说明：//自定义android Intent类，//可用于获取打开以下文件的intent//PDF,PPT,WORD,EXCEL,CHM,HTML,TEXT,AUDIO,VIDEO

下面这些都OKIntent it = getHtmlFileIntent("/mnt/sdcard/tutorial.html");
SD卡主目录
Intent it = getHtmlFileIntent("/sdcard/tutorial.html");

SD卡主目录,这样也可以
Intent it = getHtmlFileIntent("/system/etc/tutorial.html");

系统内部的etc目录
Intent it = getPdfFileIntent("/system/etc/helphelp.pdf");
Intent it = getWordFileIntent("/system/etc/help.doc");
Intent it = getExcelFileIntent("/mnt/sdcard/Book1.xls")
Intent it = getPptFileIntent("/mnt/sdcard/download/Android_PPT.ppt");

SD卡的download目录下
Intent it = getVideoFileIntent("/mnt/sdcard/ice.avi");
Intent it = getAudioFileIntent("/mnt/sdcard/ren.mp3");
Intent it = getImageFileIntent("/mnt/sdcard/images/001041580.jpg");
Intent it = getTextFileIntent("/mnt/sdcard/hello.txt",false);startActivity( it );

public class MyIntent {
//android获取一个用于打开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获取一个用于打开图片文件的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获取一个用于打开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;
}

//android获取一个用于打开文本文件的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获取一个用于打开音频文件的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获取一个用于打开视频文件的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获取一个用于打开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获取一个用于打开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获取一个用于打开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获取一个用于打开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;
}

}