Android OnFocuChangeListener焦点事件详解

本文实例为大家分享了Android OnFocuChangeListener焦点事件的具体代码，供大家参考，具体内容如下

界面

打开“res/layout/activity_main.xml”文件。

代码语言：javascript复制

<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="手机号码" / 

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

</LinearLayout 

MainActivity.java

代码语言：javascript复制

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 {
  //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(), "地址文本框获得焦点！",Toast.LENGTH_LONG).show();
    }
}

效果图：

以上就是本文的全部内容，希望对大家的学习有所帮助。

java xml android layout 事件

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