Jason 讓傑森幫你節省^^ @jal5385h

        try {
            PackageManager packageManager = mContext.getPackageManager();
            PackageInfo ap = packageManager.getPackageInfo("包名", 0);
            Vsersion = ap.versionName;
        }catch (Exception e){
            
        }

利用PackageManager 取值，不過要注意的是這個取到的值是

manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="包名"
    android:versionCode="1"
    android:versionName="1.0" >