日夜間模式切換

原創

2020-02-22 06:33

在values裏的colors.xml裏

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!--日間模式下的顏色-->
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>

    <!--夜間模式下的顏色-->
    <color name="nightColorPrimary">#3b3b3b</color>
    <color name="nightColorPrimaryDark">#383838</color>
    <color name="nightColorAccent">#a72b55</color>
</resources>

然後在values裏的styles.xml裏

<resources>

    <!-- 日間模式 -->
    <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>

    <!-- 夜間模式 -->
    <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>

然後在values裏創建attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!--reference 引用-->
    <attr name="mainBackground" format="color|reference"></attr>
</resources>

在相對佈局中或者線性佈局中添加:

android:background="?attr/mainBackground"

MainActivity裏

import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private SharedPreferences sharedPreferences;
    private SharedPreferences.Editor edit;
    private Button button;
    //默認的日間模式
    private int theme = R.style.AppTheme;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

	super.onCreate(savedInstanceState);

//方法1 //恢復數據做判空

	if (savedInstanceState != null) {

	 theme = savedInstanceState.getInt("theme");

	//設置主題 此方法必須在setContentView()之前調用

	setTheme(theme);

//        //方法2

//        sharedPreferences = getSharedPreferences("jiangjun",MODE_PRIVATE);

//        edit = sharedPreferences.edit();

//        boolean riye = sharedPreferences.getBoolean("riye", false);

//        if (riye){

//            setTheme(R.style.NightAppTheme);//        }else {//            setTheme(R.style.AppTheme);//        }        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.riye);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //方法1                //切換日夜間模式                theme = (theme == R.style.AppTheme) ? R.style.NightAppTheme : R.style.AppTheme;//                //方法2//                boolean riye1 = sharedPreferences.getBoolean("riye", false);//                if (riye1){//                    edit.putBoolean("riye",false);//                    edit.commit();//                }else {//                    edit.putBoolean("riye",true);//                    edit.commit();//                }                //重新創建                recreate();                            }        });    }    //保存數據    @Override    protected void onSaveInstanceState(Bundle outState) {        super.onSaveInstanceState(outState);        outState.putInt("theme", theme);    }    //恢復數據    @Override    protected void onRestoreInstanceState(Bundle savedInstanceState) {        super.onRestoreInstanceState(savedInstanceState);        theme = savedInstanceState.getInt("theme");    }}