Android--用intent打开各种文件

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OK
Intent 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;
    }
}