android开发之常用工具类
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下面是本人在项目开发中收集总结的一些常用工具类，希望能帮助到各位，话不多说，直接上代码
1、Decimal数据精确计算及小数保留工具类
public class ArithDecimal { // 默认除法运算精度 private static final int DEF_DIV_SCALE = 10; // 这个类不能实例化 private ArithDecimal() { } /** * 提供精确的加法运算 * @param v1 被加数 * @param v2 加数 * @return 两个参数的和 */ public static double add(double v1, double v2) { BigDecimal b1 = new BigDecimal(Double.toString(v1)); BigDecimal b2 = new BigDecimal(Double.toString(v2)); return b1.add(b2).doubleValue(); } /** * 提供精确的减法运算 v1-v2 * @param v1 被减数 * @param v2 减数 * @return 两个参数的差 */ public static double sub(double v1, double v2) { BigDecimal b1 = new BigDecimal(Double.toString(v1)); BigDecimal b2 = new BigDecimal(Double.toString(v2)); return b1.subtract(b2).doubleValue(); } /** * 提供精确的乘法运算 * @param v1 被乘数 * @param v2 乘数 * @return 两个参数的积 */ public static double mul(double v1, double v2) { BigDecimal b1 = new BigDecimal(Double.toString(v1)); BigDecimal b2 = new BigDecimal(Double.toString(v2)); return b1.multiply(b2).doubleValue(); } /** * 提供（相对）精确的除法运算，当发生除不尽的情况时，精确到 小数点以后10位，以后的数字四舍五入 * @param v1 被除数 * @param v2 除数 * @return 两个参数的商 */ public static double div(double v1, double v2) { return div(v1, v2, DEF_DIV_SCALE); } /** * 提供（相对）精确的除法运算。当发生除不尽的情况时，由scale参数指 定精度，以后的数字四舍五入。v1/v2 * @param v1 被除数 * @param v2 除数 * @param scale 表示表示需要精确到小数点以后几位。 * @return 两个参数的商 */ public static double div(double v1, double v2, int scale) { if (scale < 0) { throw new IllegalArgumentException("The scale must be a positive integer or zero"); } if(v2 == 0.0){ return 0.0; } BigDecimal b1 = new BigDecimal(Double.toString(v1)); BigDecimal b2 = new BigDecimal(Double.toString(v2)); return b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).doubleValue(); } /** * 提供精确的小数位四舍五入处理。 * @param v 需要四舍五入的数字 * @param scale 小数点后保留几位 * @return 四舍五入后的结果 */ public static double round(double v, int scale) { if (scale < 0) { throw new IllegalArgumentException("The scale must be a positive integer or zero"); } BigDecimal b = new BigDecimal(Double.toString(v)); BigDecimal one = new BigDecimal("1"); return b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doubleValue(); } /** * 格式化小数点后面的多余的0 * @param object * @return */ public static String formatDotZero(Object object) { DecimalFormat decimalFormat = new DecimalFormat("#########.#########"); return decimalFormat.format(object); } public static String formatDouNum(Object object, Integer FDotNum) { BigDecimal b = new BigDecimal(object.toString()); return b.setScale(FDotNum, BigDecimal.ROUND_HALF_UP).toString(); } /** * 不进行四舍五入 删除多余的数 * @param v * @param scale * @returnd */ public static double round_down(double v,int scale){ if(scale<0){ throw new IllegalArgumentException( "The scale must be a positive integer or zero"); } BigDecimal b = new BigDecimal(Double.toString(v)); BigDecimal one = new BigDecimal("1"); return b.divide(one,scale,BigDecimal.ROUND_DOWN).doubleValue(); } /** * 将double类型小数点后面的都去掉,并返回字符串类型 * @param v * @return */ public static String getCount(double v){ String str = String.valueOf(v); String newStr = "--"; if(str.contains(".")){ newStr = str.substring(0,str.indexOf(".")); }else{ newStr = str; } return newStr; } /** * 保留2位小数 * @param d1 * @return */ public static String retainTwo(double d1){ DecimalFormat df = new DecimalFormat("######0.00"); return df.format(d1); }2、判断当前网络是否连接工具类
public class ConnectionUtils { /** * 获取当前网络类型 * @return 0：没有网络 1：WIFI网络 2：WAP网络 3：NET网络 */ public static final int NETTYPE_WIFI = 0x01; public static final int NETTYPE_CMWAP = 0x02; public static final int NETTYPE_CMNET = 0x03; /** * 检测网络是否可用 * @return */ public static boolean isNetworkConnected(Context context) { ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo ni = cm.getActiveNetworkInfo(); return ni != null && ni.isConnectedOrConnecting(); } public static int getNetworkType(Context context) { int netType = 0; ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); if (networkInfo == null) { return netType; } int nType = networkInfo.getType(); if (nType == ConnectivityManager.TYPE_MOBILE) { String extraInfo = networkInfo.getExtraInfo(); if (!TextUtils.isEmpty(extraInfo)) { if (extraInfo.toLowerCase().equals("cmnet")) { netType = NETTYPE_CMNET; } else { netType = NETTYPE_CMWAP; } } } else if (nType == ConnectivityManager.TYPE_WIFI) { netType = NETTYPE_WIFI; } return netType; } public static void setNetType(Context context) { AppState.netState = getNetworkType(context); } public static boolean isNetworkAvailable(Context context) { ConnectivityManager connectivity = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity != null) { NetworkInfo info = connectivity.getActiveNetworkInfo(); if (info != null && info.isConnected()) { // 当前网络是连接的 if (info.getState() == NetworkInfo.State.CONNECTED) { // 当前所连接的网络可用 return true; } } } return false; }}3、日期获取及转化工具类
public class DateUtils { private static String TAG = "DateUtils"; public static String[] weekName = {"日", "一", "二", "三", "四", "五", "六"}; public final static String CALENDAR_DATA_TIME = "MM/dd-HH:mm"; public final static String CALENDAR_TIME = "HH:mm"; public final static String CALENDAR_YEAR_DATA = "yyyy/MM/dd"; public final static String CALENDAR_DATA = "MM/dd"; public final static String CALENDAR_YEAR_MONTH = "yyyy/MM"; private static SimpleDateFormat dateFormat1 = new SimpleDateFormat( "yyyy-MM-dd HH:mm"); private static SimpleDateFormat dateFormat2 = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); private static SimpleDateFormat dateFormat3 = new SimpleDateFormat( "yyyy/MM/dd HH:mm:ss"); //输入年月得到月份天数 public static int getMonthDays(int year, int month) { if (month > 12 || month < 1) { LogUtils.v(TAG, "date error"); return 0; } int[] arr = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int days = 0; if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) { arr[1] = 29; // 闰年2月29天 } days = arr[month - 1]; return days; } public static int getYear() { return Calendar.getInstance().get(Calendar.YEAR); } public static int getMonth() { return Calendar.getInstance().get(Calendar.MONTH) + 1; } public static int getDate() { return Calendar.getInstance().get(Calendar.DATE) ; } public static int getCurrentMonthDay() { return Calendar.getInstance().get(Calendar.DAY_OF_MONTH); } public static int getWeekDay() { return Calendar.getInstance().get(Calendar.DAY_OF_WEEK); } public static int getHour() { return Calendar.getInstance().get(Calendar.HOUR_OF_DAY); } public static int getMinute() { return Calendar.getInstance().get(Calendar.MINUTE); } /** * 通过日期获得星期几 * * @param year * @param month * @param date * @return */ public static String getWeekOfDate(int year, int month, int date) { Calendar time = Calendar.getInstance(); time.clear(); time.set(Calendar.YEAR, year); //year 为 int time.set(Calendar.MONTH, month - 1);//注意,Calendar对象默认一月为0 time.set(Calendar.DATE, date);//注意,Calendar对象默认一月为0 Calendar cal = Calendar.getInstance(); Date dates = cal.getTime(); return getWeekOfDate(dates); } public static String getWeekOfDate(Date dt) { // String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", // "星期六"}; Calendar cal = Calendar.getInstance(); cal.setTime(dt); int w = cal.get(Calendar.DAY_OF_WEEK) - 1; if (w < 0) w = 0; return weekName[w]; } /** * 取不同格式的当前时间 * @return yyyyMMdd */ public static String getStrDate() { SimpleDateFormat da = new SimpleDateFormat("yyyyMMdd"); return da.format(new Date()); } public static String getTime() { SimpleDateFormat da = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return da.format(new Date()); } public static String getOrderTime() { SimpleDateFormat da = new SimpleDateFormat("HH:mm:ss"); return da.format(new Date()); } public static String getOrderDate(){ SimpleDateFormat da = new SimpleDateFormat("yyyy-MM-dd"); return da.format(new Date()); } public static int getWeekOfDateintForYMDInt(int year, int month, int date) { Calendar time = Calendar.getInstance(); time.clear(); time.set(Calendar.YEAR, year); //year 为 int time.set(Calendar.MONTH, month - 1);//注意,Calendar对象默认一月为0 time.set(Calendar.DATE, date);//注意,Calendar对象默认一月为0 Date dates = time.getTime(); return getWeekOfDateint(dates); } public static int getWeekOfDateint(Date dt) { Calendar cal = Calendar.getInstance(); cal.setTime(dt); int w = cal.get(Calendar.DAY_OF_WEEK) - 1; if (w < 0) w = 0; return w; } //日期String格式转换成long类型格式 public static long getLongDate(String date){ //将字符串类型转化成Date类型 //String date="2009-08-04 14:37:47"; if(date.equals("")){ return 0; } SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date d2=null; long t3 = 0; try { d2=sdf.parse(date);//将String to Date类型 t3=d2.getTime(); } catch (ParseException e) { e.printStackTrace(); } return t3; } //Date转String public static String parseDateToString(Date date){ DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return df.format(date); } //long类型转换成date格式 public static String getDateDate(long date){ SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //前面的date如果是秒数，就要先乘1000得到毫秒数，再转为java.util.Date类型 java.util.Date dt = new Date(date); String sDateTime = sdf.format(dt); //得到精确到秒的表示 return sDateTime; } //long转Calendar public static Calendar parseLongToCalendar(long date){ SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd"); java.util.Date dt = new Date(date); Calendar calendar = Calendar.getInstance(); calendar.setTime(dt); return calendar; } /** * 将calendar的时间转换为 yyyy-MM-dd HH:mm:ss格式的string时间 * @param calendar * @return */ public static String parseCalendarToString(Calendar calendar) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); return dateFormat.format(calendar.getTime()); } /** * 将calendar的时间转换为 pattern 指定格式的string时间 * * @param calendar * @return */ public static String parseCalendarToString(Calendar calendar, String pattern) { SimpleDateFormat dateFormat = new SimpleDateFormat(pattern); return dateFormat.format(calendar.getTime()); } /** * 将calendar的时间转换为string时间 * * @CALENDAR_DATA MM/dd * @CALENDAR_YEAR_DATA yyyy/MM/dd * @CALENDAR_TIME HH:mm * @CALENDAR_DATA_TIME MM/dd-HH:mm * @CALENDAR_YEAR_MONTH yyyy/MM */ public static String parseCalendarToStringByType(String type,Calendar calendar) { if (type == null || type.equals("")) return null; if (calendar == null) return null; SimpleDateFormat dateFormat = new SimpleDateFormat(type); return dateFormat.format(calendar.getTime()); } /** * 取当前时间 * @return yyyyMMdd */ public static String getCurrDate() { SimpleDateFormat da = new SimpleDateFormat("yyyyMMdd"); return da.format(new Date()); } /** * 将String字符串的时间转换为Calendar * * @param dateTime * @return Calendar的时间 */ public static Calendar parseStringToCalendar(String dateTime) { Calendar calendar = null; try { // "^(\\d{4})-([0-1]\\d)-([0-3]\\d)\\s([0-5]\\d):([0-5]\\d):([0-5]\\d)$"; // String regex2 = "^\\d{4}(\\-|\\/|\\.)\\d{1,2}\\1\\d{1,2}$"; String regex1 = "^[1-9]\\d{3}\\-(0?[1-9]|1[0-2])\\-(0?[1-9]|[12]\\d|3[01])\\s*(0?[0-9]|1\\d|2[0-3])(\\:(0?[0-9]|[1-5]\\d)){2}$"; String regex2 = "^[1-9]\\d{3}\\-(0?[1-9]|1[0-2])\\-(0?[1-9]|[12]\\d|3[01])\\s*(0?[0-9]|1\\d|2[0-3])(\\:(0?[0-9]|[1-5]\\d)){1}$"; String regex3 = "^[1-2][0-9][0-9][0-9]-([1][0-2]|0?[1-9])-([12][0-9]|3[01]|0?[1-9])\\s*([01][0-9]|[2][0-3])$"; String regex4 = "^[1-9]\\d{3}\\-(0?[1-9]|1[0-2])\\-(0?[1-9]|[12]\\d|3[01])$"; String regex5 = "^[1-9]\\d{3}\\/(0?[1-9]|1[0-2])\\/(0?[1-9]|[12]\\d|3[01])\\s*(0?[0-9]|1\\d|2[0-3])(\\:(0?[0-9]|[1-5]\\d)){2}$"; String regex6 = "^[1-9]\\d{3}\\/(0?[1-9]|1[0-2])\\/(0?[1-9]|[12]\\d|3[01])\\s*(0?[0-9]|1\\d|2[0-3])(\\:(0?[0-9]|[1-5]\\d)){1}$"; String regex7 = "^[1-2][0-9][0-9][0-9]/([1][0-2]|0?[1-9])/([12][0-9]|3[01]|0?[1-9])\\s*([01][0-9]|[2][0-3])$"; String regex8 = "^[1-9]\\d{3}\\/(0?[1-9]|1[0-2])\\/(0?[1-9]|[12]\\d|3[01])$"; // yyyy-MM-dd HH:mm:ss格式的正则匹配 if (dateTime.trim().matches(regex1)) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } if (dateTime.trim().matches(regex2)) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } if (dateTime.trim().matches(regex3)) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd HH"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } if (dateTime.trim().matches(regex4)) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } if (dateTime.trim().matches(regex5)) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy/MM/dd HH:mm:ss"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } if (dateTime.trim().matches(regex6)) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy/MM/dd HH:mm"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } if (dateTime.trim().matches(regex7)) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy/MM/dd HH"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } if (dateTime.trim().matches(regex8)) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd"); Date date = dateFormat.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } return calendar; } catch (Exception e) { return null; } } /** * 将String字符串的时间转换为Calendar * * @param dateTime * @return Calendar的时间 */ public static Calendar parseStringToCalendarForChart(String dateTime) { Calendar calendar = null; try { if (!Utils.isEmpty(dateTime)) { String[] arr = dateTime.split(":"); if (dateTime.trim().length() <= 16 && arr.length <= 2) { //SimpleDateFormat dateFormat = new SimpleDateFormat( // "yyyy-MM-dd HH:mm"); Date date = dateFormat1.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } else { if (dateTime.indexOf('-') != -1) { //SimpleDateFormat dateFormat = new SimpleDateFormat( // "yyyy-MM-dd HH:mm:ss"); Date date = dateFormat2.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } else if (dateTime.indexOf('/') != -1) { //SimpleDateFormat dateFormat = new SimpleDateFormat( // "yyyy/MM/dd HH:mm:ss"); Date date = dateFormat3.parse(dateTime); calendar = Calendar.getInstance(); calendar.setTime(date); } } } return calendar; } catch (Exception e) { return null; } }}4、屏幕像素密度工具类
public class DensityUtil { /** * 根据手机的分辨率从 dp 的单位 转成为 px(像素) */ public static int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } /** * 根据手机的分辨率从 px(像素) 的单位 转成为 dp */ public static int px2dip(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); } public static int getWindowHeight(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); return wm.getDefaultDisplay().getHeight(); } public static int getWindowWeight(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); return wm.getDefaultDisplay().getWidth(); }}5、正在加载中对话框工具类
public class LoadingDialogUtils { ProgressDialog dialog; public LoadingDialogUtils(Context context) { dialog = new ProgressDialog(context); } public void showLoadingDialog(String msg1, String msg2) { if (dialog.isShowing()) return; dialog.setMessage(msg2); dialog.setTitle(msg1); dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);// 设置进度条的形式为圆形转动的进度条 dialog.setCancelable(true);// 设置是否可以通过点击Back键取消 dialog.setCanceledOnTouchOutside(true);// 设置在点击Dialog外是否取消Dialog进度条 dialog.show(); LogUtils.v(this.toString(), "show Dialog"); } public void disMissDialog() { LogUtils.v(this.toString(), "cancel dialog"); if(dialog.isShowing()){ dialog.cancel(); } }}6、log打印工具类
public class LogUtils { private static final String TAG = "LogUtils"; // 发布时改false private static final boolean LOGGER = true; public static void v(String tag, Object msg) { if (LOGGER) { Log.v(TAG, tag + "-->" + msg); } } public static void d(String tag, Object msg) { if (LOGGER) { Log.d(TAG, tag + "-->" + msg); } } public static void i(String tag, Object msg) { if (LOGGER) { Log.i(TAG, tag + "-->" + msg); } } public static void i(Object msg) { if (LOGGER) { Log.i("test", tag + "-->" + msg); } } public static void w(String tag, Object msg) { if (LOGGER) { Log.v(TAG, tag + "-->" + msg); } } public static void e(String tag, Object msg) { if (LOGGER) { Log.e(TAG, tag + "-->" + msg); } } public static void e(String tag, Object msg, Throwable tr) { if (LOGGER) { Log.e(TAG, tag + "-->" + msg); } } public static void e( Object msg) { if (LOGGER) { Log.e(TAG, tag + "-->" + msg); } } /** * log打印数据量较大的时候使用 * @param tag * @param res */ public static void bigData(String tag,String res){ if(LOGGER){ if (res.length() > 3000) { Log.v(TAG, tag+"-->length == " + res.length()); int chunkCount = res.length() / 3000; // integer division for (int i = 0; i <= chunkCount; i++) { int max = 3000 * (i + 1); if (max >= res.length()) { Log.v(TAG, "chunk " + i + " of " + chunkCount + "-->" + res.substring(3000 * i)); } else { Log.v(TAG, "chunk " + i + " of " + chunkCount + "-->" + res.substring(3000 * i, max)); } } } else { Log.v(TAG, tag + "-->" + res.toString()); } } }}7、sharedPreferences工具类
public class SPrefUtils { /** * 保存在手机里面的文件名 */ public static final String FILE_NAME = "share_data"; /** * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法 * * @param context * @param key * @param object */ public static void put(Context context, String key, Object object) { if(context==null || key==null || object==null){ return; } SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); if (object instanceof String) { editor.putString(key, (String) object); } else if (object instanceof Integer) { editor.putInt(key, (Integer) object); } else if (object instanceof Boolean) { editor.putBoolean(key, (Boolean) object); } else if (object instanceof Float) { editor.putFloat(key, (Float) object); } else if (object instanceof Long) { editor.putLong(key, (Long) object); } else { editor.putString(key, object.toString()); } SharedPreferencesCompat.apply(editor); } /** * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值 * * @param context * @param key * @param * @return */ public static Object get(Context context, String key, Object defaultObject) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); if (defaultObject instanceof String) { return sp.getString(key, (String) defaultObject); } else if (defaultObject instanceof Integer) { return sp.getInt(key, (Integer) defaultObject); } else if (defaultObject instanceof Boolean) { return sp.getBoolean(key, (Boolean) defaultObject); } else if (defaultObject instanceof Float) { return sp.getFloat(key, (Float) defaultObject); } else if (defaultObject instanceof Long) { return sp.getLong(key, (Long) defaultObject); } return null; } public static String get(Context context, String key) { if(context==null || key==null){ return null; } SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.getString(key, null); } public static Boolean getBoolean(Context context, String key) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.getBoolean(key, false); } /** * 移除某个key值已经对应的值 * * @param context * @param key */ public static void remove(Context context, String key) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.remove(key); SharedPreferencesCompat.apply(editor); } /** * 清除所有数据 * * @param context */ public static void clear(Context context) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.clear(); SharedPreferencesCompat.apply(editor); } /** * 查询某个key是否已经存在 * * @param context * @param key * @return */ public static boolean contains(Context context, String key) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.contains(key); } /** * 返回所有的键值对 * * @param context * @return */ public static Map<String, ?> getAll(Context context) { SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE); return sp.getAll(); } /** * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类 * * @author zhy */ private static class SharedPreferencesCompat { private static final Method sApplyMethod = findApplyMethod(); /** * 反射查找apply的方法 * * @return */ @SuppressWarnings({"unchecked", "rawtypes"}) private static Method findApplyMethod() { try { Class clz = SharedPreferences.Editor.class; return clz.getMethod("apply"); } catch (NoSuchMethodException e) { } return null; } /** * 如果找到则使用apply执行，否则使用commit * * @param editor */ public static void apply(SharedPreferences.Editor editor) { try { if (sApplyMethod != null) { sApplyMethod.invoke(editor); return; } } catch (IllegalArgumentException e) { } catch (IllegalAccessException e) { } catch (InvocationTargetException e) { } editor.commit(); } }}8、Toast工具类
public final class ToastUtil { // App生命周期中唯一Context，CrashApplication继承Application private static Context mContext = BaseApp.getInstance(); // 全局的toast实例 private static Toast mToast; // 短时间显示toast public static void showShort(String text) { if (mContext == null) { mContext = BaseApp.getInstance(); } if (mToast == null) { mToast = Toast.makeText(mContext, text, Toast.LENGTH_SHORT); } mToast.setText(text); mToast.setDuration(Toast.LENGTH_SHORT); mToast.show(); } public static void showShort(int resId) { if (mContext == null) { mContext = BaseApp.getInstance(); } if (mToast == null) { mToast = Toast.makeText(mContext, resId, Toast.LENGTH_SHORT); } mToast.setText(resId); mToast.setDuration(Toast.LENGTH_SHORT); mToast.show(); } // 长时间显示toast public static void showLong(String text) { if (mContext == null) { mContext = BaseApp.getInstance(); } if (mToast == null) { mToast = Toast.makeText(mContext, text, Toast.LENGTH_LONG); } mToast.setText(text); mToast.setDuration(Toast.LENGTH_LONG); mToast.show(); } public static void showLong(int resId) { if (mContext == null) { mContext = BaseApp.getInstance(); } if (mToast == null) { mToast = Toast.makeText(mContext, resId, Toast.LENGTH_LONG); } mToast.setText(resId); mToast.setDuration(Toast.LENGTH_LONG); mToast.show(); }} 0 0
- android开发之常用工具类
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- Android开发常用工具类
- Android开发常用工具类
- Android开发常用工具类
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- Android开发常用工具类
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