AppUtil.java

/*
 * Copyright 2017 GcsSloop
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Last modified 2017-03-29 05:11:04
 *
 * GitHub:  https://github.com/GcsSloop
 * Website: http://www.gcssloop.com
 * Weibo:   http://weibo.com/GcsSloop
 */

package com.gcssloop.diycode.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.util.Log;

import java.util.List;

public class AppUtil {

    /**
     * 获取当前程序包名
     *
     * @param context 上下文
     * @return 程序包名
     */
    public static String getPackageName(Context context) {
        return context.getPackageName();
    }

    /**
     * 获取程序版本信息
     *
     * @param context 上下文
     * @return 版本名称
     */
    public static String getVersionName(Context context) {
        String versionName = null;
        String pkName = context.getPackageName();
        try {
            versionName = context.getPackageManager().getPackageInfo(pkName, 0).versionName;
        } catch (PackageManager.NameNotFoundException e) {
            Log.e("VersionInfo", "Exception", e);
        }
        return versionName;
    }

    /**
     * 获取程序版本号
     *
     * @param context 上下文
     * @return 版本号
     */
    public static int getVersionCode(Context context) {
        int versionCode = -1;
        String pkName = context.getPackageName();
        try {
            versionCode = context.getPackageManager().getPackageInfo(pkName, 0).versionCode;
        } catch (PackageManager.NameNotFoundException e) {
            Log.e("VersionInfo", "Exception", e);
        }
        return versionCode;
    }

    /**
     * 判断是否安装某个应用
     *
     * @param context     上下文
     * @param packageName 包名
     * @return 是否安装
     */
    public static boolean isAvailable(Context context, String packageName) {
        final PackageManager packageManager = context.getPackageManager();//获取packagemanager
        List<PackageInfo> pInfo = packageManager.getInstalledPackages(0);//获取所有已安装程序的包信息
        //从pinfo中将包名字逐一取出，压入pName list中
        if (pInfo != null) {
            for (int i = 0; i < pInfo.size(); i++) {
                String pn = pInfo.get(i).packageName;
                if (pn.equals(packageName))
                    return true;
            }
        }
        return false;
    }
}