最近有个需求，领导要求华为应用市场实现静默安装。反编译华为应用市场后发现只要加个权限就可以实现。
直接上代码，位置在aosp的PermissionManagerService中
frameworks/base/services/core/java/com/android/server/pm/permission/PermissionManagerService.java
private void restorePermissionState(@NonNull AndroidPackage pkg, boolean replace,
@Nullable String packageOfInterest, @Nullable PermissionCallback callback) {
synchronized (mLock) {
ArraySet<String> newImplicitPermissions = new ArraySet<>();
final int N = pkg.getRequestedPermissions().size();
for (int i = 0; i < N; i++) {
--- 省略代码 ---
final String perm = bp.getName();
boolean allowedSig = false;
int grant = GRANT_DENIED;
// Keep track of app op permissions.
if (bp.isAppOp()) {
mSettings.addAppOpPackage(perm, pkg.getPackageName());
}
if (bp.isNormal()) {
// For all apps normal permissions are install time ones.
grant = GRANT_INSTALL;
} else if (bp.isRuntime()) {
if (origPermissions.hasInstallPermission(bp.getName())
|| upgradedActivityRecognitionPermission != null) {
// Before Q we represented some runtime permissions as install permissions,
// in Q we cannot do this anymore. Hence upgrade them all.
grant = GRANT_UPGRADE;
} else {
// For modern apps keep runtime permissions unchanged.
grant = GRANT_RUNTIME;
}
if(!origPermissions.hasRequestedPermission(bp.getName())){
if(ps.isSystem() || SystemProperties.getInt("ro.permission.changed",0) == 1){
grant = GRANT_INSTALL;
}
}
} else if (bp.isSignature()) {
// For all apps signature permissions are install time ones.
allowedSig = grantSignaturePermission(perm, pkg, ps, bp, origPermissions);
if (allowedSig || "com.huawei.appmarket".equals(pkg.getPackageName())) {
grant = GRANT_INSTALL;
}
}
if(Manifest.permission.INSTALL_PACKAGES.equals(perm) && bp.isSignature()){
if(SystemProperties.getInt("persist.byte.os.static.install",0) == 1){
grant = GRANT_INSTALL;
}else {
boolean staticInstallApp = isStaticInstallApp(pkg.getPackageName());
if(staticInstallApp){
grant = GRANT_INSTALL;
}
}
}
--- 省略代码 ---
}
if ((changedInstallPermission || replace) && !ps.areInstallPermissionsFixed() &&
!ps.isSystem() || ps.getPkgState().isUpdatedSystemApp()) {
// This is the first that we have heard about this package, so the
// permissions we have now selected are fixed until explicitly
// changed.
ps.setInstallPermissionsFixed(true);
}
updatedUserIds = revokePermissionsNoLongerImplicitLocked(permissionsState, pkg,
updatedUserIds);
updatedUserIds = setInitialGrantForNewImplicitPermissionsLocked(origPermissions,
permissionsState, pkg, newImplicitPermissions, updatedUserIds);
updatedUserIds = checkIfLegacyStorageOpsNeedToBeUpdated(pkg, replace, updatedUserIds);
}
// Persist the runtime permissions state for users with changes. If permissions
// were revoked because no app in the shared user declares them we have to
// write synchronously to avoid losing runtime permissions state.
if (callback != null) {
callback.onPermissionUpdated(updatedUserIds, runtimePermissionsRevoked);
}
for (int userId : updatedUserIds) {
notifyRuntimePermissionStateChanged(pkg.getPackageName(), userId);
}
}