ComponentCaller

See also:

• Activity.getInitialCaller()

checkContentUriPermission

public int checkContentUriPermission (Uri uri, 
                int modeFlags)

Determines whether this component caller had access to a specific content URI at launch time. Apps can use this API to validate content URIs coming from other apps.

Note, in Build.VERSION_CODES.VANILLA_ICE_CREAM only Activity has access to ComponentCaller instances.

Before using this method, note the following:

• You must have access to the supplied URI, otherwise it will throw a SecurityException.
• This is not a real time check, i.e. the permissions have been computed at launch time.
• This method will return the correct result for content URIs passed at launch time, specifically the ones from Intent.getData(), Intent.EXTRA_STREAM, and Intent.getClipData() in the intent of startActivity(intent). For others, it will throw an IllegalArgumentException.

equals

public boolean equals (Object obj)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

getPackage

public String getPackage ()

Returns the package name of this component caller.

Note, in Build.VERSION_CODES.VANILLA_ICE_CREAM only Activity has access to ComponentCaller instances.

Requirements for Activity callers

In order to receive the calling app's package name, at least one of the following has to be met:

• The calling app must call ActivityOptions.setShareIdentityEnabled(boolean) with a value of true and launch this activity with the resulting ActivityOptions.
• The launched activity has the same uid as the calling app.
• The launched activity is running in a package that is signed with the same key used to sign the platform (typically only system packages such as Settings will meet this meet this requirement).

Note, even if the above conditions are not met, the calling app's identity may still be available from Activity.getCallingPackage() if this activity was started with Activity#startActivityForResult to allow validation of the result's recipient.

getUid

public int getUid ()

Returns the uid of this component caller.

Note, in Build.VERSION_CODES.VANILLA_ICE_CREAM only Activity has access to ComponentCaller instances.

Requirements for Activity callers

In order to receive the calling app's uid, at least one of the following has to be met:

• The calling app must call ActivityOptions.setShareIdentityEnabled(boolean) with a value of true and launch this activity with the resulting ActivityOptions.
• The launched activity has the same uid as the calling app.
• The launched activity is running in a package that is signed with the same key used to sign the platform (typically only system packages such as Settings will meet this requirement).

Note, even if the above conditions are not met, the calling app's identity may still be available from Activity.getCallingPackage() if this activity was started with Activity#startActivityForResult to allow validation of the result's recipient.

hashCode

public int hashCode ()

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.