3

我switchCompat.setChecked(true)在FragmentonViewCreated(...)中执行。它第一次运行良好，但从 BackStack 回来后无法运行。日志显示为true ，但SwitchCompat的UI状态为off。奇怪的是OnCheckedChangeListener中onCheckedChanged的名为isChecked的参数也为false。 谁能告诉我为什么？

switchCompat.isChecked()

片段

  @Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    ......other code......

    initialSnooze();

}


private void initialSnooze() {
    mSwitchSnooze.setChecked(mAlarm.isSnooze());
    Log.d("TAG", "initialSnooze: "+mAlarm.toString()+" "+mSwitchSnooze.isChecked());
}

切换到下一个片段

 private void switchFragment(Fragment fragment,String tag){
        FragmentTransaction fragmentTransaction=getSupportFragmentManager().beginTransaction();
        fragmentTransaction.addToBackStack(tag);        
        fragmentTransaction.replace(android.R.id.content, fragment, tag);
        fragmentTransaction.commit();
    }

从 BackStack 到返回按钮

    @Override
public void onBackPressed() {
    //回退栈中有Fragment
    int count = getSupportFragmentManager().getBackStackEntryCount();
    if (count == 0) {
        super.onBackPressed();
    } else {
        getSupportFragmentManager().popBackStack();
    }
}

**在第二个片段中**

    @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
        mAlarm = getArguments().getParcelable(PARAM_ALARM);
    }
    mAlarm.setSnooze(true);
}
4

1 回答 1

4

调用 initialSnooze(); 在 onResume()

于 2016-07-18T08:50:09.840 回答