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Android example source code file (PendingIntent.java)

This example Android source code file (PendingIntent.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, bundle, canceledexception, content, finisheddispatcher, handler, ibinder, iintentsender, intent, onfinished, os, override, parcelable, pendingintent, remoteexception, string, stringbuilder, util, utilities, utils

The PendingIntent.java Android example source code

/*
 * Copyright (C) 2006 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.app;

import android.content.Context;
import android.content.Intent;
import android.content.IIntentReceiver;
import android.content.IIntentSender;
import android.content.IntentSender;
import android.os.Bundle;
import android.os.RemoteException;
import android.os.Handler;
import android.os.IBinder;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AndroidException;

/**
 * A description of an Intent and target action to perform with it.  Instances
 * of this class are created with {@link #getActivity},
 * {@link #getBroadcast}, {@link #getService}; the returned object can be
 * handed to other applications so that they can perform the action you
 * described on your behalf at a later time.
 *
 * <p>By giving a PendingIntent to another application,
 * you are granting it the right to perform the operation you have specified
 * as if the other application was yourself (with the same permissions and
 * identity).  As such, you should be careful about how you build the PendingIntent:
 * often, for example, the base Intent you supply will have the component
 * name explicitly set to one of your own components, to ensure it is ultimately
 * sent there and nowhere else.
 *
 * <p>A PendingIntent itself is simply a reference to a token maintained by
 * the system describing the original data used to retrieve it.  This means
 * that, even if its owning application's process is killed, the
 * PendingIntent itself will remain usable from other processes that
 * have been given it.  If the creating application later re-retrieves the
 * same kind of PendingIntent (same operation, same Intent action, data,
 * categories, and components, and same flags), it will receive a PendingIntent
 * representing the same token if that is still valid, and can thus call
 * {@link #cancel} to remove it.
 */
public final class PendingIntent implements Parcelable {
    private final IIntentSender mTarget;

    /**
     * Flag for use with {@link #getActivity}, {@link #getBroadcast}, and
     * {@link #getService}: this
     * PendingIntent can only be used once.  If set, after
     * {@link #send()} is called on it, it will be automatically
     * canceled for you and any future attempt to send through it will fail.
     */
    public static final int FLAG_ONE_SHOT = 1<<30;
    /**
     * Flag for use with {@link #getActivity}, {@link #getBroadcast}, and
     * {@link #getService}: if the described PendingIntent does not already
     * exist, then simply return null instead of creating it.
     */
    public static final int FLAG_NO_CREATE = 1<<29;
    /**
     * Flag for use with {@link #getActivity}, {@link #getBroadcast}, and
     * {@link #getService}: if the described PendingIntent already exists,
     * the current one is canceled before generating a new one.  You can use
     * this to retrieve a new PendingIntent when you are only changing the
     * extra data in the Intent; by canceling the previous pending intent,
     * this ensures that only entities given the new data will be able to
     * launch it.  If this assurance is not an issue, consider
     * {@link #FLAG_UPDATE_CURRENT}.
     */
    public static final int FLAG_CANCEL_CURRENT = 1<<28;
    /**
     * Flag for use with {@link #getActivity}, {@link #getBroadcast}, and
     * {@link #getService}: if the described PendingIntent already exists,
     * then keep it but its replace its extra data with what is in this new
     * Intent.  This can be used if you are creating intents where only the
     * extras change, and don't care that any entities that received your
     * previous PendingIntent will be able to launch it with your new
     * extras even if they are not explicitly given to it.
     */
    public static final int FLAG_UPDATE_CURRENT = 1<<27;

    /**
     * Exception thrown when trying to send through a PendingIntent that
     * has been canceled or is otherwise no longer able to execute the request.
     */
    public static class CanceledException extends AndroidException {
        public CanceledException() {
        }

        public CanceledException(String name) {
            super(name);
        }

        public CanceledException(Exception cause) {
            super(cause);
        }
    }

    /**
     * Callback interface for discovering when a send operation has
     * completed.  Primarily for use with a PendingIntent that is
     * performing a broadcast, this provides the same information as
     * calling {@link Context#sendOrderedBroadcast(Intent, String,
     * android.content.BroadcastReceiver, Handler, int, String, Bundle)
     * Context.sendBroadcast()} with a final BroadcastReceiver.
     */
    public interface OnFinished {
        /**
         * Called when a send operation as completed.
         *
         * @param pendingIntent The PendingIntent this operation was sent through.
         * @param intent The original Intent that was sent.
         * @param resultCode The final result code determined by the send.
         * @param resultData The final data collected by a broadcast.
         * @param resultExtras The final extras collected by a broadcast.
         */
        void onSendFinished(PendingIntent pendingIntent, Intent intent,
                int resultCode, String resultData, Bundle resultExtras);
    }

    private static class FinishedDispatcher extends IIntentReceiver.Stub
            implements Runnable {
        private final PendingIntent mPendingIntent;
        private final OnFinished mWho;
        private final Handler mHandler;
        private Intent mIntent;
        private int mResultCode;
        private String mResultData;
        private Bundle mResultExtras;
        FinishedDispatcher(PendingIntent pi, OnFinished who, Handler handler) {
            mPendingIntent = pi;
            mWho = who;
            mHandler = handler;
        }
        public void performReceive(Intent intent, int resultCode,
                String data, Bundle extras, boolean serialized, boolean sticky) {
            mIntent = intent;
            mResultCode = resultCode;
            mResultData = data;
            mResultExtras = extras;
            if (mHandler == null) {
                run();
            } else {
                mHandler.post(this);
            }
        }
        public void run() {
            mWho.onSendFinished(mPendingIntent, mIntent, mResultCode,
                    mResultData, mResultExtras);
        }
    }

    /**
     * Retrieve a PendingIntent that will start a new activity, like calling
     * {@link Context#startActivity(Intent) Context.startActivity(Intent)}.
     * Note that the activity will be started outside of the context of an
     * existing activity, so you must use the {@link Intent#FLAG_ACTIVITY_NEW_TASK
     * Intent.FLAG_ACTIVITY_NEW_TASK} launch flag in the Intent.
     *
     * @param context The Context in which this PendingIntent should start
     * the activity.
     * @param requestCode Private request code for the sender (currently
     * not used).
     * @param intent Intent of the activity to be launched.
     * @param flags May be {@link #FLAG_ONE_SHOT}, {@link #FLAG_NO_CREATE},
     * {@link #FLAG_CANCEL_CURRENT}, {@link #FLAG_UPDATE_CURRENT},
     * or any of the flags as supported by
     * {@link Intent#fillIn Intent.fillIn()} to control which unspecified parts
     * of the intent that can be supplied when the actual send happens.
     *
     * @return Returns an existing or new PendingIntent matching the given
     * parameters.  May return null only if {@link #FLAG_NO_CREATE} has been
     * supplied.
     */
    public static PendingIntent getActivity(Context context, int requestCode,
            Intent intent, int flags) {
        String packageName = context.getPackageName();
        String resolvedType = intent != null ? intent.resolveTypeIfNeeded(
                context.getContentResolver()) : null;
        try {
            IIntentSender target =
                ActivityManagerNative.getDefault().getIntentSender(
                    IActivityManager.INTENT_SENDER_ACTIVITY, packageName,
                    null, null, requestCode, intent, resolvedType, flags);
            return target != null ? new PendingIntent(target) : null;
        } catch (RemoteException e) {
        }
        return null;
    }

    /**
     * Retrieve a PendingIntent that will perform a broadcast, like calling
     * {@link Context#sendBroadcast(Intent) Context.sendBroadcast()}.
     *
     * @param context The Context in which this PendingIntent should perform
     * the broadcast.
     * @param requestCode Private request code for the sender (currently
     * not used).
     * @param intent The Intent to be broadcast.
     * @param flags May be {@link #FLAG_ONE_SHOT}, {@link #FLAG_NO_CREATE},
     * {@link #FLAG_CANCEL_CURRENT}, {@link #FLAG_UPDATE_CURRENT},
     * or any of the flags as supported by
     * {@link Intent#fillIn Intent.fillIn()} to control which unspecified parts
     * of the intent that can be supplied when the actual send happens.
     *
     * @return Returns an existing or new PendingIntent matching the given
     * parameters.  May return null only if {@link #FLAG_NO_CREATE} has been
     * supplied.
     */
    public static PendingIntent getBroadcast(Context context, int requestCode,
            Intent intent, int flags) {
        String packageName = context.getPackageName();
        String resolvedType = intent != null ? intent.resolveTypeIfNeeded(
                context.getContentResolver()) : null;
        try {
            IIntentSender target =
                ActivityManagerNative.getDefault().getIntentSender(
                    IActivityManager.INTENT_SENDER_BROADCAST, packageName,
                    null, null, requestCode, intent, resolvedType, flags);
            return target != null ? new PendingIntent(target) : null;
        } catch (RemoteException e) {
        }
        return null;
    }

    /**
     * Retrieve a PendingIntent that will start a service, like calling
     * {@link Context#startService Context.startService()}.  The start
     * arguments given to the service will come from the extras of the Intent.
     *
     * @param context The Context in which this PendingIntent should start
     * the service.
     * @param requestCode Private request code for the sender (currently
     * not used).
     * @param intent An Intent describing the service to be started.
     * @param flags May be {@link #FLAG_ONE_SHOT}, {@link #FLAG_NO_CREATE},
     * {@link #FLAG_CANCEL_CURRENT}, {@link #FLAG_UPDATE_CURRENT},
     * or any of the flags as supported by
     * {@link Intent#fillIn Intent.fillIn()} to control which unspecified parts
     * of the intent that can be supplied when the actual send happens.
     *
     * @return Returns an existing or new PendingIntent matching the given
     * parameters.  May return null only if {@link #FLAG_NO_CREATE} has been
     * supplied.
     */
    public static PendingIntent getService(Context context, int requestCode,
            Intent intent, int flags) {
        String packageName = context.getPackageName();
        String resolvedType = intent != null ? intent.resolveTypeIfNeeded(
                context.getContentResolver()) : null;
        try {
            IIntentSender target =
                ActivityManagerNative.getDefault().getIntentSender(
                    IActivityManager.INTENT_SENDER_SERVICE, packageName,
                    null, null, requestCode, intent, resolvedType, flags);
            return target != null ? new PendingIntent(target) : null;
        } catch (RemoteException e) {
        }
        return null;
    }

    /**
     * Retrieve a IntentSender object that wraps the existing sender of the PendingIntent
     *
     * @return Returns a IntentSender object that wraps the sender of PendingIntent
     *
     */
    public IntentSender getIntentSender() {
        return new IntentSender(mTarget);
    }

    /**
     * Cancel a currently active PendingIntent.  Only the original application
     * owning an PendingIntent can cancel it.
     */
    public void cancel() {
        try {
            ActivityManagerNative.getDefault().cancelIntentSender(mTarget);
        } catch (RemoteException e) {
        }
    }

    /**
     * Perform the operation associated with this PendingIntent.
     *
     * @see #send(Context, int, Intent, android.app.PendingIntent.OnFinished, Handler)
     *
     * @throws CanceledException Throws CanceledException if the PendingIntent
     * is no longer allowing more intents to be sent through it.
     */
    public void send() throws CanceledException {
        send(null, 0, null, null, null);
    }

    /**
     * Perform the operation associated with this PendingIntent.
     *
     * @param code Result code to supply back to the PendingIntent's target.
     *
     * @see #send(Context, int, Intent, android.app.PendingIntent.OnFinished, Handler)
     *
     * @throws CanceledException Throws CanceledException if the PendingIntent
     * is no longer allowing more intents to be sent through it.
     */
    public void send(int code) throws CanceledException {
        send(null, code, null, null, null);
    }

    /**
     * Perform the operation associated with this PendingIntent, allowing the
     * caller to specify information about the Intent to use.
     *
     * @param context The Context of the caller.
     * @param code Result code to supply back to the PendingIntent's target.
     * @param intent Additional Intent data.  See {@link Intent#fillIn
     * Intent.fillIn()} for information on how this is applied to the
     * original Intent.
     *
     * @see #send(Context, int, Intent, android.app.PendingIntent.OnFinished, Handler)
     *
     * @throws CanceledException Throws CanceledException if the PendingIntent
     * is no longer allowing more intents to be sent through it.
     */
    public void send(Context context, int code, Intent intent)
            throws CanceledException {
        send(context, code, intent, null, null);
    }

    /**
     * Perform the operation associated with this PendingIntent, allowing the
     * caller to be notified when the send has completed.
     *
     * @param code Result code to supply back to the PendingIntent's target.
     * @param onFinished The object to call back on when the send has
     * completed, or null for no callback.
     * @param handler Handler identifying the thread on which the callback
     * should happen.  If null, the callback will happen from the thread
     * pool of the process.
     *
     * @see #send(Context, int, Intent, android.app.PendingIntent.OnFinished, Handler)
     *
     * @throws CanceledException Throws CanceledException if the PendingIntent
     * is no longer allowing more intents to be sent through it.
     */
    public void send(int code, OnFinished onFinished, Handler handler)
            throws CanceledException {
        send(null, code, null, onFinished, handler);
    }

    /**
     * Perform the operation associated with this PendingIntent, allowing the
     * caller to specify information about the Intent to use and be notified
     * when the send has completed.
     *
     * <p>For the intent parameter, a PendingIntent
     * often has restrictions on which fields can be supplied here, based on
     * how the PendingIntent was retrieved in {@link #getActivity},
     * {@link #getBroadcast}, or {@link #getService}.
     *
     * @param context The Context of the caller.  This may be null if
     * <var>intent is also null.
     * @param code Result code to supply back to the PendingIntent's target.
     * @param intent Additional Intent data.  See {@link Intent#fillIn
     * Intent.fillIn()} for information on how this is applied to the
     * original Intent.  Use null to not modify the original Intent.
     * @param onFinished The object to call back on when the send has
     * completed, or null for no callback.
     * @param handler Handler identifying the thread on which the callback
     * should happen.  If null, the callback will happen from the thread
     * pool of the process.
     *
     * @see #send()
     * @see #send(int)
     * @see #send(Context, int, Intent)
     * @see #send(int, android.app.PendingIntent.OnFinished, Handler)
     *
     * @throws CanceledException Throws CanceledException if the PendingIntent
     * is no longer allowing more intents to be sent through it.
     */
    public void send(Context context, int code, Intent intent,
            OnFinished onFinished, Handler handler) throws CanceledException {
        try {
            String resolvedType = intent != null ?
                    intent.resolveTypeIfNeeded(context.getContentResolver())
                    : null;
            int res = mTarget.send(code, intent, resolvedType,
                    onFinished != null
                    ? new FinishedDispatcher(this, onFinished, handler)
                    : null);
            if (res < 0) {
                throw new CanceledException();
            }
        } catch (RemoteException e) {
            throw new CanceledException(e);
        }
    }

    /**
     * Return the package name of the application that created this
     * PendingIntent, that is the identity under which you will actually be
     * sending the Intent.  The returned string is supplied by the system, so
     * that an application can not spoof its package.
     *
     * @return The package name of the PendingIntent, or null if there is
     * none associated with it.
     */
    public String getTargetPackage() {
        try {
            return ActivityManagerNative.getDefault()
                .getPackageForIntentSender(mTarget);
        } catch (RemoteException e) {
            // Should never happen.
            return null;
        }
    }

    /**
     * Comparison operator on two PendingIntent objects, such that true
     * is returned then they both represent the same operation from the
     * same package.  This allows you to use {@link #getActivity},
     * {@link #getBroadcast}, or {@link #getService} multiple times (even
     * across a process being killed), resulting in different PendingIntent
     * objects but whose equals() method identifies them as being the same
     * operation.
     */
    @Override
    public boolean equals(Object otherObj) {
        if (otherObj instanceof PendingIntent) {
            return mTarget.asBinder().equals(((PendingIntent)otherObj)
                    .mTarget.asBinder());
        }
        return false;
    }

    @Override
    public int hashCode() {
        return mTarget.asBinder().hashCode();
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(128);
        sb.append("PendingIntent{");
        sb.append(Integer.toHexString(System.identityHashCode(this)));
        sb.append(": ");
        sb.append(mTarget != null ? mTarget.asBinder() : null);
        sb.append('}');
        return sb.toString();
    }
    
    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel out, int flags) {
        out.writeStrongBinder(mTarget.asBinder());
    }

    public static final Parcelable.Creator<PendingIntent> CREATOR
            = new Parcelable.Creator<PendingIntent>() {
        public PendingIntent createFromParcel(Parcel in) {
            IBinder target = in.readStrongBinder();
            return target != null ? new PendingIntent(target) : null;
        }

        public PendingIntent[] newArray(int size) {
            return new PendingIntent[size];
        }
    };

    /**
     * Convenience function for writing either a PendingIntent or null pointer to
     * a Parcel.  You must use this with {@link #readPendingIntentOrNullFromParcel}
     * for later reading it.
     *
     * @param sender The PendingIntent to write, or null.
     * @param out Where to write the PendingIntent.
     */
    public static void writePendingIntentOrNullToParcel(PendingIntent sender,
            Parcel out) {
        out.writeStrongBinder(sender != null ? sender.mTarget.asBinder()
                : null);
    }

    /**
     * Convenience function for reading either a Messenger or null pointer from
     * a Parcel.  You must have previously written the Messenger with
     * {@link #writePendingIntentOrNullToParcel}.
     *
     * @param in The Parcel containing the written Messenger.
     *
     * @return Returns the Messenger read from the Parcel, or null if null had
     * been written.
     */
    public static PendingIntent readPendingIntentOrNullFromParcel(Parcel in) {
        IBinder b = in.readStrongBinder();
        return b != null ? new PendingIntent(b) : null;
    }

    /*package*/ PendingIntent(IIntentSender target) {
        mTarget = target;
    }

    /*package*/ PendingIntent(IBinder target) {
        mTarget = IIntentSender.Stub.asInterface(target);
    }

    /** @hide */
    public IIntentSender getTarget() {
        return mTarget;
    }
}

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