android主题切换

步骤：

1.在attr.xml下定义style变量

2.在style.xml下编写不同的主题，不同主题引用attr.xml中定义好的变量设置不同的属性

3.在布局文件中控件相应属性引用attr.xml下定义style变量

4.在activity中响应事件中切换主题，例如切换成其中一个主题R.style.AppTheme;设置一个可以持久化的变量标识切换成哪一个主题

5.调用MainActivity.this.recreate();

5.在onCreate方法中根据标识主题的变量设置相应的主题MainActivity.this.setTheme(R.style.AppTheme);

效果图

 

下面直接上代码

attr.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="colorValue" format="color" />
    <attr name="background2" format="color" />
    <attr name="textSize" format="dimension" />
</resources>

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorValue">#FF00FF00</item>
        <item name="background2">@color/background_floating_material_dark</item>
        <item name="textSize">10sp</item>
    </style>


    <style name="mytheme" parent="AppTheme">
        <item name="android:windowNoTitle">true</item>
        <item name="colorValue">@color/background_floating_material_dark</item>
        <item name="background2">@color/background_floating_material_light</item>
        <item name="textSize">50sp</item>
        <!--<item name="windowActionBar">false</item>-->
    </style>

    <style name="mytext" parent="@android:style/TextAppearance.Medium">
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:textSize">?attr/textSize</item>
        <item name="android:textColor">?attr/colorValue</item>
    </style>


    <!--<style name="mytext.textsize">-->
        <!--<item name="android:textSize">50sp</item>-->
        <!--<item name="android:textColor">@color/background_floating_material_dark</item>-->
    <!--</style>-->
</resources>

strings.xml

<resources>
    <string name="app_name">TestStyleTheme</string>

    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>


</resources>

activity_main.xml

<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:background="?attr/background2"
    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=".MainActivity">

    <TextView
        android:id="@+id/tv"
        style="@style/mytext"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/btn"
        android:layout_below="@id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="切换主题"/>

</RelativeLayout>

MainActivity.java

import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

    private Button btn;
    private static String b ="false";
    PropertiesManager p;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        p = PropertiesManager.getPropertiesManager(MainActivity.this,null);
        b = p.get("theme");
        if(b==null){
            b = "false";
        }
        if(b.equals("false")) {
            MainActivity.this.setTheme(R.style.AppTheme);
        }else{
            MainActivity.this.setTheme(R.style.mytheme);
        }
        setContentView(R.layout.activity_main);
        btn = (Button)findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @TargetApi(Build.VERSION_CODES.HONEYCOMB)
            @Override
            public void onClick(View v) {
                if(b.equals("false")) {
                    b = "true";
                }else{
                     b = "false";
                }
                p.set("theme",b);
                MainActivity.this.recreate();
            }
        });
    }

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="test.teststyletheme" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".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>
    </application>

</manifest>

PropertiesManager.java 用户保存切换主题状态

import android.content.Context;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;

public class PropertiesManager {
	public static PropertiesManager pm;
	Context mContext;
	public String configPath;

	public static PropertiesManager getPropertiesManager(Context context,
			String configPath) {
		if (pm == null) {
			pm = new PropertiesManager();
			pm.mContext = context;
			pm.configPath = configPath;
		}
		return pm;
	}

	private final static String APP_CONFIG = "config";

	private Properties get() {
		FileInputStream fis = null;
		Properties props = new Properties();
		try {
			// 读取files目录下的config
			// fis = activity.openFileInput(APP_CONFIG);

			// 读取app_config目录下的config
			File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE);
			if (configPath != null) {
				fis = new FileInputStream(configPath + File.separator
						+ APP_CONFIG);
			} else {
				fis = new FileInputStream(dirConf.getPath() + File.separator
						+ APP_CONFIG);
			}
			props.load(fis);
		} catch (Exception e) {
		} finally {
			try {
				fis.close();
			} catch (Exception e) {
			}
		}
		return props;
	}

	private void setProps(Properties p) {
		FileOutputStream fos = null;
		try {
			// 把config建在files目录下
			// fos = activity.openFileOutput(APP_CONFIG, Context.MODE_PRIVATE);

			// 把config建在(自定义)app_config的目录下
			
			File conf = null;
			if(configPath!=null){
				conf = new File(new File(configPath), APP_CONFIG);
			}else{
				File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE);
				conf = new File(dirConf, APP_CONFIG);
			}
			
			fos = new FileOutputStream(conf);

			p.store(fos, null);
			fos.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				fos.close();
			} catch (Exception e) {
			}
		}
	}

	private void set(Properties ps) {
		Properties props = get();
		props.putAll(ps);
		setProps(props);
	}

	public String get(String key) {
		Properties props = get();
		return (props != null) ? props.getProperty(key) : null;
	}

	public void set(String key, String value) {
		Properties props = get();
		props.setProperty(key, value);
		setProps(props);
	}

	public void remove(String... key) {
		Properties props = get();
		for (String k : key)
			props.remove(k);
		setProps(props);
	}
}