各位大大好:
想請教一下，我用SharedPreferences可以幫我記住頁面中的edittext的資料
但我希望這頁面所儲存的資料在其他頁面也能用，我該怎麼做?
以下是第一頁面程式碼:

public class MainActivity extends Activity {
  private Button login;
    private EditText acc;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        login = (Button)findViewById(R.id.login);
        acc=(EditText)findViewById(R.id.acc);
         SharedPreferences myrecord=getPreferences(Activity.MODE_PRIVATE);
         String name_str=myrecord.getString("acc", "");
         acc.setText(name_str);
         login.setOnClickListener(getDBRecord);
    }
  
    private Button.OnClickListener getDBRecord = new Button.OnClickListener() {
        public void onClick(View v) {
           SharedPreferences myrecord=getPreferences(Activity.MODE_PRIVATE); 
           SharedPreferences.Editor edit=myrecord.edit();
           edit.putString("acc", acc.getText().toString());
           edit.commit(); 
            
        }
    }; 
}

以下是第二頁面程式碼:

public class Mymenu extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mymenu);
        SharedPreferences spref = getApplication().getSharedPreferences("acc", Context.MODE_PRIVATE);

        String strValue = spref.getString("acc", null);
        mytoast(strValue+"");
    }
    private void mytoast(String str)
    {
        Toast toast=Toast.makeText(this, str, Toast.LENGTH_LONG);
        toast.setGravity(Gravity.CENTER, 0, 0);
        toast.show();
    }
}

但怎麼印出來都是null
我在第一頁面已經確定值有被記憶了....
謝謝