Android用於開啟各種檔案的intent

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;
 
//自訂Android Intent類，

//可用於擷取開啟以下檔案的intent
//PDF,PPT,WORD,EXCEL,CHM,HTML,TEXT,AUDIO,VIDEO
 
樣本:
//這個不行，可能是因為PDF.apk程式沒有許可權訪問其它APK裡的asset資源檔,又或者是路徑寫錯?
//Intent it = getPdfFileIntent("file:///Android_asset/helphelp.pdf");
//下面這些都OK
//Intent it = getHtmlFileIntent("/mnt/sdcard/tutorial.html");//SD卡主目錄
//Intent it = getHtmlFileIntent("/sdcard/tutorial.html");//SD卡主目錄,這樣也可以
Intent it = getHtmlFileIntent("/system/etc/tutorial.html");//系統內部的etc目錄
//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目錄下
//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擷取一個用於開啟HTML檔案的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擷取一個用於開啟圖片檔案的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擷取一個用於開啟PDF檔案的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擷取一個用於開啟文字檔的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擷取一個用於開啟音頻檔案的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擷取一個用於開啟視頻檔案的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擷取一個用於開啟CHM檔案的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擷取一個用於開啟Word檔案的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擷取一個用於開啟Excel檔案的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擷取一個用於開啟PPT檔案的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;
  }
}

注意：
一定要在Manifest.xml中聲明許可權：
 <!-- 在SDCard中建立與刪除檔案許可權 -->
 <uses-permission
Android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
 <!-- 往SDCard寫入資料許可權 -->
 <uses-permission
Android:name="android.permission.WRITE_EXTERNAL_STORAGE" />