夜间模式

1.修改项目中styles文件

<style name="AppTheme" parent="Theme.AppCompat.DayNight.NoActionBar">

2.使用夜间模式的设置代码,代码如下（项目）
工具包新建：

SharedPreferencesUtil

public class SharedPreferencesUtil {


    private static SharedPreferences.Editor editor;

//添加ui模式


    public static void addModeUI(Context context, boolean bool) {

        editor = context.getSharedPreferences("mode", Context.MODE_PRIVATE).edit();

        editor.putBoolean("mode_ui", bool);

        editor.commit();

    }


    /**
     *     * 是否是夜间模式
     * <p>
     *     * @param context
     * <p>
     *     * @return
     * <p>
     *    
     */
    public static int getNight(Context context) {

        boolean bool = context.getSharedPreferences("mode", Context.MODE_PRIVATE).getBoolean("mode_ui", false);

        return bool ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO;

    }

}

UIModeUtil

 public class UIModeUtil {

    /**
     *     * 夜间模式切换
     * <p>
     *    
     */

    public static void changeModeUI(AppCompatActivity activity) {

        int currentNightMode = activity.getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;

        if (currentNightMode == Configuration.UI_MODE_NIGHT_NO) {

            activity.getDelegate().setLocalNightMode(AppCompatDelegate.MODE_NIGHT_YES);

            SharedPreferencesUtil.addModeUI(activity.getBaseContext(), true);

        } else {

            activity.getDelegate().setLocalNightMode(AppCompatDelegate.MODE_NIGHT_NO);

            SharedPreferencesUtil.addModeUI(activity.getBaseContext(), false);

        }

    }

    /**
     *     * 显示当前的模式
     * <p>
     *     * @param activity
     * <p>
     *     * @param mode
     * <p>
     *    
     */

    public static void showModeUI(AppCompatActivity activity, int mode) {

        activity.getDelegate().setLocalNightMode(mode);

    }

}

MainActivity主页面

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button sc;

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

    private void initView() {
        sc = (Button) findViewById(R.id.sc);

        sc.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.sc:
                Intent intent = new Intent(this,SetActivity.class);

                startActivity(intent);
                break;
        }
    }
    //每次执行该方法检查是否设置夜间模式

    @Override

    protected void onStart() {

        super.onStart();

        int mode = SharedPreferencesUtil.getNight(this);

        UIModeUtil.showModeUI(this, mode);

    }

}

SetActivity设置页面

public class SetActivity extends AppCompatActivity {
    private AppCompatActivity activity;
    private CheckBox checkBox;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_set);
        initView();
        activity = this;

    }


    private void initView() {
        checkBox = (CheckBox) findViewById(R.id.cb);
        int mode = SharedPreferencesUtil.getNight(this);

        if (mode == AppCompatDelegate.MODE_NIGHT_YES) {

            checkBox.setChecked(true);

        } else {
            checkBox.setChecked(false);

        }
        checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                UIModeUtil.changeModeUI(activity);
                recreate();
            }
        });
    }

}