src/com/android/bips/ui/MoreOptionsActivity.java

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.bips.ui;

import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.print.PrintJobInfo;
import android.print.PrinterId;
import android.printservice.PrintService;
import android.view.MenuItem;

import com.android.bips.BuiltInPrintService;
import com.android.bips.discovery.DiscoveredPrinter;
import com.android.bips.discovery.Discovery;

import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * Launched by system in response to a "More Options" request while tracking a printer.
 */
public class MoreOptionsActivity extends Activity implements ServiceConnection, Discovery.Listener {
    private BuiltInPrintService mPrintService;
    PrinterId mPrinterId;
    DiscoveredPrinter mPrinter;
    InetAddress mPrinterAddress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        PrintJobInfo jobInfo = getIntent().getParcelableExtra(PrintService.EXTRA_PRINT_JOB_INFO);
        mPrinterId = jobInfo.getPrinterId();

        ActionBar actionBar = getActionBar();
        if (actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
        getFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                onBackPressed();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onStart() {
        super.onStart();
        bindService(new Intent(this, BuiltInPrintService.class), this,
                Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mPrintService != null) {
            mPrintService.getDiscovery().stop(this);
        }
        unbindService(this);
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        mPrintService = BuiltInPrintService.getInstance();
        mPrintService.getDiscovery().start(this);
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        mPrintService = null;
    }

    @Override
    public void onPrinterFound(DiscoveredPrinter printer) {
        if (printer.getUri().toString().equals(mPrinterId.getLocalId())) {
            // We discovered a printer matching the job's PrinterId, so show recommendations
            mPrinter = printer;
            setTitle(mPrinter.name);
            try {
                mPrinterAddress = InetAddress.getByName(mPrinter.path.getHost());
                if (getFragmentManager().getFragments().isEmpty()) {
                    MoreOptionsFragment fragment = new MoreOptionsFragment();
                    getFragmentManager().beginTransaction()
                            .replace(android.R.id.content, fragment)
                            .commit();
                }
                // No need for continued discovery after we find the printer.
                mPrintService.getDiscovery().stop(this);
            } catch (UnknownHostException ignored) { }
        }
    }

    @Override
    public void onPrinterLost(DiscoveredPrinter printer) {
        // Ignore
    }
}