我知道这个问题已经被问过很多次了，但请听我说完。我有 MainActivity，它是一个 LoginActivity，它使用 Facebook 登录和来自 Facebook 的 AccountKit 登录并开始下一个活动，它是一个 ContactsActivity。当我在 ContactsActivity 并按返回按钮时，它会将我带到 MainActivity 但我想在用户成功登录时关闭应用程序，如果用户再次打开应用程序，它应该直接打开 ContactsActivity，因为用户之前已成功登录。
问题是当我在 Contacts Activity 中按下返回按钮时，它会将我带到 LoginActivity，我已经在 startActivity（intent）之后尝试完成（），它会关闭我的应用程序，并且在成功登录后不会将我带到 ContactsActivity。如果我再次打开我的应用程序然后它将我直接带到 ContactsActivity。我什至尝试了 onBackPressed，我在其中写了完成，但它不起作用。在 Android Manifest 中，我也在 MainActivity 标签中写了 android:noHistory="true" 但它不起作用。请帮忙
活动主
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="pritish.sawant.com.simplychat.MainActivity">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/loginwithphonenumber"
android:text="@string/loginwithphoneno"
style="@style/Base.Widget.AppCompat.Button.Borderless"
android:textColor="@android:color/white"
android:background="@drawable/login_button_selector"
android:textSize="16sp"
android:layout_centerInParent="true"
android:textAlignment="center"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="8dp"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/email_login_button"
android:text="@string/loginwithemail"
android:layout_below="@+id/loginwithphonenumber"
style="@style/Base.Widget.AppCompat.Button.Borderless"
android:textColor="@android:color/white"
android:background="@drawable/login_button_selector"
android:textSize="16sp"
android:textAlignment="center"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="8dp"
/>
<com.facebook.login.widget.LoginButton
android:id="@+id/facebook_login_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/email_login_button"
android:textSize="16sp"
android:textAllCaps="true"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="16dp"
android:paddingTop="14dp"
android:paddingBottom="14dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
/>
</RelativeLayout>
主要活动
public class MainActivity extends AppCompatActivity {
public static int APP_REQUEST_CODE=1;
private LoginButton facebookloginButton;
private Button emailloginbutton,phonenologinbutton;
private CallbackManager callbackManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
facebookloginButton=(LoginButton)findViewById(R.id.facebook_login_button);
emailloginbutton=(Button)findViewById(R.id.email_login_button);
phonenologinbutton=(Button)findViewById(R.id.loginwithphonenumber);
callbackManager=CallbackManager.Factory.create();
facebookloginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
launchContactsActivity();
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException error) {
Toast.makeText(getApplicationContext(), R.string.loginfailed,Toast.LENGTH_LONG).show();
}
});
AccessToken accessToken= AccountKit.getCurrentAccessToken();
com.facebook.AccessToken loginToken= com.facebook.AccessToken.getCurrentAccessToken();
if(accessToken!=null || loginToken!=null){
launchContactsActivity();
}
emailloginbutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onLogin(LoginType.EMAIL);
}
});
phonenologinbutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onLogin(LoginType.PHONE);
}
});
}
private void launchContactsActivity(){
Intent intent=new Intent(getApplicationContext(),ContactsActivity.class);
startActivity(intent);
finish();
}
private void onLogin(final LoginType loginType) {
// create intent for the Account Kit activity
final Intent intent = new Intent(this, AccountKitActivity.class);
// configure login type and response type
AccountKitConfiguration.AccountKitConfigurationBuilder configurationBuilder =
new AccountKitConfiguration.AccountKitConfigurationBuilder(
loginType,
AccountKitActivity.ResponseType.TOKEN
);
final AccountKitConfiguration configuration = configurationBuilder.build();
// launch the Account Kit activity
intent.putExtra(AccountKitActivity.ACCOUNT_KIT_ACTIVITY_CONFIGURATION, configuration);
startActivityForResult(intent, APP_REQUEST_CODE);
finish();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode,resultCode,data);
if(requestCode==APP_REQUEST_CODE){
AccountKitLoginResult accountKitLoginResult=data.getParcelableExtra(AccountKitLoginResult.RESULT_KEY);
if(accountKitLoginResult.getError()!=null){
String toastMessage = accountKitLoginResult.getError().getErrorType().getMessage();
Toast.makeText(this, toastMessage, Toast.LENGTH_LONG).show();
} else if (accountKitLoginResult.getAccessToken() != null) {
launchContactsActivity();
}
}
}
}