/*
* Copyright (C) 2013 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 android.print;
import android.app.Activity;
import android.app.Application.ActivityLifecycleCallbacks;
import android.content.Context;
import android.content.IntentSender;
import android.content.IntentSender.SendIntentException;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.Handler;
import android.os.ICancellationSignal;
import android.os.Looper;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.print.PrintDocumentAdapter.LayoutResultCallback;
import android.print.PrintDocumentAdapter.WriteResultCallback;
import android.printservice.PrintServiceInfo;
import android.text.TextUtils;
import android.util.ArrayMap;
import android.util.Log;
import com.android.internal.os.SomeArgs;
import libcore.io.IoUtils;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* System level service for accessing the printing capabilities of the platform.
* <p>
* To obtain a handle to the print manager do the following:
* </p>
*
* <pre>
* PrintManager printManager =
* (PrintManager) context.getSystemService(Context.PRINT_SERVICE);
* </pre>
*
* <h3>Print mechanics</h3>
* <p>
* The key idea behind printing on the platform is that the content to be printed
* should be laid out for the currently selected print options resulting in an
* optimized output and higher user satisfaction. To achieve this goal the platform
* declares a contract that the printing application has to follow which is defined
* by the {@link PrintDocumentAdapter} class. At a higher level the contract is that
* when the user selects some options from the print UI that may affect the way
* content is laid out, for example page size, the application receives a callback
* allowing it to layout the content to better fit these new constraints. After a
* layout pass the system may ask the application to render one or more pages one
* or more times. For example, an application may produce a single column list for
* smaller page sizes and a multi-column table for larger page sizes.
* </p>
* <h3>Print jobs</h3>
* <p>
* Print jobs are started by calling the {@link #print(String, PrintDocumentAdapter,
* PrintAttributes)} from an activity which results in bringing up the system print
* UI. Once the print UI is up, when the user changes a selected print option that
* affects the way content is laid out the system starts to interact with the
* application following the mechanics described the section above.
* </p>
* <p>
* Print jobs can be in {@link PrintJobInfo#STATE_CREATED created}, {@link
* PrintJobInfo#STATE_QUEUED queued}, {@link PrintJobInfo#STATE_STARTED started},
* {@link PrintJobInfo#STATE_BLOCKED blocked}, {@link PrintJobInfo#STATE_COMPLETED
* completed}, {@link PrintJobInfo#STATE_FAILED failed}, and {@link
* PrintJobInfo#STATE_CANCELED canceled} state. Print jobs are stored in dedicated
* system spooler until they are handled which is they are cancelled or completed.
* Active print jobs, ones that are not cancelled or completed, are considered failed
* if the device reboots as the new boot may be after a very long time. The user may
* choose to restart such print jobs. Once a print job is queued all relevant content
* is stored in the system spooler and its lifecycle becomes detached from this of
* the application that created it.
* </p>
* <p>
* An applications can query the print spooler for current print jobs it created
* but not print jobs created by other applications.
* </p>
*
* @see PrintJob
* @see PrintJobInfo
*/
public final class PrintManager {
private static final String LOG_TAG = "PrintManager";
private static final boolean DEBUG = false;
private static final int MSG_NOTIFY_PRINT_JOB_STATE_CHANGED = 1;
/**
* The action for launching the print dialog activity.
*
* @hide
*/
public static final String ACTION_PRINT_DIALOG = "android.print.PRINT_DIALOG";
/**
* Extra with the intent for starting the print dialog.
* <p>
* <strong>Type:</strong> {@link android.content.IntentSender}
* </p>
*
* @hide
*/
public static final String EXTRA_PRINT_DIALOG_INTENT =
"android.print.intent.extra.EXTRA_PRINT_DIALOG_INTENT";
/**
* Extra with a print job.
* <p>
* <strong>Type:</strong> {@link android.print.PrintJobInfo}
* </p>
*
* @hide
*/
public static final String EXTRA_PRINT_JOB =
"android.print.intent.extra.EXTRA_PRINT_JOB";
/**
* Extra with the print document adapter to be printed.
* <p>
* <strong>Type:</strong> {@link android.print.IPrintDocumentAdapter}
* </p>
*
* @hide
*/
public static final String EXTRA_PRINT_DOCUMENT_ADAPTER =
"android.print.intent.extra.EXTRA_PRINT_DOCUMENT_ADAPTER";
/** @hide */
public static final int APP_ID_ANY = -2;
private final Context mContext;
private final IPrintManager mService;
private final int mUserId;
private final int mAppId;
private final Handler mHandler;
private Map<PrintJobStateChangeListener, PrintJobStateChangeListenerWrapper> mPrintJobStateChangeListeners;
/** @hide */
public interface PrintJobStateChangeListener {
/**
* Callback notifying that a print job state changed.
*
* @param printJobId The print job id.
*/
public void onPrintJobStateChanged(PrintJobId printJobId);
}
/**
* Creates a new instance.
*
* @param context The current context in which to operate.
* @param service The backing system service.
* @hide
*/
public PrintManager(Context context, IPrintManager service, int userId, int appId) {
mContext = context;
mService = service;
mUserId = userId;
mAppId = appId;
mHandler = new Handler(context.getMainLooper(), null, false) {
@Override
public void handleMessage(Message message) {
switch (message.what) {
case MSG_NOTIFY_PRINT_JOB_STATE_CHANGED: {
SomeArgs args = (SomeArgs) message.obj;
PrintJobStateChangeListenerWrapper wrapper =
(PrintJobStateChangeListenerWrapper) args.arg1;
PrintJobStateChangeListener listener = wrapper.getListener();
if (listener != null) {
PrintJobId printJobId = (PrintJobId) args.arg2;
listener.onPrintJobStateChanged(printJobId);
}
args.recycle();
} break;
}
}
};
}
/**
* Creates an instance that can access all print jobs.
*
* @param userId The user id for which to get all print jobs.
* @return An instance if the caller has the permission to access all print
* jobs, null otherwise.
* @hide
*/
public PrintManager getGlobalPrintManagerForUser(int userId) {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return null;
}
return new PrintManager(mContext, mService, userId, APP_ID_ANY);
}
PrintJobInfo getPrintJobInfo(PrintJobId printJobId) {
try {
return mService.getPrintJobInfo(printJobId, mAppId, mUserId);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error getting a print job info:" + printJobId, re);
}
return null;
}
/**
* Adds a listener for observing the state of print jobs.
*
* @param listener The listener to add.
* @hide
*/
public void addPrintJobStateChangeListener(PrintJobStateChangeListener listener) {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return;
}
if (mPrintJobStateChangeListeners == null) {
mPrintJobStateChangeListeners = new ArrayMap<PrintJobStateChangeListener,
PrintJobStateChangeListenerWrapper>();
}
PrintJobStateChangeListenerWrapper wrappedListener =
new PrintJobStateChangeListenerWrapper(listener, mHandler);
try {
mService.addPrintJobStateChangeListener(wrappedListener, mAppId, mUserId);
mPrintJobStateChangeListeners.put(listener, wrappedListener);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error adding print job state change listener", re);
}
}
/**
* Removes a listener for observing the state of print jobs.
*
* @param listener The listener to remove.
* @hide
*/
public void removePrintJobStateChangeListener(PrintJobStateChangeListener listener) {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return;
}
if (mPrintJobStateChangeListeners == null) {
return;
}
PrintJobStateChangeListenerWrapper wrappedListener =
mPrintJobStateChangeListeners.remove(listener);
if (wrappedListener == null) {
return;
}
if (mPrintJobStateChangeListeners.isEmpty()) {
mPrintJobStateChangeListeners = null;
}
wrappedListener.destroy();
try {
mService.removePrintJobStateChangeListener(wrappedListener, mUserId);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error removing print job state change listener", re);
}
}
/**
* Gets a print job given its id.
*
* @return The print job list.
* @see PrintJob
* @hide
*/
public PrintJob getPrintJob(PrintJobId printJobId) {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return null;
}
try {
PrintJobInfo printJob = mService.getPrintJobInfo(printJobId, mAppId, mUserId);
if (printJob != null) {
return new PrintJob(printJob, this);
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error getting print job", re);
}
return null;
}
/**
* Gets the print jobs for this application.
*
* @return The print job list.
* @see PrintJob
*/
public List<PrintJob> getPrintJobs() {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return Collections.emptyList();
}
try {
List<PrintJobInfo> printJobInfos = mService.getPrintJobInfos(mAppId, mUserId);
if (printJobInfos == null) {
return Collections.emptyList();
}
final int printJobCount = printJobInfos.size();
List<PrintJob> printJobs = new ArrayList<PrintJob>(printJobCount);
for (int i = 0; i < printJobCount; i++) {
printJobs.add(new PrintJob(printJobInfos.get(i), this));
}
return printJobs;
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error getting print jobs", re);
}
return Collections.emptyList();
}
void cancelPrintJob(PrintJobId printJobId) {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return;
}
try {
mService.cancelPrintJob(printJobId, mAppId, mUserId);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error canceling a print job: " + printJobId, re);
}
}
void restartPrintJob(PrintJobId printJobId) {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return;
}
try {
mService.restartPrintJob(printJobId, mAppId, mUserId);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error restarting a print job: " + printJobId, re);
}
}
/**
* Creates a print job for printing a {@link PrintDocumentAdapter} with
* default print attributes.
* <p>
* Calling this method brings the print UI allowing the user to customize
* the print job and returns a {@link PrintJob} object without waiting for the
* user to customize or confirm the print job. The returned print job instance
* is in a {@link PrintJobInfo#STATE_CREATED created} state.
* <p>
* This method can be called only from an {@link Activity}. The rationale is that
* printing from a service will create an inconsistent user experience as the print
* UI would appear without any context.
* </p>
* <p>
* Also the passed in {@link PrintDocumentAdapter} will be considered invalid if
* your activity is finished. The rationale is that once the activity that
* initiated printing is finished, the provided adapter may be in an inconsistent
* state as it may depend on the UI presented by the activity.
* </p>
* <p>
* The default print attributes are a hint to the system how the data is to
* be printed. For example, a photo editor may look at the photo aspect ratio
* to determine the default orientation and provide a hint whether the printing
* should be in portrait or landscape. The system will do a best effort to
* selected the hinted options in the print dialog, given the current printer
* supports them.
* </p>
* <p>
* <strong>Note:</strong> Calling this method will bring the print dialog and
* the system will connect to the provided {@link PrintDocumentAdapter}. If a
* configuration change occurs that you application does not handle, for example
* a rotation change, the system will drop the connection to the adapter as the
* activity has to be recreated and the old adapter may be invalid in this context,
* hence a new adapter instance is required. As a consequence, if your activity
* does not handle configuration changes (default behavior), you have to save the
* state that you were printing and call this method again when your activity
* is recreated.
* </p>
*
* @param printJobName A name for the new print job which is shown to the user.
* @param documentAdapter An adapter that emits the document to print.
* @param attributes The default print job attributes or <code>null</code>.
* @return The created print job on success or null on failure.
* @throws IllegalStateException If not called from an {@link Activity}.
* @throws IllegalArgumentException If the print job name is empty or the
* document adapter is null.
*
* @see PrintJob
*/
public PrintJob print(String printJobName, PrintDocumentAdapter documentAdapter,
PrintAttributes attributes) {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return null;
}
if (!(mContext instanceof Activity)) {
throw new IllegalStateException("Can print only from an activity");
}
if (TextUtils.isEmpty(printJobName)) {
throw new IllegalArgumentException("printJobName cannot be empty");
}
if (documentAdapter == null) {
throw new IllegalArgumentException("documentAdapter cannot be null");
}
PrintDocumentAdapterDelegate delegate = new PrintDocumentAdapterDelegate(
(Activity) mContext, documentAdapter);
try {
Bundle result = mService.print(printJobName, delegate,
attributes, mContext.getPackageName(), mAppId, mUserId);
if (result != null) {
PrintJobInfo printJob = result.getParcelable(EXTRA_PRINT_JOB);
IntentSender intent = result.getParcelable(EXTRA_PRINT_DIALOG_INTENT);
if (printJob == null || intent == null) {
return null;
}
try {
mContext.startIntentSender(intent, null, 0, 0, 0);
return new PrintJob(printJob, this);
} catch (SendIntentException sie) {
Log.e(LOG_TAG, "Couldn't start print job config activity.", sie);
}
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error creating a print job", re);
}
return null;
}
/**
* Gets the list of enabled print services.
*
* @return The enabled service list or an empty list.
* @hide
*/
public List<PrintServiceInfo> getEnabledPrintServices() {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return Collections.emptyList();
}
try {
List<PrintServiceInfo> enabledServices = mService.getEnabledPrintServices(mUserId);
if (enabledServices != null) {
return enabledServices;
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error getting the enabled print services", re);
}
return Collections.emptyList();
}
/**
* Gets the list of installed print services.
*
* @return The installed service list or an empty list.
* @hide
*/
public List<PrintServiceInfo> getInstalledPrintServices() {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return Collections.emptyList();
}
try {
List<PrintServiceInfo> installedServices = mService.getInstalledPrintServices(mUserId);
if (installedServices != null) {
return installedServices;
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error getting the installed print services", re);
}
return Collections.emptyList();
}
/**
* @hide
*/
public PrinterDiscoverySession createPrinterDiscoverySession() {
if (mService == null) {
Log.w(LOG_TAG, "Feature android.software.print not available");
return null;
}
return new PrinterDiscoverySession(mService, mContext, mUserId);
}
private static final class PrintDocumentAdapterDelegate extends IPrintDocumentAdapter.Stub
implements ActivityLifecycleCallbacks {
private final Object mLock = new Object();
private Activity mActivity; // Strong reference OK - cleared in destroy
private PrintDocumentAdapter mDocumentAdapter; // Strong reference OK - cleared in destroy
private Handler mHandler; // Strong reference OK - cleared in destroy
private IPrintDocumentAdapterObserver mObserver; // Strong reference OK - cleared in destroy
private DestroyableCallback mPendingCallback;
public PrintDocumentAdapterDelegate(Activity activity,
PrintDocumentAdapter documentAdapter) {
mActivity = activity;
mDocumentAdapter = documentAdapter;
mHandler = new MyHandler(mActivity.getMainLooper());
mActivity.getApplication().registerActivityLifecycleCallbacks(this);
}
@Override
public void setObserver(IPrintDocumentAdapterObserver observer) {
final boolean destroyed;
synchronized (mLock) {
mObserver = observer;
destroyed = isDestroyedLocked();
}
if (destroyed && observer != null) {
try {
observer.onDestroy();
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error announcing destroyed state", re);
}
}
}
@Override
public void start() {
synchronized (mLock) {
// If destroyed the handler is null.
if (!isDestroyedLocked()) {
mHandler.obtainMessage(MyHandler.MSG_ON_START,
mDocumentAdapter).sendToTarget();
}
}
}
@Override
public void layout(PrintAttributes oldAttributes, PrintAttributes newAttributes,
ILayoutResultCallback callback, Bundle metadata, int sequence) {
ICancellationSignal cancellationTransport = CancellationSignal.createTransport();
try {
callback.onLayoutStarted(cancellationTransport, sequence);
} catch (RemoteException re) {
// The spooler is dead - can't recover.
Log.e(LOG_TAG, "Error notifying for layout start", re);
return;
}
synchronized (mLock) {
// If destroyed the handler is null.
if (isDestroyedLocked()) {
return;
}
CancellationSignal cancellationSignal = CancellationSignal.fromTransport(
cancellationTransport);
SomeArgs args = SomeArgs.obtain();
args.arg1 = mDocumentAdapter;
args.arg2 = oldAttributes;
args.arg3 = newAttributes;
args.arg4 = cancellationSignal;
args.arg5 = new MyLayoutResultCallback(callback, sequence);
args.arg6 = metadata;
mHandler.obtainMessage(MyHandler.MSG_ON_LAYOUT, args).sendToTarget();
}
}
@Override
public void write(PageRange[] pages, ParcelFileDescriptor fd,
IWriteResultCallback callback, int sequence) {
ICancellationSignal cancellationTransport = CancellationSignal.createTransport();
try {
callback.onWriteStarted(cancellationTransport, sequence);
} catch (RemoteException re) {
// The spooler is dead - can't recover.
Log.e(LOG_TAG, "Error notifying for write start", re);
return;
}
synchronized (mLock) {
// If destroyed the handler is null.
if (isDestroyedLocked()) {
return;
}
CancellationSignal cancellationSignal = CancellationSignal.fromTransport(
cancellationTransport);
SomeArgs args = SomeArgs.obtain();
args.arg1 = mDocumentAdapter;
args.arg2 = pages;
args.arg3 = fd;
args.arg4 = cancellationSignal;
args.arg5 = new MyWriteResultCallback(callback, fd, sequence);
mHandler.obtainMessage(MyHandler.MSG_ON_WRITE, args).sendToTarget();
}
}
@Override
public void finish() {
synchronized (mLock) {
// If destroyed the handler is null.
if (!isDestroyedLocked()) {
mHandler.obtainMessage(MyHandler.MSG_ON_FINISH,
mDocumentAdapter).sendToTarget();
}
}
}
@Override
public void kill(String reason) {
synchronized (mLock) {
// If destroyed the handler is null.
if (!isDestroyedLocked()) {
mHandler.obtainMessage(MyHandler.MSG_ON_KILL,
reason).sendToTarget();
}
}
}
@Override
public void onActivityPaused(Activity activity) {
/* do nothing */
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
/* do nothing */
}
@Override
public void onActivityStarted(Activity activity) {
/* do nothing */
}
@Override
public void onActivityResumed(Activity activity) {
/* do nothing */
}
@Override
public void onActivityStopped(Activity activity) {
/* do nothing */
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
/* do nothing */
}
@Override
public void onActivityDestroyed(Activity activity) {
// We really care only if the activity is being destroyed to
// notify the the print spooler so it can close the print dialog.
// Note the the spooler has a death recipient that observes if
// this process gets killed so we cover the case of onDestroy not
// being called due to this process being killed to reclaim memory.
IPrintDocumentAdapterObserver observer = null;
synchronized (mLock) {
if (activity == mActivity) {
observer = mObserver;
destroyLocked();
}
}
if (observer != null) {
try {
observer.onDestroy();
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error announcing destroyed state", re);
}
}
}
private boolean isDestroyedLocked() {
return (mActivity == null);
}
private void destroyLocked() {
mActivity.getApplication().unregisterActivityLifecycleCallbacks(
PrintDocumentAdapterDelegate.this);
mActivity = null;
mDocumentAdapter = null;
// This method is only called from the main thread, so
// clearing the messages guarantees that any time a
// message is handled we are not in a destroyed state.
mHandler.removeMessages(MyHandler.MSG_ON_START);
mHandler.removeMessages(MyHandler.MSG_ON_LAYOUT);
mHandler.removeMessages(MyHandler.MSG_ON_WRITE);
mHandler.removeMessages(MyHandler.MSG_ON_FINISH);
mHandler = null;
mObserver = null;
if (mPendingCallback != null) {
mPendingCallback.destroy();
mPendingCallback = null;
}
}
private final class MyHandler extends Handler {
public static final int MSG_ON_START = 1;
public static final int MSG_ON_LAYOUT = 2;
public static final int MSG_ON_WRITE = 3;
public static final int MSG_ON_FINISH = 4;
public static final int MSG_ON_KILL = 5;
public MyHandler(Looper looper) {
super(looper, null, true);
}
@Override
public void handleMessage(Message message) {
switch (message.what) {
case MSG_ON_START: {
if (DEBUG) {
Log.i(LOG_TAG, "onStart()");
}
((PrintDocumentAdapter) message.obj).onStart();
} break;
case MSG_ON_LAYOUT: {
SomeArgs args = (SomeArgs) message.obj;
PrintDocumentAdapter adapter = (PrintDocumentAdapter) args.arg1;
PrintAttributes oldAttributes = (PrintAttributes) args.arg2;
PrintAttributes newAttributes = (PrintAttributes) args.arg3;
CancellationSignal cancellation = (CancellationSignal) args.arg4;
LayoutResultCallback callback = (LayoutResultCallback) args.arg5;
Bundle metadata = (Bundle) args.arg6;
args.recycle();
if (DEBUG) {
StringBuilder builder = new StringBuilder();
builder.append("PrintDocumentAdapter#onLayout() {\n");
builder.append("\n oldAttributes:").append(oldAttributes);
builder.append("\n newAttributes:").append(newAttributes);
builder.append("\n preview:").append(metadata.getBoolean(
PrintDocumentAdapter.EXTRA_PRINT_PREVIEW));
builder.append("\n}");
Log.i(LOG_TAG, builder.toString());
}
adapter.onLayout(oldAttributes, newAttributes, cancellation,
callback, metadata);
} break;
case MSG_ON_WRITE: {
SomeArgs args = (SomeArgs) message.obj;
PrintDocumentAdapter adapter = (PrintDocumentAdapter) args.arg1;
PageRange[] pages = (PageRange[]) args.arg2;
ParcelFileDescriptor fd = (ParcelFileDescriptor) args.arg3;
CancellationSignal cancellation = (CancellationSignal) args.arg4;
WriteResultCallback callback = (WriteResultCallback) args.arg5;
args.recycle();
if (DEBUG) {
StringBuilder builder = new StringBuilder();
builder.append("PrintDocumentAdapter#onWrite() {\n");
builder.append("\n pages:").append(Arrays.toString(pages));
builder.append("\n}");
Log.i(LOG_TAG, builder.toString());
}
adapter.onWrite(pages, fd, cancellation, callback);
} break;
case MSG_ON_FINISH: {
if (DEBUG) {
Log.i(LOG_TAG, "onFinish()");
}
((PrintDocumentAdapter) message.obj).onFinish();
// Done printing, so destroy this instance as it
// should not be used anymore.
synchronized (mLock) {
destroyLocked();
}
} break;
case MSG_ON_KILL: {
if (DEBUG) {
Log.i(LOG_TAG, "onKill()");
}
String reason = (String) message.obj;
throw new RuntimeException(reason);
}
default: {
throw new IllegalArgumentException("Unknown message: "
+ message.what);
}
}
}
}
private interface DestroyableCallback {
public void destroy();
}
private final class MyLayoutResultCallback extends LayoutResultCallback
implements DestroyableCallback {
private ILayoutResultCallback mCallback;
private final int mSequence;
public MyLayoutResultCallback(ILayoutResultCallback callback,
int sequence) {
mCallback = callback;
mSequence = sequence;
}
@Override
public void onLayoutFinished(PrintDocumentInfo info, boolean changed) {
final ILayoutResultCallback callback;
synchronized (mLock) {
callback = mCallback;
}
// If the callback is null we are destroyed.
if (callback == null) {
Log.e(LOG_TAG, "PrintDocumentAdapter is destroyed. Did you "
+ "finish the printing activity before print completion "
+ "or did you invoke a callback after finish?");
return;
}
try {
if (info == null) {
throw new NullPointerException("document info cannot be null");
}
try {
callback.onLayoutFinished(info, changed, mSequence);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error calling onLayoutFinished", re);
}
} finally {
destroy();
}
}
@Override
public void onLayoutFailed(CharSequence error) {
final ILayoutResultCallback callback;
synchronized (mLock) {
callback = mCallback;
}
// If the callback is null we are destroyed.
if (callback == null) {
Log.e(LOG_TAG, "PrintDocumentAdapter is destroyed. Did you "
+ "finish the printing activity before print completion "
+ "or did you invoke a callback after finish?");
return;
}
try {
callback.onLayoutFailed(error, mSequence);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error calling onLayoutFailed", re);
} finally {
destroy();
}
}
@Override
public void onLayoutCancelled() {
final ILayoutResultCallback callback;
synchronized (mLock) {
callback = mCallback;
}
// If the callback is null we are destroyed.
if (callback == null) {
Log.e(LOG_TAG, "PrintDocumentAdapter is destroyed. Did you "
+ "finish the printing activity before print completion "
+ "or did you invoke a callback after finish?");
return;
}
try {
callback.onLayoutCanceled(mSequence);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error calling onLayoutFailed", re);
} finally {
destroy();
}
}
@Override
public void destroy() {
synchronized (mLock) {
mCallback = null;
mPendingCallback = null;
}
}
}
private final class MyWriteResultCallback extends WriteResultCallback
implements DestroyableCallback {
private ParcelFileDescriptor mFd;
private IWriteResultCallback mCallback;
private final int mSequence;
public MyWriteResultCallback(IWriteResultCallback callback,
ParcelFileDescriptor fd, int sequence) {
mFd = fd;
mSequence = sequence;
mCallback = callback;
}
@Override
public void onWriteFinished(PageRange[] pages) {
final IWriteResultCallback callback;
synchronized (mLock) {
callback = mCallback;
}
// If the callback is null we are destroyed.
if (callback == null) {
Log.e(LOG_TAG, "PrintDocumentAdapter is destroyed. Did you "
+ "finish the printing activity before print completion "
+ "or did you invoke a callback after finish?");
return;
}
try {
if (pages == null) {
throw new IllegalArgumentException("pages cannot be null");
}
if (pages.length == 0) {
throw new IllegalArgumentException("pages cannot be empty");
}
try {
callback.onWriteFinished(pages, mSequence);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error calling onWriteFinished", re);
}
} finally {
destroy();
}
}
@Override
public void onWriteFailed(CharSequence error) {
final IWriteResultCallback callback;
synchronized (mLock) {
callback = mCallback;
}
// If the callback is null we are destroyed.
if (callback == null) {
Log.e(LOG_TAG, "PrintDocumentAdapter is destroyed. Did you "
+ "finish the printing activity before print completion "
+ "or did you invoke a callback after finish?");
return;
}
try {
callback.onWriteFailed(error, mSequence);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error calling onWriteFailed", re);
} finally {
destroy();
}
}
@Override
public void onWriteCancelled() {
final IWriteResultCallback callback;
synchronized (mLock) {
callback = mCallback;
}
// If the callback is null we are destroyed.
if (callback == null) {
Log.e(LOG_TAG, "PrintDocumentAdapter is destroyed. Did you "
+ "finish the printing activity before print completion "
+ "or did you invoke a callback after finish?");
return;
}
try {
callback.onWriteCanceled(mSequence);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error calling onWriteCanceled", re);
} finally {
destroy();
}
}
@Override
public void destroy() {
synchronized (mLock) {
IoUtils.closeQuietly(mFd);
mCallback = null;
mFd = null;
mPendingCallback = null;
}
}
}
}
private static final class PrintJobStateChangeListenerWrapper extends
IPrintJobStateChangeListener.Stub {
private final WeakReference<PrintJobStateChangeListener> mWeakListener;
private final WeakReference<Handler> mWeakHandler;
public PrintJobStateChangeListenerWrapper(PrintJobStateChangeListener listener,
Handler handler) {
mWeakListener = new WeakReference<PrintJobStateChangeListener>(listener);
mWeakHandler = new WeakReference<Handler>(handler);
}
@Override
public void onPrintJobStateChanged(PrintJobId printJobId) {
Handler handler = mWeakHandler.get();
PrintJobStateChangeListener listener = mWeakListener.get();
if (handler != null && listener != null) {
SomeArgs args = SomeArgs.obtain();
args.arg1 = this;
args.arg2 = printJobId;
handler.obtainMessage(MSG_NOTIFY_PRINT_JOB_STATE_CHANGED,
args).sendToTarget();
}
}
public void destroy() {
mWeakListener.clear();
}
public PrintJobStateChangeListener getListener() {
return mWeakListener.get();
}
}
}