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本文汇集36个android开发常用经典代码片段，包括拨打电话、发送短信、唤醒屏幕并解锁、是否有网络连接、动态显示或者是隐藏软键盘等，希望对您有所帮助。
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//36个android开发常用代码片段
//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;
}
//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;
}
//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);
}
//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 + "" ;
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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