在main.xml文件中代码如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请输入EMAIL"/>
<EditText
android:id="@+id/input"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:selectAllOnFocus="true"/>
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/wrong"/>
</LinearLayout>
在MyKeyDemo.java中代码如下：
package com.tarena.key;
import android.R.string;
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 MyKeyDemo extends Activity {
private EditText input = null;
private ImageView img = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.input = (EditText) super.findViewById(R.id.input); //取得组件
this.img = (ImageView) super.findViewById(R.id.img); //取得组件
this.input.setOnKeyListener(new OnKeyListenerImpl());
}
private class OnKeyListenerImpl implements OnKeyListener{
public boolean onKey(View v, int keyCode, KeyEvent event) {
switch (event.getAction()) {
case KeyEvent.ACTION_UP:
String msg = MyKeyDemo.this.input.getText().toString(); // 取得输入的文字信息
if(msg.matches("\\w+@\\w+\\.\\w+")){ //验证通过
MyKeyDemo.this.img.setImageResource(R.drawable.right); //设置正确的图片
}
else{
MyKeyDemo.this.img.setImageResource(R.drawable.wrong); //设置错误的图片
}
case KeyEvent.ACTION_DOWN: //键盘按下
break;
}
return false;
}
}
}