34 Android 简单版本信息封装

package com.example.android_apk_install;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
/**
 * 版本信息
 * @author Administrator
 *
 */
public class PackageUtils {
	private Context context;
	private PackageManager manager;
	private PackageInfo info;

	public PackageUtils(Context context) {
		this.context = context;
		init();
	}

	/**
	 * 初始化数据
	 */
	public void init() {
		manager = context.getPackageManager();
		try {
			info = manager.getPackageInfo(context.getPackageName(),
					PackageManager.GET_ACTIVITIES);

		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}

	}
	
	public int getVersionCode()
	{
		return info.versionCode;
	}
	/**
	 * 
	 * @return
	 */
	public String getVersionName()
	{
		return info.versionName;
	}
	/**
	 * 是否需要升级
	 * @param oldVersion
	 * @param newVersion
	 * @return
	 */
	public boolean isUpgrada(int oldVersion,int newVersion)
	{
		boolean flag = false;
		flag = newVersion > oldVersion ? true : false;
		return flag;
	}
}

测试

package com.example.android_apk_install;

import android.os.Bundle;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.view.Menu;
import android.widget.Toast;

public class MainActivity extends Activity {

	PackageUtils utils;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		utils=new PackageUtils(this);
		int currVersionCode=utils.getVersionCode();
		boolean flag=utils.isUpgrada(currVersionCode, 2);
		if (flag) {
			Toast.makeText(this, "有新版本", 1).show();
		}
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}