java - 仅显示一次登录 Activity ，并在下次启动主要 Activity 时显示

Question

我想在第一次进入应用程序时打开 login_activity，然后在第二次进入应用程序时打开 main_activity。

我创造了一些东西，但它不起作用。所以我想知道我做错了什么？这是我的登录 Activity

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        userName = (EditText) findViewById(R.id.username);
        userPhone = (EditText) findViewById(R.id.userPhone);
        loginBtn = (Button) findViewById(R.id.buttonLogin);

        dbHandler = new LogsDBHandler(this);

        loginBtn.setOnClickListener(this);
        setTitle("AMS - biomasa | prijava");

       SharedPreferences pref = getSharedPreferences("ActivityPREF", Context.MODE_PRIVATE);
        if (pref.getBoolean("activity_executed", false)) {
            Intent intent = new Intent(this, MainActivity.class);
            startActivity(intent);
            finish();
        } else {
            SharedPreferences.Editor edt = pref.edit();
            edt.putBoolean("activity_executed", true);
            edt.commit();
        }
    }

    public void insert() {
        User user = new User (
                userName.getText().toString(),
                userPhone.getText().toString());
        dbHandler.addUser(user);
        Toast.makeText(getBaseContext(), "Prijavljeni ste!", Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onClick(View v) {
        if (v == loginBtn && validateUser()) {
            insert();
        }
    }

在主要 Activity 中，我只有图像和两个按钮。在 list 中，我将启动器添加到主 Activity 和登录 Activity 。

<activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"></action>
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    <activity android:name=".LoginActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"></action>
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

我在这里做错了什么？

Answer 1

1. 创建一个名为 SplashActivity 的启动 Activity

   public class SplashActivity extends Activity{
   
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_splash);
   
   // decide here whether to navigate to Login or Main Activity 
   
       SharedPreferences pref = getSharedPreferences("ActivityPREF", Context.MODE_PRIVATE);
       if (pref.getBoolean("activity_executed", false)) {
           Intent intent = new Intent(this, MainActivity.class);
           startActivity(intent);
           finish();
       } else {
           Intent intent = new Intent(this, LoginActivity.class);
           startActivity(intent);
           finish();
       }
   }
   
   }
   

2. 在您的 LoginActivity 中，只需将 activity_executed 设置为 true

   public void insert() {
       User user = new User (
           userName.getText().toString(),
           userPhone.getText().toString());
       dbHandler.addUser(user);
       Toast.makeText(getBaseContext(), "Prijavljeni ste!", Toast.LENGTH_SHORT).show();
   
   //set activity_executed inside insert() method.
   SharedPreferences pref = getSharedPreferences("ActivityPREF", Context.MODE_PRIVATE);
   SharedPreferences.Editor edt = pref.edit();
   edt.putBoolean("activity_executed", true);
   edt.commit();
   
   }
   

如下更改 list -

<activity android:name=".MainActivity"/>

<activity android:name=".LoginActivity" />

<activity android:name=".SplashActivity" >

    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>

</activity>