Android--使用Intent打开各种文件

1.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
2.错误事例
Intent it = getPdfFileIntent(“file:///android_asset/helphelp.pdf”);
原因:可能是因为程序没有权限访问其它APK里的asset文件夹下的资源文件,又或者是路径写错。

import android.content.Intent;import android.net.Uri;import java.io.File;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;    }}