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1.如何看官方文档 2.了解Eclipse下的工程结构 3.写一个登录界面,并实现简单的验证功能 注意: (1)res/目录下: drawable>>shape (关于shape的使用,参考) values>>string values>>colors (2)xml标签: android:gravity=""和android:layout_gravity="" 区别:前者放在上级标签,后者放在本标签 (3)密码: 输入提示android:hint="@string/hint_pwd" 输入类型android:inputType="textPassword" ( 4)Toast类: Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show(); 运行截图:源代码:
LoginActivity.java
package com.example.demo;import android.os.Bundle;import android.app.Activity;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class LoginActivity extends Activity implements OnClickListener{ private String myAccount = "abc"; private String myPwd = "def"; EditText account; EditText password; Button btnLogin; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); account = (EditText) findViewById(R.id.edt_account); password = (EditText) findViewById(R.id.edt_pwd); btnLogin = (Button) findViewById(R.id.btn_login); btnLogin.setOnClickListener(this); } @Override public void onClick(View v) { int id = v.getId(); String inputAccount = account.getText().toString(); String inputPwd = password.getText().toString(); if(inputAccount.equals(myAccount)&&inputPwd.equals(myPwd)){ Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show(); } else{ Toast.makeText(this, "账号或密码错误", Toast.LENGTH_SHORT).show(); } }}