Android system requirements for all programs through digital signatures to install, if there is no available digital signatures, the system will not run the installation program. Whether simulator or real equipment, as long as it is android system, this all applicable. For this reason, in the equipment or simulator operation commissioning before program, you must for your application Settings digital signature. Understand the important time signature android program: : · all programs are must sign, not be the signature program, the system will not be installed. · you can use since the signing certificate signed your application, must be no vouchers authorized yes. · system will only in the installation test signature the period of validity of the certificate, if the application s signature is in after installation expires, so the application can still normal enabled. · you can use a standard tools-Keytool and Jarsigner-generate the keys, to sign the application s. Apk files.

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