日夜间模式

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建立Arrts

<attr name="mainBackground" format="color|reference"></attr>

</resources>

颜色

<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>

style

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        
        <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>
    
    <style name="NightAppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        
        <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>

Activity

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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