android如何创建自己的监听接口

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1、android如何创建自己的监听接口第一步：创建接口和方法publicinterfaceOnUsernameAvailableListener{publicabstractvoidonAvailableChecked(Stringusername,booleanavailable);}第二步：定义变量保存listenerOnUsernameAvailableListeneronUsernameAvailableListener=null;第三步：提供方法允许用户设置Listener//AllowstheusertosetanListenerandre

2、acttotheeventpublicvoidsetOnUsernameAvailableListener(OnUsernameAvailableListenerlistener){onUsernameAvailableListener=listener;}第四步：提供方法允许用户获得ListenerpublicfinalOnUsernameAvailableListenergetOnUsernameAvailableListener(){returnonUsernameAvailableListener;}第五步：添加方法，此方法每次在监听事件被触

3、发的时候调用//ThisfunctioniscalledafterthecheckwascompleteprivatevoidOnUserChecked(Stringusername,booleanavailable){//CheckiftheListenerwasset,otherwisewe'llgetanExceptionwhenwetrytocallitif(onUsernameAvailableListener!=null){//Onlytriggertheevent,whenwehaveausernameif(!TextUtils.isE

4、mpty(username)){onUsernameAvailableListener.onAvailableChecked(username,available);}}}完成。附完整代码：packagecom.tseng.examples;importcom.tseng.examples.CheckUsernameEditText.OnUsernameAvailableListener;importandroid.app.Activity;importandroid.graphics.Color;importandroid.os.Bundle;im

5、portandroid.view.View;importandroid.view.View.OnClickListener;importandroid.widget.Button;importandroid.widget.EditText;importandroid.widget.TextView;publicclassRegisterExampleextendsActivity{//DeclareourViews,sowecanaccessthemlaterprivateCheckUsernameEditTextetUsername;private

6、EditTextetPassword;privateEditTextetPassword2;privateButtonbtnRegister;privateButtonbtnCancel;privateTextViewlblUserStatus;/**Calledwhentheactivityisfirstcreated.*/@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);//SetActivityLayoutsetCon

7、tentView(R.layout.main);//GettheEditTextandButtonReferencesetUsername=(CheckUsernameEditText)findViewById(R.id.username);etPassword=(EditText)findViewById(R.id.password);etPassword2=(EditText)findViewById(R.id.password2);btnRegister=(Button)findViewById(R.id.register_button);bt

8、nCancel=(Button)findViewById(R.id.cancel_button);lblUs