Java tutorial
/* * PowerSwitch by Max Rosin & Markus Ressel * Copyright (C) 2015 Markus Ressel * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package eu.power_switch.gui.dialog; import android.app.Dialog; import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.Intent; import android.content.IntentFilter; import android.graphics.Color; import android.net.wifi.ScanResult; import android.net.wifi.WifiManager; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.design.widget.TextInputEditText; import android.support.v4.app.DialogFragment; import android.support.v4.content.LocalBroadcastManager; import android.support.v7.app.AlertDialog; import android.text.Editable; import android.text.TextUtils; import android.text.TextWatcher; import android.util.SparseBooleanArray; import android.view.LayoutInflater; import android.view.View; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.Toast; import com.mikepenz.iconics.view.IconicsImageView; import java.util.ArrayList; import java.util.List; import eu.power_switch.R; import eu.power_switch.gui.StatusMessageHandler; import eu.power_switch.gui.animation.AnimationHandler; import eu.power_switch.shared.constants.LocalBroadcastConstants; /** * Dialog to create a new Room */ public class AddSsidDialog extends DialogFragment { public static final String KEY_SSID = "SSID"; private Dialog dialog; private int defaultTextColor; private View contentView; private ArrayList<String> ssids = new ArrayList<>(); private ListView listView; private BroadcastReceiver broadcastReceiver; private WifiManager mainWifi; private ArrayAdapter<String> ssidAdapter; private LinearLayout layoutLoading; private TextInputEditText editText_ssid; /** * Used to notify the setup page that some info has changed * * @param context any suitable context */ public static void sendSsidAddedBroadcast(Context context, ArrayList<String> ssid) { Intent intent = new Intent(LocalBroadcastConstants.INTENT_GATEWAY_SSID_ADDED); intent.putStringArrayListExtra(KEY_SSID, ssid); LocalBroadcastManager.getInstance(context).sendBroadcast(intent); } @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { ArrayList<String> connections = new ArrayList<>(); for (ScanResult scanResult : mainWifi.getScanResults()) { if (scanResult.SSID != null && !scanResult.SSID.isEmpty()) { connections.add(scanResult.SSID); } } updateSSIDs(connections); layoutLoading.setVisibility(View.GONE); listView.setVisibility(View.VISIBLE); } }; mainWifi = (WifiManager) getActivity().getSystemService(Context.WIFI_SERVICE); LayoutInflater inflater = getActivity().getLayoutInflater(); contentView = inflater.inflate(R.layout.dialog_add_ssid, null); builder.setView(contentView); editText_ssid = (TextInputEditText) contentView.findViewById(R.id.editText_ssid); editText_ssid.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { checkValidity(); } }); final IconicsImageView refresh = (IconicsImageView) contentView.findViewById(R.id.button_refresh); refresh.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (mainWifi.isWifiEnabled()) { refresh.startAnimation(AnimationHandler.getRotationClockwiseAnimation(getContext())); refreshSsids(); } else { Toast.makeText(getActivity(), "WiFi disabled!", Toast.LENGTH_LONG).show(); } } }); layoutLoading = (LinearLayout) contentView.findViewById(R.id.layoutLoading); listView = (ListView) contentView.findViewById(R.id.listView); ssidAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_multiple_choice, ssids); listView.setAdapter(ssidAdapter); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { checkValidity(); } }); builder.setTitle(R.string.add_ssids); builder.setPositiveButton(R.string.add, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { try { sendSsidAddedBroadcast(getContext(), getSelectedSSIDs()); } catch (Exception e) { StatusMessageHandler.showErrorMessage(getTargetFragment().getView().findViewById(R.id.listView), e); } } }); builder.setNeutralButton(android.R.string.cancel, null); setPositiveButtonVisibility(false); dialog = builder.create(); dialog.setCanceledOnTouchOutside(false); // prevent close dialog on touch outside window dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN); dialog.show(); defaultTextColor = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).getTextColors() .getDefaultColor(); checkValidity(); refreshSsids(); return dialog; } private ArrayList<String> getSelectedSSIDs() { ArrayList<String> selectedSSIDs = new ArrayList<>(); // manual String manualSsid = editText_ssid.getText().toString().trim(); if (!TextUtils.isEmpty(manualSsid)) { selectedSSIDs.add(manualSsid); } // available networks int len = listView.getCount(); SparseBooleanArray checked = listView.getCheckedItemPositions(); for (int i = 0; i < len; i++) { if (checked.get(i)) { String item = ssids.get(i); /* do whatever you want with the checked item */ selectedSSIDs.add(item); } } return selectedSSIDs; } private void refreshSsids() { layoutLoading.setVisibility(View.VISIBLE); listView.setVisibility(View.GONE); mainWifi.startScan(); } private void updateSSIDs(List<String> ssids) { this.ssids.clear(); this.ssids.addAll(ssids); ssidAdapter.notifyDataSetChanged(); checkValidity(); } private void checkValidity() { if (getSelectedSSIDs().isEmpty()) { setPositiveButtonVisibility(false); } else { setPositiveButtonVisibility(true); } } private void setPositiveButtonVisibility(boolean visibility) { if (dialog != null) { if (visibility) { ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(defaultTextColor); ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setClickable(true); } else { ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(Color.GRAY); ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setClickable(false); } } } @Override public void onStart() { super.onStart(); IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION); // use activity directly, otherwise the intent wont be catched (alternative way below) getActivity().registerReceiver(broadcastReceiver, intentFilter); // LocalBroadcastManager.getInstance(getActivity()).registerReceiver(broadcastReceiver, intentFilter); } @Override public void onStop() { // LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(broadcastReceiver); getActivity().unregisterReceiver(broadcastReceiver); super.onStop(); } }