Android 多渠道打包方式详解（下）

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来源：伯乐在线专栏作者 - joe

链接：http://android.jobbole.com/84758/

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接上文

美团方式

上面说的反编译要各种解包，打包，签名，相对也比较繁琐，然后我们可以发现，apk其实都是一个压缩包，我们直接在这个压缩包里添加对应的文件作为渠道号标记是不是又能省去上面繁琐的步奏呢？!打开一个APK文件之后你会看到META-INF这个文件夹！

apk压缩包.png

META-INF.png

美团的方式就是在这里面直接再添加一个文件，然后通过这个文件的名称来指定对应的渠道号！

话不多说，直接上代码！！

public static void addUmengChannel ( String filepath , String channel ) {

String channel_title = "umengchannel_" ;

if ( filepath . substring ( filepath . lastIndexOf ( "." ) + 1 ). toLowerCase (). equals ( "apk" )) {

String path2 = "" ;

if ( filepath . lastIndexOf ( File . separator ) >= 0 ) {

path2 = filepath . substring ( 0 , filepath . lastIndexOf ( File . separator ) + 1 ); //得到父路径

}

if ( path2 . length () != 0 ) {

File s = new File ( filepath ); //原始的apk

File t = new File ( filepath . substring ( 0 , filepath . lastIndexOf ( "." )) + "_" + channel + ".apk" ); //目标apk

if ( ! t . exists ()) { //不存在就创建

try {

t . createNewFile ();

} catch ( IOException var12 ) {

var12 . printStackTrace ();

}

}

Utils . fileChannelCopy ( s , t ); //拷贝原始apk到目标apk

File addFile = new File ( path2 + channel_title + channel ); //需要添加的渠道文件

if ( ! addFile . exists ()) {

try {

addFile . createNewFile ();

} catch ( IOException var11 ) {

var11 . printStackTrace ();

}

}

try {

Utils . addFileToExistingZip ( t , addFile ); //将新加的渠道文件添加到目标apk文件中

addFile . delete ();

} catch ( IOException var10 ) {

var10 . printStackTrace ();

}

}

}

}

public static void addFileToExistingZip ( File zipFile , File file ) throws IOException {

File tempFile = File . createTempFile ( zipFile . getName (), ( String ) null );

tempFile . delete ();

boolean renameOk = zipFile . renameTo ( tempFile ); //拷贝

if ( ! renameOk ) {

throw new RuntimeException ( "could not rename the file " + zipFile . getAbsolutePath () + " to " + tempFile . getAbsolutePath ());

} else {

byte [] buf = new byte [ 1024 ];

ZipInputStream zin = new ZipInputStream ( new FileInputStream ( tempFile ));

ZipOutputStream out = new ZipOutputStream ( new FileOutputStream ( zipFile ));

for ( ZipEntry entry = zin . getNextEntry (); entry != null ; entry = zin . getNextEntry ()) {

String in = entry . getName ();

if ( in . contains ( "umengchannel" )) { //如果有重复的就不复制回去了！

continue ;

}

out . putNextEntry ( new ZipEntry ( in ));

int len1 ;

while (( len1 = zin . read ( buf )) > 0 ) {

out . write ( buf , 0 , len1 );

}

}

zin . close ();

FileInputStream in1 = new FileInputStream ( file );

out . putNextEntry ( new ZipEntry ( "META-INF/" + file . getName ())); //创建对应的渠道文件

int len2 ;

while (( len2 = in1 . read ( buf )) > 0 ) {

out . write ( buf , 0 , len2 );

}

out . closeEntry ();

in1 . close ();

out . close ();

tempFile . delete ();

}

}

渠道包完成.png

最后送上读取相关的方法：

public static String getChannel ( Context context ) {

ApplicationInfo appinfo = context . getApplicationInfo ();

String sourceDir = appinfo . sourceDir ;

String ret = "" ;

ZipFile zipfile = null ;

try {

zipfile