Android限制卸載APK

1.特殊需求，預置在data/app下面的apk不可以通過用戶界面來卸載

方法：

         1.修改frameworks/base/core/java/android/app/ApplicationPackageManager.java

           1） 添加如下代碼

           

//can't uninstall apk that is located at /data/app/
    public boolean canUninstall(String pkg, IPackageDeleteObserver observer){
        String apps = SystemProperties.get("persist.sys.sysapp", null);
        if(apps == null){
            return true;
        }
        Log.v(TAG, "the app list can't be uninstalled ==>:"+apps);
        for(String pkgname:apps.split(",")){
            if(pkgname != null && pkgname.trim().equals(pkg)){
                try {
                    observer.packageDeleted(pkgname, PackageManager.DELETE_FAILED_INTERNAL_ERROR);
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
                return false;
            }
        }
        return true;
    }

  通過讀取系統屬性中設置的apk的packagename來限制卸載apk。例如setprop persist.sys.sysapp "package1, package2" 則package1和package2包名的apk不可被卸載掉

         2）修改原生如下接口：

          

    @Override
    public void deletePackage(String packageName, IPackageDeleteObserver observer, int flags) {
        try {
            if(!canUninstall(packageName, observer)){
                return;
            }
            mPM.deletePackage(packageName, observer, flags);
        } catch (RemoteException e) {
            // Should never happen!
        }
    }