在安裝的時候提示沒有許可權安裝，需要簽名才能安裝。
先生成key store檔案。
# 別名是androidtest
# 加密方式ras
# 有效期 365天
keytool -genkey -v -keystore android.keystore -alias androidtest -keyalg rsa -validity 365
enter keystore password:
what is your first and last name?
[unknown]: test
what is the name of your organizational unit?
[unknown]: test
what is the name of your organization?
[unknown]: test
what is the name of your city or locality?
[unknown]: test
what is the name of your state or province?
[unknown]: test
what is the two-letter country code for this unit?
[unknown]: test
is cn=test, ou=test, o=test, l=test, st=test, c=test correct?
[no]: yes
generating 2,048 bit rsa key pair and self-signed certificate (sha256withrsa) with a validity of 365 days
for: cn=test, ou=test, o=test, l=test, st=test, c=test
enter key password for (return if same as keystore password):
re-enter new password:
[storing android.keystore]
# 對於一般的apk，簽名方式就是releasekey。
jarsigner -verbose -keystore androidtest.jks -storepass android -keypass android apkname.apk releasekey
# 如果是apk需要系統許可權的話的， 需要簽名為platform key
jarsigner -verbose -keystore androidtest.jks -storepass android -keypass android apkname.apk platform
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