4.3给圣诞老人的信息—Toast对象的使用

目录

 

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:

更多详细用法:

 

 

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