Android开发之键盘事件，验证邮箱…

.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal"

    tools:context=".MainActivity" >

    <TextView 

        android:id="@+id/info"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Email"/>

    <EditText 

        android:id="@+id/email"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:selectAllOnFocus="true"/>

    <ImageView 

        android:id="@+id/tip"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/wrong"/>

</LinearLayout>

.java

package com.example.keylistenerdemo;

import android.app.Activity;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.View;

import android.view.View.OnKeyListener;

import android.widget.EditText;

import android.widget.ImageView;

public class MainActivity extends Activity {

private EditText email=null;

private ImageView tip=null;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

this.email=(EditText) super.findViewById(R.id.email);

this.tip=(ImageView) super.findViewById(R.id.tip);

//添加键盘的事件

this.email.setOnKeyListener(new OnKeyListenerImp());

}

private class OnKeyListenerImp implements OnKeyListener{

public boolean onKey(View dialog, int keyCode, KeyEvent event) {

// TODO Auto-generated method stub

switch(event.getAction()){

case KeyEvent.ACTION_UP:

String msg=MainActivity.this.email.getText().toString();

if(msg.matches("\\w+@\\w+\\.\\w+")){

//验证通过

MainActivity.this.tip.setImageResource(R.drawable.right);

}

else{

MainActivity.this.tip.setImageResource(R.drawable.wrong);

}

case KeyEvent.ACTION_DOWN:

break;

}

return false;

}

}

}