团队冲刺第三天

今天进行了夜间模式的学习，出现的问题是：目前只能改按钮的主题，无法更改所有页面的主题。

<androidx.appcompat.widget.Toolbar
android:id="@+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
app:titleTextColor="?attr/titleColor"
app:title="设置"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

package com.xrj.night;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.widget.CompoundButton;
import android.widget.Switch;

import androidx.annotation.RequiresApi;
import androidx.appcompat.widget.Toolbar;

public class UserSettingsActivity extends BaseActivity {

private Switch nightMode;
private SharedPreferences sharedPreferences;
private Boolean night_change;

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.preference_layout);

sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
Intent intent = getIntent();
/*
if(intent.getExtras() != null) night_change = intent.getBooleanExtra("night_change", false);
else night_change = false;

*/
initView();

Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
if(isNightMode()) myToolbar.setNavigationIcon(getDrawable(R.drawable.ic_settings_black_24dp));
else myToolbar.setNavigationIcon(getDrawable(R.drawable.ic_settings_white_24dp));
}

public void initView(){
nightMode = findViewById(R.id.nightMode);
nightMode.setChecked(sharedPreferences.getBoolean("nightMode", false));
nightMode.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setNightModePref(isChecked);
setSelfNightMode();

}
});
}

private void setNightModePref(boolean night){
//通过nightMode switch修改pref中的nightMode
sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putBoolean("nightMode", night);
editor.commit();
}

private void setSelfNightMode(){
//重新赋值并重启本activity

super.setNightMode();
Intent intent = new Intent(this, UserSettingsActivity.class);
//intent.putExtra("night_change", !night_change); //重启一次，正负颠倒。最终为正值时重启MainActivity。

startActivity(intent);
finish();
}
}