Android学习之键盘事件

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;@Overridepublic 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：" /><EditTextandroid:id="@+id/input"android:layout_width="wrap_content"android:layout_height="wrap_content"android:selectAllOnFocus="true" /><ImageViewandroid:id="@+id/img"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/wrong"/></LinearLayout>

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