Update default account preference settings dialog

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.preference.ListPreference;

import android.util.AttributeSet;

import android.view.View;

import com.android.contacts.common.model.AccountTypeManager;

import com.android.contacts.common.model.account.AccountType;

import com.android.contacts.common.model.account.AccountTypeWithDataSet;

import com.android.contacts.common.model.account.AccountWithDataSet;

import com.android.contacts.common.util.AccountsListAdapter;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Set;

public class DefaultAccountPreference extends ListPreference {

    private ContactsPreferences mPreferences;

    private Map<String, AccountWithDataSet> mAccountMap;

    private int mClickedDialogEntryIndex;

    private AccountsListAdapter mListAdapter;

    public DefaultAccountPreference(Context context) {

        super(context);

    private void prepare() {

        mPreferences = new ContactsPreferences(getContext());

        mAccountMap = new HashMap<>();

        final AccountTypeManager accountTypeManager = AccountTypeManager.getInstance(getContext());

        List<AccountWithDataSet> accounts = accountTypeManager.getAccounts(true);

        for (AccountWithDataSet account : accounts) {

        mListAdapter = new AccountsListAdapter(getContext(),

                AccountsListAdapter.AccountListFilter.ACCOUNTS_CONTACT_WRITABLE);

        final String[] accountNamesArray = new String[mListAdapter.getCount()];

        for (int i = 0; i < mListAdapter.getCount(); i++) {

            final AccountWithDataSet account = mListAdapter.getItem(i);

            mAccountMap.put(account.name, account);

            accountNamesArray[i] = account.name;

        }

        final Set<String> accountNames = mAccountMap.keySet();

        final String[] accountNamesArray = accountNames.toArray(new String[accountNames.size()]);

        setEntries(accountNamesArray);

        setEntryValues(accountNamesArray);

        final String defaultAccount = String.valueOf(mPreferences.getDefaultAccount());

        if (accounts.size() == 1) {

            setValue(accounts.get(0).name);

        } else if (accountNames.contains(defaultAccount)) {

        if (mListAdapter.getCount() == 1) {

            setValue(mListAdapter.getItem(0).name);

        } else if (mAccountMap.keySet().contains(defaultAccount)) {

            setValue(defaultAccount);

        } else {

            setValue(null);

    }

    @Override

    // UX recommendation is not to show cancel button on such lists.

    protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {

        super.onPrepareDialogBuilder(builder);

        // UX recommendation is not to show cancel button on such lists.

        builder.setNegativeButton(null, null);

        // Override and do everything ListPreference does except relative to our custom adapter.

        // onDialogClosed needs to be overridden as well since mClickedDialogEntryIndex is private

        // in ListPreference.

        builder.setAdapter(mListAdapter, new DialogInterface.OnClickListener() {

            @Override

            public void onClick(DialogInterface dialog, int which) {

                mClickedDialogEntryIndex = which;

                // Clicking on an item simulates the positive button click,

                // and dismisses the dialog.

                DefaultAccountPreference.this.onClick(dialog, DialogInterface.BUTTON_POSITIVE);

                dialog.dismiss();

            }

        });

    }

    @Override

    protected void onDialogClosed(boolean positiveResult) {

        if (positiveResult && mClickedDialogEntryIndex >= 0 && getEntryValues() != null) {

            final String value = getEntryValues()[mClickedDialogEntryIndex].toString();

            if (callChangeListener(value)) {

                setValue(value);

            }

        }

    }

}