Android的常用代码片段
2018-07-20 来源：open-open
px-dp转换
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
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);
}
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}$";
邮箱正则
public static final String REG_EMAIL = "\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";
时间
// 把一个毫秒数转化成时间字符串
// 格式为小时/分/秒/毫秒（如：24903600 –> 06小时55分03秒600毫秒）
/**
* @param millis
* 要转化的毫秒数。
* @param isWhole
* 是否强制全部显示小时/分/秒/毫秒。
* @param isFormat
* 时间数字是否要格式化，如果true：少位数前面补全；如果false：少位数前面不补全。
* @return 返回时间字符串：小时/分/秒/毫秒的格式（如：24903600 --> 06小时55分03秒600毫秒）。
*/
public static String millisToString(long millis, boolean isWhole, boolean isFormat) {
String h = "";
String m = "";
String s = "";
String mi = "";
if (isWhole) {
h = isFormat ? "00小时" : "0小时";
m = isFormat ? "00分" : "0分";
s = isFormat ? "00秒" : "0秒";
mi = isFormat ? "00毫秒" : "0毫秒";
}
long temp = millis;
long hper = 60 * 60 * 1000;
long mper = 60 * 1000;
long sper = 1000;
if (temp / hper > 0) {
if (isFormat) {
h = temp / hper < 10 ? "0" + temp / hper : temp / hper + "";
} else {
h = temp / hper + "";
}
h += "小时";
}
temp = temp % hper;
if (temp / mper > 0) {
if (isFormat) {
m = temp / mper < 10 ? "0" + temp / mper : temp / mper + "";
} else {
m = temp / mper + "";
}
m += "分";
}
temp = temp % mper;
if (temp / sper > 0) {
if (isFormat) {
s = temp / sper < 10 ? "0" + temp / sper : temp / sper + "";
} else {
s = temp / sper + "";
}
s += "秒";
}
temp = temp % sper;
mi = temp + "";
if (isFormat) {
if (temp < 100 && temp >= 10) {
mi = "0" + temp;
}
if (temp < 10) {
mi = "00" + temp;
}
}
mi += "毫秒";
return h + m + s + mi;
}
// 格式为小时/分/秒/毫秒（如：24903600 –> 06小时55分03秒）。
/**
*
* @param millis
* 要转化的毫秒数。
* @param isWhole
* 是否强制全部显示小时/分/秒/毫秒。
* @param isFormat
* 时间数字是否要格式化，如果true：少位数前面补全；如果false：少位数前面不补全。
* @return 返回时间字符串：小时/分/秒/毫秒的格式（如：24903600 --> 06小时55分03秒）。
*/
public static String millisToStringMiddle(long millis, boolean isWhole, boolean isFormat) {
return millisToStringMiddle(millis, isWhole, isFormat, "小时", "分钟", "秒");
}
public static String millisToStringMiddle(long millis, boolean isWhole, boolean isFormat, String hUnit, String mUnit, String sUnit) {
String h = "";
String m = "";
String s = "";
if (isWhole) {
h = isFormat ? "00" + hUnit : "0" + hUnit;
m = isFormat ? "00" + mUnit : "0" + mUnit;
s = isFormat ? "00" + sUnit : "0" + sUnit;
}
long temp = millis;
long hper = 60 * 60 * 1000;
long mper = 60 * 1000;
long sper = 1000;
if (temp / hper > 0) {
if (isFormat) {
h = temp / hper < 10 ? "0" + temp / hper : temp / hper + "";
} else {
h = temp / hper + "";
}
h += hUnit;
}
temp = temp % hper;
if (temp / mper > 0) {
if (isFormat) {
m = temp / mper < 10 ? "0" + temp / mper : temp / mper + "";
} else {
m = temp / mper + "";
}
m += mUnit;
}
temp = temp % mper;
if (temp / sper > 0) {
if (isFormat) {
s = temp / sper < 10 ? "0" + temp / sper : temp / sper + "";
} else {
s = temp / sper + "";
}
s += sUnit;
}
return h + m + s;
}
// 把一个毫秒数转化成时间字符串。格式为小时/分/秒/毫秒（如：24903600 –> 06小时55分钟）
/**
*
* @param millis
* 要转化的毫秒数。
* @param isWhole
* 是否强制全部显示小时/分。
* @param isFormat
* 时间数字是否要格式化，如果true：少位数前面补全；如果false：少位数前面不补全。
* @return 返回时间字符串：小时/分/秒/毫秒的格式（如：24903600 --> 06小时55分钟）。
*/
public static String millisToStringShort(long millis, boolean isWhole, boolean isFormat) {
String h = "";
String m = "";
if (isWhole) {
h = isFormat ? "00小时" : "0小时";
m = isFormat ? "00分钟" : "0分钟";
}
long temp = millis;
long hper = 60 * 60 * 1000;
long mper = 60 * 1000;
long sper = 1000;
if (temp / hper > 0) {
if (isFormat) {
h = temp / hper < 10 ? "0" + temp / hper : temp / hper + "";
} else {
h = temp / hper + "";
}
h += "小时";
}
temp = temp % hper;
if (temp / mper > 0) {
if (isFormat) {
m = temp / mper < 10 ? "0" + temp / mper : temp / mper + "";
} else {
m = temp / mper + "";
}
m += "分钟";
}
return h + m;
}
// 把日期毫秒转化为字符串
/**
* @param millis
* 要转化的日期毫秒数。
* @param pattern
* 要转化为的字符串格式（如：yyyy-MM-dd HH:mm:ss）。
* @return 返回日期字符串。
*/
public static String millisToStringDate(long millis, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern, Locale.getDefault());
return format.format(new Date(millis));
}
// 把日期毫秒转化为字符串（文件名）
/**
* @param millis
* 要转化的日期毫秒数。
* @param pattern
* 要转化为的字符串格式（如：yyyy-MM-dd HH:mm:ss）。
* @return 返回日期字符串（yyyy_MM_dd_HH_mm_ss）。
*/
public static String millisToStringFilename(long millis, String pattern) {
String dateStr = millisToStringDate(millis, pattern);
return dateStr.replaceAll("[- :]", "_");
}
// 转换当前时间为易用时间格式
// 1小时内用，多少分钟前； 超过1小时，显示时间而无日期； 如果是昨天，则显示昨天 超过昨天再显示日期； 超过1年再显示年。
public static long oneHourMillis = 60 * 60 * 1000; // 一小时的毫秒数
public static long oneDayMillis = 24 * oneHourMillis; // 一天的毫秒数
public static long oneYearMillis = 365 * oneDayMillis; // 一年的毫秒数
public static String millisToLifeString(long millis) {
long now = System.currentTimeMillis();
long todayStart = string2Millis(millisToStringDate(now, "yyyy-MM-dd"), "yyyy-MM-dd");
// 一小时内
if (now - millis <= oneHourMillis && now - millis > 0l) {
String m = millisToStringShort(now - millis, false, false);
return "".equals(m) ? "1分钟内" : m + "前";
}
// 大于今天开始开始值，小于今天开始值加一天（即今天结束值）
if (millis >= todayStart && millis <= oneDayMillis + todayStart) {
return "今天 " + millisToStringDate(millis, "HH:mm");
}
// 大于（今天开始值减一天，即昨天开始值）
if (millis > todayStart - oneDayMillis) {
return "昨天 " + millisToStringDate(millis, "HH:mm");
}
long thisYearStart = string2Millis(millisToStringDate(now, "yyyy"), "yyyy");
// 大于今天小于今年
if (millis > thisYearStart) {
return millisToStringDate(millis, "MM月dd日 HH:mm");
}
return millisToStringDate(millis, "yyyy年MM月dd日 HH:mm");
}
// 字符串解析成毫秒数
public static long string2Millis(String str, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern, Locale.getDefault());
long millis = 0;
try {
millis = format.parse(str).getTime();
} catch (ParseException e) {
Log.e("TAG", e.getMessage());
}
return millis;
}
收集设备信息，用于信息统计分析
public static Properties collectDeviceInfo(Context context) {
Properties mDeviceCrashInfo = new Properties();
try {
PackageManager pm = context.getPackageManager();
PackageInfo pi = pm.getPackageInfo(context.getPackageName(), PackageManager.GET_ACTIVITIES);
if (pi != null) {
mDeviceCrashInfo.put(VERSION_NAME, pi.versionName == null ? "not set" : pi.versionName);
mDeviceCrashInfo.put(VERSION_CODE, pi.versionCode);
}
} catch (PackageManager.NameNotFoundException e) {
Log.e(TAG, "Error while collect package info", e);
}
Field[] fields = Build.class.getDeclaredFields();
for (Field field : fields) {
try {
field.setAccessible(true);
mDeviceCrashInfo.put(field.getName(), field.get(null));
} catch (Exception e) {
Log.e(TAG, "Error while collect crash info", e);
}
}
return mDeviceCrashInfo;
}
public static String collectDeviceInfoStr(Context context) {
Properties prop = collectDeviceInfo(context);
Set deviceInfos = prop.keySet();
StringBuilder deviceInfoStr = new StringBuilder("{\n");
for (Iterator iter = deviceInfos.iterator(); iter.hasNext();) {
Object item = iter.next();
deviceInfoStr.append("\t\t\t" + item + ":" + prop.get(item) + ", \n");
}
deviceInfoStr.append("}");
return deviceInfoStr.toString();
}
是否有SD卡
public static boolean haveSDCard() {
return android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
}
动态隐藏软键盘
@ TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void hideSoftInput(Activity activity) {
View view = activity.getWindow().peekDecorView();
if (view != null) {
InputMethodManager inputmanger = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
@ TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void hideSoftInput(Context context, EditText edit) {
edit.clearFocus();
InputMethodManager inputmanger = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
inputmanger.hideSoftInputFromWindow(edit.getWindowToken(), 0);
}
动态显示软键盘
@ TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void showSoftInput(Context context, EditText edit) {
edit.setFocusable(true);
edit.setFocusableInTouchMode(true);
edit.requestFocus();
InputMethodManager inputManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.showSoftInput(edit, 0);
}
动态显示或者是隐藏软键盘
@ TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void toggleSoftInput(Context context, EditText edit) {
edit.setFocusable(true);
edit.setFocusableInTouchMode(true);
edit.requestFocus();
InputMethodManager inputManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}
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);
}
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;
}
获取状态栏高度＋标题栏(ActionBar)高度
// (注意，如果没有ActionBar，那么获取的高度将和上面的是一样的，只有状态栏的高度)
public static int getTopBarHeight(Activity activity) {
return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
}
获取MCC+MNC代码 (SIM卡运营商国家代码和运营商网络代码)
// 仅当用户已在网络注册时有效, CDMA 可能会无效（中国移动：46000 46002, 中国联通：46001,中国电信：46003）
public static String getNetworkOperator(Context context) {
TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
return telephonyManager.getNetworkOperator();
}
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();
}
返回移动终端类型
// PHONE_TYPE_NONE :0 手机制式未知
// PHONE_TYPE_GSM :1 手机制式为GSM，移动和联通
// PHONE_TYPE_CDMA :2 手机制式为CDMA，电信
// PHONE_TYPE_SIP:3
public static int getPhoneType(Context context) {
TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
return telephonyManager.getPhoneType();
}
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;
}
}
判断当前手机的网络类型(WIFI还是2,3,4G)
// 需要用到上面的方法
public static int getNetWorkStatus(Context context) {
int netWorkType = Constants.NETWORK_CLASS_UNKNOWN;
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
int type = networkInfo.getType();
if (type == ConnectivityManager.TYPE_WIFI) {
netWorkType = Constants.NETWORK_WIFI;
} else if (type == ConnectivityManager.TYPE_MOBILE) {
netWorkType = getNetWorkClass(context);
}
}
return netWorkType;
}
拨打电话
public static void call(Context context, String phoneNumber) {
context.startActivity(new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phoneNumber)));
}
跳转至拨号界面
public static void callDial(Context context, String phoneNumber) {
context.startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + phoneNumber)));
}
发送短信
public static void sendSms(Context context, String phoneNumber, String content) {
Uri uri = Uri.parse("smsto:" + (TextUtils.isEmpty(phoneNumber) ? "" : phoneNumber));
Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
intent.putExtra("sms_body", TextUtils.isEmpty(content) ? "" : content);
context.startActivity(intent);
}
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" />
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" />
判断当前手机是否处于锁屏(睡眠)状态
public static boolean isSleeping(Context context) {
KeyguardManager kgMgr = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
boolean isSleeping = kgMgr.inKeyguardRestrictedInputMode();
return isSleeping;
}
判断当前是否有网络连接
public static boolean isOnline(Context context) {
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Activity.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
if (info != null && info.isConnected()) {
return true;
}
return false;
}
判断当前是否是WIFI连接状态
public static boolean isWifiConnected(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo wifiNetworkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (wifiNetworkInfo.isConnected()) {
return true;
}
return false;
}
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);
}
判断当前设备是否为手机
public static boolean isPhone(Context context) {
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
if (telephony.getPhoneType() == TelephonyManager.PHONE_TYPE_NONE) {
return false;
} else {
return true;
}
}
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();
}
获取当前设备的IMEI，需要与上面的isPhone()一起使用
@ TargetApi(Build.VERSION_CODES.CUPCAKE)
public static String getDeviceIMEI(Context context) {
String deviceId;
if (isPhone(context)) {
TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
deviceId = telephony.getDeviceId();
} else {
deviceId = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.ANDROID_ID);
}
return deviceId;
}
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;
}
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;
}
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