第一节 登录界面_移动开发_编程开发_程序员俱乐部

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
知识点：
(1)res/目录下:
drawable>>shape
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

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 1 package com.example.demo;
 2 
 3 import android.os.Bundle;
 4 import android.app.Activity;
 5 import android.view.View;
 6 import android.view.View.OnClickListener;
 7 import android.widget.Button;
 8 import android.widget.EditText;
 9 import android.widget.Toast;
10 
11 public class LoginActivity extends Activity implements OnClickListener{
12     
13     private String myAccount = "abc";
14     private String myPwd = "def";
15     EditText account;
16     EditText password;
17     Button btnLogin;
18 
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_login);
23         
24         account = (EditText) findViewById(R.id.edt_account);
25         password = (EditText) findViewById(R.id.edt_pwd);
26         btnLogin = (Button) findViewById(R.id.btn_login);
27         btnLogin.setOnClickListener(this);
28         
29     }
30 
31     @Override
32     public void onClick(View v) {
33         int id = v.getId();
34         String inputAccount = account.getText().toString();
35         String inputPwd = password.getText().toString();
36         if(inputAccount.equals(myAccount)&&inputPwd.equals(myPwd)){
37             Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();
38         }
39         else{
40             Toast.makeText(this, "账号或密码错误", Toast.LENGTH_SHORT).show();
41         }        
42     }
43 }

View Code

activity_login.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     android:gravity="center_horizontal"
 7     android:paddingBottom="@dimen/activity_vertical_margin"
 8     android:paddingLeft="@dimen/activity_horizontal_margin"
 9     android:paddingRight="@dimen/activity_horizontal_margin"
10     android:paddingTop="@dimen/activity_vertical_margin"
11     tools:context=".LoginActivity" >
12 
13     <TextView
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:text="@string/login_title"
17         android:textSize="20sp"
18         android:layout_margin="10dp" />
19     <!-- 账号 -->
20     <LinearLayout 
21         android:layout_width="wrap_content"
22         android:layout_height="wrap_content"
23         android:orientation="horizontal"
24         android:layout_margin="12dp"  >
25         <TextView 
26             android:layout_width="wrap_content"
27             android:layout_height="wrap_content"
28             android:text="@string/account" />
29         <EditText 
30             android:id="@+id/edt_account"
31             android:layout_width="200dp"
32             android:layout_height="wrap_content"
33             android:hint="@string/hint_account"/>
34     </LinearLayout>
35     <!-- 密码 -->
36     <LinearLayout 
37         android:layout_width="wrap_content"
38         android:layout_height="wrap_content"
39         android:orientation="horizontal"
40         android:layout_margin="12dp"  >
41         <TextView 
42             android:layout_width="wrap_content"
43             android:layout_height="wrap_content"
44             android:text="@string/password" />
45         <EditText 
46             android:id="@+id/edt_pwd"
47             android:layout_width="200dp"
48             android:layout_height="wrap_content"
49             android:hint="@string/hint_pwd"
50             android:inputType="textPassword"/>
51     </LinearLayout>
52     <!-- 登录按钮 -->
53     <Button 
54         android:id="@+id/btn_login"
55         android:layout_width="wrap_content"
56         android:layout_height="wrap_content"
57         android:layout_margin="12dp"
58         android:text="@string/btn_login"
59         android:background="@drawable/selector_btn_bg"/>
60 
61 </LinearLayout>

View Code

selector_btn_bg.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <selector xmlns:android="http://schemas.android.com/apk/res/android" >     
 3     <item >
 4         <shape >
 5             <corners android:radius="5dp" />
 6             <gradient android:startColor="@color/light_blue" 
 7                 android:endColor="@color/deep_blue"
 8                 android:angle="-90"/>
 9         </shape>        
10      </item>    
11 </selector>

View Code