Java 一次性欢迎屏幕不工作

因此，我想通过在另一篇文章中找到的答案中使用

SharedReferences

为我的应用程序创建一个一次性的介绍屏幕。起初，代码似乎正常工作，但现在不行。有人能告诉我发生了什么吗

WelcomeActivity.java（启动器活动）：

---

Init:final Boolean WelcomeScreenShowed=prefs.getBoolean（showWelcomeScreenString，true）； 没错。第一次运行后，将其设为False： putBoolean（showWelcomeScreenString，false）

}

它可以工作

public class MainActivity extends AppCompatActivity {

SharedPreferences prefs;
 boolean welcomeScreenShown ;
final String showWelcomeScreenString = "showWelcome";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    Button getStarted = (Button) findViewById(R.id.txt);

    prefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
    welcomeScreenShown = prefs.getBoolean(showWelcomeScreenString, true);

    getStarted.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(MainActivity.this, "welcomeScreenShown:"+welcomeScreenShown, Toast.LENGTH_SHORT).show();
            System.out.println("welcomeScreenShown:"+welcomeScreenShown);
            if (welcomeScreenShown) {
                welcomeScreenShown = false;

                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean(showWelcomeScreenString, false);
                editor.apply();
                //startActivity(new Intent(MainActivity.this, LoginReliefAccountActivity.class));

            } else if(!welcomeScreenShown){
               // System.out.println("welcomeScreenShown:"+welcomeScreenShown);
               // startActivity(new Intent(MainActivity.this, LoginReliefAccountActivity.class));
            }
        }
    });
}

---

}好的。我在代码中犯了一个愚蠢的错误。我将

SharedReferences

代码放在OnClickListener中。如果我将其反转，那么如果sharedprefs布尔值为

true

，则设置OnClickListener。

在清除设置中的数据后是否尝试再次运行应用程序？是的，我已经这样做了。我实际上已将其设置为true，然后在按下按钮后更改为false。它不起作用，所以我试着把它调大，看看它是否能起作用。如果你点击欢迎屏幕上的按钮，它会带你进入登录屏幕。这意味着，如果您重新启动应用程序，它是否直接进入登录？否，如果您直接进入登录活动，请在onCreate中添加以下内容：“WelcomeScreenShowed=prefs.getBoolean（showWelcomeScreenString，true）；如果（！WelcomeScreenShowed）{startActivity（新意图（WelcomeActivity.this，LoginReliefAccountActivity.class））；}'我不确定是（！WelcomeScreenShowed）还是（WelcomeScreenShowed），请检查它

 public class WelcomeActivity extends AppCompatActivity {

SharedPreferences prefs;
final String showWelcomeScreenString = "showWelcome";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_welcome);


    Button getStarted = findViewById(R.id.getStartedBtn);

    prefs = PreferenceManager.getDefaultSharedPreferences(WelcomeActivity.this);
    final Boolean welcomeScreenShown = prefs.getBoolean(showWelcomeScreenString, true);

    getStarted.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (welcomeScreenShown) {
                startActivity(new Intent(WelcomeActivity.this, LoginReliefAccountActivity.class));
                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean(showWelcomeScreenString, false);
                editor.apply();

            } else if(!welcomeScreenShown){
                startActivity(new Intent(WelcomeActivity.this, LoginReliefAccountActivity.class));
            }
        }
    });
}

public class MainActivity extends AppCompatActivity {

SharedPreferences prefs;
 boolean welcomeScreenShown ;
final String showWelcomeScreenString = "showWelcome";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    Button getStarted = (Button) findViewById(R.id.txt);

    prefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
    welcomeScreenShown = prefs.getBoolean(showWelcomeScreenString, true);

    getStarted.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(MainActivity.this, "welcomeScreenShown:"+welcomeScreenShown, Toast.LENGTH_SHORT).show();
            System.out.println("welcomeScreenShown:"+welcomeScreenShown);
            if (welcomeScreenShown) {
                welcomeScreenShown = false;

                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean(showWelcomeScreenString, false);
                editor.apply();
                //startActivity(new Intent(MainActivity.this, LoginReliefAccountActivity.class));

            } else if(!welcomeScreenShown){
               // System.out.println("welcomeScreenShown:"+welcomeScreenShown);
               // startActivity(new Intent(MainActivity.this, LoginReliefAccountActivity.class));
            }
        }
    });
}