Support for picking a printer for iOS and Android
This commit is contained in:
Sebastián Katzer
339
src/android/ui/SelectPrinterActivity.java
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339
src/android/ui/SelectPrinterActivity.java
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/*
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Copyright 2013-2016 appPlant GmbH
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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*/
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package de.appplant.cordova.plugin.printer.ui;
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import android.annotation.SuppressLint;
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import android.app.Activity;
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import android.content.Intent;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager;
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import android.content.pm.PackageManager.NameNotFoundException;
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import android.graphics.drawable.Drawable;
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import android.os.Bundle;
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import android.print.PrinterId;
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import android.print.PrinterInfo;
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import android.text.TextUtils;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.AdapterView;
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import android.widget.BaseAdapter;
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import android.widget.ImageView;
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import android.widget.ListView;
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import android.widget.TextView;
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import java.util.ArrayList;
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import java.util.List;
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import de.appplant.cordova.plugin.printer.ext.PrintManager;
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import de.appplant.cordova.plugin.printer.ext.PrinterDiscoverySession;
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import de.appplant.cordova.plugin.printer.ext.PrinterDiscoverySession.OnPrintersChangeListener;
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import de.appplant.cordova.plugin.printer.reflect.Meta;
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@SuppressLint("SetTextI18n")
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public final class SelectPrinterActivity extends Activity {
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/**
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* The extra string to identify the data from the intents bundle.
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*/
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public static final String EXTRA_PRINTER_ID =
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"INTENT_EXTRA_PRINTER_ID";
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/**
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* Reference to the main view which lists all discovered printers.
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*/
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private ListView listView;
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/**
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* Session for printer discovering within the network.
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*/
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private PrinterDiscoverySession discoverySession;
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/**
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* Called when the activity is starting.
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*
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* @param savedInstanceState If the activity is being re-initialized
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* after previously being shut down then this
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* Bundle contains the data it most recently
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* supplied in.
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*/
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(Meta.getResId(
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this, "layout", "select_printer_activity"));
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discoverySession = new PrintManager(this).createPrinterDiscoverySession();
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listView = (ListView) findViewById(android.R.id.list);
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initListView();
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startPrinterDiscovery();
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updateEmptyView();
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}
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/**
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* Perform any final cleanup before an activity is destroyed.
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*/
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@Override
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protected void onDestroy() {
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discoverySession.destroy();
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super.onDestroy();
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}
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/**
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* Sends an intent with the specified printer back to the owning activity
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* and finishes that activity.
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*
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* @param printerId The printerId object of the printer containing
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* everything necessary to identify and contact him.
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*/
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private void onPrinterSelected (PrinterId printerId) {
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Intent intent = new Intent();
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intent.putExtra(EXTRA_PRINTER_ID, printerId);
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setResult(RESULT_OK, intent);
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finish();
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}
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/**
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* Assigns the adapter and the click listener to the list.
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*/
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private void initListView() {
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listView.setAdapter(new ListViewAdapter());
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listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
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@Override
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public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
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if (!listView.getAdapter().isEnabled(position)) {
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return;
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}
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PrinterInfo printer = (PrinterInfo)
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listView.getAdapter().getItem(position);
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onPrinterSelected(printer.getId());
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}
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});
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}
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/**
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* Start printer discovery if there are installed services found on the
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* device.
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*/
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private void startPrinterDiscovery() {
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PrintManager pm = new PrintManager(this);
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if (pm.getInstalledPrintServices().isEmpty())
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return;
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discoverySession.startPrinterDiscovery();
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}
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/**
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* Shows or hides the empty-view of the list view depend on if the
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* adapter contains any printers or not.
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*/
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private void updateEmptyView() {
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TextView titleView = (TextView) findViewById(android.R.id.title);
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View progressBar = findViewById(android.R.id.progress);
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if (listView.getEmptyView() == null) {
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View emptyView = findViewById(android.R.id.empty);
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listView.setEmptyView(emptyView);
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}
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if (discoverySession.isPrinterDiscoveryStarted()) {
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titleView.setText("Searching for printers");
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progressBar.setVisibility(View.VISIBLE);
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} else {
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titleView.setText("No printers found");
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progressBar.setVisibility(View.GONE);
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}
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}
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private final class ListViewAdapter extends BaseAdapter {
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/**
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* Wait lock for synchronization.
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*/
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private final Object lock = new Object();
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/**
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* List of all received printer to display in the list.
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*/
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private final List<PrinterInfo> printers = new ArrayList<PrinterInfo>();
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/**
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* Constructor registers a listener to monitor about newly discovered
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* printers.
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*/
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ListViewAdapter() {
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discoverySession.setOnPrintersChangeListener(new OnPrintersChangeListener() {
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@Override
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public void onPrintersChanged (List<PrinterInfo> printerInfos) {
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printers.addAll(printerInfos);
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notifyDataSetChanged();
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}
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});
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}
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/**
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* How many items are in the data set represented by this Adapter.
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*
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* @return Count of items.
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*/
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@Override
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public int getCount() {
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synchronized (lock) {
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return printers.size();
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}
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}
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/**
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* Get the data item associated with the specified position in the
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* data set.
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*
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* @param position Position of the item whose data we want within the
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* adapter's data set.
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*
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* @return The data at the specified position.
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*/
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@Override
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public Object getItem (int position) {
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synchronized (lock) {
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return printers.get(position);
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}
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}
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/**
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* Get the row id associated with the specified position in the list.
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*
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* @param position The position of the item within the adapter's data
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* set whose row id we want.
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*
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* @return The id of the item at the specified position.
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*/
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@Override
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public long getItemId (int position) {
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return position;
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}
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/**
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* Gets a View that displays in the drop down popup the data at the
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* specified position in the data set.
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*
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* @param pos The index of the item whose view we want.
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* @param view The old view to reuse, if possible. Note: You should
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* check that this view is non-null and of an appropriate
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* type before using. If it is not possible to convert
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* this view to display the correct data.
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* @param parent The parent that this view will eventually be
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* attached to.
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*
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* @return A View corresponding to the data at the specified position.
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*/
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@Override
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public View getDropDownView (int pos, View view, ViewGroup parent) {
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return getView(pos, view, parent);
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}
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/**
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* Get a View that displays the data at the specified position in the
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* data set.
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*
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* @param pos The position of the item within the adapter's data set
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* of the item whose view we want.
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* @param view The old view to reuse, if possible. Note: You should
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* check that this view is non-null and of an appropriate
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* type before using. If it is not possible to convert
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* this view to display the correct data.
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* @param parent The parent that this view will eventually be
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* attached to.
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*
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* @return A View corresponding to the data at the specified position.
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*/
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@Override
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public View getView (int pos, View view, ViewGroup parent) {
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PrinterInfo printer = (PrinterInfo) getItem(pos);
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CharSequence title = printer.getName();
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CharSequence subtitle = null;
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Drawable icon = null;
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if (view == null) {
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view = getLayoutInflater().inflate(
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Meta.getResId(getApplicationContext(), "layout", "printer_list_item"),
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parent, false);
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}
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try {
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PackageManager pm = getPackageManager();
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PrinterId pId = printer.getId();
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Object cmpName = Meta.invokeMethod(pId, "getServiceName");
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Object pkgName = Meta.invokeMethod(cmpName, "getPackageName");
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PackageInfo packageInfo = pm.getPackageInfo(
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(String) pkgName, 0);
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subtitle = packageInfo.applicationInfo.loadLabel(pm);
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icon = packageInfo.applicationInfo.loadIcon(pm);
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} catch (NameNotFoundException e) {
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/* ignore */
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}
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TextView titleView = (TextView) view.findViewById(android.R.id.title);
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titleView.setText(title);
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TextView subtitleView = (TextView) view.findViewById(android.R.id.hint);
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if (!TextUtils.isEmpty(subtitle)) {
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subtitleView.setText(subtitle);
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subtitleView.setVisibility(View.VISIBLE);
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} else {
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subtitleView.setText(null);
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subtitleView.setVisibility(View.GONE);
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}
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ImageView iconView = (ImageView) view.findViewById(android.R.id.icon);
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if (icon != null) {
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iconView.setImageDrawable(icon);
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iconView.setVisibility(View.VISIBLE);
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} else {
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iconView.setVisibility(View.GONE);
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}
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return view;
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}
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/**
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* Indicate whether the specified printer by position is available.
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*
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* @param position The position of the printer in the list.
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*
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* @return A truthy value means that the printer is available.
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*/
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@Override
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public boolean isEnabled (int position) {
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PrinterInfo printer = (PrinterInfo) getItem(position);
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return printer.getStatus() != PrinterInfo.STATUS_UNAVAILABLE;
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}
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}
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}
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