键盘事件OnKeyListener

1.效果图：就是在文本框中输入A，则显示A，输入B，则显示B....

(1)activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.app3.MainActivity"
11     android:orientation="vertical">
12 
13     <EditText
14         android:id="@+id/et"
15         android:layout_width="match_parent"
16         android:layout_height="wrap_content" />
17     <TextView
18         android:id="@+id/tv_show"
19         android:layout_width="wrap_content"
20         android:layout_height="wrap_content"
21         android:text="" />
22 </LinearLayout>

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