Added in API level 9

Summary: Ctors | Methods | Inherited Methods

StrictMode.VmPolicy.Builder

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Kotlin |Java

public static final class StrictMode.VmPolicy.Builder
extends Object

java.lang.Object
↳	android.os.StrictMode.VmPolicy.Builder

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Creates VmPolicy instances. Methods whose names start with detect specify what problems we should look for. Methods whose names start with penalty specify what we should do when we detect a problem.

You can call as many detect and penalty methods as you like. Currently order is insignificant: all penalties apply to all detected problems.

For example, detect everything and log anything that's found:

 StrictMode.VmPolicy policy = new StrictMode.VmPolicy.Builder()
     .detectAll()
     .penaltyLog()
     .build();
 StrictMode.setVmPolicy(policy);
 

Summary

Public constructors
Builder()
Builder(StrictMode.VmPolicy base) Builds upon an existing VmPolicy.

Public methods
StrictMode.VmPolicy	build() Constructs the VmPolicy instance.
StrictMode.VmPolicy.Builder	detectActivityLeaks() Detects leaks of Activity subclasses.
StrictMode.VmPolicy.Builder	detectAll() Detects everything that's potentially suspect.
StrictMode.VmPolicy.Builder	detectBlockedBackgroundActivityLaunch() Detects when your app is blocked from launching a background activity or a PendingIntent created by your app cannot be launched.
StrictMode.VmPolicy.Builder	detectCleartextNetwork() Detects any network traffic from the calling app which is not wrapped in SSL/TLS.
StrictMode.VmPolicy.Builder	detectContentUriWithoutPermission() Detects when the calling application sends a content:// Uri to another app without setting Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION.
StrictMode.VmPolicy.Builder	detectCredentialProtectedWhileLocked() Detects access to filesystem paths stored in credential protected storage areas while the user is locked.
StrictMode.VmPolicy.Builder	detectFileUriExposure() Detects when the calling application exposes a file:// Uri to another app.
StrictMode.VmPolicy.Builder	detectImplicitDirectBoot() Detects any implicit reliance on Direct Boot automatic filtering of PackageManager values.
StrictMode.VmPolicy.Builder	detectIncorrectContextUse() Detects attempts to invoke a method on a Context that is not suited for such operation.
StrictMode.VmPolicy.Builder	detectLeakedClosableObjects() Detects when an Closeable or other object with an explicit termination method is finalized without having been closed.
StrictMode.VmPolicy.Builder	detectLeakedRegistrationObjects() Detects when a BroadcastReceiver or ServiceConnection is leaked during Context teardown.
StrictMode.VmPolicy.Builder	detectLeakedSqlLiteObjects() Detects when an SQLiteCursor or other SQLite object is finalized without having been closed.
StrictMode.VmPolicy.Builder	detectNonSdkApiUsage() Detects reflective usage of APIs that are not part of the public Android SDK.
StrictMode.VmPolicy.Builder	detectUnsafeIntentLaunch() Detects when your app sends an unsafe Intent.
StrictMode.VmPolicy.Builder	detectUntaggedSockets() Detects any sockets in the calling app which have not been tagged using TrafficStats.
StrictMode.VmPolicy.Builder	ignoreBlockedBackgroundActivityLaunch() Stops detecting whether your app is blocked from launching a background activity or a PendingIntent created by your app cannot be launched.
StrictMode.VmPolicy.Builder	penaltyDeath() Crashes the whole process on violation.
StrictMode.VmPolicy.Builder	penaltyDeathOnCleartextNetwork() Crashes the whole process when cleartext network traffic is detected.
StrictMode.VmPolicy.Builder	penaltyDeathOnFileUriExposure() Crashes the whole process when a file:// Uri is exposed beyond this app.
StrictMode.VmPolicy.Builder	penaltyDropBox() Enables detected violations log a stacktrace and timing data to the DropBox on policy violation.
StrictMode.VmPolicy.Builder	penaltyListener(Executor executor, StrictMode.OnVmViolationListener listener) Calls #OnVmViolationListener.onVmViolation(Violation) on every violation.
StrictMode.VmPolicy.Builder	penaltyLog() Logs detected violations to the system log.
StrictMode.VmPolicy.Builder	permitNonSdkApiUsage() Permits reflective usage of APIs that are not part of the public Android SDK.
StrictMode.VmPolicy.Builder	permitUnsafeIntentLaunch() Permits your app to launch any Intent which originated from outside your app.
StrictMode.VmPolicy.Builder	setClassInstanceLimit(Class<T> klass, int instanceLimit) Sets an upper bound on how many instances of a class can be in memory at once.

Inherited methods

From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

Builder

Added in API level 9

public Builder ()

Builder

Added in API level 11

public Builder (StrictMode.VmPolicy base)

Builds upon an existing VmPolicy.

Parameters
base	StrictMode.VmPolicy

Public methods

build

Added in API level 9

public StrictMode.VmPolicy build ()

Constructs the VmPolicy instance.

Note: if no penalties are enabled before calling build, penaltyLog() is implicitly set.

Returns
StrictMode.VmPolicy

detectActivityLeaks

Added in API level 11

public StrictMode.VmPolicy.Builder detectActivityLeaks ()

Detects leaks of Activity subclasses.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectAll

Added in API level 9

public StrictMode.VmPolicy.Builder detectAll ()

Detects everything that's potentially suspect.

In the Honeycomb release this includes leaks of SQLite cursors, Activities, and other closable objects but will likely expand in future releases.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectBlockedBackgroundActivityLaunch

Added in Android Baklava

public StrictMode.VmPolicy.Builder detectBlockedBackgroundActivityLaunch ()

Detects when your app is blocked from launching a background activity or a PendingIntent created by your app cannot be launched.

Starting an activity requires specific permissions which may depend on the state at runtime and especially in case of PendingIntent starts on the collaborating app. If the activity start is blocked methods like Context.startActivity(Intent) or PendingIntent.send() have no way to return that information. Instead you can use this strct mode feature to detect blocked starts.

Note that in some cases blocked starts may be unavoidable, e.g. when the user clicks the home button while the app tries to start a new activity.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectCleartextNetwork

Added in API level 23

public StrictMode.VmPolicy.Builder detectCleartextNetwork ()

Detects any network traffic from the calling app which is not wrapped in SSL/TLS. This can help you detect places that your app is inadvertently sending cleartext data across the network.

Using penaltyDeath() or penaltyDeathOnCleartextNetwork() will block further traffic on that socket to prevent accidental data leakage, in addition to crashing your process.

Using penaltyDropBox() will log the raw contents of the packet that triggered the violation.

This inspects both IPv4/IPv6 and TCP/UDP network traffic, but it may be subject to false positives, such as when STARTTLS protocols or HTTP proxies are used.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectContentUriWithoutPermission

Added in API level 26

public StrictMode.VmPolicy.Builder detectContentUriWithoutPermission ()

Detects when the calling application sends a content:// Uri to another app without setting Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION.

Forgetting to include one or more of these flags when sending an intent is typically an app bug.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• Intent.FLAG_GRANT_READ_URI_PERMISSION
• Intent.FLAG_GRANT_WRITE_URI_PERMISSION

detectCredentialProtectedWhileLocked

Added in API level 29

public StrictMode.VmPolicy.Builder detectCredentialProtectedWhileLocked ()

Detects access to filesystem paths stored in credential protected storage areas while the user is locked.

When a user is locked, credential protected storage is unavailable, and files stored in these locations appear to not exist, which can result in subtle app bugs if they assume default behaviors or empty states. Instead, apps should store data needed while a user is locked under device protected storage areas.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• Context.createDeviceProtectedStorageContext()

detectFileUriExposure

Added in API level 18

public StrictMode.VmPolicy.Builder detectFileUriExposure ()

Detects when the calling application exposes a file:// Uri to another app.

This exposure is discouraged since the receiving app may not have access to the shared path. For example, the receiving app may not have requested the Manifest.permission.READ_EXTERNAL_STORAGE runtime permission, or the platform may be sharing the Uri across user profile boundaries.

Instead, apps should use content:// Uris so the platform can extend temporary permission for the receiving app to access the resource.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• FileProvider
• Intent.FLAG_GRANT_READ_URI_PERMISSION

detectImplicitDirectBoot

Added in API level 29

public StrictMode.VmPolicy.Builder detectImplicitDirectBoot ()

Detects any implicit reliance on Direct Boot automatic filtering of PackageManager values. Violations are only triggered when implicit calls are made while the user is locked.

Apps becoming Direct Boot aware need to carefully inspect each query site and explicitly decide which combination of flags they want to use:

• PackageManager.MATCH_DIRECT_BOOT_AWARE
• PackageManager.MATCH_DIRECT_BOOT_UNAWARE
• PackageManager.MATCH_DIRECT_BOOT_AUTO

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectIncorrectContextUse

Added in API level 31

public StrictMode.VmPolicy.Builder detectIncorrectContextUse ()

Detects attempts to invoke a method on a Context that is not suited for such operation.

An example of this is trying to obtain an instance of UI service (e.g. WindowManager) from a non-visual Context. This is not allowed, since a non-visual Context is not adjusted to any visual area, and therefore can report incorrect metrics or resources.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• Context.getDisplay()
• Context.getSystemService(String)

detectLeakedClosableObjects

Added in API level 11

public StrictMode.VmPolicy.Builder detectLeakedClosableObjects ()

Detects when an Closeable or other object with an explicit termination method is finalized without having been closed.

You always want to explicitly close such objects to avoid unnecessary resources leaks.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectLeakedRegistrationObjects

Added in API level 16

public StrictMode.VmPolicy.Builder detectLeakedRegistrationObjects ()

Detects when a BroadcastReceiver or ServiceConnection is leaked during Context teardown.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectLeakedSqlLiteObjects

Added in API level 9

public StrictMode.VmPolicy.Builder detectLeakedSqlLiteObjects ()

Detects when an SQLiteCursor or other SQLite object is finalized without having been closed.

You always want to explicitly close your SQLite cursors to avoid unnecessary database contention and temporary memory leaks.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectNonSdkApiUsage

Added in API level 28

public StrictMode.VmPolicy.Builder detectNonSdkApiUsage ()

Detects reflective usage of APIs that are not part of the public Android SDK.

Note that any non-SDK APIs that this processes accesses before this detection is enabled may not be detected. To ensure that all such API accesses are detected, you should apply this policy as early as possible after process creation.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

detectUnsafeIntentLaunch

Added in API level 31

public StrictMode.VmPolicy.Builder detectUnsafeIntentLaunch ()

Detects when your app sends an unsafe Intent.

Violations may indicate security vulnerabilities in the design of your app, where a malicious app could trick you into granting Uri permissions or launching unexported components. Here are some typical design patterns that can be used to safely resolve these violations:

• If you are sending an implicit intent to an unexported component, you should make it an explicit intent by using Intent.setPackage, Intent.setClassName or Intent.setComponent.
• If you are unparceling and sending an intent from the intent delivered, The ideal approach is to migrate to using a PendingIntent, which ensures that your launch is performed using the identity of the original creator, completely avoiding the security issues described above.
• If using a PendingIntent isn't feasible, an alternative approach is to create a brand new Intent and carefully copy only specific values from the original Intent after careful validation.

Note that this may detect false-positives if your app sends itself an Intent which is first routed through the OS, such as using Intent.createChooser. In these cases, careful inspection is required to determine if the return point into your app is appropriately protected with a signature permission or marked as unexported. If the return point is not protected, your app is likely vulnerable to malicious apps.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• Context.startActivity(Intent)
• Context.startService(Intent)
• Context.bindService(Intent, ServiceConnection, int)
• Context.sendBroadcast(Intent)
• Activity.setResult(int, Intent)

detectUntaggedSockets

Added in API level 26

public StrictMode.VmPolicy.Builder detectUntaggedSockets ()

Detects any sockets in the calling app which have not been tagged using TrafficStats. Tagging sockets can help you investigate network usage inside your app, such as a narrowing down heavy usage to a specific library or component.

This currently does not detect sockets created in native code.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• TrafficStats.setThreadStatsTag(int)
• TrafficStats.tagSocket(java.net.Socket)
• TrafficStats.tagDatagramSocket(java.net.DatagramSocket)

ignoreBlockedBackgroundActivityLaunch

Added in Android Baklava

public StrictMode.VmPolicy.Builder ignoreBlockedBackgroundActivityLaunch ()

Stops detecting whether your app is blocked from launching a background activity or a PendingIntent created by your app cannot be launched.

This disables the effect of detectBlockedBackgroundActivityLaunch().

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

penaltyDeath

Added in API level 9

public StrictMode.VmPolicy.Builder penaltyDeath ()

Crashes the whole process on violation. This penalty runs at the end of all enabled penalties so you'll still get your logging or other violations before the process dies.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

penaltyDeathOnCleartextNetwork

Added in API level 23

public StrictMode.VmPolicy.Builder penaltyDeathOnCleartextNetwork ()

Crashes the whole process when cleartext network traffic is detected.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• detectCleartextNetwork()

penaltyDeathOnFileUriExposure

Added in API level 24

public StrictMode.VmPolicy.Builder penaltyDeathOnFileUriExposure ()

Crashes the whole process when a file:// Uri is exposed beyond this app.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• detectFileUriExposure()

penaltyDropBox

Added in API level 9

public StrictMode.VmPolicy.Builder penaltyDropBox ()

Enables detected violations log a stacktrace and timing data to the DropBox on policy violation. Intended mostly for platform integrators doing beta user field data collection.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

penaltyListener

Added in API level 28

public StrictMode.VmPolicy.Builder penaltyListener (Executor executor, 
                StrictMode.OnVmViolationListener listener)

Calls #OnVmViolationListener.onVmViolation(Violation) on every violation.

Parameters
executor	Executor: This value cannot be null.
listener	StrictMode.OnVmViolationListener: This value cannot be null.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

penaltyLog

Added in API level 9

public StrictMode.VmPolicy.Builder penaltyLog ()

Logs detected violations to the system log.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

permitNonSdkApiUsage

Added in API level 28

public StrictMode.VmPolicy.Builder permitNonSdkApiUsage ()

Permits reflective usage of APIs that are not part of the public Android SDK. Note that this only affects StrictMode, the underlying runtime may continue to restrict or warn on access to methods that are not part of the public SDK.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

permitUnsafeIntentLaunch

Added in API level 31

public StrictMode.VmPolicy.Builder permitUnsafeIntentLaunch ()

Permits your app to launch any Intent which originated from outside your app.

Disabling this check is strongly discouraged, as violations may indicate security vulnerabilities in the design of your app, where a malicious app could trick you into granting Uri permissions or launching unexported components.

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.

See also:

• detectUnsafeIntentLaunch()

setClassInstanceLimit

Added in API level 11

public StrictMode.VmPolicy.Builder setClassInstanceLimit (Class<T> klass, 
                int instanceLimit)

Sets an upper bound on how many instances of a class can be in memory at once. Helps to prevent object leaks.

Parameters
klass	Class
instanceLimit	int

Returns
StrictMode.VmPolicy.Builder	This value cannot be null.