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。

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。

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();
}

Use:

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

您可以使用以下命令获取版本代码

int verCode = pInfo.versionCode;

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

Kotlin示例：

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.act_signin)

    packageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES).apply {
        findViewById<TextView>(R.id.text_version_name).text = versionName
        findViewById<TextView>(R.id.text_version_code).text =
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) "$longVersionCode" else "$versionCode"
    }

    packageManager.getApplicationInfo(packageName, 0).apply{
        findViewById<TextView>(R.id.text_build_date).text =
            SimpleDateFormat("yy-MM-dd hh:mm").format(java.io.File(sourceDir).lastModified())
    }
}