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The main Activity outlined in the blog post.
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
import com.google.android.gms.auth.GoogleAuthUtil;
import com.google.android.gms.common.AccountPicker;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
public class AuthActivity extends Activity {
static final int REQUEST_CODE_RECOVER_PLAY_SERVICES = 1001;
static final int REQUEST_CODE_PICK_ACCOUNT = 1002;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
protected void onResume() {
super.onResume();
if (checkPlayServices() && checkUserAccount()) {
// Then we're good to go!
}
}
private boolean checkPlayServices() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (status != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(status)) {
showErrorDialog(status);
} else {
Toast.makeText(this, "This device is not supported.", Toast.LENGTH_LONG).show();
finish();
}
return false;
}
return true;
}
void showErrorDialog(int code) {
GooglePlayServicesUtil.getErrorDialog(code, this, REQUEST_CODE_RECOVER_PLAY_SERVICES).show();
}
private boolean checkUserAccount() {
String accountName = AccountUtils.getAccountName(this);
if (accountName == null) {
// Then the user was not found in the SharedPreferences. Either the
// application deliberately removed the account, or the application's
// data has been forcefully erased.
showAccountPicker();
return false;
}
Account account = AccountUtils.getGoogleAccountByName(this, accountName);
if (account == null) {
// Then the account has since been removed.
AccountUtils.removeAccount(this);
showAccountPicker();
return false;
}
return true;
}
private void showAccountPicker() {
Intent pickAccountIntent = AccountPicker.newChooseAccountIntent(null, null,
new String[] { GoogleAuthUtil.GOOGLE_ACCOUNT_TYPE }, true, null, null, null, null);
startActivityForResult(pickAccountIntent, REQUEST_CODE_PICK_ACCOUNT);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_CODE_RECOVER_PLAY_SERVICES:
if (resultCode == RESULT_CANCELED) {
Toast.makeText(this, "Google Play Services must be installed and up-to-date.",
Toast.LENGTH_SHORT).show();
finish();
}
return;
case REQUEST_CODE_PICK_ACCOUNT:
if (resultCode == RESULT_OK) {
String accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
AccountUtils.setAccountName(this, accountName);
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(this, "This application requires a Google account.",
Toast.LENGTH_SHORT).show();
finish();
}
return;
}
super.onActivityResult(requestCode, resultCode, data);
}
}
@richardrussell

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richardrussell commented Feb 25, 2013

Hi Alex,

Thanks for this, very useful.

I initially found it through a gist search, and then spent a while hunting for your blog. Might be worth adding a pointer to help people find the relevant blog post on the description in gist - something like "The main activity outlined in the blog post: http://www.androiddesignpatterns.com/2013/01/google-play-services-setup.html".

Cheers,

Richard

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