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[英]How to get permission to write files into SDCard in Android 6.0+
[英]Is it possible to check if another app has been granted a permission on Android 6.0+?
我想檢查另一個應用程序是否已被授予“危險”或“系統”級別的權限。
我嘗試加載另一個應用程序的上下文並調用packageContext.checkCallingPermission(permission)
。 但是,文檔說它返回
如果允許調用pid / uid的權限為PERMISSION_GRANTED,否則為PERMISSION_DENIED。
是否可以檢查是否已授予另一個應用程序許可?
這是我的嘗試(我在意識到它檢查調用的pid / uid之前似乎寫過它,而且似乎沒有考慮上下文):
void checkAllGrantedPermissions(Context context) {
PackageManager pm = context.getPackageManager();
// get all installed apps with info about what permissions they requested.
List<PackageInfo> packageInfos = pm.getInstalledPackages(PackageManager.GET_PERMISSIONS);
// Get the hidden method PermissionInfo#protectionToString(int) so we can log info about the requested permission
Method protectionToString;
try {
protectionToString = PermissionInfo.class.getDeclaredMethod("protectionToString", int.class);
if (!protectionToString.isAccessible()) protectionToString.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
// loop through all installed apps
for (PackageInfo packageInfo : packageInfos) {
if (packageInfo.requestedPermissions == null) {
// No permissions are requested in the AndroidManifest
continue;
}
String appName = packageInfo.applicationInfo.loadLabel(pm).toString();
String packageName = packageInfo.packageName;
// loop through all requested permissions in the AndroidManifest
for (String permission : packageInfo.requestedPermissions) {
PermissionInfo permissionInfo;
try {
permissionInfo = pm.getPermissionInfo(permission, 0);
} catch (PackageManager.NameNotFoundException e) {
Log.i(TAG, String.format("unknown permission '%s' found in '%s'", permission, packageName));
continue;
}
// convert the protectionLevel to a string (not necessary, but useful info)
String protLevel;
try {
protLevel = (String) protectionToString.invoke(null, permissionInfo.protectionLevel);
} catch (Exception ignored) {
protLevel = "????";
}
// Create the package's context to check if the package has the requested permission
Context packageContext;
try {
packageContext = context.createPackageContext(packageName, 0);
} catch (PackageManager.NameNotFoundException wtf) {
continue;
}
int ret = packageContext.checkCallingPermission(permission);
if (ret == PackageManager.PERMISSION_DENIED) {
Log.i(TAG, String.format("%s [%s] is denied permission %s (%s)",
appName, packageName, permission, protLevel));
} else {
Log.i(TAG, String.format("%s [%s] has granted permission %s (%s)",
appName, packageName, permission, protLevel));
}
}
}
}
是否可以檢查是否已授予另一個應用程序許可?
是的。 您可以檢索標記每個<uses-permission>
標簽中的清單使用給定的包PackageInfo.requestedPermissionsFlags
然后比較使用了位運算的標志PackageInfo.REQUESTED_PERMISSION_GRANTED
。
我想檢查另一個應用程序是否已被授予“危險”或“系統”級別的權限。
您可以使用PackageManager.getPermissionInfo
進行此檢查,然后將PermissionInfo.protectionLevel
與PermissionInfo.PROTECTION_DANGEROUS
或PermissionInfo.PROTECTION_SIGNATURE
之一進行比較。
例如 :
final PackageManager pm = getPackageManager();
// Loop each package requesting <manifest> permissions
for (final PackageInfo pi : pm.getInstalledPackages(GET_PERMISSIONS)) {
final String[] requestedPermissions = pi.requestedPermissions;
if (requestedPermissions == null) {
// No permissions defined in <manifest>
continue;
}
// Loop each <uses-permission> tag to retrieve the permission flag
for (int i = 0, len = requestedPermissions.length; i < len; i++) {
final String requestedPerm = requestedPermissions[i];
// Retrieve the protection level for each requested permission
int protLevel;
try {
protLevel = pm.getPermissionInfo(requestedPerm, 0).protectionLevel;
} catch (PackageManager.NameNotFoundException e) {
Log.e(TAG, "Unknown permission: " + requestedPerm, e);
continue;
}
final boolean system = protLevel == PROTECTION_SIGNATURE;
final boolean dangerous = protLevel == PROTECTION_DANGEROUS;
final boolean granted = (pi.requestedPermissionsFlags[i]
& REQUESTED_PERMISSION_GRANTED) != 0;
}
}
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