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Android Authenticator launches login screen when no account

I built Authenticator, I built SyncAdapter (both can be done manually through settings on the emulator).

How to make an application launch the login screen (addAccount method) when the application starts, if the account is not found?

Here is my Manifest.xml ...

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lateral.myapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="14"/>

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS"/>
    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS"/>
    <uses-permission android:name="android.permission.USE_CREDENTIALS"/>    
    <uses-permission android:name="android.permission.READ_SYNC_STATS" />
    <uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
    <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />

    <application android:icon="@drawable/icon" android:label="@string/app_name" android:name=".myappApplication">
        <activity android:name=".ui.EventListActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

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

        <service android:name=".authenticator.AccountAuthenticatorService" android:exported="true" android:process=":auth">
            <intent-filter>
                <action android:name="android.accounts.AccountAuthenticator"/>
            </intent-filter>
            <meta-data android:name="android.accounts.AccountAuthenticator" android:resource="@xml/authenticator"/>
        </service>

        <service android:name="sync.EventsSyncAdapterService" android:exported="true" android:process=":events">
            <intent-filter>
                <action android:name="android.content.SyncAdapter" />
            </intent-filter>
            <meta-data android:name="android.content.SyncAdapter" android:resource="@xml/sync_events" />
        </service>

        <activity android:excludeFromRecents="true" android:name=".authenticator.myappAuthenticatorActivity">
            <!--
                No intent-filter here! This activity is only ever launched by
                someone who explicitly knows the class name
            -->
        </activity>
    </application>

</manifest>
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3 answers

Does the job go through AccountManager? Sort of:

 AccountManager accountManager = AccountManager.get(this);
 Account[] accounts = accountManager.getAccountsByType("myCustomAccount");
 if (accounts.length == 0) {
    accountManager.addAccount("myCustomAccount", null, null, null, this,
                               null, null);
  }
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"EventListActivity" onCreate , - . , "". Authenticator, EventListActivity , , 'setContentView' onCreate.

+1

Check if an account exists if you do not go to the login screen.

public static boolean accountExists(Context ctx, AccountManager accountManager) {
Account[] accounts = accountManager.getAccountsByType(
  ctx.getString(R.string.account_type)
);
return accounts.length > 0;
}
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