Question

我想使用SharedPreference只启动一次启动活动，它是如何发生的。任何帮助将受到高度赞赏。谢谢

Thread thread;
MediaPlayer audio;

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


    audio = MediaPlayer.create(MainActivity.this, R.raw.iphone);
    audio.start();


    if (first_run == true){
    thread = new Thread(){
        @Override
        public void run() {

            try {
                sleep(4000);
                Intent intent = new Intent(MainActivity.this, SplashTwo.class);
                startActivity(intent);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }finally {
                finish();
                audio.release();
            }
        }
    };
        thread.start();
    }
}

Answer 1

试试这个：

声明

public static final String MyPREFERENCES = "MyPrefs";
public static final String ID = "idKey";
SharedPreferences sharedPreferences;

现在你的onCreate（）：

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

    sharedPreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
    audio = MediaPlayer.create(MainActivity.this, R.raw.iphone);
    audio.start();
    String first = (sharedPreferences.getString("First", ""));
    if (!first.equals("true")) {
        thread = new Thread(){
            @Override
            public void run() {

                try {
                    sleep(4000);
                    Intent intent = new Intent(MainActivity.this, SplashTwo.class);
                    startActivity(intent);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    editor.putString("First", "true");
                    editor.commit();
                    finish();
                    audio.release();
                }
            }
        };
            thread.start();
        }
    }

Answer 2

而不是sharedprefrence，我建议您使用静态布尔值，如 - isFirstTime并默认设置为true，并在第二个活动（在splash旁边）设置它到false。每当你杀死应用程序静态值将变为死亡。检查Splash的onCreate -

if(!isFirstTime){
    goToNextActivity();
 }else{
//continue splash code
}

如果你想使用共享首选项，那么使用相同的逻辑，取一个布尔值并将其保存在共享首选项中 -

SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME,     MODE_PRIVATE).edit();
 editor.putBoolean("isFirstTime", true);
 editor.commit();

并在下一个活动中将其设置为false或清除值。通过调用editor.clear();并在共享pref具有某些值或isFirstTime时检查启动，并相应地执行下一个代码。

如何使用SharedPreferences将splash活动启动一次

2 个答案: