日夜间模式的切换

来源：互联网发布：阿里云校园扶持编辑：程序博客网时间：2024/05/01 05:09

1.values文件夹下属性的配置android:background="?attr/mainBackground"

--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>

--mainBackground.xml

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

--styles.xml 配置两套主题

<!-- Base application theme. --><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">    <!-- 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>

2.在layout布局中引用

android:background="?attr/mainBackground"

3.代码中

public class MainActivity extends AppCompatActivity {    // 默认是日间模式    private int theme = R.style.AppTheme;    @Override    protected void onCreate(Bundle savedInstanceState) {        // 判断是否有主题存储        if(savedInstanceState != null){            theme = savedInstanceState.getInt("theme");

  //设置主题 此方法必须在setContentView()方法之前调用

            setTheme(theme);        }        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button btn_theme = (Button) findViewById(R.id.button);        btn_theme.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                theme = (theme == R.style.AppTheme) ? R.style.NightAppTheme : R.style.AppTheme;                MainActivity.this.recreate();            }        });    }    @Override    protected void onSaveInstanceState(Bundle outState) {        super.onSaveInstanceState(outState);        outState.putInt("theme", theme);    }    @Override    protected void onRestoreInstanceState(Bundle savedInstanceState) {        super.onRestoreInstanceState(savedInstanceState);        theme = savedInstanceState.getInt("theme");    }}

0 0