Android中实现应用切换主题机制

文章出处:http://gundumw100.iteye.com/blog/1052260

 

一直很想弄清楚好多应用中是如何实现换皮肤这项功能的，花了下午点时间，查了下资料也实现了个切换主题的Demo; 

首先要感谢下这位大哥,参阅了下他写的文件http://www.eoeandroid.com/forum-viewthread-tid-31756-highlight-%E7%9A%AE%E8%82%A4.html 

好了，废话不多说了，该切换主题的demo里面一共实现了两个功能，其一，搜索已经安装的皮肤，其二，应用安装的皮肤。 

主项目包名为org.leepood.skindemo,主题项目的包名为org.leepood.skin.blue,org.leepood.skin.red,等等，只要前缀是org.leepood.skin.就行。 

首先是查找已安装主题的代码: 

 

 

package org.leepood.skindemo;  
  
import java.util.ArrayList;  
import java.util.List;  
  
import android.app.Activity;  
import android.app.ProgressDialog;  
import android.content.Context;  
import android.content.Intent;  
import android.content.SharedPreferences;  
import android.content.pm.PackageInfo;  
import android.content.pm.PackageManager;  
import android.content.pm.PackageManager.NameNotFoundException;  
import android.content.res.Resources;  
import android.os.Bundle;  
import android.os.Handler;  
import android.os.Message;  
import android.view.ContextMenu;  
import android.view.LayoutInflater;  
import android.view.MenuItem;  
import android.view.View;  
import android.view.ViewGroup;  
import android.view.ContextMenu.ContextMenuInfo;  
import android.view.View.OnCreateContextMenuListener;  
import android.widget.BaseAdapter;  
import android.widget.ImageView;  
import android.widget.ListView;  
import android.widget.TextView;  
import android.widget.Toast;  
import android.widget.AdapterView.AdapterContextMenuInfo;  
  
public class Main extends Activity implements SharedPreferences.OnSharedPreferenceChangeListener{  
  
    private ListView listview;  
    private Context c;  
    private Handler mHandler;  
    private ProgressDialog pDialog;  
    private SkinAdapter adapter;  
    private SharedPreferences sp;  
    static final int MESSAGE_SEARCHED_SKIN=0;  
    static final int MESSAGE_SEARCHING_SKIN=MESSAGE_SEARCHED_SKIN+1;  
    static final int MESSAGE_SEARCHED_SKIN_FOR_NONTHING=MESSAGE_SEARCHING_SKIN+1;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        init();  
        pDialog.show();  
        new Thread(serachSkin).start();  
  
    }  
  
    private void init()  
    {  
  
        c=this;  
        mHandler=new Handler(){  
  
            @Override  
            public void handleMessage(Message msg) {  
                switch(msg.what)  
                {  
                case MESSAGE_SEARCHED_SKIN:  
                    ArrayList  
 skins=(ArrayList  
) msg.obj;//获取skins  
                    adapter=new SkinAdapter(c, skins);  
                    listview.setAdapter(adapter);  
                    Toast.makeText(c, "查找到已经安装的皮肤", 1).show();  
                    pDialog.dismiss();  
                    break;  
                case MESSAGE_SEARCHED_SKIN_FOR_NONTHING:  
                    Toast.makeText(c, "未查找到任何皮肤", 1).show();  
                    pDialog.dismiss();  
                }  
            }  
  
        };  
        sp=this.getSharedPreferences("config",Context.MODE_WORLD_WRITEABLE);  
        sp.registerOnSharedPreferenceChangeListener(this);  
  
        listview=(ListView) findViewById(R.id.list);  
        listview.setItemsCanFocus(false);  
        listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE);  
  
        pDialog=new ProgressDialog(this);  
        pDialog.setMessage("正在查找已经安装的皮肤");  
  
        listview.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {  
  
            public void onCreateContextMenu(ContextMenu menu, View v,  
                    ContextMenuInfo menuInfo) {  
                menu.add("使用该主题");  
  
            }  
        });  
  
    }  
  
    private Runnable serachSkin =new Runnable(){  
  
        public void run() {  
            PackageManager manager=c.getPackageManager();  
            List  
 packages=manager.getInstalledPackages(PackageManager.PERMISSION_GRANTED);  
  
            ArrayList  
 skins=new ArrayList  
();  
            for(PackageInfo info:packages)  
            {  
                //System.out.println(info.packageName);  
                if(info.packageName.startsWith("org.leepood.skin."))  
                {  
                    skins.add(info);  
                }  
            }  
            if(skins.size()>0)  
            {  
                Message msg=mHandler.obtainMessage();  
                msg.obj=skins;  
                msg.what=MESSAGE_SEARCHED_SKIN;  
                mHandler.sendMessage(msg);  
            }  
            else  
            {  
                mHandler.sendEmptyMessage(MESSAGE_SEARCHED_SKIN_FOR_NONTHING);  
            }  
  
        }  
  
    };  
    private class SkinAdapter extends BaseAdapter  
    {  
  
        LayoutInflater mInflater;  
        ArrayList  
 datas;  
        PackageManager manager;  
        public SkinAdapter(Context c,ArrayList  
 datas)  
        {  
  
            this.datas=datas;  
             mInflater=LayoutInflater.from(c);  
             manager=c.getPackageManager();  
        }  
  
        public int getCount() {  
  
            return datas.size();  
        }  
  
        public Object getItem(int position) {  
  
            return datas.get(position);  
        }  
  
        public long getItemId(int position) {  
  
            return 0;  
        }  
  
        public View getView(int position, View convertView, ViewGroup parent) {  
  
            if(convertView==null)  
            {  
                convertView=mInflater.inflate(R.layout.skin_item, null);  
            }  
            ImageView icon=(ImageView) convertView.findViewById(R.id.skin_icon);  
            TextView  skin_name=(TextView) convertView.findViewById(R.id.skin_name);  
            PackageInfo info=datas.get(position);  
            icon.setImageDrawable(info.applicationInfo.loadIcon(manager));  
            skin_name.setText(info.applicationInfo.loadLabel(manager));  
            return convertView;  
        }  
  
    }  
  
    public void onThemeChanged(String newThemePackageName) {  
        try {  
  
            Context themeContext=this.createPackageContext(newThemePackageName, CONTEXT_IGNORE_SECURITY);  
            Resources res=themeContext.getResources();  
            setControlsStyle(res);  
  
        } catch (NameNotFoundException e) {  
  
            e.printStackTrace();  
        }  
  
    }  
  
    private void setControlsStyle(Resources res)  
    {  
        listview.setBackgroundColor(res.getColor(R.color.ListView_bg));  
  
    }  
  
    @Override  
    public boolean onContextItemSelected(MenuItem item) {  
        AdapterContextMenuInfo menuInfo=(AdapterContextMenuInfo)item.getMenuInfo();  
        PackageInfo info=(PackageInfo) adapter.getItem(menuInfo.position);  
  
        sp.edit().putString("themePackage", info.packageName).commit();  
        return super.onContextItemSelected(item);  
    }  
  
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,  
            String key) {  
        System.out.println("themeChange");  
        onThemeChanged(sharedPreferences.getString(key, ""));  
  
    }  
  
} 

 

 

这段代码的含义就是去查找系统中安装的包名，若以org.leepood.skin.开头则说明该包为主题包,将其加入listview中显示出来。代码中使用了多线程避免时间过长堵塞UI。程序将当前主题配置保存在SharedPreference中,为SharedPreference注册了一个监听函数，当其值发生改变时自动调用新的样式。当然，这只是个demo而已,一开始加载Activity没有去读取主题，这个可以由大家自己去实现。 
最后贴张图片: 

 


Android实现主题切换机制2 
昨天花了点时间实现了主题的切换，但是里面还是不够灵活，回去想了想可以用继承和回调函数来进一步灵活更改主题，现在记录下我的实现办法 
首先一个自定义类ThemeActivity继承自Activity，这个类是以后所有Activity的父类，在这个类里面定义了一个接口 

public interface OnThemeChangedListener 
{ 
public void onChanged(String newThemePackageName); 

} 
接下来，首先是要给ThemeActivity注册一个主题切换的listener,代码如下: 

public void setOnThemeChangedListener(OnThemeChangedListener listener) 
{ 
this.listener=listener; 
} 
然后就是注册一个SharedPreference来监听xml的变化，当发生改变的时候自动去调用listener.onChanged方法，将新的主题包名传递过去，代码如下: 

public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, 
String key) { 
if(key.equals("themePackage")) 
{ 
listener.onChanged(sp.getString("themePackage", "")); 
} 

} 
接着在继承于ThemeActivity的子类里面首先是setOnThemeChangedListener.接着用一个匿名内部类搞定。好啦，代码可以见附件啦