import android.app.Activity;import android.content.Intent;import android.net.Uri;import android.net.Uri.Builder;import java.io.File;import android.content.Intent;//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//错误示例://这个不行，可能是因为PDF.apk程序没有权限访问其它APK里的asset资源文件,又或者是路径写错?//Intent it = getPdfFileIntent("file:///android_asset/helphelp.pdf");//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;    }}