檢視軟件版本, PackageInfo.versionCode 和 PackageInfo.versionName

許多時應用軟件都提供一個About Me選項, 從而檢視軟件版本.



在Android可以使用下面程序代碼:
PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
myVersionCode = packageInfo.versionCode;
myVersionName = packageInfo.versionName;

返回的數據是AndroidManifest.xml文件中定義的android:versionCode和android:versionName.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<TextView  
 android:id="@+id/version"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

AndroidCheckVersion.java

package com.AndroidCheckVersion;

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

public class AndroidCheckVersion extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        TextView version = (TextView)findViewById(R.id.version);
        
        int myVersionCode;
  String myVersionName;
  
  try {
   PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
   myVersionCode = packageInfo.versionCode;
   myVersionName = packageInfo.versionName;
  } catch (NameNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   myVersionCode = 0;  //dummy
   myVersionName = "";  //dummy
  }
  
  String myVersion = (
    "\n"
    + "Version Code: " + String.valueOf(myVersionCode) + "\n"
    + "Version Name: " + myVersionName + "\n");
  
  version.setText(myVersion);
    }
}