AppUtils获取版本号等（转的他人的）

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package com.anew.note.utils;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;

import java.io.File;
import java.util.List;

/**
* Created by starry on 2016/8/2.
*/
public class AppUtils {

private AppUtils() {    throw new UnsupportedOperationException("cannot be instantiated");}/** * 安装指定路径下的Apk */public static void installApk(Activity activity, String filePath, int requsetCode) {    Intent intent = new Intent();    intent.setAction("android.intent.action.VIEW");    intent.addCategory("android.intent.category.DEFAULT");    intent.setDataAndType(Uri.fromFile(new File(filePath)), "application/vnd.android.package-archive");    activity.startActivityForResult(intent, requsetCode);}/** * 卸载指定包名的App */public static void uninstallApp(Activity activity, String packageName, int requsetCode) {    Intent intent = new Intent();    intent.setAction("android.intent.action.DELETE");    intent.addCategory("android.intent.category.DEFAULT");    intent.setData(Uri.parse("package:" + packageName));    activity.startActivityForResult(intent, requsetCode);}/** * 获取App名称 */public static String getAppName(Context context) {    try {        PackageManager packageManager = context.getPackageManager();        PackageInfo packageInfo = packageManager.getPackageInfo(                context.getPackageName(), 0);        int labelRes = packageInfo.applicationInfo.labelRes;        return context.getResources().getString(labelRes);    } catch (PackageManager.NameNotFoundException e) {        e.printStackTrace();    }    return null;}/** * 获取当前App版本号 */public static String getVersionName(Context context) {    String versionName = null;    PackageManager pm = context.getPackageManager();    PackageInfo info = null;    try {        info = pm.getPackageInfo(context.getApplicationContext().getPackageName(), 0);    } catch (PackageManager.NameNotFoundException e) {        e.printStackTrace();    }    if (info != null) {        versionName = info.versionName;    }    return versionName;}/** * 获取当前App版本Code */public static int getVersionCode(Context context) {    int versionCode = 0;    PackageManager pm = context.getPackageManager();    PackageInfo info = null;    try {        info = pm.getPackageInfo(context.getApplicationContext().getPackageName(), 0);    } catch (PackageManager.NameNotFoundException e) {        e.printStackTrace();    }    if (info != null) {        versionCode = info.versionCode;    }    return versionCode;}/** * 打开指定包名的App */public static void openOtherApp(Activity activity, String packageName) {    PackageManager manager = activity.getPackageManager();    Intent launchIntentForPackage = manager.getLaunchIntentForPackage(packageName);    if (launchIntentForPackage != null) {        activity.startActivity(launchIntentForPackage);    }}/** * 打开指定包名的App应用信息界面 */public static void showAppInfo(Activity activity, String packageName) {    Intent intent = new Intent();    intent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");    intent.setData(Uri.parse("package:" + packageName));    activity.startActivity(intent);}/** * 分享Apk信息 */public static void shareApkInfo(Activity activity, String info) {    Intent intent = new Intent();    intent.setAction("android.intent.action.SEND");    intent.addCategory("android.intent.category.DEFAULT");    intent.setType("text/plain");    intent.putExtra(Intent.EXTRA_TEXT, info);    activity.startActivity(intent);}/** * 判断当前App处于前台还是后台 * 需添加<uses-permission android:name="android.permission.GET_TASKS"/> * 并且必须是系统应用该方法才有效 */public static boolean isApplicationBackground(final Context context) {    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);    @SuppressWarnings("deprecation")    List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);    if (!tasks.isEmpty()) {        ComponentName topActivity = tasks.get(0).topActivity;        if (!topActivity.getPackageName().equals(context.getPackageName())) {            return true;        }    }    return false;}

}

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