android夜间模式的实现

项目中要用到夜间模式，今天我就来总结，我是怎么实现的吧

实现原理：我们把当前的主题存放在sp中，每当activity启动之前调用setTheme方法设置相应的主题，setTheme方法一定要在super.onCreate()方法之前执行。

(1)在values文件夹下，分别写一套夜间模式下的布局(theme_dark.xml)

和白天模式下的布局(theme_light.xml)，

theme_dark.xml:

<?xml version="1.0" encoding="utf-8"?><resources xmlns:android="http://schemas.android.com/apk/res/android">    <style name="AppTheme_Night" >        <item name="username_double">@color/night_gray_1</item>        <item name="gray_1_double">@color/gray_1_night</item>        <item name="gray_3_double">@color/gray_3_night</item>        <item name="source_bg">@drawable/source_bg_night</item>    </style>   </resources>

theme_light.xml:

<?xml version="1.0" encoding="utf-8"?><resources xmlns:android="http://schemas.android.com/apk/res/android">    <style name="AppTheme_Light" >        <item name="username_double">@color/light_gray_1</item>         <item name="gray_1_double">@color/light_gray_1</item>         <item name="gray_3_double">@color/gray_3</item>         <item name="source_bg">@drawable/source_bg_light</item>    </style></resources>

(2) 在values文件下新建一个theme_attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>   <attr name="username_double" format="color" />   <attr name="gray_1_double" format="color" />    <attr name="gray_3_double" format="color" />    <attr name="source_bg" format="reference" /></resources>

前面3个是颜色属性，后面是一个drawable类型，分别和theme_light.xml和theme_night一一对应。当然还可以是状态选择器，shape图形资源。

(3) 在activity中我们要在super.onCreate()方法之前调用setTheme()方法,由于项目中的每个activity都要调用该方法，所以我把这个方法放在BaseActivity中实现。

public class BaseActivity extends Activity {protected int skin;public Context mContext;SharedPreferences sp;@Overrideprotected void onCreate(Bundle savedInstanceState) {setThemeMode(getSkinTypeValue());super.onCreate(savedInstanceState);Global.mContext = this;this.mContext = this;sp = getSharedPreferences("AppSkinType", Context.MODE_PRIVATE);}protected void setThemeMode(SkinType skinType) {switch (skinType) {case Light:setTheme(R.style.AppTheme_Light);break;case Night:setTheme(R.style.AppTheme_Night);break;default:setTheme(R.style.AppTheme_Light);break;}}protected SkinType getSkinTypeValue() {if (sp == null) {sp = getSharedPreferences("AppSkinType", Context.MODE_PRIVATE);}int i = sp.getInt("AppSkinType", 0);switch (i) {case 0:return SkinType.Light;        case 1:return SkinType.Night;default:break;}return SkinType.Light;}protected void saveSkinValue(int skin) {if (sp == null) {sp = getSharedPreferences("AppSkinType", Context.MODE_PRIVATE);}Editor editor = sp.edit();editor.putInt("AppSkinTypeValue", skin);editor.commit();}}

(4）下面是我写的一个列子，布局很简单，就是一个textView和chebox，checkBox选中的时候便设置成夜间模式，没有选中便为白天模式

代码如下：

package com.example.activity;import com.example.night_mode.R;import android.annotation.SuppressLint;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.CompoundButton.OnCheckedChangeListener;public class MainActivity extends BaseActivity {private CheckBox cbSetting;private String Tag = "mainActivity";private Button btnForward;private View llNight;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);llNight = findViewById(R.id.ll_night);btnForward = (Button) findViewById(R.id.forward);cbSetting = (CheckBox) findViewById(R.id.cb_setting);cbSetting.setOnCheckedChangeListener(new OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if (cbSetting.isChecked()) {// 设置夜间模式saveSkinValue(1);llNight.setBackgroundDrawable(getResources().getDrawable(R.drawable.source_bg_night));} else {// 设置白天模式saveSkinValue(0);llNight.setBackgroundDrawable(getResources().getDrawable(R.drawable.source_bg_light));}}});btnForward.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(MainActivity.this,SecondActivity.class);startActivity(intent);}});}}

代码已贴出

android夜间模式的实现

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