日夜模式切换

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rea 文件下values 里面 colors.xml

<resources>    <color name="colorPrimary">#3F51B5</color>    <color name="colorPrimaryDark">#303F9F</color>    <color name="colorAccent">#FF4081</color>    <color name="nightColorPrimary">#3b3b3b</color>    <color name="nightColorPrimaryDark">#383838</color>    <color name="nightColorAccent">#a72b55</color></resources>

styles.xml

<resources>    <!-- Base application theme. 日间模式-->    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">        <!-- Customize your theme here. -->        <item name="colorPrimary">@color/colorPrimary</item>        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>        <item name="colorAccent">@color/colorAccent</item>        <item name="android:textColor">@android:color/black</item>        <item name="mainBackground">@android:color/white</item>    </style>    <!-- Base application theme. 夜间模式-->    <style name="NightAppTheme" parent="Theme.AppCompat.Light.DarkActionBar">        <!-- Customize your theme here. -->        <item name="colorPrimary">@color/nightColorPrimary</item>        <item name="colorPrimaryDark">@color/nightColorPrimaryDark</item>        <item name="colorAccent">@color/nightColorAccent</item>        <item name="android:textColor">@android:color/white</item>        <item name="mainBackground">@color/nightColorPrimaryDark</item>    </style></resources>

values里建一个attrs.xml

<resources>    <!--reference 引用-->    <attr name="mainBackground" format="color|reference"></attr></resources>布局<Button        android:id="@+id/bt_change"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="?attr/mainBackground"        android:text="日夜间模式切换"/>

代码

public class MainActivity extends AppCompatActivity {
    //默认的日间模式
    private int theme = R.style.AppTheme;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //恢复数据做判空
        if (savedInstanceState != null) {
            theme = savedInstanceState.getInt("theme");
            //设置主题此方法必须在setContentView()之前调用
            setTheme(theme);

        }

        setContentView(R.layout.activity_main);
        //找控件
        Button bt_change = (Button) findViewById(R.id.bt_change);

        bt_change.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //切换日夜间模式
                theme = (theme == R.style.AppTheme) ? R.style.NightAppTheme : R.style.AppTheme;
                //重新创建
                recreate();

            }
        });

    }

    //保存数据
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("theme", theme);
    }

    //恢复数据
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        theme = savedInstanceState.getInt("theme");
    }
}

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