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Android开发常用代码片段提高开发速度

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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(

);

if

(!tasks.isEmpty()) {

ComponentName topActivity = tasks.get(

).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(),

).versionName;

catch

(PackageManager.NameNotFoundException e) {

e.printStackTrace();

return

version;

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(),

);

@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(),

);

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,

);

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,

);

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
 =

/**

*wifi net work

*/

public

static

final

int

NETWORK_WIFI
 =

/**

*"2G" networks

*/

public

static

final

int

NETWORK_CLASS_2_G
 =

/**

*"3G" networks

*/

public

static

final

int

NETWORK_CLASS_3_G
 =

/**

*"4G" networks

*/

public

static

final

int

NETWORK_CLASS_4_G
 =

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;

px-dp转换

public

static

int

dip2px(Context context,

float

dpValue)
 {

final

float

scale = context.getResources().getDisplayMetrics().density;

return

int

) (dpValue *scale +

.5f);

public

static

int

px2dip(Context context,

float

pxValue)
 {

final

float

scale = context.getResources().getDisplayMetrics().density;

return

int

) (pxValue / scale +

.5f);

px-sp转换

public

static

int

px2sp(Context context,

float

pxValue)
 {

final

float

fontScale = context.getResources().getDisplayMetrics().scaledDensity;

return

int

) (pxValue / fontScale
 +

.5f);

public

static

int

sp2px(Context context,

float

spValue)
 {

final

float

fontScale = context.getResources().getDisplayMetrics().scaledDensity;

return

int

) (spValue *fontScale
 +

.5f);

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 =

long

mper =

long

sper =

if

(temp / hper >

) {

if

(isFormat) {

h = temp / hper <

"0"

+
 temp / hper :temp / hper +

""

else

h = temp / hper +

""

h +=

"小时"

temp = temp % hper;

if

(temp / mper >

) {

if

(isFormat) {

m = temp / mper <

"0"

+
 temp / mper :temp / mper +

""

else

m = temp / mper +

""

m +=

"分"

temp = temp % mper;

if

(temp / sper >

) {

if

(isFormat) {

s = temp / sper <

"0"

+
 temp / sper :temp / sper +

""

else

s = temp / sper +

""

s +=

"秒"

temp = temp % sper;

mi =temp +

""

if

(isFormat) {

if

(temp <

&& temp >=

)
 {

mi =

"0"

+temp;

if

(temp <

) {

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 =

long

mper =

long

sper =

if

(temp / hper >

) {

if

(isFormat) {

h = temp / hper <

"0"

+
 temp / hper :temp / hper +

""

else

h = temp / hper +

""

&nb

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