb_email="",
                    fb_picture_url="";

保存后记录没有变化..

07-31 07:20:56.681    9303-9303/? I/System.out﹕ name My Name
07-31 07:20:56.711    9303-9303/? I/System.out﹕ name
07-31 07:20:56.711    9303-9303/? I/System.out﹕ name
07-31 07:20:56.711    9303-9303/? I/System.out﹕ nameMailauthorizing

Answer 1

将您的代码放入onSuccess方法中。因此，您可以获取用户数据因为如果用户未成功登录，则无法从响应中获得任何服务。

尝试使用SDK 4的代码。它已成功运行。我刚刚在你应该开始编写代码的地方做了评论。

＆＃13;

loginButton = (LoginButton) findViewById(R.id.login_button);

List < String > permissionNeeds = Arrays.asList("user_photos", "email",
	"user_birthday", "public_profile", "AccessToken");
loginButton.registerCallback(callbackManager,
new FacebookCallback < LoginResult > () {@Override
	public void onSuccess(LoginResult loginResult) {

		System.out.println("onSuccess");

		String accessToken = loginResult.getAccessToken()
			.getToken();
		Log.i("accessToken", accessToken);

		GraphRequest request = GraphRequest.newMeRequest(
		loginResult.getAccessToken(),
		new GraphRequest.GraphJSONObjectCallback() {@Override
			public void onCompleted(JSONObject object,
			GraphResponse response) {
				Log.i("LoginActivity", response.toString());
				try {
					id = object.getString("id");
					try {
						URL profile_pic = new URL(
							"http://graph.facebook.com/" + id + "/picture?type=large");
						Log.i("profile_pic",
						profile_pic + "");

					} catch (MalformedURLException e) {
						e.printStackTrace();
					}
					name = object.getString("name");
					email = object.getString("email");
					gender = object.getString("gender");
					birthday = object.getString("birthday");

					// your SharedPreferences code starts from here.

					SharedPreferences sharedpreferences = getSharedPreferences("myprf",Context.MODE_PRIVATE);
					Editor editor = sharedpreferences.edit();
					editor.putBoolean("login", true);
					editor.putString("name", name);
					editor.putString("email", email);
					editor.putString("gender", gender);
					editor.putString("birthday",birthday);
					editor.commit();

					Log.i("name", sharedpreferences.getString("name", ""));
					Log.i("email", sharedpreferences.getString("email", ""));
					Log.i("gender", sharedpreferences.getString("gender", ""));
					Log.i("birthday", sharedpreferences.getString("birthday", ""));

					// your SharedPreferences code ends here.

				} catch (JSONException e) {

					e.printStackTrace();
				}
			}
		});
		Bundle parameters = new Bundle();
		parameters.putString("fields",
			"id,name,email,gender, birthday");
		request.setParameters(parameters);
		request.executeAsync();
	}

	@Override
	public void onCancel() {
		System.out.println("onCancel");
	}

	@Override
	public void onError(FacebookException exception) {
		System.out.println("onError");
		Log.v("LoginActivity", exception.getCause().toString());
	}
});

＆＃13;

Answer 2

您可以使用此方法保存价值：

 public void savePreferencesForReasonCode(Context context,
String key, String value) {
SharedPreferences sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(key, value);
editor.commit();
}

使用此方法，您可以从SharedPreferences获取价值：

public String getPreferences(Context context, String prefKey) {
SharedPreferences sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(context);
return sharedPreferences.getString(prefKey, "");
}

此处prefKey是您用于保存特定值的键。感谢。

SharedPreferences无法保存数据

2 个答案: