Android MVP空对象引用
我正在尝试MvP模式,并在模型部分分离firebase查询。当我在presenter上调用它时,会得到null对象引用异常 型号:Android MVP空对象引用,android,firebase,firebase-authentication,android-mvp,Android,Firebase,Firebase Authentication,Android Mvp,我正在尝试MvP模式,并在模型部分分离firebase查询。当我在presenter上调用它时,会得到null对象引用异常 型号: public class LoginModelz implements LoginContract.LoginModelz { private LoginPresenter loginPresenter; FirebaseAuth mAuth; //= FirebaseAuth.getInstance(); FirebaseUser cu
public class LoginModelz implements LoginContract.LoginModelz {
private LoginPresenter loginPresenter;
FirebaseAuth mAuth; //= FirebaseAuth.getInstance();
FirebaseUser currentuser;// = mAuth.getCurrentUser();
public LoginModelz(LoginPresenter loginPresenter) {
this.loginPresenter = loginPresenter;
}
public void FirebaseQuery(){
mAuth = FirebaseAuth.getInstance();
currentuser = mAuth.getCurrentUser();
}
}
演示者:
public class LoginPresenter implements LoginContract.LoginPresenter {
private LoginView loginView;
private LoginModelz loginModelz;
public LoginPresenter(LoginView loginView) {
this.loginView = loginView;
}
public LoginPresenter(LoginModelz loginModelz) {
this.loginModelz = loginModelz;
}
@Override
public void OnLogin(String email, String password,final Context context) {
loginModelz.FirebaseQuery();
Log.e("asda",context.toString());
if(email.isEmpty() && password.isEmpty()){
loginView.OnLoginFail("Email and Password is empty");
return;
}
else if(email.isEmpty()){
loginView.OnLoginFail("Email is empty");
return;
}else if(password.isEmpty()){
loginView.OnLoginFail("Password is empty");
return;
}else {
loginView.ProgressShow("ASDASDASDASDSAd");
Log.e("emailpass", email+password);
**loginModelz.mAuth.signInWithEmailAndPassword(email,password)**
.addOnCompleteListener( new OnCompleteListener<AuthResult>()
这看起来很可疑:
public LoginPresenter(LoginView loginView) {
this.loginView = loginView;
}
public LoginPresenter(LoginModelz loginModelz) {
this.loginModelz = loginModelz;
}
你必须决定你的构造函数,如果你调用第一个你没有模型的构造函数等等
您可以在第一个构造函数中创建模型,并将其作为参数传递:
public LoginPresenter(LoginView loginView) {
this.loginView = loginView;
this.loginModel = new LoginModel(this);
}
至少从您提供的代码中可以看出这一点。您尚未初始化loginModelz。 更改演示者构造函数实现
public LoginPresenter(LoginView loginView) {
this.loginView = loginView;
this.loginModelz = new LoginModelz(this);
}
在连接3的位置显示您的代码layers@BrianHoang已对其进行编辑sirIt在我将firebase传输到模型部件时总是获取空对象引用感谢这是问题之一,并且我更改了模型,从开始时给firebase变量值
FirebaseAuth mAuth=FirebaseAuth.getInstance();FirebaseUser currentuser=mAuth.getCurrentUser()代码>因此,如果这是公认的答案,那么最好这样做。谢谢
public LoginPresenter(LoginView loginView) {
this.loginView = loginView;
this.loginModelz = new LoginModelz(this);
}