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

如果您使用的是PhoneGap，请创建自定义PhoneGa插件：

在应用程序包中创建新类：

package com.Demo; //replace with your package name

import org.json.JSONArray;

import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

import com.phonegap.api.Plugin;
import com.phonegap.api.PluginResult;
import com.phonegap.api.PluginResult.Status;

public class PackageManagerPlugin extends Plugin {

    public final String ACTION_GET_VERSION_NAME = "GetVersionName";

    @Override
    public PluginResult execute(String action, JSONArray args, String callbackId) {
        PluginResult result = new PluginResult(Status.INVALID_ACTION);
        PackageManager packageManager = this.ctx.getPackageManager();

        if(action.equals(ACTION_GET_VERSION_NAME)) {
            try {
                PackageInfo packageInfo = packageManager.getPackageInfo(
                                              this.ctx.getPackageName(), 0);
                result = new PluginResult(Status.OK, packageInfo.versionName);
            }
            catch (NameNotFoundException nnfe) {
                result = new PluginResult(Status.ERROR, nnfe.getMessage());
            }
        }

        return result;
    }
}

在plugins.xml中，添加以下行：

<plugin name="PackageManagerPlugin" value="com.Demo.PackageManagerPlugin" />

在deviceready事件中，添加以下代码：

var PackageManagerPlugin = function() {

};
PackageManagerPlugin.prototype.getVersionName = function(successCallback, failureCallback) {
    return PhoneGap.exec(successCallback, failureCallback, 'PackageManagerPlugin', 'GetVersionName', []);
};
PhoneGap.addConstructor(function() {
    PhoneGap.addPlugin('packageManager', new PackageManagerPlugin());
});

然后，您可以通过执行以下操作获取versionName属性：

window.plugins.packageManager.getVersionName(
    function(versionName) {
        //do something with versionName
    },
    function(errorMessage) {
        //do something with errorMessage
    }
);

源自这里和这里。

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;
    }
}

始终使用try-catch块：

String versionName = "Version not found";

try {
    versionName = context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionName;
    Log.i(TAG, "Version Name: " + versionName);
} catch (NameNotFoundException e) {
    // TODO Auto-generated catch block
    Log.e(TAG, "Exception Version Name: " + e.getLocalizedMessage());
}

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
                    }

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