将登录访问令牌存储到android MVVM架构中的sharedpreference中

Question

目前我正在使用实时 api，在登录 api 中我得到了一个访问令牌作为响应。因为我遵循 mvvm 模式，所以我通过存储库处理我的数据。我希望我从响应中获得的令牌将存储在sharedpreference中，稍后我将使用其他api作为标头。我不清楚如何通过存储库将该令牌存储到共享首选项中。

我的包裹：

我的存储库类：

class OpusRepoImpl private constructor() : OpusRepository {

private val mLivedata: MutableLiveData<LoginPojo> = MutableLiveData()
private var rInstance: RetrofitInstance = RetrofitInstance()

override fun cLoginResponse(
    context: Context,
    username: String,
    password: String
): MutableLiveData<LoginPojo> {

    val apiServices = rInstance.getRetrofitInstance()?.create(ApiServices::class.java)
    val requestBody = LoginBody(username, password)

    val clientId = "myclientid"
    val clientSecret =
        "myClientSecrete"
    val grantType = "password"
    val call = apiServices?.getUser(clientId, clientSecret, grantType, requestBody)

    try {
        call?.enqueue(object : Callback<LoginPojo> {
            override fun onResponse(
                call: Call<LoginPojo>,
                response: Response<LoginPojo>
            ) {
                if (!response.isSuccessful) {
                    Toast.makeText(context, "Login Failed", Toast.LENGTH_SHORT).show()
                    return
                }
                val loginResponse = response.body()
                loginResponse?.access_token

                //Here i want to save the login access token into sharedpreference

                mLivedata.postValue(loginResponse!!)
            }

            override fun onFailure(call: Call<LoginPojo>, t: Throwable) {
                Toast.makeText(context, "Login Failed", Toast.LENGTH_SHORT).show()
            }
        })
    } catch (e: Exception) {
        e.printStackTrace()
        Toast.makeText(context, "Login Failed", Toast.LENGTH_SHORT).show()
    }
    return mLivedata
}

companion object {
    private var instance: OpusRepoImpl? = null

    fun getInstance(): OpusRepoImpl {
        return instance ?: synchronized(this) {
            instance ?: OpusRepoImpl().also { instance = it }
        }
    }
}

登录片段：

class LoginFragment : Fragment(), OnClickListener {


private lateinit var binding: FragmentLoginBinding

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View {
    binding = FragmentLoginBinding.inflate(inflater, container, false)
    return binding.root
}


override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    setOnclicklistener()
}

private fun setOnclicklistener() {
    binding.btnLogin.setOnClickListener(this)
}

companion object {

    @JvmStatic
    fun newInstance() =
        LoginFragment().apply {
            arguments = Bundle().apply {

            }
        }
}

override fun onClick(v: View) {

    when (v.id) {
        R.id.btnLogin -> {
            val email = binding.edEmail.text.toString()
            val pass = binding.edPassword.text.toString()

            if (isValid()) {
                loginCheck(email, pass)
            }
        }

    }
}

private fun loginCheck(email: String, pass: String) {
    //val sharedPreferences = requireContext().getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
    val loginViewModel = ViewModelProvider(this)[LoginViewModel::class.java]

    loginViewModel.loginResponse(requireContext(), email, pass).observe(viewLifecycleOwner, Observer { loginPojo ->

        val accessToken = loginPojo.access_token
        if (accessToken.isNotEmpty()){
            Navigation.findNavController(requireView()).navigate(R.id.homepage)
        }
    })
}

private fun isValid(): Boolean {

    binding.edEmail.error = null
    binding.edPassword.error = null

    var isValid = true
    val email = binding.edEmail.toString()
    val pass = binding.edPassword.toString()

    if (email.isEmpty()) {
        isValid = false
        binding.edEmail.error = "Enter Your Email"
    } else {
        val emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+"
        if (!email.matches(emailPattern.toRegex())) {
            binding.edEmail.error = "Enter a Valid Email"
            isValid = false
        }
    }

    if (pass.isEmpty()) {
        isValid = false
        binding.edPassword.error = "Enter Your Password"
    } else {
        if (pass.length < 8) {
            binding.edPassword.error = "Your pass was at-least 8 character"
            isValid = false
        }
    }

    return isValid
}}

登录视图模型：

class LoginViewModel(val application: Application) : AndroidViewModel(application) {

private val loginRepo = OpusRepoImpl.getInstance()

fun loginResponse(
    context:Context,
    username: String,
    password: String
): MutableLiveData<LoginPojo> {
    return loginRepo.cLoginResponse(context, username, password)
}}

Answer 1

你必须添加此代码：

 //For saveing access token in shared prefrence
 val sharedPreferences = context.getSharedPreferences("MySharedPrefs", Context.MODE_PRIVATE)
 sharedPreferences.edit {
     putString("AccessToken", accesstoken)
      apply()
  }

这是完整的代码：

class OpusRepoImpl private constructor() : OpusRepository {

    private val mLivedata: MutableLiveData<LoginPojo> = MutableLiveData()
    private var rInstance: RetrofitInstance = RetrofitInstance()

    override fun cLoginResponse(
        context: Context,
        username: String,
        password: String
    ): MutableLiveData<LoginPojo> {

        val apiServices = rInstance.getRetrofitInstance()?.create(ApiServices::class.java)
        val requestBody = LoginBody(username, password)

        val clientId = "myclientid"
        val clientSecret =
            "myClientSecrete"
        val grantType = "password"
        val call = apiServices?.getUser(clientId, clientSecret, grantType, requestBody)

        try {
            call?.enqueue(object : Callback<LoginPojo> {
                override fun onResponse(
                    call: Call<LoginPojo>,
                    response: Response<LoginPojo>
                ) {
                    if (!response.isSuccessful) {
                        Toast.makeText(context, "Login Failed", Toast.LENGTH_SHORT).show()
                        return
                    }
                    val loginResponse = response.body()
                    val accesstoken = loginResponse?.access_token
                    
                    
                    //For saveing access token in shared prefrence 
                    val sharedPreferences = context.getSharedPreferences("MySharedPrefs", Context.MODE_PRIVATE)
                    sharedPreferences.edit {
                        putString("AccessToken", accesstoken)
                        apply()
                    }

                    mLivedata.postValue(loginResponse!!)
                }

                override fun onFailure(call: Call<LoginPojo>, t: Throwable) {
                    Toast.makeText(context, "Login Failed", Toast.LENGTH_SHORT).show()
                }
            })
        } catch (e: Exception) {
            e.printStackTrace()
            Toast.makeText(context, "Login Failed", Toast.LENGTH_SHORT).show()
        }
        return mLivedata
    }

    companion object {
        private var instance: OpusRepoImpl? = null

        fun getInstance(): OpusRepoImpl {
            return instance ?: synchronized(this) {
                instance ?: OpusRepoImpl().also { instance = it }
            }
        }
    }
}

为了从共享首选项获取访问令牌，您可以这样做：

val accessToken  = sharedPreferences.getString("AccessToken",null)