在运行时在 Android 应用程序上切换灯光/白天/夜晚主题

Question

当手机设置为深色模式时。

但用户只想在此应用程序上选择主题（白天/夜晚）。

有什么想法可以在运行时以编程方式更改应用程序主题吗？

Answer 1

您可以使用它来更改它

    //Turn on night mode
    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
    //Turn off night mode
    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);

我使用这样的开关将其应用到应用程序中

Switch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
                }else {
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
                }
            }
        });

Answer 2

添加 uiMode 配置更改：

在 AndroidManifest 中

<activity
    android:name=".MyActivity"
    android:configChanges="uiMode" />

使用此代码强制光/日模式还需要重新创建活动

AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
recreate()

使用此代码强制黑暗/夜间模式还需要重新创建活动

AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
recreate()

说实话，这个 Kotlin 代码对我来说工作得很好（也应该在系统默认情况下添加主题）

val currentNightMode =
            resources.getConfiguration().uiMode and Configuration.UI_MODE_NIGHT_MASK
        when (currentNightMode) {
            Configuration.UI_MODE_NIGHT_NO -> {
                if (getAppSetting(
                        getString(R.string.key_setting_theme),
                        Context.MODE_PRIVATE
                    ) == Configuration.UI_MODE_NIGHT_YES
                )
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
                recreate()
            } // Night mode is not active, we're using the light theme
            Configuration.UI_MODE_NIGHT_YES -> {
                if (getAppSetting(
                        getString(R.string.key_setting_theme),
                        Context.MODE_PRIVATE
                    ) == Configuration.UI_MODE_NIGHT_NO
                )
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
                recreate()
            } // Night mode is active, we're using dark theme
        }

还有更多选择

MODE_NIGHT_NO. Always use the day (light) theme.
MODE_NIGHT_YES. Always use the night (dark) theme.
MODE_NIGHT_FOLLOW_SYSTEM (default). This setting follows the system’s setting, which on Android Q and above is a system setting (more on this below).
MODE_NIGHT_AUTO_BATTERY. Changes to dark when the device has its ‘Battery Saver’ feature enabled, light otherwise.
MODE_NIGHT_AUTO_TIME & MODE_NIGHT_AUTO. Changes between day/night based on the time of day.

了解更多信息 https://developer.android.com/guide/topics/ui/look-and-feel/darktheme

Answer 3

通过新的更新，我现在认为这种配置应用程序夜间模式的新方法更好。

实施并启动属性。

MaterialSwitch switchMaterial;
SharedPreferences sharedPreferences;
SharedPreferences.Editor editor;
boolean darkMode;

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_taller_screen);

    switchMaterial = findViewById(R.id.switchMaterial);
    sharedPreferences = getSharedPreferences("MODE", 
    Context.MODE_PRIVATE);
    darkMode = sharedPreferences.getBoolean("night", false);

    if(darkMode){
        switchMaterial.setChecked(true);
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
    }

    switchMaterial.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (darkMode){
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
                editor = sharedPreferences.edit();
                editor.putBoolean("night", false);
            } else {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
                editor = sharedPreferences.edit();
                editor.putBoolean("night", true);
            }
            editor.apply();
        }
    });

}

您只需要此代码即可设置夜间模式。祝你好运！