安卓日夜模式的切换

1.在values中的colors里设置颜色的属性

<!--白天模式下的颜色-->

<colorname="colorPrimary">#3F51B5</color>

<colorname="colorPrimaryDark">#303F9F</color>

<colorname="colorAccent">#FF4081</color>

<!--夜晚模式下的颜色-->

<colorname="nightColorPrimary">#3b3b3b</color>

<colorname="nightColorPrimaryDark">#383838</color>

<colorname="nightColorAccent">#a72b55</color>

2.在style.xml中定义两组主题,也就是夜间主题和日间主题

<!-- Base application theme.日间主题-->

<stylename="AppTheme"parent="Theme.AppCompat.Light.DarkActionBar">

<!-- Customize your theme here. -->

<itemname="colorPrimary">@color/colorPrimary</item>

<itemname="colorPrimaryDark">@color/colorPrimaryDark</item>

<itemname="colorAccent">@color/colorAccent</item>

<itemname="android:textColor">@android:color/black</item>

<itemname="mainBackground">@android:color/white</item>

</style>

<!--夜间主题-->

<stylename="NightAppTheme"parent="Theme.AppCompat.Light.DarkActionBar">

<!-- Customize your theme here. -->

<itemname="colorPrimary">@color/nightColorPrimary</item>

<itemname="colorPrimaryDark">@color/nightColorPrimaryDark</item>

<itemname="colorAccent">@color/nightColorAccent</item>

<itemname="android:textColor">@android:color/white</item>

<itemname="mainBackground">@color/nightColorPrimaryDark</item>

</style>

3.创建attrs.xml文件

<!--自定义的属性方便引用-->

<attrname="mainBackground"format="color|reference"/>

4.需要夜间模式的布局引用attr自定义属性

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="?attr/mainBackground">

<!--这里引用一下我们自定义的atter资源android:background="?attr/mainBackground",

可以使用到此属性的控件带有日夜间模式切换-->

<TextView

android:id="@+id/bt_change"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="?attr/mainBackground"

android:text="日夜模式切换"/>

</RelativeLayout>

5.java代码的使用

a.判断存储的类型,

b.根据点击事件,根据类型进行日夜间的切换

public classMainActivityextendsAppCompatActivityimplementsView.OnClickListener {

privateTextViewbt_change;

//默认是日间模式

private inttheme= R.style.AppTheme;

@Override

protected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//判断是否有主题存储

if(savedInstanceState !=null) {

theme= savedInstanceState.getInt("theme");

setTheme(theme);

}

setContentView(R.layout.activity_main);

//设置点击事件

bt_change= (TextView) findViewById(R.id.bt_change);

bt_change.setOnClickListener(this);

}

@Override

public voidonClick(View view) {

switch(view.getId()) {

//根据点击事件,完成日夜切换切换的代码

caseR.id.bt_change:

//切换日夜模式代码,三元运算符比if,else效率高

theme= (theme== R.style.AppTheme) ? R.style.NightAppTheme: R.style.AppTheme;

/*if (theme == R.style.AppTheme){

theme=R.style.NightAppTheme;

}else{

theme=R.style.AppTheme;

}*/

//重新创建

recreate();

break;

default:

break;

}

}

//存

@Override

protected voidonSaveInstanceState(Bundle outState) {

super.onSaveInstanceState(outState);

outState.putInt("theme",theme);

}

//取

@Override

protected voidonRestoreInstanceState(Bundle savedInstanceState) {

super.onRestoreInstanceState(savedInstanceState);

theme= savedInstanceState.getInt("theme");

}

}