在這里談一下墨跡天氣的換膚實現方式,不過首先聲明我只是通過反編譯以及參考了一些網上其他資料的方式推測出的換膚原理, 在這里只供參考. 若大家有更好的方式, 歡迎交流.
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墨跡天氣下載的皮膚就是一個zip格式的壓縮包，在應用的時候把皮膚資源釋放到墨跡天氣應用的目錄下，更換皮膚時新的皮膚資源會替換掉老的皮膚資源每次加載的時候就是從手機硬盤上讀取圖片，這些圖片資源的命名和程序中的資源的命名保持一致，一旦找不到這些資源，可以選擇到系統默認中查找。這種實現是直接讀取了外部資源文件，在程序運行時通過代碼顯示的替換界面的背景資源。這種方式的優點是：皮膚資源的格式定義很隨意可以是zip也可以是自定義的格式，只要程序中能夠解析到資源就行，缺點是效率上的問題.
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這里需要注意的一點是，再這里對壓縮包的解壓，借助了第三方工具: ant. jar進行解壓和壓縮文件. 關于ant工具的使用，我在稍后的文章中會具體介紹.
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主要技術點:
如何去讀取zip文件中的資源以及皮膚文件存放方式
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實現方案：如果軟件每次啟動都去讀取SD卡上的皮膚文件，速度會比較慢。較好的做法是提供一個皮膚設置的界面，用戶選擇了哪一個皮膚，就把那個皮膚文件解壓縮到”/data/data/[package name]/skin”路徑下(讀取的快速及安全性)，這樣不需要跨存儲器讀取，速度較快，而且不需要每次都去zip壓縮包中讀取，不依賴SD卡中的文件，即使皮膚壓縮包文件被刪除了也沒有關系。
實現方法：
1. 在軟件的幫助或者官網的幫助中提示用戶將皮膚文件拷貝到SD卡指定路徑下。
2. 在軟件中提供皮膚設置界面。可以在菜單或者在設置中。可參考墨跡、搜狗輸入法、QQ等支持換膚的軟件。
3. 加載指定路徑下的皮膚文件，讀取其中的縮略圖，在皮膚設置界面中顯示，將用戶選中的皮膚文件解壓縮到”/data/data/[package name]/skin”路徑下。
4. 軟件中優先讀取”/data/data/[package name]/skin/”路徑下的資源。如果沒有則使用apk中的資源。
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效果圖：
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具體代碼:
1. AndroidManifest.xml:
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<?xml?version="1.0"?encoding="utf-8"?>??<manifest?xmlns:android="http://schemas.android.com/apk/res/android"??????package="com.tony.skin"?android:versionCode="1"?android:versionName="1.0">??????<uses-sdk?android:minSdkVersion="7"?/>??????<uses-permission?android:name="android.permission.WRITE_EXTERNAL_STORAGE"?/>??????<application?android:icon="@drawable/icon"?android:label="@string/app_name">??????????<activity?android:name=".Re_Skin2Activity"????????????????????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>??
2.布局文件main.xml
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<?xml?version="1.0"?encoding="utf-8"?>??<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"??????android:orientation="vertical"??????android:layout_width="fill_parent"??????android:layout_height="fill_parent"??????android:background="#d2d2d2"??????android:id="@+id/layout">??????<Button?android:text="導入皮膚"?android:id="@+id/button2"?android:layout_width="wrap_content"?android:layout_height="wrap_content"></Button>??????<Button?android:text="換膚"?android:id="@+id/button1"?android:layout_width="wrap_content"?android:layout_height="wrap_content"></Button>??????<TextView?android:id="@+id/textView1"?android:layout_width="wrap_content"?android:layout_height="wrap_content"???????????android:text="請先點擊“導入皮膚”，會將/sdcard/skin.zip導入到/sdcard/Skin_kris目錄下，然后點擊‘換膚’會將sdcard里面的素材用作皮膚"???????????android:textColor="#000"></TextView>??</LinearLayout>??
3. Re_Skin2Activity:
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package?com.tony.skin;????import?android.app.Activity;??import?android.graphics.Bitmap;??import?android.graphics.BitmapFactory;??import?android.graphics.drawable.BitmapDrawable;??import?android.os.Bundle;??import?android.view.View;??import?android.view.View.OnClickListener;??import?android.widget.Button;??import?android.widget.LinearLayout;??import?android.widget.Toast;????import?com.tony.skin.utils.ZipUtil;????public?class?Re_Skin2Activity?extends?Activity?implements?OnClickListener{??????private?Button??btnSet;??????private?Button??btnImport;??????private?LinearLayout?layout;??????????@Override??????public?void?onCreate(Bundle?savedInstanceState)?{??????????super.onCreate(savedInstanceState);??????????setContentView(R.layout.main);??????????btnSet?=?(Button)findViewById(R.id.button1);??????????btnSet.setOnClickListener(this);????????????btnImport?=?(Button)findViewById(R.id.button2);??????????btnImport.setOnClickListener(this);??????????layout?=?(LinearLayout)findViewById(R.id.layout);??????}??????@Override??????public?void?onClick(View?v)?{??????????switch?(v.getId())?{??????????case?R.id.button1:??????????????Bitmap?bitmap=?BitmapFactory.decodeFile("/sdcard/tony/skin/skin.png");?????????????????????????????BitmapDrawable?bd=new?BitmapDrawable(bitmap);??????????????btnSet.setBackgroundDrawable(bd);????????????????????????????layout.setBackgroundDrawable(new?BitmapDrawable(BitmapFactory.decodeFile("/sdcard/Skin_kris/skin/bg/bg.png")));????????????????????????????break;??????????case?R.id.button2:??????????????ZipUtil?zipp?=?new?ZipUtil(2049);??????????????System.out.println("begin?do?zip");??????????????zipp.unZip("/sdcard/skin.zip","/sdcard/Skin_kris");??????????????Toast.makeText(this,?"導入成功",?Toast.LENGTH_SHORT).show();??????????????break;??????????default:??????????????break;??????????}??????}??}??
4. ZipUtil 解壓縮處理ZIP包的工具類
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package?com.tony.skin.utils;????import?java.io.BufferedOutputStream;??import?java.io.File;??import?java.io.FileInputStream;??import?java.io.FileOutputStream;??import?java.io.IOException;??import?java.io.InputStream;??import?java.util.Enumeration;??import?java.util.zip.Deflater;????import?org.apache.tools.zip.ZipEntry;??import?org.apache.tools.zip.ZipFile;??import?org.apache.tools.zip.ZipOutputStream;????public?class?ZipUtil?{??????private?ZipFile?????????zipFile;???????private?ZipOutputStream?zipOut;?????????private??int????????????bufSize;????????private?byte[]??????????buf;???????private?int?????????????readedBytes;???????public?ZipUtil(){???????????this(512);???????}?????????public?ZipUtil(int?bufSize){???????????this.bufSize?=?bufSize;???????????this.buf?=?new?byte[this.bufSize];???????}??????????????????public?void?doZip(String?srcFile,?String?destFile)?{????????File?zipDir;??????????String?dirName;????????????zipDir?=?new?File(srcFile);??????????dirName?=?zipDir.getName();??????????try?{??????????????this.zipOut?=?new?ZipOutputStream(new?BufferedOutputStream(??????????????????????new?FileOutputStream(destFile)));??????????????????????????zipOut.setComment("comment");??????????????????????????zipOut.setEncoding("GBK");??????????????????????????zipOut.setMethod(ZipOutputStream.DEFLATED);?????????????????????????????zipOut.setLevel(Deflater.BEST_COMPRESSION);?????????????????????????????handleDir(zipDir,?this.zipOut,dirName);??????????????this.zipOut.close();??????????}?catch?(IOException?ioe)?{??????????????ioe.printStackTrace();??????????}??????}????????????private?void?handleDir(File?dir,?ZipOutputStream?zipOut,String?dirName)?throws?IOException?{??????????System.out.println("遍歷目錄："+dir.getName());??????????FileInputStream?fileIn;??????????File[]?files;????????????files?=?dir.listFiles();????????????if?(files.length?==?0)?{????????????????????????System.out.println("壓縮的 Name:"+dirName);??????????????this.zipOut.putNextEntry(new?ZipEntry(dirName));??????????????this.zipOut.closeEntry();??????????}?else?{????????????for?(File?fileName?:?files)?{????????????????????????????????????if?(fileName.isDirectory())?{??????????????????????handleDir(fileName,?this.zipOut,dirName+File.separator+fileName.getName()+File.separator);??????????????????}?else?{??????????????????????System.out.println("壓縮的 Name:"+dirName?+?File.separator+fileName.getName());??????????????????????fileIn?=?new?FileInputStream(fileName);??????????????????????this.zipOut.putNextEntry(new?ZipEntry(dirName?+?File.separator+fileName.getName()));????????????????????????while?((this.readedBytes?=?fileIn.read(this.buf))?>?0)?{??????????????????????????this.zipOut.write(this.buf,?0,?this.readedBytes);??????????????????????}????????????????????????this.zipOut.closeEntry();??????????????????}??????????????}??????????}??????}????????????public?void?unZip(String?unZipfile,?String?destFile)?{????????FileOutputStream?fileOut;??????????File?file;??????????InputStream?inputStream;????????????try?{??????????????this.zipFile?=?new?ZipFile(unZipfile);????????????????for?(Enumeration?entries?=?this.zipFile.getEntries();?entries??????????????????????.hasMoreElements();)?{??????????????????ZipEntry?entry?=?(ZipEntry)?entries.nextElement();??????????????????file?=?new?File(destFile+File.separator+entry.getName());????????????????????if?(entry.isDirectory())?{??????????????????????file.mkdirs();??????????????????}?else?{??????????????????????????????????????????File?parent?=?file.getParentFile();??????????????????????if?(!parent.exists())?{??????????????????????????parent.mkdirs();??????????????????????}????????????????????????inputStream?=?zipFile.getInputStream(entry);????????????????????????fileOut?=?new?FileOutputStream(file);??????????????????????while?((this.readedBytes?=?inputStream.read(this.buf))?>?0)?{??????????????????????????fileOut.write(this.buf,?0,?this.readedBytes);??????????????????????}??????????????????????fileOut.close();????????????????????????inputStream.close();??????????????????}??????????????}??????????????this.zipFile.close();??????????}?catch?(IOException?ioe)?{??????????????ioe.printStackTrace();??????????}??????}????????????public?void?setBufSize(int?bufSize)?{??????????this.bufSize?=?bufSize;??????}??}?
轉載于:https://www.cnblogs.com/dongweiq/p/4249931.html
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