Question

我有一个应用程序，它使用FCM发送和接收消息。我已经按照文档中的建议实施了所有操作。

现在，在生成令牌时，我想将其保存到共享首选项中。但这给了错误。

考虑类的名称就像

public class MyFirebaseMsgAndTokenService extends FirebaseMessagingService {

private static final String TAG = "C_MyFirebaseIIDService";

@Override
public void onNewToken(String newToken) {
    super.onNewToken(newToken);
    Log.d(TAG, "Refreshed token: " + newToken);
    CustomSharedPreferences customSharedPreferences = new CustomSharedPreferences(this); // giving error on this
    String oldToken = customSharedPreferences.getStringData(FCM_GENERATED_TOKEN);
    sendRegistrationToServer(newToken,oldToken);
}

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);
    Log.d(TAG, "From: " + remoteMessage.getFrom());

    try {

    } catch (Exception e) {

    }
}}

我真的很想在此服务中将令牌保存到我的应用程序中。请告诉我为什么我无法获得参考/上下文？

更新：我的CustomSharedPrefernces是一个将数据保存到sharedPrefernces中的类

public class CustomSharedPreferences {

public static final String FCM_GENERATED_TOKEN = "FCM_GENERATED_TOKEN";


private static CustomSharedPreferences mCustomSharedPreferences;
private final SharedPreferences sharedPreferences;

public static CustomSharedPreferences getInstance(Context context) {
    if (mCustomSharedPreferences == null) {
        mCustomSharedPreferences = new CustomSharedPreferences(context);
    }
    return mCustomSharedPreferences;
}


public CustomSharedPreferences(Context context) {
    sharedPreferences = context.getSharedPreferences("myApp", Context.MODE_PRIVATE);
}}

更新：

错误：“ CustomSharedPreferences中的android.content.context无法应用于com.myprojectname.MyFireBaseMsgAndTokenService”

Answer 1

您可以在此处查看我的Firebase通知处理：

public UserPreferences(Context context) {
        this.context = context;
        preferences = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
    }

您可以简单地使用this或getApplicationContext()来获取上下文

Answer 2

对我来说，我刚刚将Firebase Messaging升级到了最新版本（在撰写本文的这段时间是20.2.0）。

implementation 'com.google.firebase:firebase-messaging:20.2.0'

然后我突然又可以通过this。

Answer 3

添加以下代码，这是您的CustomSharedPreferences类。

    @Override
public void onNewToken(String s) {
    super.onNewToken(s);

    @SuppressLint("HardwareIds")
    String deviceId = Settings.Secure.getString(getContentResolver(), Settings.Secure.ANDROID_ID);

    Log.d("DEVICE_ID: " , deviceId);
    Log.d("FCM_TOKEN",s);

    SharedHelper.putKey(this, "device_token", s);
    SharedHelper.putKey(this, "device_id", deviceId);
}

之后，在FirebaseMessagingService.class中添加以下代码

$.fn.WBslider = function() {
    return this.each(function() {
        var $_this = $(this),
            $_date = $('input', $_this),
            $_title = $('.setyear', $_this),
            thumbwidth = 85, // set this to the pixel width of the thumb
            yrnow = 200;


        $_date.on('input change keyup', function() {
            var $_this = $(this),
                val = parseInt($_date.val(), 10);

            if (val < 70) {
                val = '< 70';
            }
            if (val === '') { // Stop IE8 displaying NaN
                val = 0;
            }

            $_title.text(val);

            var pos = (val - $_date.attr('min')) / ($_date.attr('max') - $_date.attr('min'));

            // position the title with the thumb
            var thumbCorrect = thumbwidth * (pos - 0.5) * -1,
                titlepos = Math.round((pos * $_date.width()) - thumbwidth / 4 + thumbCorrect);

            if ($("#date1").attr("style") != undefined) {
                titlepos = 23 + parseFloat($("#date1").attr("style").split(" ").pop().split("%")[0]);
            } else {
                titlepos = 70;
            }
            $_title.css({
                'left': titlepos
            });

            // show "progress" on the track
            pos = Math.round(pos * 99); // to hide stuff behide the thumb
            var grad = 'linear-gradient(90deg, #fb824f ' + pos + '%,#e2e5ec ' + (pos + 1) + '%)';
            $_date.css({
                'background': grad
            });

        }).on('focus', function() {
            if (isNaN($(this).val())) {
                $(this).val(0);
            }
        }).trigger('change');

        $(window).on('resize', function() {
            $_date.trigger('change');
        });
    });
};

$(function() {

    $('.slider').WBslider();

});

不要在FirebaseMessagingService类中初始化您的CustomSharedPreferences，这可能会对您有所帮助。

Answer 4

FirebaseMessagingService extends Service

和

Service extends ContextWrapper

和

ContextWrapper extends Context

所以它也是Context，所以请使用MyFirebaseMessagingService.this或简单地使用this。

如何在FirebaseMessagingService中获取上下文？

4 个答案: