【Android】判斷某個AP是否在系統中存在（PackageManager與PackageInfo）
【0】我們可以使用getPackageManager()
方法來查詢安裝在系統上的AP.
| java.lang.Object | |
| ↳ | android.content.pm.PackageManager |
 Known
Direct Subclasses
|
getPackageManager().
| 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.
publicActivityInfo[]activities
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
Information collected from the <application> tag, or null if there was none.
publicConfigurationInfo[]configPreferences
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
The time at which the app was first installed. Units are as percurrentTimeMillis().
public int[]gids
All kernel group-IDs that have been assigned to this package. This is only filled in if the flagGET_GIDSwas
set.
publicInstrumentationInfo[]instrumentation
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
The time at which the app was last updated. Units are as percurrentTimeMillis().
publicStringpackageName
The name of this package. From the <manifest> tag's "name" attribute.
publicPermissionInfo[]permissions
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
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
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
The features that this application has said it requires.
publicString[]requestedPermissions
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
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
The shared user ID name of this package, as specified by the <manifest> tag'ssharedUserIdattribute.
public intsharedUserLabel
The shared user ID label of this package, as specified by the <manifest> tag'ssharedUserLabelattribute.
publicSignature[]signatures
Array of all signatures read from the package file. This is only filled in if the flagGET_SIGNATURESwas
set.
public intversionCode
The version number of this package, as specified by the <manifest> tag'sversionCodeattribute.
publicStringversionName
The version name of this package, as specified by the <manifest> tag'sversionNameattribute.
/**
* Whether the AP was installed
* @param context:the Context
* @param packageName:the ap packageName
* @return
*/
public static boolean isAppInstalled(Context context, String packageName)
{
//獲取到一個PackageManager的instance
final PackageManager packageManager = context.getPackageManager();
//PERMISSION_GRANTED = 0
List<PackageInfo> mPackageInfo = packageManager.getInstalledPackages(0);
boolean flag = false;
if(mPackageInfo != null)
{
String tempName = null;
for(int i = 0; i < mPackageInfo.size(); i++)
{
//獲取到AP包名
tempName = mPackageInfo.get(i).packageName;
if(tempName != null && tempName.equals(packageName))
{
MyLogger.kLog().i("Package[" + packageName + "]:is installed.");
flag = true;
break;
}
}
}
return flag;
}public abstractList<PackageInfo>getInstalledPackages(int flags)
Return a List of all packages that are installed on the device.
Parameters
| flags |
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.
謝謝！
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