public abstract class BaseFragment extends Fragment { static final String TAG = "tag"; public final String ACTION = "NIGHT_SWITCH"; protected BroadcastReceiver receiver; protected IntentFilter filter; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setNightMode(); filter = new IntentFilter(); filter.addAction(ACTION); receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.d(TAG, "onReceive: needRefresh"); needRefresh(); } }; registerReceiver(receiver, filter); } public boolean isNightMode(){ SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext()); return sharedPreferences.getBoolean("nightMode", false); } public void setNightMode(){ if(isNightMode()) { SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext()); Log.d(TAG, "setNightMode: " + sharedPreferences.getBoolean("nightMode", false)); this.setTheme(R.style.NightTheme); } else setTheme(R.style.DayTheme); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(receiver); } protected abstract void needRefresh(); }这段代码有问题,怎么改
时间: 2024-02-14 09:12:03 浏览: 22
这段代码中的问题在于 `setTheme()` 方法不能在 Fragment 中使用,而应该在 Activity 中使用。因此,我们需要将设置主题的代码移到 Activity 中。以下是修改后的代码:
```
public abstract class BaseFragment extends Fragment {
static final String TAG = "tag";
public final String ACTION = "NIGHT_SWITCH";
protected BroadcastReceiver receiver;
protected IntentFilter filter;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
filter = new IntentFilter();
filter.addAction(ACTION);
receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.d(TAG, "onReceive: needRefresh");
needRefresh();
}
};
requireActivity().registerReceiver(receiver, filter);
}
public boolean isNightMode(){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(requireContext());
return sharedPreferences.getBoolean("nightMode", false);
}
@Override
public void onDestroy() {
super.onDestroy();
requireActivity().unregisterReceiver(receiver);
}
protected abstract void needRefresh();
}
```
请注意,我们将 `registerReceiver()` 和 `unregisterReceiver()` 方法中的 `getContext()` 改为了 `requireContext()`,这是因为在 Fragment 中使用 `getContext()` 可能会返回 null,而 `requireContext()` 可以确保返回非 null 的 Context。