【Android】用于打开各种文件的intent

直接上代码！
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;  }}
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