登录界面 beta版

1.MainActivity.java

  1 package com.example.administrator.myapplication;
  2 
  3 import android.content.Intent;
  4 import android.support.v7.app.AppCompatActivity;
  5 import android.os.Bundle;
  6 import android.view.View;
  7 import android.widget.EditText;
  8 import android.widget.Toast;
  9 
 10 public class MainActivity extends AppCompatActivity {
 11     EditText et_usercode;
 12     EditText et_password;
 13     @Override
 14     protected void onCreate(Bundle savedInstanceState) {
 15         super.onCreate(savedInstanceState);
 16         setContentView(R.layout.activity_main);
 17 
 18         et_usercode=(EditText)findViewById(R.id.et_usercode);
 19         et_password=(EditText)findViewById(R.id.et_password);
 20     }
 21     //view 代表事件发起者
 22     public void bt1_onclick(View v)
 23     {
 24         //带返回的打开 注册Acivity
 25 
 26         //第一步:构造意图
 27 
 28         Intent intent = new Intent(this,zhuceActivity.class);
 29 
 30         startActivityForResult(intent,1);
 31     }
 32     //成员变量
 33     String usercode;
 34     String username;
 35     String password;
 36 
 37     //重写处理返回信息的回调方法
 38 
 39     @Override
 40     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 41         super.onActivityResult(requestCode, resultCode, data);
 42 
 43         //处理返回信息
 44         //1-判断请求码
 45         if (requestCode==1)
 46         {
 47             //2-判断结果码
 48             if (resultCode==RESULT_OK)
 49             {
 50                 //接收返回的注册信息
 51                 usercode = data.getStringExtra("usercode");
 52                 username = data.getStringExtra("username");
 53                 password = data.getStringExtra("userpassword");
 54             }
 55 
 56         }
 57 
 58     }
 59 
 60     //登录的方法
 61 
 62     public void bt2_onclick(View v)
 63     {
 64         //1.取得填写信息
 65         String uc = et_usercode.getText().toString();
 66         String pw = et_password.getText().toString();
 67 
 68         // 2.判断是否正确填写
 69         if (uc.trim().length()==0||pw.trim().length()==0)
 70         {
 71             Toast.makeText(MainActivity.this, "用户代码和密码不能为空", Toast.LENGTH_LONG).show();
 72 
 73             return;
 74         }
 75         // 3.判断有没有注册信息
 76         //1-没有找到注册信息 2-填写的用户信息尚未注册
 77         if (usercode ==null||(usercode !=null && !usercode.equals(uc)))
 78         {
 79             Toast.makeText(MainActivity.this, "用户未注册", Toast.LENGTH_LONG).show();
 80 
 81             return;
 82         }
 83         // 4.注册信息与登录信息是否匹配
 84 
 85         if (!password.equals(pw))
 86         {
 87             Toast.makeText(MainActivity.this, "密码错误", Toast.LENGTH_LONG).show();
 88 
 89             return;
 90         }
 91         else
 92         {
 93             //可以登录系统
 94             Toast.makeText(MainActivity.this, "用户验证成功", Toast.LENGTH_LONG).show();
 95 
 96             //跳转到主界面
 97             startActivity(new Intent(this,TestActivity.class));
 98         }
 99     }
100 }

2.Actvitymain.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.administrator.myapplication.MainActivity"
11     android:orientation="vertical">
12 
13     <EditText
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:hint="用户代码"
17         android:id="@+id/et_usercode"/>
18     <EditText
19         android:layout_width="match_parent"
20         android:layout_height="wrap_content"
21         android:hint="密码"
22         android:id="@+id/et_password"
23         android:inputType="textPassword"/>
24     <LinearLayout
25         android:layout_width="match_parent"
26         android:layout_height="wrap_content">
27         <Button
28             android:layout_width="0dp"
29             android:layout_height="wrap_content"
30             android:layout_weight="1"
31             android:text="登录"
32             android:onClick="bt2_onclick"/>
33         <Button
34             android:layout_width="0dp"
35             android:layout_height="wrap_content"
36             android:layout_weight="1"
37             android:text="注册"
38             android:onClick="bt1_onclick"/>
39     </LinearLayout>
40 </LinearLayout>

3.zhuceActivity.xml

 1 package com.example.administrator.myapplication;
 2 
 3 import android.content.Intent;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.EditText;
 8 import android.widget.Toast;
 9 
10 public class zhuceActivity extends AppCompatActivity {
11     EditText et_usercode1;
12     EditText et_password1;
13     EditText et_username1;
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         super.onCreate(savedInstanceState);
17         setContentView(R.layout.activity_zhuce);
18 
19         et_usercode1 = (EditText)findViewById(R.id.et_usercode_1);
20         et_password1 = (EditText)findViewById(R.id.et_password_1);
21         et_username1 = (EditText)findViewById(R.id.et_username_1);
22     }
23     //view 代表事件发起
24     public void bt1_onclick(View v)
25     {
26         //返回注册信息
27         //用户代码
28         String usercode = et_usercode1.getText().toString();
29         if(usercode==null||usercode.trim().length()==0)
30         {
31             Toast.makeText(zhuceActivity.this, "请正确填写用户代码", Toast.LENGTH_LONG).show();
32 
33             return;
34         }
35         String username = et_username1.getText().toString();
36         if(username==null||username.trim().length()==0)
37         {
38             Toast.makeText(zhuceActivity.this, "请正确填写用户名称", Toast.LENGTH_LONG).show();
39 
40             return;
41         }
42         String password = et_password1.getText().toString();
43         if(password==null||password.trim().length()==0)
44         {
45             Toast.makeText(zhuceActivity.this, "请正确填写用户密码", Toast.LENGTH_LONG).show();
46 
47             return;
48         }
49 
50         Intent intent = new Intent();
51 
52         intent.putExtra("usercode",usercode);
53         intent.putExtra("username",username);
54         intent.putExtra("password",password);
55 
56         //设置返回信息:1-结果码;2-携带数据的Intent.
57         setResult(RESULT_OK,intent);
58 
59         finish();
60     }
61 
62     public void bt2_onclick(View v)
63     {
64         setResult(RESULT_CANCELED, null);
65 
66         finish();
67     }
68 }

4.activity_zhuce.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.administrator.myapplication.zhuceActivity">
11     <EditText
12         android:layout_width="match_parent"
13         android:layout_height="wrap_content"
14         android:hint="用户代码"
15         android:id="@+id/et_usercode_1"/>
16     <EditText
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content"
19         android:hint="用户名称"
20         android:id="@+id/et_username_1"
21         android:layout_below="@+id/et_usercode_1"/>
22     <EditText
23         android:layout_width="match_parent"
24         android:layout_height="wrap_content"
25         android:hint="登录密码"
26         android:id="@+id/et_password_1"
27         android:layout_below="@+id/et_username_1"
28         android:inputType="textPassword"/>
29     <LinearLayout
30         android:layout_width="match_parent"
31         android:layout_height="wrap_content"
32         android:layout_alignParentBottom="true">
33         <Button
34             android:layout_width="0dp"
35             android:layout_height="wrap_content"
36             android:layout_weight="1"
37             android:text="取消"
38             android:onClick="bt2_onclick"/>
39         <Button
40             android:layout_width="0dp"
41             android:layout_height="wrap_content"
42             android:layout_weight="1"
43             android:text="确定"
44             android:onClick="bt1_onclick"/>
45     </LinearLayout>
46 </RelativeLayout>

呵呵,导致程序无法运行的错误啊!