src/main/java/de/pixart/messenger/ui/AbstractSearchableListItemActivity.java


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package de.pixart.messenger.ui;

import android.content.Context;
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

import de.pixart.messenger.R;
import de.pixart.messenger.databinding.ActivityChooseContactBinding;
import de.pixart.messenger.entities.ListItem;
import de.pixart.messenger.ui.adapter.ListItemAdapter;

public abstract class AbstractSearchableListItemActivity extends XmppActivity {
    protected ActivityChooseContactBinding binding;
    private final List<ListItem> listItems = new ArrayList<>();
    private ArrayAdapter<ListItem> mListItemsAdapter;

    private EditText mSearchEditText;

    private final MenuItem.OnActionExpandListener mOnActionExpandListener = new MenuItem.OnActionExpandListener() {

        @Override
        public boolean onMenuItemActionExpand(final MenuItem item) {
            mSearchEditText.post(new Runnable() {

                @Override
                public void run() {
                    mSearchEditText.requestFocus();
                    final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                    imm.showSoftInput(mSearchEditText,
                            InputMethodManager.SHOW_IMPLICIT);
                }
            });

            return true;
        }

        @Override
        public boolean onMenuItemActionCollapse(final MenuItem item) {
            final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(mSearchEditText.getWindowToken(),
                    InputMethodManager.HIDE_IMPLICIT_ONLY);
            mSearchEditText.setText("");
            filterContacts();
            return true;
        }
    };

    private final TextWatcher mSearchTextWatcher = new TextWatcher() {

        @Override
        public void afterTextChanged(final Editable editable) {
            filterContacts(editable.toString());
        }

        @Override
        public void beforeTextChanged(final CharSequence s, final int start, final int count,
                                      final int after) {
        }

        @Override
        public void onTextChanged(final CharSequence s, final int start, final int before,
                                  final int count) {
        }
    };

    public ListView getListView() {
        return binding.chooseContactList;
    }

    public List<ListItem> getListItems() {
        return listItems;
    }

    public EditText getSearchEditText() {
        return mSearchEditText;
    }

    public ArrayAdapter<ListItem> getListItemAdapter() {
        return mListItemsAdapter;
    }

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.binding = DataBindingUtil.setContentView(this, R.layout.activity_choose_contact);
        setSupportActionBar((Toolbar) binding.toolbar);
        configureActionBar(getSupportActionBar());
        this.binding.chooseContactList.setFastScrollEnabled(true);
        mListItemsAdapter = new ListItemAdapter(this, listItems);
        this.binding.chooseContactList.setAdapter(mListItemsAdapter);
    }

    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        getMenuInflater().inflate(R.menu.choose_contact, menu);
        final MenuItem menuSearchView = menu.findItem(R.id.action_search);
        final View mSearchView = menuSearchView.getActionView();
        mSearchEditText = mSearchView.findViewById(R.id.search_field);
        mSearchEditText.addTextChangedListener(mSearchTextWatcher);
        menuSearchView.setOnActionExpandListener(mOnActionExpandListener);
        return true;
    }

    protected void filterContacts() {
        final String needle = mSearchEditText != null ? mSearchEditText.getText().toString() : null;
        if (needle != null && !needle.isEmpty()) {
            filterContacts(needle);
        } else {
            filterContacts(null);
        }
    }

    protected abstract void filterContacts(final String needle);

    @Override
    void onBackendConnected() {
        filterContacts();
    }
}