android夜间模式的实现

                                       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;

	@Override
	protected 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;

	@Override
	protected 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() {
			@Override
			public 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() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(MainActivity.this,
						SecondActivity.class);
				startActivity(intent);
			}
		});
	}
	
}

 

   代码已贴出