Android EditText失去焦点可以干的事情

package com.teego.activity;         import Android.app.Activity;   import android.os.Bundle;   import android.text.InputType;   import android.view.View;   import android.view.View.OnFocusChangeListener;   import android.widget.EditText;   import android.widget.Toast;      public class HelloEditText extends Activity {       private EditText edit1, edit2, edit3;          @Override       public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.main);           edit1 = (EditText) findViewById(R.id.ed_txt1);           edit2 = (EditText) findViewById(R.id.ed_txt2);           edit3 = (EditText) findViewById(R.id.ed_txt3);                      edit1.setInputType(InputType.TYPE_NULL);           edit2.setInputType(InputType.TYPE_NULL);           edit3.setInputType(InputType.TYPE_NULL);              edit1.setOnFocusChangeListener(new OnFocusChangeListener() {                  @Override               public void onFocusChange(View v, boolean hasFocus) {                   if(edit1.hasFocus()==false){                       Toast.makeText(HelloEditText.this, "可以进行验证1", Toast.LENGTH_SHORT).show();                      }                                  }           });           edit2.setOnFocusChangeListener(new OnFocusChangeListener() {                  @Override               public void onFocusChange(View v, boolean hasFocus) {                                      Toast.makeText(HelloEditText.this, "可以进行验证2", Toast.LENGTH_SHORT).show();                  }           });           edit3.setOnFocusChangeListener((new OnFocusChangeListener() {                  @Override               public void onFocusChange(View v, boolean hasFocus) {      //              Toast.makeText(HelloEditText.this, "可以进行验证3", Toast.LENGTH_SHORT).show();                  }           }));       }          }