【移动应用开发技术】Android中怎么实现OnFocuChangeListener焦点事件

【移动应用开发技术】Android中怎么实现OnFocuChangeListener焦点事件

这篇文章将为大家详细讲解有关Android中怎么实现OnFocuChangeListener焦点事件，文章内容质量较高，因此在下分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。打开“res/layout/activity_main.xml”文件。<LinearLayout

xmlns:android="/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

>

<EditText

android:id="@+id/mobile"

android:layout_width="190dp"

android:layout_height="wrap_content"

android:text="手机号码"

/>

<EditText

android:id="@+id/address"

android:layout_width="190dp"

android:layout_height="wrap_content"

android:text="地址"

/>

</LinearLayout>MainActivity.javapackage

com.example.whaletosea.application04;

import

android.os.Bundle;

import

android.app.Activity;

import

android.view.View;

import

android.widget.EditText;

import

android.view.View.OnClickListener;

import

android.view.View.OnFocusChangeListener;

import

android.widget.Toast;

public

class

MainActivity

extends

Activity

{

//声明

EditText

private

EditText

etMobile=null;

private

EditText

etAddress=null;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//获取EditText

etMobile

=

(EditText)

super.findViewById(R.id.mobile);

etAddress

=

(EditText)

super.findViewById(R.id.address);

//注册OnClick

OnFocusChange监听器

etMobile.setOnClickListener(new

MobileOnClickListener());

etMobile.setOnFocusChangeListener(new

MobileOnFocusChanageListener());

etAddress.setOnClickListener(new

AddressOnClickListener());

etAddress.setOnFocusChangeListener(new

AddressOnFocusChanageListener());

}

//MobileOnClickListener单击监听器

private

class

MobileOnClickListener

implements

OnClickListener{

@Override

public

void

onClick(View

view

){

etMobile.setText("");

}

}

//MobileOnFocusChanageListener焦点监听器

private

class

MobileOnFocusChanageListener

implements

OnFocusChangeListener{

@Override

public

void

onFocusChange(View

view

,boolean

hasFocus){

if(view.getId()==etMobile.getId())

Toast.makeText(getApplicationContext(),"手机文本框获得焦点！",Toast.LENGTH_LONG).show();

}

}

//AddressOnClickListener单击监听器

private

class

AddressOnClickListener

implements

OnClickListener{

@Override

public

void

onClick(View

view){

etAddress.setText("");

}

}

//MobileOnFocusChanageListener焦点监听器

private

class

AddressOnFocusChanageListener

implements

OnFocusChangeListener{

@Override

public

void

onFocusChange(View

view,boolean

hasFocus){

if(view.getId()==etAddress.getId())

Toast.makeText(getApplicationContext(),

"地址文本框获得焦