与2020年一样：从API 28（Android 9（Pie））开始，“versionCode”被弃用，因此我们可以使用“longVersionCode”。

Kotlin中的示例代码

val manager = context?.packageManager
val info = manager?.getPackageInfo(
    context?.packageName, 0
)

val versionName = info?.versionName
val versionNumber = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                        info?.longVersionCode
                    } else {
                        info?.versionCode
                    }

内部片段用法示例。

import android.content.pm.PackageManager;
.......

private String VersionName;
private String VersionCode;
.......


Context context = getActivity().getApplicationContext();

/* Getting application version name and code */
try
{
     VersionName = context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionName;

     /* I find it useful to convert vervion code into String,
        so it's ready for TextViev/server side checks
     */

     VersionCode = Integer.toString(context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionCode);
}
catch (PackageManager.NameNotFoundException e)
{
     e.printStackTrace();
}

// Do something useful with that

试试这个：

try
{
    device_version =  getPackageManager().getPackageInfo("com.google.android.gms", 0).versionName;
}
catch (PackageManager.NameNotFoundException e)
{
    e.printStackTrace();
}

PackageInfo pinfo = null;
try {
    pinfo = getPackageManager().getPackageInfo(getPackageName(), 0);
}
catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}
int versionNumber = pinfo.versionCode;
String versionName = pinfo.versionName;

您需要两个部分：

android：版本代码android:versionName

versionCode是一个数字，您向市场提交的应用程序的每个版本都需要有一个比上一个版本更高的数字。

VersionName是一个字符串，可以是任何你想要的东西。这是你定义你的应用程序为“1.0”或“2.5”或“2 Alpha EXTREME！”或任何东西的地方。

例子：

科特林：

val manager = this.packageManager
val info = manager.getPackageInfo(this.packageName, PackageManager.GET_ACTIVITIES)
toast("PackageName = " + info.packageName + "\nVersionCode = "
            + info.versionCode + "\nVersionName = "
            + info.versionName + "\nPermissions = " + info.permissions)

Java语言：

PackageManager manager = this.getPackageManager();
PackageInfo info = manager.getPackageInfo(this.getPackageName(), PackageManager.GET_ACTIVITIES);
Toast.makeText(this,
     "PackageName = " + info.packageName + "\nVersionCode = "
       + info.versionCode + "\nVersionName = "
       + info.versionName + "\nPermissions = " + info.permissions, Toast.LENGTH_SHORT).show();

private String GetAppVersion() {
    try {
        PackageInfo _info = mContext.getPackageManager().getPackageInfo(mContext.getPackageName(), 0);
        return _info.versionName;
    }
    catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
        return "";
    }
}

private int GetVersionCode() {
    try {
        PackageInfo _info = mContext.getPackageManager().getPackageInfo(mContext.getPackageName(), 0);
        return _info.versionCode;
    }
    catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
        return -1;
    }
}