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Android EditText 获得输入焦点 以及requestfocus()失效的问题
 最近做公司项目的时候,经常会遇到一个问题,就是我为某个控件如EditText设置requestfocus()的时候不管用,比如说登陆的时候,我判断下用户输入的密码,如果正确就登陆,错误就提示密码错误,并且输入框获取焦点,但是实际中确不起作用packagecom.example.hfs.requestfocu...
代码星球 ·2021-02-15

e620. Activating a Keystroke When Any Component in the Window Has Focus
Normally,akeystrokeregisteredtoacomponentisactivatedwhenthecomponenthasthefocus.ThistypeofactivationconditioniscalledWHEN_FOCUSED.Itispossibletospecifythatakeys...
代码星球 ·2021-02-12

e618. Validating a JTextField When Permanently Losing the Focus
Thisexampledemonstratesatextfieldthatvalidatesitscontentswhenitreceivesapermanentfocus-lostevent.Ifthecontentsareinvalid,itdisplaysamodaldialogwithanerrormessag...
代码星球 ·2021-02-12

e616. Determining If a Focus Lost Is Temporary or Permanent
Atemporaryfocus-losteventoccursifthefocusmovestoanotherwindow.It'stemporarybecausethecomponentwillgainthefocuswhenitswindowbecomesactiveagain.Apermanentfocus-lo...
代码星球 ·2021-02-12

e617. Determining the Opposite Component of a Focus Event
Theoppositecomponentistheothercomponentaffectedinafocusevent.Specifically,inafocus-lostevent,theoppositecomponentistheonegainingthefocus.Inafocus-gainevent,theo...
代码星球 ·2021-02-12

e613. Modifying the Focus Traversal Order
JFrameframe=newJFrame();JButtoncomponent1=newJButton("1");JButtoncomponent2=newJButton("2");JButtoncomponent3=newJButton("3");//Bydefault,thefocustraversalorder...
代码星球 ·2021-02-12

e614. Setting the Initial Focused Component in a Window
Thereisnostraightforwardwaytosettheinitialfocusedcomponentinawindow.Thetypicalmethodistoaddawindowlistenertolistenforthewindowopenedeventandthenmakethedesiredco...
代码星球 ·2021-02-12

e610. Setting Focus Traversal Keys in a Component
Whenthefocusisonacomponent,anyfocustraversalkeyssetforthatcomponentoverridethedefaultfocustraversalkeys.Foranexampleofhowtochangethefocustraversalkeysfortheenti...
代码星球 ·2021-02-12

e611. Setting Focus Traversal Keys for the Entire Application
Thisexamplechangesthefocustraversalkeysfortheentireapplication.Foranexampleofhowtochangethefocustraversalkeysforaparticularcomponent,seee610SettingFocusTraversa...
代码星球 ·2021-02-12

e612. Moving the Focus to the Next or Previous Focusable Component
ThemethodstomovethefocustothenextortothepreviousfocusablecomponentareComponent.transferFocus()andComponent.transferFocusBackward().Thisexamplemodifiesacomponent...
代码星球 ·2021-02-12

e609. Listening to All Focus Changes Between Components in an Application
Tolistentofocuschangeeventsbetweencomponents,installalistenerwiththekeyboardfocusmanager.Ifyouneedtheabilitytoveto(reject)afocuschange,installavetoablelistenerw...
代码星球 ·2021-02-12

e615. Finding the Next Focusable Component
publicComponentfindNextFocus(){//FindfocusownerComponentc=KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();Containerroot=c==null?null:c.get...
代码星球 ·2021-02-12

e606. Determining Which Component or Window Has the Focus
//nullisreturnedifnoneofthecomponentsinthisapplicationhasthefocusComponentcompFocusOwner=KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();/...
代码星球 ·2021-02-12

e621. Activating a Keystroke When Any Child Component Has Focus
Normally,akeystrokeregisteredonacomponentisactivatedwhenthecomponenthasthefocus.ThistypeofactivationconditioniscalledWHEN_FOCUSED.Itispossibletospecifythatakeys...
代码星球 ·2021-02-12

e636. Listening to All Key Events Before Delivery to Focused Component
Registeringakeyeventdispatcherwiththekeyboardfocusmanagerallowsyoutoseeallkeyeventsbeforetheyaresenttothefocusedcomponent.Itispossibletomodifytheeventorevenprev...
代码星球 ·2021-02-12
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