//聲明相應的程序包package com.example.sample4_1;//導入程序所依賴的類庫import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.widget.Button;import android.widget.EditText;import android.view.View.OnClickListener;import android.view.*;import android.widget.*;//創(chuàng)建MainActivity繼承于Activity類public class MainActivity extends Activity {? ? //一般應從其它途徑獲取用戶名和密碼，這里定義成常量 String strUserName="TestUser"; String strPWD="123456"; EditText ?txt_UserName; EditText ?txt_PWD; Button btn_Login; Button btn_Cancel; //重寫onCreate()方法 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); txt_UserName=(EditText)this.findViewById(R.id.txt_UserName); txt_PWD=(EditText)this.findViewById(R.id.txt_PWD); btn_Login=(Button)this.findViewById(R.id.btn_Login); btn_Cancel=(Button)this.findViewById(R.id.btn_Cancel); btn_Login.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ String str_UserName=txt_UserName.getText().toString(); String str_PWD=txt_PWD.getText().toString(); if(str_UserName.equals(strUserName) && str_PWD.equals(strPWD)){ Toast toast=Toast.makeText(MainActivity.this, "身份驗證通過！", Toast.LENGTH_SHORT); toast.show(); //可接著轉(zhuǎn)向其它頁面處理，這里等待系統(tǒng)自動結(jié)束程序 Intent intent=new Intent(MainActivity.this,NextDealActivity.class); startActivity(intent); } else{ Toast toast=Toast.makeText(MainActivity.this, "身份錯誤！", Toast.LENGTH_SHORT); toast.show(); txt_UserName.setText(""); txt_PWD.setText(""); } } }); btn_Cancel.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ //強制結(jié)束Activity finish(); } }); }}