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中被調用，但FirebaseApp未初始化我正在創建一個Android應用程序，並且我正在嘗試使用Firebase實現用戶身份驗證。據我所知，我的應用已連接到我的Firebase服務器。儘管FirebaseApp.initializeApp（）在應用程序類
嘗試通過按鈕按鈕從SignIn活動切換到SignUp活動時遇到運行時錯誤。該應用程序崩潰，我遇到一個運行時錯誤。
據我所知，運行時錯誤來自於SignUp活動的onCreate()調用，當我嘗試使用FirebaseAuth.getInstance()初始化FirebaseAuth對象時。此調用失敗因
java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process seniordesign.phoneafriend. Make sure to call FirebaseApp.initializeApp(Context).
不過，我讓我的應用程序類的onCreate()方法，我覺得就可以了這一呼籲。我將initalizeApp()呼叫添加到SignUp的onCreate()呼叫，但沒有骰子。我已經找過這個問題的其他人，但還沒有找到類似的東西。謝謝你的幫助。
AndroidManifest.xml中
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="seniordesign.phoneafriend">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:name="seniordesign.phoneafriend.PhoneAFriend">
<activity android:name=".SignIn">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".SignUp"></activity>
</application>
</manifest>
PhoneAFriend.java（我的應用程序類）
public class PhoneAFriend extends Application {
public void onCreate(){
super.onCreate();
Firebase.setAndroidContext(this);
FirebaseApp.initializeApp(this);
}
}
SignUp.java
public class SignUp extends AppCompatActivity {
protected Firebase ref;
protected EditText emailText;
protected EditText passText;
protected EditText confirmText;
protected Button button;
protected SignUp thisContext;
protected FirebaseAuth auth;
protected FirebaseAuth.AuthStateListener authListener;
private View.OnClickListener onClickListener;
public static Intent intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
ref = new Firebase("https://phoneafriend-7fb6b.firebaseio.com");
emailText = (EditText) findViewById(R.id.signup_emailText);
passText = (EditText) findViewById(R.id.signup_passwordText);
confirmText = (EditText) findViewById(R.id.signup_passwordConfirm);
intent = new Intent(this, SignIn.class);
//Tried this already
//FirebaseApp.initializeApp(this);
auth = FirebaseAuth.getInstance();
button = (Button) findViewById(R.id.signup_button);
onClickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
createUser(view);
Log.v("SignUp Button" , "Clicked; Attempting to create user");
}
};
button.setOnClickListener(onClickListener);
authListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
// User is signed in
Log.d("FirebaseAuth", "onAuthStateChanged:signed_in:" + user.getUid());
} else {
// User is signed out
Log.d("FirebaseAuth", "onAuthStateChanged:signed_out");
}
// ...
}
};
thisContext = this;
}
@Override
public void onStart(){
super.onStart();
//auth.addAuthStateListener(authListener);
}
@Override
public void onStop(){
super.onStop();
if(authListener != null) {
//auth.removeAuthStateListener(authListener);
}
}
protected void createUser(View view){
String cString = null;
String pString = null;
String eString = emailText.getText().toString();
if(passText.getText() != null && confirmText.getText() != null) {
pString = passText.getText().toString();
cString = confirmText.getText().toString();
Log.v("SignUP: Pass Null check" , "Pass");
if (emailText.getText() != null && pString.equals(cString) && passText.getText() != null) {
Log.v("SignUP: Sign up check " , "Pass");
auth.createUserWithEmailAndPassword(emailText.getText().toString() , passText.getText().toString())
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.v("createUser complete" , "status: " + task.isSuccessful());
if(task.isSuccessful()){
startActivity(SignUp.intent);
}
}
});
}
}
return;
}
}
您正在混合來自傳統2.x.x的API調用。 SDK與新的9.x.x SDK不兼容。您應該只使用新的SDK。看到這個相關的答案：http://stackoverflow.com/a/39321686/4815718 –