日夜间模式切换

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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

<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><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>

自创： attrs.xml

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

// 默认是日间模式private int theme = R.style.AppTheme;

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    if(savedInstanceState != null){        theme = savedInstanceState.getInt("theme");        setTheme(theme);    }

Button btn_theme = (Button) findViewById(R.id.btn_theme);btn_theme.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {        theme = (theme == R.style.AppTheme) ? R.style.NightAppTheme : R.style.AppTheme;        Toast.makeText(HomePage.this, "点击", Toast.LENGTH_SHORT).show();        HomePage.this.recreate();    }});

@Overrideprotected void onSaveInstanceState(Bundle outState) {    //super.onSaveInstanceState(outState);    outState.putInt("theme", theme);}@Overrideprotected void onRestoreInstanceState(Bundle savedInstanceState) {    super.onRestoreInstanceState(savedInstanceState);    theme = savedInstanceState.getInt("theme");}

布局

android:background="?attr/mainBackground"

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