Question

根据我的期望，用户在登录前不应看到任何页面。

执行应用时的当前行为：
显示主页（约一秒） - ＆gt;显示登录页面

预期行为：
显示登录页面 - ＆gt;已登录 - ＆gt;显示主页

问题：

如何将当前行为修改为预期行为？
根据运行流程（下面附带），在＆＃34; MainActivity的片段：onCreate＆＃34;之前触发登录页面。为什么主页面在登录页面之前出现？
主线程调用startActivityForResult（）后，是否应该停止并等待用户登录？为什么它继续运行？

非常感谢你的帮助。

APP中有一个活动和两个片段 FirebaseAuth UI（登录页面）在onResume（）方法上触发。

Here is the app's running flow:
MainActivity: onCreate: 
MainActivity: onStart: 
MainActivity: onResume: 
MainActivity: startLoginProcess: Show Login page
MainActivity's fragment: onCreate: 
MainActivity's fragment: onActivityCreated: 
MainActivity's fragment: onStart: 
MainActivity's fragment: onResume: 
MainActivity's fragment: onPause: 
MainActivity: onPause: 
MainActivity's fragment: onStop: 
MainActivity: onStop:

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.android.fastorder">

<application
    android:allowBackup="false"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".ui.MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>
</application>

</manifest>

public class MainActivity extends AppCompatActivity {

private static final int RC_SIGN_IN = 1;
private static final String TAG = "MainActivity";
private FirebaseAuth mFirebaseAuth;
private FirebaseAuth.AuthStateListener mAuthStatListener;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    initializeScreen();
    setupLogin();

    Log.d(TAG, "onCreate: ");


}


@Override
protected void onStart() {
    super.onStart();
    Log.d(TAG, "onStart: ");
}

@Override
protected void onStop() {
    super.onStop();
    Log.d(TAG, "onStop: ");
}

@Override
protected void onResume() {
    super.onResume();
    mFirebaseAuth.addAuthStateListener(mAuthStatListener);
    Log.d(TAG, "onResume: ");
}

@Override
protected void onPause() {
    super.onPause();
    mFirebaseAuth.removeAuthStateListener(mAuthStatListener);
    Log.d(TAG, "onPause: ");
}

private void initializeScreen() {
    ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
    PanelFragmentAdapter panelFragmentAdapter = new PanelFragmentAdapter(getSupportFragmentManager(),
            MainActivity.this);
    viewPager.setOffscreenPageLimit(2);
    viewPager.setAdapter(panelFragmentAdapter);

    TabLayout tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
    tabLayout.setupWithViewPager(viewPager);


}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    // RC_SIGN_IN is the request code you passed into startActivityForResult(...) when starting the sign in flow.
    if (requestCode == RC_SIGN_IN) {
        if (resultCode == RESULT_OK) {
            Toast.makeText(this, "signed in success", Toast.LENGTH_SHORT).show();
        } else if (resultCode == RESULT_CANCELED) {
            Toast.makeText(this, "user canceled", Toast.LENGTH_SHORT).show();
            finish();
        } else {
            Toast.makeText(this, "signed in failed", Toast.LENGTH_SHORT).show();
        }
    }
}

private void setupLogin() {
    mFirebaseAuth = FirebaseAuth.getInstance();
    mAuthStatListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();
            if (user != null) {
                // user is signed in
                Toast.makeText(MainActivity.this, "signed in", Toast.LENGTH_SHORT).show();
            } else {
                // user is signed out
                startLoginProcess();

            }
        }
    };
}

private void startLoginProcess() {
    Log.d(TAG, "startLoginProcess: Show Login page");
    startActivityForResult(
            AuthUI.getInstance()
                    .createSignInIntentBuilder()
                    .setIsSmartLockEnabled(false)
                    .setAvailableProviders(Arrays.asList(
                            new AuthUI.IdpConfig.EmailBuilder().build(),
                            new AuthUI.IdpConfig.GoogleBuilder().build()))
                    .build(),
            RC_SIGN_IN);
}

/**
 * Created by yorick on 2018/2/2.
 */

public class PanelFragmentAdapter extends FragmentPagerAdapter {
    private Context context;

    private String[] mTitles = new String[]{"menu", "order"};

    public PanelFragmentAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.context = context;
    }


    @Override
    public Fragment getItem(int position) {
        Fragment fragment = null;

        switch (position) {
            case 0:
                fragment = MenuFragment.newInstance();
                break;
            case 1:
                fragment = PanelOrderFragment.newInstance();
                break;
            default:
                fragment = MenuFragment.newInstance();
        }

        return fragment;

    }

    @Override
    public int getCount() {
        return 2;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mTitles[position];
    }
}

}

Answer 1

在清单文件中，检查您声明为启动器活动的活动。如果您可以在此向我们展示您的清单文件以及您的登录活动代码，那将非常有用。

编辑：此外，因为您首先OriginalValue Result --------------------------------------- --------------------------------------- 19.91 19.90000000 19.92 19.90000000 19.93 19.95000000 19.94 19.95000000 19.95 19.95000000 19.96 19.95000000 19.97 19.95000000 19.98 20.00000000 19.99 20.00000000然后

setContentView(R.layout.activity_main);

在您的登录过程开始之前显示您的主要活动是有意义的。

Answer 2

在您的清单中，将<intent-filter>更改为您的LoginActivity

 <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>

更改以上行

为什么主页在登录页面之前显示？

2 个答案: