4.3给圣诞老人的信息—Toast对象的使用

4.3给圣诞老人的信息—Toast对象的使用... 1

目标... 1

方法... 1

代码... 1

效果... 2

更多详细用法... 2

目标:使用Toast弹出消息.

方法:构造一个Toast对象,调用对象的show()方法

代码:

package edu.cquptzx.UseToast;

import android.app.Activity;

import android.os.Bundle;

import android.text.Editable;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

publicclass UseToastActivity extends Activity {

private Button btn;

private EditText et;

/** Called when the activity is first created. */

publicvoid onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// Find the objects by IDs

btn = (Button) findViewById(R.id.button);

et = (EditText) findViewById(R.id.editText);

// add an listener to tha SEND BUTTON.

btn.setOnClickListener(new OnClickListener()

{

publicvoid onClick(View v)

{

//Get the text which the user have input .

/* 方案二:使用Editable

* 特点,文字获取后可以很方便的进行截取,插入,等操作. */

//Editable str;

//str = et.getText();

/* 方案一:使用String

* 特点,文字固定,编辑不方便. */

String str = null;

str = et.getText().toString();

Toast.makeText(getBaseContext(),

"Your wish: \n \" " + str.toString() + " \" \n has been send to Santa Claus.",

Toast.LENGTH_LONG)

.show();

}

});

}

效果:

For more questions , contacts me by :

cquptzx@qq.com or cquptzx@outlook.com