android - 我想使用共享首选项在 android 中实现一次性注册屏幕，但我无法获得以前的共享首选项

Question

我想检索以前存储的共享首选项。我已经实现了第二项 Activity 。我希望该用户只输入一次数据

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

    sp = this.getSharedPreferences(TEXT_VALUE_KEY, Context.MODE_PRIVATE);


    completed = sp.getBoolean(TEXT_VALUE_KEY, false);

    if (completed == true) {
        Intent intent = new Intent();
        intent.setClass(this, Welcome.class);
        Toast.makeText(getBaseContext(), "User Already Registered", Toast.LENGTH_SHORT).show();
        startActivity(intent);
        finish();
    } 

    number = (EditText) findViewById(R.id.user_number);
    btn= (Button) findViewById(R.id.Register_Button);






}

Answer 1

您似乎没有保存和检索共享首选项的权利。要保存首选项，试试这个，它更简单。

SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences( this);
Editor edit = sp.edit();
edit.putBoolean("completed",x);
//You can put more objects
edit.commit();

要获得共享偏好，

SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences.(this);
boolean completed = sp.getBoolean("completed",false);

此外，您正在输入字符串并尝试获取 bool 值。