Android常用小功能

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在做android开发过程中，会有些公共的部分是常用到的，比如，检测手机是否联网，手机中是否有内存卡，当前手机号码等等信息。今天，我们简单总结一下，几个比较常用的小功能，并且贴上代码。

1、检测是否有手机卡

public static boolean existSDcard() {if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment.getExternalStorageState())) {return true;} elsereturn false;}

2、获取到当前手机号码

/*         * 获取当前的手机号         */        public String getLocalNumber() {                TelephonyManager tManager = (TelephonyManager) this                                .getSystemService(TELEPHONY_SERVICE);                String number = tManager.getLine1Number();；                return number;        }

3、当前网络连接状态

/**      * 判断当前网络连接状态      * @param context      * @return      */      public static boolean isNetworkConnected(Context context) {          NetworkInfo networkInfo = ((ConnectivityManager) context                  .getApplicationContext().getSystemService("connectivity"))                  .getActiveNetworkInfo();          if (networkInfo != null) {              return networkInfo.isConnectedOrConnecting();          }          return false;      }

4、应用是否安装在手机上

/**     * 判断该应用是否安装在手机上     * @param packageName  要判断应用的包名     */    private boolean checkAPK(String packageName) {        List<PackageInfo> pakageinfos = getPackageManager().getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);        for (PackageInfo pi : pakageinfos) {            String pi_packageName = pi.packageName;            if(packageName.endsWith(pi_packageName)){                return true;            }        }        return false;    }

5、获取apk包的签名信息

这是获取apk包的签名信息private String getSign(Context context) {  PackageManager pm = context.getPackageManager();  List<PackageInfo> apps = pm.getInstalledPackages(PackageManager.GET_SIGNATURES);  Iterator<PackageInfo> iter = apps.iterator();  while(iter.hasNext()) {       PackageInfo packageinfo = iter.next();       String packageName = packageinfo.packageName;              return packageinfo.signatures[0].toCharsString();       if (packageName.equals(instance.getPackageName())) {          MediaApplication.logD(DownloadApk.class, packageinfo.signatures[0].toCharsString());          return packageinfo.signatures[0].toCharsString();       }}  return null;}

6、检测是否联网

public boolean checkInternet() {        ConnectivityManager cm = (ConnectivityManager) this                .getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo info = cm.getActiveNetworkInfo();        if (info != null && info.isConnected()) {            // 能连接Internet            return true;        } else {            // 不能连接到            return false;        }    }

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