客户需求要求Google Play Store(Phonesky.apk)为可卸载,需要放到system/vendor/operator/app下面。这样在登录Play Store时会遇到以下错误,无法使用:
FATAL EXCEPTION :download-manager-thread
Process: com.android.vending, PID:3016
java.lang.SecurityException:Invalid value for is_public_api: null
…… ……
这是因为非系统应用无法拥有android.permission.ACCESS_DOWNLOAD_MANAGER权限,而在DownloadProvider的insert函数中会调用checkInsertPermissions检查数据库操作权限,如下:
private void checkInsertPermissions(ContentValues values) { if (getContext().checkCallingOrSelfPermission(Downloads.Impl.PERMISSION_ACCESS) == PackageManager.PERMISSION_GRANTED) { return; } getContext().enforceCallingOrSelfPermission(android.Manifest.permission.INTERNET, "INTERNET permission is required to use the download manager"); // ensure the request fits within the bounds of a public API request // first copy so we can remove values values = new ContentValues(values); // check columns whose values are restricted enforceAllowedValues(values, Downloads.Impl.COLUMN_IS_PUBLIC_API, Boolean.TRUE); …… }
由于Google Play Store放到可卸载区后,其Downloads.Impl.COLUMN_IS_PUBLIC_API为空,不满足为true的条件。
解决方案:
【方法一】将Google Play Store放回系统应用区,不做可卸载处理。这样虽然简单,却没有实现客户需求。
【方法二】修改PackageManagerService源码,对Google Play Store做特殊处理,直接给予权限:
--- a/frameworks/base/services/java/com/android/server/pm/PackageManagerService.java +++ b/frameworks/base/services/java/com/android/server/pm/PackageManagerService.java @@ -5938,7 +5938,12 @@ public class PackageManagerService extends IPackageManager.Stub { + ")"); } } + // TChip ZJ Add START:for Phoneshy Permission + if (pkg.packageName.equals("com.android.vending")){ + allowed = true; + } + // TChip ZJ Add END } if ((changedPermission || replace) && !ps.permissionsFixed && !isSystemApp(ps) || isUpdatedSystemApp(ps)){
这样就可以了。