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界面

activity_main.xml
xmlversion=”1.0″encoding=”utf-8″?>
<LinearLayoutxmlns:android=”http://schemas.android.com/apk/res/android”
xmlns:tools=”http://schemas.android.com/tools”
android:id=”@+id/activity_main”
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”
android:orientation=”vertical”
tools:context=”com.example.zzyy.myapplication20161216.MainActivity”
android:weightSum=”1″>

<EditText
android:id=”@+id/myed”
android:layout_width=”188dp”
android:layout_height=”wrap_content”
android:text=”请输入您的姓名”/>
<Button
android:id=”@+id/mybut”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:text=”显现输入信息”/>
<TextView
android:id=”@+id/mytext”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:text=”输入的信息是:”/>
LinearLayout>
MainActivity.java
packagecom.example.zzyy.myapplication20161216;
importandroid.support.v7.app.AppCompatActivity;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.widget.Button;
importandroid.widget.EditText;
importandroid.widget.TextView;
publicclassMainActivityextendsAppCompatActivity{
privateTextViewshowView=null;
privateEditTextedit=null;
privateButtonbut=null;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.but=(Button)super.findViewById(R.id.mybut);
this.showView=(TextView)super.findViewById(R.id.mytext);
this.edit=(EditText)super.findViewById(R.id.myed);
this.edit.setOnClickListener(newOnClickListenerImpl());
this.edit.setOnFocusChangeListener(newOnFocusChangeListenerImpl());
but.setOnClickListener(newShowLIstener());
}
privateclassOnFocusChangeListenerImplimplementsView.OnFocusChangeListener{
@Override
publicvoidonFocusChange(Viewv,booleanhasFocus){
if(v.getId()==MainActivity.this.edit.getId()){
if(hasFocus){
MainActivity.this.showView.setText(“文本输入组件获得焦点。”);
}else{
if(MainActivity.this.edit.getText().length()>0){
}else{
MainActivity.this.showView.setText(“文本输入组件失掉焦点,输入内容不能为空”);
}
}
}
}
}
privateclassOnClickListenerImplimplementsView.OnClickListener{
publicvoidonClick(Viewv){
MainActivity.this.edit.setText(“”);
}
}
privateclassShowLIstenerimplementsView.OnClickListener{
publicvoidonClick(Viewview){
Stringinfo=edit.getText().toString();
showView.setText(“输入的内容是:”+info);
}
}