【Android】判断某个AP是否在系统中存在（PackageManager与PackageInfo）
【0】我们可以使用getPackageManager() 方法来查询安装在系统上的AP.
public abstract class
PackageManager
extends Object| java.lang.Object | |
| ↳ | android.content.pm.PackageManager |
| Known Direct Subclasses MockPackageManager |
getPackageManager(). 【1】使用从Manifest.xml文件中获得到的PackageInfo来取得AP的信息. public class PackageInfo
extends Objectimplements Parcelable
| java.lang.Object | |
| ↳ | android.content.pm.PackageInfo |
Overall information about the contents of a package. This corresponds to all of the information collected from AndroidManifest.xml.
public static finalCreator<PackageInfo>CREATOR
Since: API Level 1
publicActivityInfo[]activities
Since: API Level 1 Array of all<activity>tags included under <application>, or null if there were none. This is only filled in if the flagGET_ACTIVITIESwas set.
publicApplicationInfoapplicationInfo
Since: API Level 1Information collected from the <application> tag, or null if there was none.
publicConfigurationInfo[]configPreferences
Since: API Level 3 Application specified preferred configuration<uses-configuration>tags included under <manifest>, or null if there were none. This is only filled in if the flagGET_CONFIGURATIONSwas set.
public longfirstInstallTime
Since: API Level 9 The time at which the app was first installed. Units are as percurrentTimeMillis().
public int[]gids
Since: API Level 1 All kernel group-IDs that have been assigned to this package. This is only filled in if the flagGET_GIDSwas set.
publicInstrumentationInfo[]instrumentation
Since: API Level 1 Array of all<instrumentation>tags included under <manifest>, or null if there were none. This is only filled in if the flagGET_INSTRUMENTATIONwas set.
public longlastUpdateTime
Since: API Level 9 The time at which the app was last updated. Units are as percurrentTimeMillis().
publicStringpackageName
Since: API Level 1The name of this package. From the <manifest> tag's "name" attribute.
publicPermissionInfo[]permissions
Since: API Level 1 Array of all<permission>tags included under <manifest>, or null if there were none. This is only filled in if the flagGET_PERMISSIONSwas set.
publicProviderInfo[]providers
Since: API Level 1 Array of all<provider>tags included under <application>, or null if there were none. This is only filled in if the flagGET_PROVIDERSwas set.
publicActivityInfo[]receivers
Since: API Level 1 Array of all<receiver>tags included under <application>, or null if there were none. This is only filled in if the flagGET_RECEIVERSwas set.
publicFeatureInfo[]reqFeatures
Since: API Level 5The features that this application has said it requires.
publicString[]requestedPermissions
Since: API Level 1 Array of all<uses-permission>tags included under <manifest>, or null if there were none. This is only filled in if the flagGET_PERMISSIONSwas set. This list includes all permissions requested, even those that were not granted or known by the system at install time.
publicServiceInfo[]services
Since: API Level 1 Array of all<service>tags included under <application>, or null if there were none. This is only filled in if the flagGET_SERVICESwas set.
publicStringsharedUserId
Since: API Level 3 The shared user ID name of this package, as specified by the <manifest> tag'ssharedUserIdattribute.
public intsharedUserLabel
Since: API Level 3 The shared user ID label of this package, as specified by the <manifest> tag'ssharedUserLabelattribute.
publicSignature[]signatures
Since: API Level 1 Array of all signatures read from the package file. This is only filled in if the flagGET_SIGNATURESwas set.
public intversionCode
Since: API Level 1 The version number of this package, as specified by the <manifest> tag'sversionCodeattribute.
publicStringversionName
Since: API Level 1 The version name of this package, as specified by the <manifest> tag'sversionNameattribute.
public abstractList<PackageInfo>getInstalledPackages(int flags)
Since: API Level 1Return a List of all packages that are installed on the device.
Parameters
Additional option flags. Use any combination ofGET_ACTIVITIES,GET_GIDS,GET_CONFIGURATIONS,GET_INSTRUMENTATION,GET_PERMISSIONS,GET_PROVIDERS,GET_RECEIVERS,GET_SERVICES,GET_SIGNATURES,GET_UNINSTALLED_PACKAGESto modify the data returned. |
Returns
- A List of PackageInfo objects, one for each package that is installed on the device. In the unlikely case of there being no installed packages, an empty list is returned. If flag GET_UNINSTALLED_PACKAGES is set, a list of all applications including those deleted with DONT_DELETE_DATA (partially installed apps with data directory) will be returned.
谢谢！
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