AndroidStudio登录界面

1 public void thisButtonLogin(View view){
2     
3 }

1         EditText editText = (EditText)findViewById(R.id.userEdit);
2         String user = editText.getText().toString();
3         editText = (EditText)findViewById(R.id.passwordEdit);
4         String pw = editText.getText().toString();

 1         if (user == null || user.length() == 0) {
 2             AlertDialog.Builder usermessage=new AlertDialog.Builder(this);
 3             usermessage.setMessage("用户名不能为空！");
 4             usermessage.setPositiveButton("确定",click1);
 5             AlertDialog usermessage1=usermessage.create();
 6             usermessage1.show();
 7         }else if(pw == null || pw.length() == 0) {
 8             AlertDialog.Builder pwmessage=new AlertDialog.Builder(this);
 9             pwmessage.setMessage("密码不能为空！");
10             pwmessage.setPositiveButton("确定",click1);
11             AlertDialog pwmessage1=pwmessage.create();
12             pwmessage1.show();
13         }

1             //弹出信息框，显示用户输入的账号和密码
2             AlertDialog.Builder winmessage = new AlertDialog.Builder(this);
3             winmessage.setMessage("账号:"+user+"\n"+"密码:"+pw);
4             winmessage.setPositiveButton("确定",click2);
5             AlertDialog winmessage2 = winmessage.create();
6             winmessage2.show();

1     private DialogInterface.OnClickListener click1 = new DialogInterface.OnClickListener() {
2         @Override
3         public void onClick(DialogInterface dialog, int which) {
4             dialog.cancel();
5         }
6     };

1     private DialogInterface.OnClickListener click2 = new DialogInterface.OnClickListener() {
2         @Override
3         public void onClick(DialogInterface dialog, int which) {
4             android.os.Process.killProcess(android.os.Process.myPid());
5         }
6     };

 1 package com.shawna.login;
 2 
 3 import android.content.DialogInterface;
 4 import android.support.v7.app.AlertDialog;
 5 import android.support.v7.app.AppCompatActivity;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.EditText;
 9 
10 public class Login extends AppCompatActivity {
11 
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_login);
16     }
17     public void thisButtonLogin(View view){
18         //接收按钮按下事件
19 
20         //获取用户输入的账号和密码
21         EditText editText = (EditText)findViewById(R.id.userEdit);
22         String user = editText.getText().toString();
23         editText = (EditText)findViewById(R.id.passwordEdit);
24         String pw = editText.getText().toString();
25 
26         //这一段是测试的遗留的，用来在判断前输出输入的账号内容
27         //AlertDialog.Builder message = new AlertDialog.Builder(this);
28         //message.setMessage(user);
29         //message.setPositiveButton("确定",click1);
30         //AlertDialog message1 = message.create();
31         //message1.show();
32 
33         //判断两个编辑框内容是否为空
34         if (user == null || user.length() == 0) {
35             AlertDialog.Builder usermessage=new AlertDialog.Builder(this);
36             usermessage.setMessage("用户名不能为空！");
37             usermessage.setPositiveButton("确定",click1);
38             AlertDialog usermessage1=usermessage.create();
39             usermessage1.show();
40         }else if(pw == null || pw.length() == 0) {
41             AlertDialog.Builder pwmessage=new AlertDialog.Builder(this);
42             pwmessage.setMessage("密码不能为空！");
43             pwmessage.setPositiveButton("确定",click1);
44             AlertDialog pwmessage1=pwmessage.create();
45             pwmessage1.show();
46         }else{
47             //弹出信息框，显示用户输入的账号和密码
48             AlertDialog.Builder winmessage = new AlertDialog.Builder(this);
49             winmessage.setMessage("账号:"+user+"\n"+"密码:"+pw);
50             winmessage.setPositiveButton("确定",click2);
51             AlertDialog winmessage2 = winmessage.create();
52             winmessage2.show();
53         }
54     }
55     private DialogInterface.OnClickListener click1 = new DialogInterface.OnClickListener() {
56         @Override
57         public void onClick(DialogInterface dialog, int which) {
58             dialog.cancel();
59         }
60     };
61     private DialogInterface.OnClickListener click2 = new DialogInterface.OnClickListener() {
62         @Override
63         public void onClick(DialogInterface dialog, int which) {
64             android.os.Process.killProcess(android.os.Process.myPid());
65         }
66     };
67 }