Android中实现应用切换主题机制

Android中实现应用切换主题机制

2011-07-28 18:07 1294人阅读 评论(9) 收藏 举报

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:

Java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, ""));

}

}

[java] view
plaincopy

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。