OpenFileUtils

public class OpenFileUtils {

    public static Intent openFilea(String filePath) {
        File file = new File(filePath);
        if (!file.exists()) return null;
        /* 取得擴展名 */
        String end = file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().length()).toLowerCase();
        /* 依擴展名的類型決定MimeType */
        if (end.equals("m4a") || end.equals("mp3") || end.equals("mid") || end.equals("xmf") || end.equals("ogg") || end.equals("wav")) {
            return getAudioFileIntent(filePath);
        } else if (end.equals("3gp") || end.equals("mp4")) {
            return getAudioFileIntent(filePath);
        } else if (end.equals("jpg") || end.equals("gif") || end.equals("png") || end.equals("jpeg") || end.equals("bmp")) {
            return getImageFileIntent(filePath);
        } else if (end.equals("apk")) {
            return getApkFileIntent(filePath);
        } else if (end.equals("ppt")) {
            return getPptFileIntent(filePath);
        } else if (end.equals("xls") || end.equals("xlsx")) {
            return getExcelFileIntent(filePath);
        } else if (end.equals("doc") || end.equals("docx")) {
            return getWordFileIntent(filePath);
        } else if (end.equals("pdf")) {
            return getPdfFileIntent(filePath);
        } else if (end.equals("chm")) {
            return getChmFileIntent(filePath);
        } else if (end.equals("txt")) {
            return getTextFileIntent(filePath, false);
        } else {
            return getAllIntent(filePath);
        }
    }

    //Android獲取一個用於打開APK文件的intent
    public static Intent getAllIntent(String param) {
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setAction(android.content.Intent.ACTION_VIEW);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "*/*");
        return intent;
    }

    //Android獲取一個用於打開APK文件的intent
    public static Intent getApkFileIntent(String param) {
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setAction(android.content.Intent.ACTION_VIEW);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "application/vnd.android.package-archive");
        return intent;
    }

    //Android獲取一個用於打開VIDEO文件的intent
    public static Intent getVideoFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("oneshot", 0);
        intent.putExtra("configchange", 0);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "video/*");
        return intent;
    }

    //Android獲取一個用於打開AUDIO文件的intent
    public static Intent getAudioFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("oneshot", 0);
        intent.putExtra("configchange", 0);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "audio/*");
        return intent;
    }

    //Android獲取一個用於打開Html文件的intent
    public static Intent getHtmlFileIntent(String param) {
        Uri uri = Uri.parse(param).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param).build();
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.setDataAndType(uri, "text/html");
        return intent;
    }

    //Android獲取一個用於打開圖片文件的intent
    public static Intent getImageFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "image/*");
        return intent;
    }

    //Android獲取一個用於打開PPT文件的intent
    public static Intent getPptFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
        return intent;
    }

    //Android獲取一個用於打開Excel文件的intent
    public static Intent getExcelFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "application/vnd.ms-excel");
        return intent;
    }

    //Android獲取一個用於打開Word文件的intent
    public static Intent getWordFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "application/msword");
        return intent;
    }

    //Android獲取一個用於打開CHM文件的intent
    public static Intent getChmFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "application/x-chm");
        return intent;
    }

    //Android獲取一個用於打開文本文件的intent
    public static Intent getTextFileIntent(String param, boolean paramBoolean) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (paramBoolean) {
            Uri uri1 = Uri.parse(param);
            intent.setDataAndType(uri1, "text/plain");
        } else {
            Uri uri2 = Uri.fromFile(new File(param));
            intent.setDataAndType(uri2, "text/plain");
        }
        return intent;
    }

    //Android獲取一個用於打開PDF文件的intent
    public static Intent getPdfFileIntent(String param) {
        Intent intent = new Intent("android.intent.action.VIEW");
        intent.addCategory("android.intent.category.DEFAULT");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "application/pdf");
        return intent;
    }

    public static Intent openFile(String filePath) {
        File file = new File(filePath);
        if (!file.exists()) return null;
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        //設置intent的Action屬性
        intent.setAction(Intent.ACTION_VIEW);
        //獲取文件file的MIME類型
        String type = getMIMEType(file.getName());
        //設置intent的data和Type屬性。
        intent.setDataAndType(/*uri*/Uri.fromFile(file), type);
        return intent;
    }

    public static String getMIMEType(String fName) {
        String type = "*/*";
        //獲取後綴名前的分隔符"."在fName中的位置。
        int dotIndex = fName.lastIndexOf(".");
        if (dotIndex < 0) {
            return type;
        }
        /* 獲取文件的後綴名*/
        String end = fName.substring(dotIndex, fName.length()).toLowerCase();
        if (end == "") return type;
        //在MIME和文件類型的匹配表中找到對應的MIME類型。
        for (int i = 0; i < MIME_MapTable.length; i++) { //MIME_MapTable??在這裏你一定有疑問，這個MIME_MapTable是什麼？
            if (end.equals(MIME_MapTable[i][0]))
                type = MIME_MapTable[i][1];
        }
        return type;
    }

    public static final String[][] MIME_MapTable = {
            //{後綴名，MIME類型}
            {".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"},
            {".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
            {".xls", "application/vnd.ms-excel"},
            {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
            {".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"},
            {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
            {".prop", "text/plain"},
            {".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/plain"},
            {".z", "application/x-compress"},
            {".zip", "application/x-zip-compressed"},
            {"", "*/*"}
    };