Toast 弹出组件

一 ，在string.xml 中添加字符串

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">EX_Ctrl_3</string>
<string name="dear">亲爱的圣诞老人：</string>
<string name="sendmyWish">送出愿望</string>
<string name="yourWish">你的愿望：</string>
<string name="hasSend">已送达圣诞老人信箱!</string>
</resources>

二，在main.xml 布局中添加UI 元素：一个TextView、一个EditView 和一个Button

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@+id/TextView_dear"
android:text="@string/dear"></TextView>
<EditText
android:layout_height="wrap_content"
android:id="@+id/EditText_Wish"
android:layout_width="fill_parent"></EditText>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/Button_Send"
android:text="@string/sendmyWish"
android:layout_marginLeft="50px"></Button>
</LinearLayout>

三，mainActivity.java 文件

package zyf.EX_Ctrl_3;
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class EX_Ctrl_3 extends Activity {
/** Called when the activity is first created. */
/*声明两个对象变量(按钮与编辑文字)*/
private Button mButton;
private EditText mEditText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/*通过findViewById()取得对象*/
mButton=(Button)findViewById(R.id.Button_Send);
mEditText=(EditText)findViewById(R.id.EditText_Wish);
/*设置onClickListener 给Button 对象聆听onClick 事件*/
mButton.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
/*声明字符串变量并取得用户输入的EditText 字符串*/
Editable Str;
Str=mEditText.getText();
/*使用CharSequence类getString()方法从XML中获取String*/
CharSequence string2=getString(R.string.yourWish);
CharSequence string3=getString(R.string.hasSend);
/*使用系统标准的makeText()方式来产生Toast 信息*/
Toast.makeText( EX_Ctrl_3.this,string2+Str.toString()+string3,Toast.LENGTH
_LONG).show();
/*清空EditText*/
mEditText.setText("");
}
});
}
}