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An existing package by the same name with a conflicting signature is already installed (安裝套件與現有套件名稱相同但簽名不符)

When the existing apps or the apk file that you want to install signed by a special key,

this error message may occur.



Place this into your module build.gradle

android {
    signingConfigs {
        config {
            storeFile file('C:/AndroidKey.key')
            storePassword '1234'
            keyAlias 'adb_key'
            keyPassword '1234'

More explain:

AndroidStudio use a  default debug key to sign your apk every time.
Some tutorial use a wrong way to make both key as a debug key. It is wrong.
The correct way should be both key is the release apk key.


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