《通信業(yè)務(wù)開發(fā)》課程焦點(diǎn)事件焦點(diǎn)Focus事件PART18-6事件特性監(jiān)聽接口實(shí)例演示事件特性示例組件獲得或失去焦點(diǎn)事件,如編輯框EditText接口：View.OnFocusChangeListener.OnFocusChange()實(shí)現(xiàn)步驟：獲取監(jiān)聽對(duì)象：如EditText創(chuàng)建監(jiān)聽器類,實(shí)現(xiàn)View.OnFocusChangeListener注冊(cè)監(jiān)聽器：setOnFocusChangeListener()規(guī)則監(jiān)聽接口publicstaticinterfaceView.OnFocusChangeListener(){publicvoidonFocusChange(RadioGroupgroup,intcheckedId){}}voidsetOnFocusChangeListener(OnFocusChangeListener

l)實(shí)例演示<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="手機(jī)號(hào)碼"

/>

<EditText

android:id="@+id/address"

android:layout_width="190dp"

android:layout_height="wrap_content"

android:text="地址"

/>

</LinearLayout>

XML布局實(shí)例演示public

class

MainActivity

extends

Activity

{

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

etMobile=(EditText)findViewById(R.id.mobile);

etAddress=(EditText)findViewById(R.id.address);

etAddress.setOnClickListener(new

AddressOnClickListener());

etAddress.setOnFocusChangeListener(new

AddressOnFocusChanageListener());

}

private

class

AddressOnClickListener

implements

OnClickListener{

@Override

public

void

onClick(View

view){

etAddress.setText("");

}

}

private

class

AddressOnFocusChanageListener

implements

OnFocusChangeListener{

@Override

public

void

onFocusChange(View

view,boolean

hasFocus){

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

Toast.m