ためしに PrintService を作ってみた

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.zakky.myprintservice"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="19"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name=".MyPrintService"
                 android:permission="android.permission.BIND_PRINT_SERVICE">
            <intent-filter>
                <action android:name="android.printservice.PrintService" />
            </intent-filter>
        </service>
    </application>

</manifest>

MyPrintService.java

/*
 * Copyright 2013 YAMAZAKI Makoto<[email protected]>
 *
 * 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 org.zakky.myprintservice;

import android.print.PrintAttributes;
import android.print.PrinterCapabilitiesInfo;
import android.print.PrinterId;
import android.print.PrinterInfo;
import android.printservice.PrintDocument;
import android.printservice.PrintJob;
import android.printservice.PrintService;
import android.printservice.PrinterDiscoverySession;
import android.util.Log;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class MyPrintService extends PrintService {
    @Override
    protected PrinterDiscoverySession onCreatePrinterDiscoverySession() {
        Log.d("myprinter", "MyPrintService#onCreatePrinterDiscoverySession() called");

        return new PrinterDiscoverySession() {
            @Override
            public void onStartPrinterDiscovery(List<PrinterId> priorityList) {
                Log.d("myprinter", "PrinterDiscoverySession#onStartPrinterDiscovery(priorityList: " + priorityList + ") called");

                if (!priorityList.isEmpty()) {
                    return;
                }

                final List<PrinterInfo> printers = new ArrayList<>();
                final PrinterId printerId = generatePrinterId("aaa");
                final PrinterInfo.Builder builder = new PrinterInfo.Builder(printerId, "dummy printer", PrinterInfo.STATUS_IDLE);
                PrinterCapabilitiesInfo.Builder capBuilder = new PrinterCapabilitiesInfo.Builder(printerId);
                capBuilder.addMediaSize(PrintAttributes.MediaSize.ISO_A4, true);
                capBuilder.addMediaSize(PrintAttributes.MediaSize.ISO_A3, false);
                capBuilder.addResolution(new PrintAttributes.Resolution("resolutionId", "default resolution", 600, 600), true);
                capBuilder.setColorModes(PrintAttributes.COLOR_MODE_COLOR | PrintAttributes.COLOR_MODE_MONOCHROME, PrintAttributes.COLOR_MODE_COLOR);
                builder.setCapabilities(capBuilder.build());
                printers.add(builder.build());
                addPrinters(printers);
            }

            @Override
            public void onStopPrinterDiscovery() {
                Log.d("myprinter", "MyPrintService#onStopPrinterDiscovery() called");
            }

            @Override
            public void onValidatePrinters(List<PrinterId> printerIds) {
                Log.d("myprinter", "MyPrintService#onValidatePrinters(printerIds: " + printerIds + ") called");
            }

            @Override
            public void onStartPrinterStateTracking(PrinterId printerId) {
                Log.d("myprinter", "MyPrintService#onStartPrinterStateTracking(printerId: " + printerId + ") called");
            }

            @Override
            public void onStopPrinterStateTracking(PrinterId printerId) {
                Log.d("myprinter", "MyPrintService#onStopPrinterStateTracking(printerId: " + printerId + ") called");
            }

            @Override
            public void onDestroy() {
                Log.d("myprinter", "MyPrintService#onDestroy() called");
            }
        };
    }

    @Override
    protected void onPrintJobQueued(PrintJob printJob) {
        Log.d("myprinter", "queued: " + printJob.getId().toString());

        printJob.start();

        final PrintDocument document = printJob.getDocument();

        final FileInputStream in = new FileInputStream(document.getData().getFileDescriptor());
        try {
            final byte[] buffer = new byte[4];
            @SuppressWarnings("unused")
            final int read = in.read(buffer);
            Log.d("myprinter", "first " + buffer.length + "bytes of content: " + toString(buffer));
        } catch (IOException e) {
            Log.d("myprinter", "", e);
        } finally {
            try {
                in.close();
            } catch (IOException e) {
                assert true;
            }
        }
        printJob.complete();
    }

    private static String toString(byte[] bytes) {
        final StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(Byte.toString(b)).append(',');
        }
        if (sb.length() != 0) {
            sb.setLength(sb.length() - 1);
        }
        return sb.toString();
    }

    @Override
    protected void onRequestCancelPrintJob(PrintJob printJob) {
        Log.d("myprinter", "canceled: " + printJob.getId().toString());

        printJob.cancel();
    }

}