Java tutorial
/* * This is the source code of Telegram for Android v. 1.3.x. * It is licensed under GNU GPL v. 2 or later. * You should have received a copy of the license in this archive (see LICENSE). * * Copyright Nikolai Kudashov, 2013-2016. */ package org.telegram.ui; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.support.v4.content.ContextCompat; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AdapterView; import android.widget.EditText; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.TextView; import org.telegram.messenger.AndroidUtilities; import org.telegram.messenger.FileLog; import org.telegram.messenger.LocaleController; import org.telegram.messenger.R; import org.telegram.messenger.Utilities; import org.telegram.ui.Adapters.BaseFragmentAdapter; import org.telegram.ui.Cells.TextSettingsCell; import org.telegram.ui.ActionBar.ActionBar; import org.telegram.ui.ActionBar.ActionBarMenu; import org.telegram.ui.ActionBar.ActionBarMenuItem; import org.telegram.ui.ActionBar.BaseFragment; import org.telegram.ui.Components.ForegroundFrameLayout; import org.telegram.ui.Components.LayoutHelper; import java.util.ArrayList; import java.util.Timer; import java.util.TimerTask; public class LanguageSelectActivity extends BaseFragment { private BaseFragmentAdapter listAdapter; private ListView listView; private boolean searchWas; private boolean searching; private BaseFragmentAdapter searchListViewAdapter; private TextView emptyTextView; private Timer searchTimer; public ArrayList<LocaleController.LocaleInfo> searchResult; @Override public View createView(Context context) { searching = false; searchWas = false; actionBar.setBackButtonImage(R.drawable.ic_ab_back); actionBar.setAllowOverlayTitle(true); actionBar.setTitle(LocaleController.getString("Language", R.string.Language)); actionBar.setActionBarMenuOnItemClick(new ActionBar.ActionBarMenuOnItemClick() { @Override public void onItemClick(int id) { if (id == -1) { finishFragment(); } } }); ActionBarMenu menu = actionBar.createMenu(); ActionBarMenuItem item = menu.addItem(0, R.drawable.ic_ab_search).setIsSearchField(true) .setActionBarMenuItemSearchListener(new ActionBarMenuItem.ActionBarMenuItemSearchListener() { @Override public void onSearchExpand() { searching = true; } @Override public void onSearchCollapse() { search(null); searching = false; searchWas = false; if (listView != null) { emptyTextView.setVisibility(View.GONE); listView.setAdapter(listAdapter); } } @Override public void onTextChanged(EditText editText) { String text = editText.getText().toString(); search(text); if (text.length() != 0) { searchWas = true; if (listView != null) { listView.setAdapter(searchListViewAdapter); } } } }); item.getSearchField().setHint(LocaleController.getString("Search", R.string.Search)); listAdapter = new ListAdapter(context); searchListViewAdapter = new SearchAdapter(context); fragmentView = new FrameLayout(context); fragmentView.setBackgroundColor(ContextCompat.getColor(context, R.color.card_background)); LinearLayout emptyTextLayout = new LinearLayout(context); emptyTextLayout.setVisibility(View.INVISIBLE); emptyTextLayout.setOrientation(LinearLayout.VERTICAL); ((FrameLayout) fragmentView).addView(emptyTextLayout); FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) emptyTextLayout.getLayoutParams(); layoutParams.width = LayoutHelper.MATCH_PARENT; layoutParams.height = LayoutHelper.MATCH_PARENT; layoutParams.gravity = Gravity.TOP; emptyTextLayout.setLayoutParams(layoutParams); emptyTextLayout.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return true; } }); emptyTextView = new TextView(context); emptyTextView.setTextColor(0xff808080); emptyTextView.setTextSize(20); emptyTextView.setGravity(Gravity.CENTER); emptyTextView.setText(LocaleController.getString("NoResult", R.string.NoResult)); emptyTextLayout.addView(emptyTextView); LinearLayout.LayoutParams layoutParams1 = (LinearLayout.LayoutParams) emptyTextView.getLayoutParams(); layoutParams1.width = LayoutHelper.MATCH_PARENT; layoutParams1.height = LayoutHelper.MATCH_PARENT; layoutParams1.weight = 0.5f; emptyTextView.setLayoutParams(layoutParams1); FrameLayout frameLayout = new FrameLayout(context); emptyTextLayout.addView(frameLayout); layoutParams1 = (LinearLayout.LayoutParams) frameLayout.getLayoutParams(); layoutParams1.width = LayoutHelper.MATCH_PARENT; layoutParams1.height = LayoutHelper.MATCH_PARENT; layoutParams1.weight = 0.5f; frameLayout.setLayoutParams(layoutParams1); listView = new ListView(context); listView.setEmptyView(emptyTextLayout); listView.setVerticalScrollBarEnabled(false); listView.setDivider(null); listView.setDividerHeight(0); listView.setAdapter(listAdapter); ((FrameLayout) fragmentView).addView(listView); layoutParams = (FrameLayout.LayoutParams) listView.getLayoutParams(); layoutParams.width = LayoutHelper.MATCH_PARENT; layoutParams.height = LayoutHelper.MATCH_PARENT; listView.setLayoutParams(layoutParams); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { LocaleController.LocaleInfo localeInfo = null; if (searching && searchWas) { if (i >= 0 && i < searchResult.size()) { localeInfo = searchResult.get(i); } } else { if (i >= 0 && i < LocaleController.getInstance().sortedLanguages.size()) { localeInfo = LocaleController.getInstance().sortedLanguages.get(i); } } if (localeInfo != null) { LocaleController.getInstance().applyLanguage(localeInfo, true); parentLayout.rebuildAllFragmentViews(false); } finishFragment(); } }); listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) { LocaleController.LocaleInfo localeInfo = null; if (searching && searchWas) { if (i >= 0 && i < searchResult.size()) { localeInfo = searchResult.get(i); } } else { if (i >= 0 && i < LocaleController.getInstance().sortedLanguages.size()) { localeInfo = LocaleController.getInstance().sortedLanguages.get(i); } } if (localeInfo == null || localeInfo.pathToFile == null || getParentActivity() == null) { return false; } final LocaleController.LocaleInfo finalLocaleInfo = localeInfo; AlertDialog.Builder builder = new AlertDialog.Builder(getParentActivity()); builder.setMessage(LocaleController.getString("DeleteLocalization", R.string.DeleteLocalization)); builder.setTitle(LocaleController.getString("AppName", R.string.AppName)); builder.setPositiveButton(LocaleController.getString("Delete", R.string.Delete), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { if (LocaleController.getInstance().deleteLanguage(finalLocaleInfo)) { if (searchResult != null) { searchResult.remove(finalLocaleInfo); } if (listAdapter != null) { listAdapter.notifyDataSetChanged(); } if (searchListViewAdapter != null) { searchListViewAdapter.notifyDataSetChanged(); } } } }); builder.setNegativeButton(LocaleController.getString("Cancel", R.string.Cancel), null); showDialog(builder.create()); return true; } }); listView.setOnScrollListener(new AbsListView.OnScrollListener() { @Override public void onScrollStateChanged(AbsListView absListView, int i) { if (i == SCROLL_STATE_TOUCH_SCROLL && searching && searchWas) { AndroidUtilities.hideKeyboard(getParentActivity().getCurrentFocus()); } } @Override public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } }); return fragmentView; } @Override public void onResume() { super.onResume(); if (listAdapter != null) { listAdapter.notifyDataSetChanged(); } } public void search(final String query) { if (query == null) { searchResult = null; } else { try { if (searchTimer != null) { searchTimer.cancel(); } } catch (Exception e) { FileLog.e("tmessages", e); } searchTimer = new Timer(); searchTimer.schedule(new TimerTask() { @Override public void run() { try { searchTimer.cancel(); searchTimer = null; } catch (Exception e) { FileLog.e("tmessages", e); } processSearch(query); } }, 100, 300); } } private void processSearch(final String query) { Utilities.searchQueue.postRunnable(new Runnable() { @Override public void run() { String q = query.trim().toLowerCase(); if (q.length() == 0) { updateSearchResults(new ArrayList<LocaleController.LocaleInfo>()); return; } long time = System.currentTimeMillis(); ArrayList<LocaleController.LocaleInfo> resultArray = new ArrayList<>(); for (LocaleController.LocaleInfo c : LocaleController.getInstance().sortedLanguages) { if (c.name.toLowerCase().startsWith(query) || c.nameEnglish.toLowerCase().startsWith(query)) { resultArray.add(c); } } updateSearchResults(resultArray); } }); } private void updateSearchResults(final ArrayList<LocaleController.LocaleInfo> arrCounties) { AndroidUtilities.runOnUIThread(new Runnable() { @Override public void run() { searchResult = arrCounties; searchListViewAdapter.notifyDataSetChanged(); } }); } private class SearchAdapter extends BaseFragmentAdapter { private Context mContext; public SearchAdapter(Context context) { mContext = context; } @Override public boolean areAllItemsEnabled() { return true; } @Override public boolean isEnabled(int i) { return true; } @Override public int getCount() { if (searchResult == null) { return 0; } return searchResult.size(); } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return i; } @Override public boolean hasStableIds() { return false; } @Override public View getView(int i, View view, ViewGroup viewGroup) { if (view == null) { view = new TextSettingsCell(mContext); view.setElevation(0); view.setBackground(null); ((ForegroundFrameLayout) view).setForeground(R.drawable.list_selector); } LocaleController.LocaleInfo c = searchResult.get(i); ((TextSettingsCell) view).setText(c.name, i != searchResult.size() - 1); return view; } @Override public int getItemViewType(int i) { return 0; } @Override public int getViewTypeCount() { return 1; } @Override public boolean isEmpty() { return searchResult == null || searchResult.size() == 0; } } private class ListAdapter extends BaseFragmentAdapter { private Context mContext; public ListAdapter(Context context) { mContext = context; } @Override public boolean areAllItemsEnabled() { return true; } @Override public boolean isEnabled(int i) { return true; } @Override public int getCount() { if (LocaleController.getInstance().sortedLanguages == null) { return 0; } return LocaleController.getInstance().sortedLanguages.size(); } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return i; } @Override public boolean hasStableIds() { return false; } @Override public View getView(int i, View view, ViewGroup viewGroup) { if (view == null) { view = new TextSettingsCell(mContext); view.setElevation(0); view.setBackground(null); ((ForegroundFrameLayout) view).setForeground(R.drawable.list_selector); } LocaleController.LocaleInfo localeInfo = LocaleController.getInstance().sortedLanguages.get(i); ((TextSettingsCell) view).setText(localeInfo.name, i != LocaleController.getInstance().sortedLanguages.size() - 1); return view; } @Override public int getItemViewType(int i) { return 0; } @Override public int getViewTypeCount() { return 1; } @Override public boolean isEmpty() { return LocaleController.getInstance().sortedLanguages == null || LocaleController.getInstance().sortedLanguages.size() == 0; } } }