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();

版本名称：BuildConfig.version_name版本代码：BuildConfig.version_code

try {
    PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
    String versionName = packageInfo.versionName;
    int versionCode = packageInfo.versionCode;
    //binding.tvVersionCode.setText("v" + packageInfo.versionName);
}
catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}

package com.sqisland.android.versionview;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    TextView textViewversionName = (TextView) findViewById(R.id.text);

    try {
        PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
        textViewversionName.setText(packageInfo.versionName);

    }
    catch (PackageManager.NameNotFoundException e) {

    }
  }
}

这段代码在上面提到过，但在这里，它再次全部包含在内。您需要try/catch块，因为它可能引发“NameNotFoundException”。

try {
    String appVersion = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
}
catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}

我希望这能为将来的人简化事情