Android实用代码片段(二)

1、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(); 
    }

2、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;
    }
    权限：
<uses-permission android:name="android.permission.GET_TASKS" />

3、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;
}

4、是否有SD卡：

public static boolean haveSDCard() {
return android.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED);
    }

5、主动回到Home，后台运行：

public static void goHome(Context context) {
        Intent mHomeIntent = new Intent(Intent.ACTION_MAIN);
        mHomeIntent.addCategory(Intent.CATEGORY_HOME);
        mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
        context.startActivity(mHomeIntent);
    }

6、获取状态栏高度：

注意，要在onWindowFocusChanged中调用，在onCreate中获取高度为0
@TargetApi(Build.VERSION_CODES.CUPCAKE)
public static int getStatusBarHeight(Activity activity) {
    Rect frame = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        return frame.top;
    }

7、判断手机连接的网络类型(2G,3G,4G)：

联通的3G为UMTS或HSDPA，移动和联通的2G为GPRS或EGDE，电信的2G为CDMA，电信的3G为EVDO
public class Constants {
    /** * Unknown network class */
    public static final int NETWORK_CLASS_UNKNOWN = 0;

    /** * wifi net work */
    public static final int NETWORK_WIFI = 1;

    /** * "2G" networks */
    public static final int NETWORK_CLASS_2_G = 2;

    /** * "3G" networks */
    public static final int NETWORK_CLASS_3_G = 3;

    /** * "4G" networks */
    public static final int NETWORK_CLASS_4_G = 4;

}

public static int getNetWorkClass(Context context) {
        TelephonyManager telephonyManager = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);

        switch (telephonyManager.getNetworkType()) {
        case TelephonyManager.NETWORK_TYPE_GPRS:
        case TelephonyManager.NETWORK_TYPE_EDGE:
        case TelephonyManager.NETWORK_TYPE_CDMA:
        case TelephonyManager.NETWORK_TYPE_1xRTT:
        case TelephonyManager.NETWORK_TYPE_IDEN:
            return Constants.NETWORK_CLASS_2_G;

        case TelephonyManager.NETWORK_TYPE_UMTS:
        case TelephonyManager.NETWORK_TYPE_EVDO_0:
        case TelephonyManager.NETWORK_TYPE_EVDO_A:
        case TelephonyManager.NETWORK_TYPE_HSDPA:
        case TelephonyManager.NETWORK_TYPE_HSUPA:
        case TelephonyManager.NETWORK_TYPE_HSPA:
        case TelephonyManager.NETWORK_TYPE_EVDO_B:
        case TelephonyManager.NETWORK_TYPE_EHRPD:
        case TelephonyManager.NETWORK_TYPE_HSPAP:
            return Constants.NETWORK_CLASS_3_G;

        case TelephonyManager.NETWORK_TYPE_LTE:
            return Constants.NETWORK_CLASS_4_G;

        default:
            return Constants.NETWORK_CLASS_UNKNOWN;
        }
    }

8、px-sp转换：

public static int px2sp(Context context, float pxValue) {
        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (pxValue / fontScale + 0.5f);
    }

public static int sp2px(Context context, float spValue) {
        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue * fontScale + 0.5f);
    }

9、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}$";

10、邮箱正则：

public static final String REG_EMAIL = "\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";