Android-登录测试

 第一步：做一个简单的UI登录界面

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout android:layout_height="match_parent"
 3     android:layout_width="match_parent"
 4     android:paddingTop="70dp"
 5     xmlns:android="http://schemas.android.com/apk/res/android">
 6 
 7    <ImageView
 8        android:id="@+id/im_one"
 9        android:layout_centerHorizontal="true"
10        android:src="@drawable/ic_launcher_background"
11        android:layout_width="wrap_content"
12        android:layout_height="wrap_content"/>
13 
14    <EditText
15        android:id="@+id/username"
16        android:hint="用户名"
17        android:layout_below="@+id/im_one"
18        android:layout_centerHorizontal="true"
19        android:paddingTop="20dp"
20        android:layout_height="wrap_content"
21        android:layout_width="200dp"/>
22 
23    <EditText
24        android:id="@+id/password"
25        android:layout_width="200dp"
26        android:layout_height="wrap_content"
27        android:layout_alignStart="@+id/username"
28        android:layout_below="@+id/username"
29        android:hint="密码"
30        android:inputType="textPassword" />
31 
32    <Button
33        android:id="@+id/login"
34        android:layout_width="wrap_content"
35        android:layout_height="wrap_content"
36        android:layout_below="@+id/password"
37        android:layout_centerHorizontal="true"
38        android:text="登录" />
39 
40 </RelativeLayout>

activity_main.xml

第二步:在Java代码中获取输入的用户名和密码，通过登录按钮的点击事件，去把输入的用户名和密码进行比对，然后通过意图和广播进行反馈登录结果。

MainActivity.java

 1 package com.example.mylogin;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.app.PendingIntent;
 6 import android.content.Intent;
 7 import android.os.Bundle;
 8 import android.util.Log;
 9 import android.view.View;
10 import android.widget.Button;
11 import android.widget.EditText;
12 
13 public class MainActivity extends AppCompatActivity {
14 
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19 
20         EditText et_username = findViewById(R.id.username);
21         EditText et_password = findViewById(R.id.password);
22 
23         Button login = findViewById(R.id.login);
24 
25         login.setOnClickListener(new View.OnClickListener() {
26             @Override
27             public void onClick(View v) {
28 
29                 String username =et_username.getText().toString();
30                 String password =et_password.getText().toString();
31                 Log.e("TAG", "username " + username);
32                 Log.e("TAG", "password " + password);
33                 Intent intent = new Intent();
34                 if (username.equals("123") && password.equals("abc")){
35                     intent.setAction("com.example.CUSTOM_INTENT");
36                     sendBroadcast(intent);
37                 } else{
38                     intent.setAction("com.example.error");
39                     sendBroadcast(intent);                }
40 
41             }
42         });
43     }
44 }

MainActivity

 AndroidManifest.xml

1  <receiver android:name="TestActivity"
2             android:exported="true">
3             <intent-filter>
4                 <action android:name="com.example.CUSTOM_INTENT" />
5                 <action android:name="com.example.error" />
6             </intent-filter>
7 
8         </receiver>

AndroidManifest.xml

 TestActivity.java

 1 package com.example.mylogin;
 2 
 3 import android.content.BroadcastReceiver;
 4 import android.content.Context;
 5 import android.content.Intent;
 6 import android.widget.Toast;
 7 
 8 
 9 public class TestActivity extends BroadcastReceiver {
10     private final String ACTION_BOOT = "com.example.CUSTOM_INTENT";
11     @Override
12     public void onReceive(Context context, Intent intent) {
13         if (ACTION_BOOT.equals(intent.getAction())){
14             Toast.makeText(context, "登陆成功", Toast.LENGTH_SHORT).show();
15         } else {
16             Toast.makeText(context, "登录失败", Toast.LENGTH_SHORT).show();
17         }
18     }
19 }

TestActivity

 最后一步：进行登录测试