MyKeyDemo.java:
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); // 设置正确图片
} else {
MyKeyDemo.this.img.setImageResource(R.drawable.wrong); // 设置错误图片
}
case KeyEvent.ACTION_DOWN: // 键盘按下
break;
}
return false;
}
}
}
main.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="请输入EMAIL地址:" /> <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>