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Android OnFocuChangeListener焦點事件詳解

更新時間：2017年09月21日 08:41:50 作者：whaletosea

這篇文章主要為大家詳細(xì)介紹了Android OnFocuChangeListener焦點事件，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了Android OnFocuChangeListener焦點事件的具體代碼，供大家參考，具體內(nèi)容如下

界面

打開“res/layout/activity_main.xml”文件。

<LinearLayout
  xmlns:android="http://schemas.android.com/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)號碼" />

  <EditText
    android:id="@+id/address"
    android:layout_width="190dp"
    android:layout_height="wrap_content"
    android:text="地址" />

</LinearLayout>

MainActivity.java

package 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 {
  //聲明 EditText
  private EditText etMobile=null;
  private EditText etAddress=null;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //獲取EditText
    etMobile = (EditText) super.findViewById(R.id.mobile);
    etAddress = (EditText) super.findViewById(R.id.address);
    //注冊O(shè)nClick OnFocusChange監(jiān)聽器
    etMobile.setOnClickListener(new MobileOnClickListener());
    etMobile.setOnFocusChangeListener(new MobileOnFocusChanageListener());
    etAddress.setOnClickListener(new AddressOnClickListener());
    etAddress.setOnFocusChangeListener(new AddressOnFocusChanageListener());
  }
  //MobileOnClickListener單擊監(jiān)聽器
   private class MobileOnClickListener implements OnClickListener{
    @Override
    public void onClick(View view ){
      etMobile.setText("");
    }
  }
  //MobileOnFocusChanageListener焦點監(jiān)聽器
  private class MobileOnFocusChanageListener implements OnFocusChangeListener{
    @Override
    public void onFocusChange(View view ,boolean hasFocus){
      if(view.getId()==etMobile.getId())
        Toast.makeText(getApplicationContext(),"手機(jī)文本框獲得焦點！",Toast.LENGTH_LONG).show();

    }
  }
  //AddressOnClickListener單擊監(jiān)聽器
  private class AddressOnClickListener implements OnClickListener{
    @Override
    public void onClick(View view){
      etAddress.setText("");
    }
  }
  //MobileOnFocusChanageListener焦點監(jiān)聽器
  private class AddressOnFocusChanageListener implements OnFocusChangeListener{
    @Override
    public void onFocusChange(View view,boolean hasFocus){
      if(view.getId()==etAddress.getId())
        Toast.makeText(getApplicationContext(), "地址文本框獲得焦點！",Toast.LENGTH_LONG).show();
    }
}

效果圖：