读取apk缩略图 根据文件路径取得缩略图

package com.android.providers.downloads.test.util;

import java.io.File;

import java.util.HashMap;

import java.util.Map;

import android.content.pm.ApplicationInfo;

import android.content.res.AssetManager;

import android.content.res.Resources;

import android.graphics.drawable.Drawable;

import aurora.app.AuroraActivity;

import com.android.providers.downloads.test.R;

public class FileIconLoader {

private static final Map<String, Integer> sIconMap = new HashMap<String, Integer>();

static public class AppSnippet {

CharSequence label;

Drawable icon;

public AppSnippet(CharSequence label, Drawable icon) {

this.label = label;

this.icon = icon;

}

}

static {

addItem(new String[] { "apk" }, R.drawable.file_icon_apk_light);

addItem(new String[] { "flac" }, R.drawable.file_icon_flac_light);

addItem(new String[] { "aac" }, R.drawable.file_icon_aac_light);

addItem(new String[] { "mp3" }, R.drawable.file_icon_mp3_light);

addItem(new String[] { "wma" }, R.drawable.file_icon_wma_light);

addItem(new String[] { "wav" }, R.drawable.file_icon_wav_light);

addItem(new String[] { "mid" }, R.drawable.file_icon_mid_light);

addItem(new String[] { "amr" }, R.drawable.file_icon_amr_light);

addItem(new String[] { "m4a" }, R.drawable.file_icon_m4a_light);

addItem(new String[] { "ogg" }, R.drawable.file_icon_ogg_light);

addItem(new String[] { "3gpp" }, R.drawable.file_icon_3gpp_light);

addItem(new String[] { "mp4", "wmv", "mpeg", "m4v", "3gp", "3g2",

"3gpp2", "asf" }, R.drawable.file_icon_video_light);

addItem(new String[] { "jpg", "jpeg", "gif", "png", "bmp", "wbmp" },

R.drawable.file_icon_picture_light);

addItem(new String[] { "txt", "log", "xml", "ini", "lrc" },

R.drawable.file_icon_txt_light);

addItem(new String[] { "doc", "ppt", "docx", "pptx", "xsl", "xslx", },

R.drawable.file_icon_office_light);

addItem(new String[] { "pdf" }, R.drawable.file_icon_pdf_light);

addItem(new String[] { "zip" }, R.drawable.file_icon_zip_light);

addItem(new String[] { "gnz" }, R.drawable.file_icon_theme_light);

addItem(new String[] { "rar" }, R.drawable.file_icon_rar_light);

}

/**

* Utility method to load application label

*

* @param pContext context of package that can load the resources

* @param appInfo ApplicationInfo object of package whose resources are to be loaded

* @param snippetId view id of app snippet view

*/

public static AppSnippet getAppSnippet(

AuroraActivity pContext, ApplicationInfo appInfo, File sourceFile) {

final String archiveFilePath = sourceFile.getAbsolutePath();

Resources pRes = pContext.getResources();

AssetManager assmgr = new AssetManager();

assmgr.addAssetPath(archiveFilePath);

Resources res = new Resources(assmgr, pRes.getDisplayMetrics(), pRes.getConfiguration());

CharSequence label = null;

// Try to load the label from the package's resources. If an app has not explicitly

// specified any label, just use the package name.

if (appInfo.labelRes != 0) {

try {

label = res.getText(appInfo.labelRes);

} catch (Resources.NotFoundException e) {

}

}

if (label == null) {

label = (appInfo.nonLocalizedLabel != null) ?

appInfo.nonLocalizedLabel : appInfo.packageName;

}

Drawable icon = null;

// Try to load the icon from the package's resources. If an app has not explicitly

// specified any resource, just use the default icon for now.

if (appInfo.icon != 0) {

try {

icon = res.getDrawable(appInfo.icon);

} catch (Resources.NotFoundException e) {

}

}

// if (icon == null) {

// icon = pContext.getPackageManager().getDefaultActivityIcon();

// }

return new AppSnippet(label, icon);

}

private static final void addItem(String[] files, int id) {

for (String s : files) {

sIconMap.put(s, id);

}

}

public static final int getFileIconIdByExtName(String fileName) {

Integer id = sIconMap.get(fileName);

if (id == null) {

return R.drawable.file_icon_default_light;

} else {

return id;

}

}

public static final int getFileIconId(String fileName) {

if (fileName == null) {

return R.drawable.file_icon_null_light;

}

if (!Utils.isSDCardReady()) {

return R.drawable.gn_app_icon_default;

}

if (!new File(fileName).exists()) {

return R.drawable.file_icon_deleted;

}

int idx = fileName.lastIndexOf('.');

int drawable = getFileIconIdByExtName(fileName.substring(idx + 1));

return drawable;

}

/**

*

* 根据文件后缀名获得对应的MIME类型。

*

* @param file

*/

private String getMIMEType(File file)

{

String type = "*/*";

String fName = file.getName();

// 获取后缀名前的分隔符"."在fName中的位置。

int dotIndex = fName.lastIndexOf(".");

if (dotIndex < 0) {

return type;

}

/* 获取文件的后缀名 */

String end = fName.substring(dotIndex, fName.length()).toLowerCase();

if (end == "")

return type;

// 在MIME和文件类型的匹配表中找到对应的MIME类型。

for (int i = 0; i < MIME_MapTable.length; i++) {

if (end.equals(MIME_MapTable[i][0])) {

type = MIME_MapTable[i][1];

break;

}

}

return type;

}

// 建立一个MIME类型与文件后缀名的匹配表

private final String[][] MIME_MapTable = {

// {后缀名， MIME类型}

{ ".3gp", "video/3gpp" },

{ ".apk", "application/vnd.android.package-archive" },

{ ".asf", "video/x-ms-asf" }, { ".avi", "video/x-msvideo" },

{ ".bin", "application/octet-stream" }, { ".bmp", "image/bmp" },

{ ".c", "text/plain" }, { ".class", "application/octet-stream" },

{ ".conf", "text/plain" }, { ".cpp", "text/plain" },

{ ".doc", "application/msword" },

{ ".exe", "application/octet-stream" }, { ".gif", "image/gif" },

{ ".gtar", "application/x-gtar" }, { ".gz", "application/x-gzip" },

{ ".h", "text/plain" }, { ".htm", "text/html" },

{ ".html", "text/html" }, { ".jar", "application/java-archive" },

{ ".java", "text/plain" }, { ".jpeg", "image/jpeg" },

{ ".jpg", "image/jpeg" }, { ".js", "application/x-javascript" },

{ ".log", "text/plain" }, { ".m3u", "audio/x-mpegurl" },

{ ".m4a", "audio/mp4a-latm" }, { ".m4b", "audio/mp4a-latm" },

{ ".m4p", "audio/mp4a-latm" }, { ".m4u", "video/vnd.mpegurl" },

{ ".m4v", "video/x-m4v" }, { ".mov", "video/quicktime" },

{ ".mp2", "audio/x-mpeg" }, { ".mp3", "audio/x-mpeg" },

{ ".mp4", "video/mp4" },

{ ".mpc", "application/vnd.mpohun.certificate" },

{ ".mpe", "video/mpeg" }, { ".mpeg", "video/mpeg" },

{ ".mpg", "video/mpeg" }, { ".mpg4", "video/mp4" },

{ ".mpga", "audio/mpeg" },

{ ".msg", "application/vnd.ms-outlook" }, { ".ogg", "audio/ogg" },

{ ".pdf", "application/pdf" }, { ".png", "image/png" },

{ ".pps", "application/vnd.ms-powerpoint" },

{ ".ppt", "application/vnd.ms-powerpoint" },

{ ".prop", "text/plain" },

{ ".rar", "application/x-rar-compressed" },

{ ".rc", "text/plain" }, { ".rmvb", "audio/x-pn-realaudio" },

{ ".rtf", "application/rtf" }, { ".sh", "text/plain" },

{ ".tar", "application/x-tar" },

{ ".tgz", "application/x-compressed" }, { ".txt", "text/plain" },

{ ".wav", "audio/x-wav" }, { ".wma", "audio/x-ms-wma" },

{ ".wmv", "audio/x-ms-wmv" },

{ ".wps", "application/vnd.ms-works" },

// {".xml", "text/xml"},

{ ".xml", "text/plain" }, { ".z", "application/x-compress" },

{ ".zip", "application/zip" }, { "", "*/*" } };

}