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Android example source code file (ActivityManager.java)
This example Android source code file (ActivityManager.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.
The ActivityManager.java Android example source code
/*
* Copyright (C) 2007 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.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.ConfigurationInfo;
import android.content.pm.IPackageDataObserver;
import android.graphics.Bitmap;
import android.os.Debug;
import android.os.RemoteException;
import android.os.Handler;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.SystemProperties;
import android.text.TextUtils;
import java.util.List;
/**
* Interact with the overall activities running in the system.
*/
public class ActivityManager {
private static String TAG = "ActivityManager";
private static boolean DEBUG = false;
private static boolean localLOGV = DEBUG || android.util.Config.LOGV;
private final Context mContext;
private final Handler mHandler;
/*package*/ ActivityManager(Context context, Handler handler) {
mContext = context;
mHandler = handler;
}
/**
* Return the approximate per-application memory class of the current
* device. This gives you an idea of how hard a memory limit you should
* impose on your application to let the overall system work best. The
* returned value is in megabytes; the baseline Android memory class is
* 16 (which happens to be the Java heap limit of those devices); some
* device with more memory may return 24 or even higher numbers.
*/
public int getMemoryClass() {
return staticGetMemoryClass();
}
/** @hide */
static public int staticGetMemoryClass() {
// Really brain dead right now -- just take this from the configured
// vm heap size, and assume it is in megabytes and thus ends with "m".
String vmHeapSize = SystemProperties.get("dalvik.vm.heapsize", "16m");
return Integer.parseInt(vmHeapSize.substring(0, vmHeapSize.length()-1));
}
/**
* Information you can retrieve about tasks that the user has most recently
* started or visited.
*/
public static class RecentTaskInfo implements Parcelable {
/**
* If this task is currently running, this is the identifier for it.
* If it is not running, this will be -1.
*/
public int id;
/**
* The original Intent used to launch the task. You can use this
* Intent to re-launch the task (if it is no longer running) or bring
* the current task to the front.
*/
public Intent baseIntent;
/**
* If this task was started from an alias, this is the actual
* activity component that was initially started; the component of
* the baseIntent in this case is the name of the actual activity
* implementation that the alias referred to. Otherwise, this is null.
*/
public ComponentName origActivity;
public RecentTaskInfo() {
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(id);
if (baseIntent != null) {
dest.writeInt(1);
baseIntent.writeToParcel(dest, 0);
} else {
dest.writeInt(0);
}
ComponentName.writeToParcel(origActivity, dest);
}
public void readFromParcel(Parcel source) {
id = source.readInt();
if (source.readInt() != 0) {
baseIntent = Intent.CREATOR.createFromParcel(source);
} else {
baseIntent = null;
}
origActivity = ComponentName.readFromParcel(source);
}
public static final Creator<RecentTaskInfo> CREATOR
= new Creator<RecentTaskInfo>() {
public RecentTaskInfo createFromParcel(Parcel source) {
return new RecentTaskInfo(source);
}
public RecentTaskInfo[] newArray(int size) {
return new RecentTaskInfo[size];
}
};
private RecentTaskInfo(Parcel source) {
readFromParcel(source);
}
}
/**
* Flag for use with {@link #getRecentTasks}: return all tasks, even those
* that have set their
* {@link android.content.Intent#FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS} flag.
*/
public static final int RECENT_WITH_EXCLUDED = 0x0001;
/**
* @hide
* TODO: Make this public. Provides a list that does not contain any
* recent tasks that currently are not available to the user.
*/
public static final int RECENT_IGNORE_UNAVAILABLE = 0x0002;
/**
* Return a list of the tasks that the user has recently launched, with
* the most recent being first and older ones after in order.
*
* @param maxNum The maximum number of entries to return in the list. The
* actual number returned may be smaller, depending on how many tasks the
* user has started and the maximum number the system can remember.
*
* @return Returns a list of RecentTaskInfo records describing each of
* the recent tasks.
*
* @throws SecurityException Throws SecurityException if the caller does
* not hold the {@link android.Manifest.permission#GET_TASKS} permission.
*/
public List<RecentTaskInfo> getRecentTasks(int maxNum, int flags)
throws SecurityException {
try {
return ActivityManagerNative.getDefault().getRecentTasks(maxNum,
flags);
} catch (RemoteException e) {
// System dead, we will be dead too soon!
return null;
}
}
/**
* Information you can retrieve about a particular task that is currently
* "running" in the system. Note that a running task does not mean the
* given task actual has a process it is actively running in; it simply
* means that the user has gone to it and never closed it, but currently
* the system may have killed its process and is only holding on to its
* last state in order to restart it when the user returns.
*/
public static class RunningTaskInfo implements Parcelable {
/**
* A unique identifier for this task.
*/
public int id;
/**
* The component launched as the first activity in the task. This can
* be considered the "application" of this task.
*/
public ComponentName baseActivity;
/**
* The activity component at the top of the history stack of the task.
* This is what the user is currently doing.
*/
public ComponentName topActivity;
/**
* Thumbnail representation of the task's current state.
*/
public Bitmap thumbnail;
/**
* Description of the task's current state.
*/
public CharSequence description;
/**
* Number of activities in this task.
*/
public int numActivities;
/**
* Number of activities that are currently running (not stopped
* and persisted) in this task.
*/
public int numRunning;
public RunningTaskInfo() {
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(id);
ComponentName.writeToParcel(baseActivity, dest);
ComponentName.writeToParcel(topActivity, dest);
if (thumbnail != null) {
dest.writeInt(1);
thumbnail.writeToParcel(dest, 0);
} else {
dest.writeInt(0);
}
TextUtils.writeToParcel(description, dest,
Parcelable.PARCELABLE_WRITE_RETURN_VALUE);
dest.writeInt(numActivities);
dest.writeInt(numRunning);
}
public void readFromParcel(Parcel source) {
id = source.readInt();
baseActivity = ComponentName.readFromParcel(source);
topActivity = ComponentName.readFromParcel(source);
if (source.readInt() != 0) {
thumbnail = Bitmap.CREATOR.createFromParcel(source);
} else {
thumbnail = null;
}
description = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(source);
numActivities = source.readInt();
numRunning = source.readInt();
}
public static final Creator<RunningTaskInfo> CREATOR = new Creator() {
public RunningTaskInfo createFromParcel(Parcel source) {
return new RunningTaskInfo(source);
}
public RunningTaskInfo[] newArray(int size) {
return new RunningTaskInfo[size];
}
};
private RunningTaskInfo(Parcel source) {
readFromParcel(source);
}
}
/**
* Return a list of the tasks that are currently running, with
* the most recent being first and older ones after in order. Note that
* "running" does not mean any of the task's code is currently loaded or
* activity -- the task may have been frozen by the system, so that it
* can be restarted in its previous state when next brought to the
* foreground.
*
* @param maxNum The maximum number of entries to return in the list. The
* actual number returned may be smaller, depending on how many tasks the
* user has started.
*
* @return Returns a list of RunningTaskInfo records describing each of
* the running tasks.
*
* @throws SecurityException Throws SecurityException if the caller does
* not hold the {@link android.Manifest.permission#GET_TASKS} permission.
*/
public List<RunningTaskInfo> getRunningTasks(int maxNum)
throws SecurityException {
try {
return (List<RunningTaskInfo>)ActivityManagerNative.getDefault()
.getTasks(maxNum, 0, null);
} catch (RemoteException e) {
// System dead, we will be dead too soon!
return null;
}
}
/**
* Information you can retrieve about a particular Service that is
* currently running in the system.
*/
public static class RunningServiceInfo implements Parcelable {
/**
* The service component.
*/
public ComponentName service;
/**
* If non-zero, this is the process the service is running in.
*/
public int pid;
/**
* The UID that owns this service.
*/
public int uid;
/**
* The name of the process this service runs in.
*/
public String process;
/**
* Set to true if the service has asked to run as a foreground process.
*/
public boolean foreground;
/**
* The time when the service was first made active, either by someone
* starting or binding to it.
*/
public long activeSince;
/**
* Set to true if this service has been explicitly started.
*/
public boolean started;
/**
* Number of clients connected to the service.
*/
public int clientCount;
/**
* Number of times the service's process has crashed while the service
* is running.
*/
public int crashCount;
/**
* The time when there was last activity in the service (either
* explicit requests to start it or clients binding to it).
*/
public long lastActivityTime;
/**
* If non-zero, this service is not currently running, but scheduled to
* restart at the given time.
*/
public long restarting;
/**
* Bit for {@link #flags}: set if this service has been
* explicitly started.
*/
public static final int FLAG_STARTED = 1<<0;
/**
* Bit for {@link #flags}: set if the service has asked to
* run as a foreground process.
*/
public static final int FLAG_FOREGROUND = 1<<1;
/**
* Bit for {@link #flags): set if the service is running in a
* core system process.
*/
public static final int FLAG_SYSTEM_PROCESS = 1<<2;
/**
* Bit for {@link #flags): set if the service is running in a
* persistent process.
*/
public static final int FLAG_PERSISTENT_PROCESS = 1<<3;
/**
* Running flags.
*/
public int flags;
/**
* For special services that are bound to by system code, this is
* the package that holds the binding.
*/
public String clientPackage;
/**
* For special services that are bound to by system code, this is
* a string resource providing a user-visible label for who the
* client is.
*/
public int clientLabel;
public RunningServiceInfo() {
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
ComponentName.writeToParcel(service, dest);
dest.writeInt(pid);
dest.writeInt(uid);
dest.writeString(process);
dest.writeInt(foreground ? 1 : 0);
dest.writeLong(activeSince);
dest.writeInt(started ? 1 : 0);
dest.writeInt(clientCount);
dest.writeInt(crashCount);
dest.writeLong(lastActivityTime);
dest.writeLong(restarting);
dest.writeInt(this.flags);
dest.writeString(clientPackage);
dest.writeInt(clientLabel);
}
public void readFromParcel(Parcel source) {
service = ComponentName.readFromParcel(source);
pid = source.readInt();
uid = source.readInt();
process = source.readString();
foreground = source.readInt() != 0;
activeSince = source.readLong();
started = source.readInt() != 0;
clientCount = source.readInt();
crashCount = source.readInt();
lastActivityTime = source.readLong();
restarting = source.readLong();
flags = source.readInt();
clientPackage = source.readString();
clientLabel = source.readInt();
}
public static final Creator<RunningServiceInfo> CREATOR = new Creator() {
public RunningServiceInfo createFromParcel(Parcel source) {
return new RunningServiceInfo(source);
}
public RunningServiceInfo[] newArray(int size) {
return new RunningServiceInfo[size];
}
};
private RunningServiceInfo(Parcel source) {
readFromParcel(source);
}
}
/**
* Return a list of the services that are currently running.
*
* @param maxNum The maximum number of entries to return in the list. The
* actual number returned may be smaller, depending on how many services
* are running.
*
* @return Returns a list of RunningServiceInfo records describing each of
* the running tasks.
*/
public List<RunningServiceInfo> getRunningServices(int maxNum)
throws SecurityException {
try {
return (List<RunningServiceInfo>)ActivityManagerNative.getDefault()
.getServices(maxNum, 0);
} catch (RemoteException e) {
// System dead, we will be dead too soon!
return null;
}
}
/**
* Returns a PendingIntent you can start to show a control panel for the
* given running service. If the service does not have a control panel,
* null is returned.
*/
public PendingIntent getRunningServiceControlPanel(ComponentName service)
throws SecurityException {
try {
return ActivityManagerNative.getDefault()
.getRunningServiceControlPanel(service);
} catch (RemoteException e) {
// System dead, we will be dead too soon!
return null;
}
}
/**
* Information you can retrieve about the available memory through
* {@link ActivityManager#getMemoryInfo}.
*/
public static class MemoryInfo implements Parcelable {
/**
* The total available memory on the system. This number should not
* be considered absolute: due to the nature of the kernel, a significant
* portion of this memory is actually in use and needed for the overall
* system to run well.
*/
public long availMem;
/**
* The threshold of {@link #availMem} at which we consider memory to be
* low and start killing background services and other non-extraneous
* processes.
*/
public long threshold;
/**
* Set to true if the system considers itself to currently be in a low
* memory situation.
*/
public boolean lowMemory;
public MemoryInfo() {
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeLong(availMem);
dest.writeLong(threshold);
dest.writeInt(lowMemory ? 1 : 0);
}
public void readFromParcel(Parcel source) {
availMem = source.readLong();
threshold = source.readLong();
lowMemory = source.readInt() != 0;
}
public static final Creator<MemoryInfo> CREATOR
= new Creator<MemoryInfo>() {
public MemoryInfo createFromParcel(Parcel source) {
return new MemoryInfo(source);
}
public MemoryInfo[] newArray(int size) {
return new MemoryInfo[size];
}
};
private MemoryInfo(Parcel source) {
readFromParcel(source);
}
}
public void getMemoryInfo(MemoryInfo outInfo) {
try {
ActivityManagerNative.getDefault().getMemoryInfo(outInfo);
} catch (RemoteException e) {
}
}
/**
* @hide
*/
public boolean clearApplicationUserData(String packageName, IPackageDataObserver observer) {
try {
return ActivityManagerNative.getDefault().clearApplicationUserData(packageName,
observer);
} catch (RemoteException e) {
return false;
}
}
/**
* Information you can retrieve about any processes that are in an error condition.
*/
public static class ProcessErrorStateInfo implements Parcelable {
/**
* Condition codes
*/
public static final int NO_ERROR = 0;
public static final int CRASHED = 1;
public static final int NOT_RESPONDING = 2;
/**
* The condition that the process is in.
*/
public int condition;
/**
* The process name in which the crash or error occurred.
*/
public String processName;
/**
* The pid of this process; 0 if none
*/
public int pid;
/**
* The kernel user-ID that has been assigned to this process;
* currently this is not a unique ID (multiple applications can have
* the same uid).
*/
public int uid;
/**
* The activity name associated with the error, if known. May be null.
*/
public String tag;
/**
* A short message describing the error condition.
*/
public String shortMsg;
/**
* A long message describing the error condition.
*/
public String longMsg;
/**
* The stack trace where the error originated. May be null.
*/
public String stackTrace;
/**
* to be deprecated: This value will always be null.
*/
public byte[] crashData = null;
public ProcessErrorStateInfo() {
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(condition);
dest.writeString(processName);
dest.writeInt(pid);
dest.writeInt(uid);
dest.writeString(tag);
dest.writeString(shortMsg);
dest.writeString(longMsg);
dest.writeString(stackTrace);
}
public void readFromParcel(Parcel source) {
condition = source.readInt();
processName = source.readString();
pid = source.readInt();
uid = source.readInt();
tag = source.readString();
shortMsg = source.readString();
longMsg = source.readString();
stackTrace = source.readString();
}
public static final Creator<ProcessErrorStateInfo> CREATOR =
new Creator<ProcessErrorStateInfo>() {
public ProcessErrorStateInfo createFromParcel(Parcel source) {
return new ProcessErrorStateInfo(source);
}
public ProcessErrorStateInfo[] newArray(int size) {
return new ProcessErrorStateInfo[size];
}
};
private ProcessErrorStateInfo(Parcel source) {
readFromParcel(source);
}
}
/**
* Returns a list of any processes that are currently in an error condition. The result
* will be null if all processes are running properly at this time.
*
* @return Returns a list of ProcessErrorStateInfo records, or null if there are no
* current error conditions (it will not return an empty list). This list ordering is not
* specified.
*/
public List<ProcessErrorStateInfo> getProcessesInErrorState() {
try {
return ActivityManagerNative.getDefault().getProcessesInErrorState();
} catch (RemoteException e) {
return null;
}
}
/**
* Information you can retrieve about a running process.
*/
public static class RunningAppProcessInfo implements Parcelable {
/**
* The name of the process that this object is associated with
*/
public String processName;
/**
* The pid of this process; 0 if none
*/
public int pid;
/**
* The user id of this process.
*/
public int uid;
public String pkgList[];
/**
* Constant for {@link #importance}: this process is running the
* foreground UI.
*/
public static final int IMPORTANCE_FOREGROUND = 100;
/**
* Constant for {@link #importance}: this process is running something
* that is considered to be actively visible to the user.
*/
public static final int IMPORTANCE_VISIBLE = 200;
/**
* Constant for {@link #importance}: this process is contains services
* that should remain running.
*/
public static final int IMPORTANCE_SERVICE = 300;
/**
* Constant for {@link #importance}: this process process contains
* background code that is expendable.
*/
public static final int IMPORTANCE_BACKGROUND = 400;
/**
* Constant for {@link #importance}: this process is empty of any
* actively running code.
*/
public static final int IMPORTANCE_EMPTY = 500;
/**
* The relative importance level that the system places on this
* process. May be one of {@link #IMPORTANCE_FOREGROUND},
* {@link #IMPORTANCE_VISIBLE}, {@link #IMPORTANCE_SERVICE},
* {@link #IMPORTANCE_BACKGROUND}, or {@link #IMPORTANCE_EMPTY}. These
* constants are numbered so that "more important" values are always
* smaller than "less important" values.
*/
public int importance;
/**
* An additional ordering within a particular {@link #importance}
* category, providing finer-grained information about the relative
* utility of processes within a category. This number means nothing
* except that a smaller values are more recently used (and thus
* more important). Currently an LRU value is only maintained for
* the {@link #IMPORTANCE_BACKGROUND} category, though others may
* be maintained in the future.
*/
public int lru;
/**
* Constant for {@link #importanceReasonCode}: nothing special has
* been specified for the reason for this level.
*/
public static final int REASON_UNKNOWN = 0;
/**
* Constant for {@link #importanceReasonCode}: one of the application's
* content providers is being used by another process. The pid of
* the client process is in {@link #importanceReasonPid} and the
* target provider in this process is in
* {@link #importanceReasonComponent}.
*/
public static final int REASON_PROVIDER_IN_USE = 1;
/**
* Constant for {@link #importanceReasonCode}: one of the application's
* content providers is being used by another process. The pid of
* the client process is in {@link #importanceReasonPid} and the
* target provider in this process is in
* {@link #importanceReasonComponent}.
*/
public static final int REASON_SERVICE_IN_USE = 2;
/**
* The reason for {@link #importance}, if any.
*/
public int importanceReasonCode;
/**
* For the specified values of {@link #importanceReasonCode}, this
* is the process ID of the other process that is a client of this
* process. This will be 0 if no other process is using this one.
*/
public int importanceReasonPid;
/**
* For the specified values of {@link #importanceReasonCode}, this
* is the name of the component that is being used in this process.
*/
public ComponentName importanceReasonComponent;
public RunningAppProcessInfo() {
importance = IMPORTANCE_FOREGROUND;
importanceReasonCode = REASON_UNKNOWN;
}
public RunningAppProcessInfo(String pProcessName, int pPid, String pArr[]) {
processName = pProcessName;
pid = pPid;
pkgList = pArr;
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(processName);
dest.writeInt(pid);
dest.writeInt(uid);
dest.writeStringArray(pkgList);
dest.writeInt(importance);
dest.writeInt(lru);
dest.writeInt(importanceReasonCode);
dest.writeInt(importanceReasonPid);
ComponentName.writeToParcel(importanceReasonComponent, dest);
}
public void readFromParcel(Parcel source) {
processName = source.readString();
pid = source.readInt();
uid = source.readInt();
pkgList = source.readStringArray();
importance = source.readInt();
lru = source.readInt();
importanceReasonCode = source.readInt();
importanceReasonPid = source.readInt();
importanceReasonComponent = ComponentName.readFromParcel(source);
}
public static final Creator<RunningAppProcessInfo> CREATOR =
new Creator<RunningAppProcessInfo>() {
public RunningAppProcessInfo createFromParcel(Parcel source) {
return new RunningAppProcessInfo(source);
}
public RunningAppProcessInfo[] newArray(int size) {
return new RunningAppProcessInfo[size];
}
};
private RunningAppProcessInfo(Parcel source) {
readFromParcel(source);
}
}
/**
* Returns a list of application processes installed on external media
* that are running on the device.
*
* @return Returns a list of ApplicationInfo records, or null if none
* This list ordering is not specified.
* @hide
*/
public List<ApplicationInfo> getRunningExternalApplications() {
try {
return ActivityManagerNative.getDefault().getRunningExternalApplications();
} catch (RemoteException e) {
return null;
}
}
/**
* Returns a list of application processes that are running on the device.
*
* @return Returns a list of RunningAppProcessInfo records, or null if there are no
* running processes (it will not return an empty list). This list ordering is not
* specified.
*/
public List<RunningAppProcessInfo> getRunningAppProcesses() {
try {
return ActivityManagerNative.getDefault().getRunningAppProcesses();
} catch (RemoteException e) {
return null;
}
}
/**
* Return information about the memory usage of one or more processes.
*
* @param pids The pids of the processes whose memory usage is to be
* retrieved.
* @return Returns an array of memory information, one for each
* requested pid.
*/
public Debug.MemoryInfo[] getProcessMemoryInfo(int[] pids) {
try {
return ActivityManagerNative.getDefault().getProcessMemoryInfo(pids);
} catch (RemoteException e) {
return null;
}
}
/**
* @deprecated This is now just a wrapper for
* {@link #killBackgroundProcesses(String)}; the previous behavior here
* is no longer available to applications because it allows them to
* break other applications by removing their alarms, stopping their
* services, etc.
*/
@Deprecated
public void restartPackage(String packageName) {
killBackgroundProcesses(packageName);
}
/**
* Have the system immediately kill all background processes associated
* with the given package. This is the same as the kernel killing those
* processes to reclaim memory; the system will take care of restarting
* these processes in the future as needed.
*
* <p>You must hold the permission
* {@link android.Manifest.permission#KILL_BACKGROUND_PROCESSES} to be able to
* call this method.
*
* @param packageName The name of the package whose processes are to
* be killed.
*/
public void killBackgroundProcesses(String packageName) {
try {
ActivityManagerNative.getDefault().killBackgroundProcesses(packageName);
} catch (RemoteException e) {
}
}
/**
* Have the system perform a force stop of everything associated with
* the given application package. All processes that share its uid
* will be killed, all services it has running stopped, all activities
* removed, etc. In addition, a {@link Intent#ACTION_PACKAGE_RESTARTED}
* broadcast will be sent, so that any of its registered alarms can
* be stopped, notifications removed, etc.
*
* <p>You must hold the permission
* {@link android.Manifest.permission#FORCE_STOP_PACKAGES} to be able to
* call this method.
*
* @param packageName The name of the package to be stopped.
*
* @hide This is not available to third party applications due to
* it allowing them to break other applications by stopping their
* services, removing their alarms, etc.
*/
public void forceStopPackage(String packageName) {
try {
ActivityManagerNative.getDefault().forceStopPackage(packageName);
} catch (RemoteException e) {
}
}
/**
* Get the device configuration attributes.
*/
public ConfigurationInfo getDeviceConfigurationInfo() {
try {
return ActivityManagerNative.getDefault().getDeviceConfigurationInfo();
} catch (RemoteException e) {
}
return null;
}
/**
* Returns "true" if the user interface is currently being messed with
* by a monkey.
*/
public static boolean isUserAMonkey() {
try {
return ActivityManagerNative.getDefault().isUserAMonkey();
} catch (RemoteException e) {
}
return false;
}
}
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