N个非常有用的Android程序片段（持续更新）
16lz
2021-01-23
1.判断网络是否已经连接
// check all network connect, WIFI or mobilepublic static boolean isNetworkAvailable(final Context context) { boolean hasWifoCon = false; boolean hasMobileCon = false; ConnectivityManager cm = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE); NetworkInfo[] netInfos = cm.getAllNetworkInfo(); for (NetworkInfo net : netInfos) { String type = net.getTypeName(); if (type.equalsIgnoreCase("WIFI")) { LevelLogUtils.getInstance().i(tag, "get Wifi connection"); if (net.isConnected()) { hasWifoCon = true; } } if (type.equalsIgnoreCase("MOBILE")) { LevelLogUtils.getInstance().i(tag, "get Mobile connection"); if (net.isConnected()) { hasMobileCon = true; } } } return hasWifoCon || hasMobileCon;}2.Android的Px与Dp转化工具类
public class DensityUtils { public static int Dp2Px(Context context, float dp) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dp * scale + 0.5f); } public static int Px2Dp(Context context, float px) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (px / scale + 0.5f); } }3.Android获得WIFI IP地址或者手机网络IP
有的时候我们需要获得WIFI的IP地址获得手机网络的IP地址，这是一个工具类，专门解决这个问题，这里需要两个权限：
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" > </uses-permission> <uses-permission android:name="android.permission.INTERNET" > </uses-permission>第一个权限是获得WIFI的IP地址需要使用的，第二个权限是获得移动网络的IP需要使用的，代码如下：
public class GetIPAddressUtil { public static String getWifiIP(Context context) { String ip = null; WifiManager wifiManager = (WifiManager) context .getSystemService(Context.WIFI_SERVICE); if (wifiManager.isWifiEnabled()) { WifiInfo wifiInfo = wifiManager.getConnectionInfo(); int i = wifiInfo.getIpAddress(); ip = (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + (i >> 24 & 0xFF); } return ip; } public static String getMobileIP() { try { for (Enumeration<NetworkInterface> en = NetworkInterface .getNetworkInterfaces(); en.hasMoreElements();) { NetworkInterface intf = en.nextElement(); for (Enumeration<InetAddress> enumIpAddr = intf .getInetAddresses(); enumIpAddr.hasMoreElements();) { InetAddress inetAddress = enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); } } } } catch (SocketException ex) { Log.e("哎呀，出错了...", ex.toString()); } return null; }}4.唤醒屏幕并解锁
public static void wakeUpAndUnlock(Context context){ KeyguardManager km= (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE); KeyguardManager.KeyguardLock kl = km.newKeyguardLock("unLock"); //解锁 kl.disableKeyguard(); //获取电源管理器对象 PowerManager pm=(PowerManager) context.getSystemService(Context.POWER_SERVICE); //获取PowerManager.WakeLock对象,后面的参数|表示同时传入两个值,最后的是LogCat里用的Tag PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK,"bright"); //点亮屏幕 wl.acquire(); //释放 wl.release(); }需要添加权限
<uses-permission android:name="android.permission.WAKE_LOCK" /><uses-permission android:name="android.permission.DISABLE_KEYGUARD" />5.判断当前App处于前台还是后台状态
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; }需要添加权限
<uses-permission android:name="android.permission.GET_TASKS" />6.安装APK
public static void installApk(Context context, File file) { Intent intent = new Intent(); intent.setAction("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.setType("application/vnd.android.package-archive"); intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive"); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(intent);}7.获取当前设备宽高，单位px
@SuppressWarnings("deprecation")public static int getDeviceWidth(Context context) { WindowManager manager = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); return manager.getDefaultDisplay().getWidth();}@SuppressWarnings("deprecation")public static int getDeviceHeight(Context context) { WindowManager manager = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); return manager.getDefaultDisplay().getHeight();}8.获取当前设备的MAC地址
public static String getMacAddress(Context context) { String macAddress; WifiManager wifi = (WifiManager) context .getSystemService(Context.WIFI_SERVICE); WifiInfo info = wifi.getConnectionInfo(); macAddress = info.getMacAddress(); if (null == macAddress) { return ""; } macAddress = macAddress.replace(":", ""); return macAddress;}9.获取当前程序的版本号
public static String getAppVersion(Context context) { String version = "0"; try { version = context.getPackageManager().getPackageInfo( context.getPackageName(), 0).versionName; } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return version;}10.返回移动网络运营商的名字
(例：中国联通、中国移动、中国电信) 仅当用户已在网络注册时有效, CDMA 可能会无效)
public static String getNetworkOperatorName(Context context) { TelephonyManager telephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); return telephonyManager.getNetworkOperatorName(); }11.手机号码正则
public static final String REG_PHONE_CHINA = "^((13[0-9])|(15[^4,\\D])|(18[0,5-9]))\\d{8}$";12.邮箱正则
public static final String REG_EMAIL = "\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";更多相关文章
- Android判断是否有可用网络和判断WIFI是否ON
- Android http 网络框架对比
- Android中的http网络通信基础点
- [置顶] Android网络请求框架NoHttp简介
- Android网络编程之——Android登录系统模块的实现(客户端+服务器
- Android网络状态相关
- Android中使用代码控制Wifi及数据连接网络开关