android程序如何應用多種主題風格

原理：主程序與主題apk使用相同的sharedUserId, 使得主程序可以訪問主題apk包中的資源

 

主程序：MainSkin.apk

主題包：SkinTest1.apk, SkinTest2.apk

 

MainSkin實現一個activity來加載SkinTest1或SkinTest2中的資源，給自己設置不同主題的背景圖片和按鈕圖片

 

MainSkin的AndroidManifest.xml如下：

 

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.huyuke.mainskin" android:sharedUserId="com.huyuke.mainskin"> <application android:label="@string/app_name" android:launchMode="singleInstance" android:debuggable="true" android:allowTaskReparenting="true"> <activity android:name="MainSkinActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <receiver android:name="SkinPackagesManager"> <intent-filter> <action android:name="android.intent.action.PACKAGE_ADDED" /> <action android:name="android.intent.action.PACKAGE_CHANGED" /> <action android:name="android.intent.action.PACKAGE_DATA_CLEARED" /> <action android:name="android.intent.action.PACKAGE_INSTALL" /> <action android:name="android.intent.action.PACKAGE_REMOVED" /> <action android:name="android.intent.action.PACKAGE_REPLACED" /> <action android:name="android.intent.action.PACKAGE_RESTARTED" /> <action android:name="android.intent.action.EXTERNAL_APPLICATIONS_AVAILABLE"/> <action android:name="android.intent.action.EXTERNAL_APPLICATIONS_UNAVAILABLE"/> <data android:scheme="package"/> </intent-filter> </receiver> </application> </manifest>

MainSkin的Acitivity定義：

package com.huyuke.mainskin; import android.app.Activity; import android.content.Context; import android.content.pm.PackageManager.NameNotFoundException; import android.content.pm.PackageInfo; import android.content.res.Resources; import android.os.Bundle; import android.os.Process; import android.widget.LinearLayout; import android.widget.Button; import android.view.View; import android.view.View.OnClickListener; import android.util.Log; import java.util.ArrayList; public class MainSkinActivity extends Activity implements OnClickListener { private static final String TAG = "MainSkinActivity"; private LinearLayout mBg; private Button mBtn; private Resources defaultRes = null; private ArrayList<String> mSkinPkgs = new ArrayList<String>(); private int mCurrSkinIndex = 0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); setTitle(R.string.theme_name); mBg = (LinearLayout) findViewById(R.id.linear_layout_1); mBtn = (Button) findViewById(R.id.btn_change_skin); mBg.setBackgroundResource(R.drawable.bg); mBtn.setBackgroundResource(R.drawable.btn_normal); mBtn.setOnClickListener(this); getSkinPackages(); } public void onClick(View v) { String skinPkgToSet= mSkinPkgs.get(mCurrSkinIndex); mCurrSkinIndex++; if (mCurrSkinIndex == mSkinPkgs.size()) { mCurrSkinIndex = 0; } applySkin(skinPkgToSet); } private void applySkin(String skinPkg){ Context skinContext; try { skinContext = this.createPackageContext(skinPkg, Context.CONTEXT_IGNORE_SECURITY); } catch (NameNotFoundException e) { Log.e(TAG, "createPackageContext exception: " + e); e.printStackTrace(); return; } Resources res = skinContext.getResources(); /* OR try { res = getPackageManager().getResourcesForApplication(skinPkg); } catch (NameNotFoundException e) { Log.e(TAG, "getResourcesForApplication exception: " + e); return; } */ mBg.setBackgroundDrawable(res.getDrawable(res.getIdentifier("bg", "drawable", skinPkg))); mBtn.setBackgroundDrawable(res.getDrawable(res.getIdentifier("btn_normal", "drawable", skinPkg))); setTitle(res.getString(res.getIdentifier("theme_name", "string", skinPkg))); } private void getSkinPackages() { String[] skinPkgs = getPackageManager().getPackagesForUid(Process.myUid()); String self = getPackageName(); for (String skinPackage: skinPkgs) { Log.i(TAG, "package for this user: " + skinPackage); if (!(self.equals(skinPackage))) { Log.i(TAG, "this is a skin package"); mSkinPkgs.add(skinPackage); } } Log.i(TAG, "I have " + mSkinPkgs.size() + " skins"); } }

 

同時MainSkin中需要放一套默認圖片資源

 

主題包中不需要代碼，只需要資源文件和在manifest裏面聲明和主程序MainSkin使用相同的sharedUserId即可，

在這兩個主題包中分別放了兩套不同的圖片，每套圖包括一張activity背景圖和一張button背景圖

如SkinTest1的AndroidManifest.xml內容如下：

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.huyuke.skintest1" android:sharedUserId="com.huyuke.mainskin"> </manifest> 

 

顯示效果：