Android白天夜晚模式切换实现

浏览数：43 / 时间：2015年06月11日

今天群里聊天说是实现白天夜晚模式切换不好搞，网上看了一下净是些设置theme的。仔细想了一下，白天夜晚模式的切换无非就是重新设置空间的背景色与字体颜色，如果这样的话，用broadcast receiver不是一个很好的实现方式吗？

上代码：

新建一个工程DayAndNightDemo。打开fragment_main.xml添加一个Button.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.dayandnightdemo.MainActivity$PlaceholderFragment" >

    <TextView
        android:id="@+id/main_hello"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/main_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="@string/jump" />

</RelativeLayout>

打开res/menu/main.xml添加一个菜单 

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.example.dayandnightdemo.MainActivity" >

    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:title="@string/action_settings"
        app:showAsAction="never"/>
    <item
        android:id="@+id/action_change"
        android:orderInCategory="100"
        app:showAsAction="never"/>

</menu>

到MainActivity 

package com.example.dayandnightdemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

/**
 * （用的比较新的ADT）,最下面会有demo链接，导入自己的项目中的时候记得导入你自己的appcompat_v7，
 * 具体方法是鼠标右键DayAndNightDemo--》Properties--》Android--》Library--》remove--》add。
 * 
 * @author Administrator
 * 
 */
public class MainActivity extends ActionBarActivity {
	private static MenuItem changeItem;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		if (savedInstanceState == null) {
			getSupportFragmentManager().beginTransaction()
					.add(R.id.container, new PlaceholderFragment()).commit();
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		changeItem = menu.findItem(R.id.action_change);
		if (!Util.flag)// 夜晚
			changeItem.setTitle(R.string.action_change_day);
		else
			changeItem.setTitle(R.string.action_change_night);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		} else if (id == R.id.action_change) {
			Intent intent = new Intent();
			if (item.getTitle().toString()
					.equals(getString(R.string.action_change_night)))
				Util.flag = false;// 夜晚
			else if (item.getTitle().toString()
					.equals(getString(R.string.action_change_day)))
				Util.flag = true;// 白天
			intent.setAction(Util.filter);
			this.sendBroadcast(intent);
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	/**
	 * A placeholder fragment containing a simple view.
	 */
	public static class PlaceholderFragment extends Fragment {
		View rootView;
		TextView helloText;
		Button button;
		BroadcastReceiver receiver = new BroadcastReceiver() {

			@Override
			public void onReceive(Context context, Intent intent) {
				// TODO Auto-generated method stub
				if (!Util.flag) {
					rootView.setBackgroundColor(Color.BLACK);
					helloText.setBackgroundColor(Color.BLACK);
					helloText.setTextColor(Color.WHITE);
					button.setBackgroundColor(Color.DKGRAY);
					button.setTextColor(Color.WHITE);
					MainActivity.changeItem
							.setTitle(R.string.action_change_day);
				} else if (Util.flag) {
					rootView.setBackgroundColor(Color.WHITE);
					helloText.setBackgroundColor(Color.WHITE);
					helloText.setTextColor(Color.BLACK);
					button.setBackgroundColor(Color.GRAY);
					button.setTextColor(Color.BLACK);
					MainActivity.changeItem
							.setTitle(R.string.action_change_night);
				}
			}
		};

		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			rootView = inflater.inflate(R.layout.fragment_main, container,
					false);
			helloText = (TextView) rootView.findViewById(R.id.main_hello);
			button = (Button) rootView.findViewById(R.id.main_btn);
			button.setOnClickListener(new OnClickListener() {

				@Override
				public void onClick(View v) {
					// TODO Auto-generated method stub
					Intent intent = new Intent(getActivity(),
							SecondActivity.class);
					getActivity().startActivity(intent);
				}
			});
			IntentFilter filter = new IntentFilter();
			filter.addAction(Util.filter);
			getActivity().registerReceiver(receiver, filter);
			return rootView;
		}

		@Override
		public void onDestroy() {
			// TODO Auto-generated method stub
			super.onDestroy();
			getActivity().unregisterReceiver(receiver);
			android.os.Process.killProcess(android.os.Process.myPid());
		}

	}

}

添加一个新Activity，名字叫SecondActivity 

package com.example.dayandnightdemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.widget.TextView;

public class SecondActivity extends ActionBarActivity {
	private LinearLayout linear;
	private TextView text;

	private MenuItem changeItem;

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		changeItem = menu.findItem(R.id.action_change);
		if (!Util.flag)// 夜晚
			changeItem.setTitle(R.string.action_change_day);
		else
			changeItem.setTitle(R.string.action_change_night);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		} else if (id == R.id.action_change) {

			Intent intent = new Intent();
			if (item.getTitle().toString()
					.equals(getString(R.string.action_change_night)))
				Util.flag = false;// 夜晚
			else if (item.getTitle().toString()
					.equals(getString(R.string.action_change_day)))
				Util.flag = true;// 白天

			intent.setAction(Util.filter);
			this.sendBroadcast(intent);
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_second);
		init();
		IntentFilter filter = new IntentFilter();
		filter.addAction(Util.filter);
		registerReceiver(receiver, filter);
	}

	private void init() {
		// TODO Auto-generated method stub
		linear = (LinearLayout) findViewById(R.id.second_linear);
		text = (TextView) findViewById(R.id.second_text);
		if (!Util.flag)// 夜晚
		{
			linear.setBackgroundColor(Color.BLACK);
			text.setBackgroundColor(Color.BLACK);
			text.setTextColor(Color.WHITE);
		}
	}

	BroadcastReceiver receiver = new BroadcastReceiver() {

		@Override
		public void onReceive(Context context, Intent intent) {
			// TODO Auto-generated method stub
			if (!Util.flag) {
				linear.setBackgroundColor(Color.BLACK);
				text.setBackgroundColor(Color.BLACK);
				text.setTextColor(Color.WHITE);
				changeItem.setTitle(R.string.action_change_day);
			} else if (Util.flag) {
				linear.setBackgroundColor(Color.WHITE);
				text.setBackgroundColor(Color.WHITE);
				text.setTextColor(Color.BLACK);
				changeItem.setTitle(R.string.action_change_night);
			}
		}
	};

	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		unregisterReceiver(receiver);
	}

}

在mainifest.xml中注册 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.dayandnightdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.dayandnightdemo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.example.dayandnightdemo.SecondActivity" />
    </application>

</manifest>

Util

package com.example.dayandnightdemo;

public class Util {
	public static String filter = "com.example.dayandnightdemo.change";
	public static boolean flag = true;// true表示白天模式，false表示夜晚模式

}

strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">DayAndNightDemo</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="action_change_night">夜晚</string>
    <string name="action_change_day">白天</string>
    <string name="jump">跳转</string>
    <string name="second_activity">这是个第二个activity</string>

</resources>

源码下载  （用的比较新的ADT）,最下面会有demo链接，导入自己的项目中的时候记得导入你自己的appcompat_v7， 具体方法是鼠标右键DayAndNightDemo--》Properties--》Android--》Library--》remove--》add。





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