Convert unsigned apk into signed apk

Question

I have an android application with un-signed package, Whenever I try to install this apk, following error message throws Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES].

Now I want to insert my keystore certifcate with this apk file. is there any possibilities to do this with external command rather than IDE?

Answer 1

We can do this via jarsigner tool comes with the JDK

Steps

In Windows

Step 1: set path C:\Program Files (x86)\Java\jdk1.8.0_20\bin in command line

Step 2: jarsigner -verbose -keystore /path_to_keystore/keystoreFileName /path_to_apk_file/application_name.apk keystoreFileName_alias

-keystoreFileName_alias. You have to provide your alias name of your keystore file name.

Step 3: Enter password of your keystore file

Step 4: Completed. It will displays warning messages like certifaction validity etc..

Step 5: Verify your apk file jarsigner -verify /path_to_apk_file/application_name.apk

Zip align:

Step 6: set path C:\Program Files (x86)\Android\sdk\build-tools\android-4.4W in command line

Step 7: zipalign -v 4 /path_to_apk_file/application_name.apk /path_to_destination_apk_locaion/zipped_application_name.apk