Android：下載後打開PDF格式文件

首先是下載，不再贅述。

然後定義打開pdf的Intent

1. /** 
2.     * Get PDF file Intent 
3.     */  
4.    public Intent getPdfFileIntent(String path){  
5.     Intent i = new Intent(Intent.ACTION_VIEW);  
6.     i.addCategory(Intent.CATEGORY_DEFAULT);  
7.     i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK );  
8.     Uri uri = Uri.fromFile(new File(path));  
9.     i.setDataAndType(uri, "application/pdf");  
10.     return i;  
11. }  

打開

1. btnDownload.setOnClickListener(new View.OnClickListener() {  
2.             public void onClick(View v) {  
3.                 //You need to open another thread to download file ,   
4.                 //so that it cannot disturb the main UI thread.   
5.                 final HttpDownloader loader = new HttpDownloader(getApplicationContext());  
6.                 int result = loader.download("http://xxx.pdf", "Tian/", "t0.pdf");  
7.                 Log.d("PDFActivity.java","Download result: "+result);  
8.                 if(result == 0 || result == 1){ // Success,open it   
9.                     Intent intent = getPdfFileIntent("/mnt/sdcard/Tian/t0.pdf");  
10.                     startActivity(intent);  
11.                 }  
12.             }  
13.         });  

PS：

Android用於打開各種文件的intent

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.net.Uri;

importandroid.net.Uri.Builder;

importjava.io.File;

importandroid.content.Intent;

 

//自定義androidIntent類，

//可用於獲取打開以下文件的intent

//PDF,PPT,WORD,EXCEL,CHM,HTML,TEXT,AUDIO,VIDEO

 

示例:

//這個不行，可能是因為PDF.apk程序沒有權限訪問其它APK裡的asset資源文件,又或者是路徑寫錯?

//Intentit = getPdfFileIntent("file:///android_asset/helphelp.pdf");

//下面這些都OK

//Intentit = getHtmlFileIntent("/mnt/sdcard/tutorial.html");//SD卡主目錄

//Intentit = 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

//Intentit = getPdfFileIntent("/system/etc/helphelp.pdf");

//Intentit = getWordFileIntent("/system/etc/help.doc");

//Intentit = getExcelFileIntent("/mnt/sdcard/Book1.xls")

//Intentit = getPptFileIntent("/mnt/sdcard/download/Android_PPT.ppt");//SD卡的download目錄下

//Intentit = getVideoFileIntent("/mnt/sdcard/ice.avi");

//Intentit = getAudioFileIntent("/mnt/sdcard/ren.mp3");

//Intentit = getImageFileIntent("/mnt/sdcard/images/001041580.jpg");

//Intentit = getTextFileIntent("/mnt/sdcard/hello.txt",false);

 

startActivity(it );

 

publicclass MyIntent

{

 

//android獲取一個用於打開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 = newIntent("android.intent.action.VIEW");

    intent.setDataAndType(uri,"text/html");

    return intent;

  }

 

//android獲取一個用於打開圖片文件的intent

  public static Intent getImageFileIntent(String param )

  {

    Intent intent = newIntent("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獲取一個用於打開PDF文件的intent

  public static Intent getPdfFileIntent( Stringparam )

  {

    Intent intent = newIntent("android.intent.action.VIEW");

   intent.addCategory("android.intent.category.DEFAULT");

   intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    Uriuri = Uri.fromFile(new File(param ));

    intent.setDataAndType(uri,"application/pdf");

    return intent;

  }

 

//android獲取一個用於打開文本文件的intent

 public static Intent getTextFileIntent( Stringparam, 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獲取一個用於打開音頻文件的intent

  public static Intent getAudioFileIntent(String param )

  {

    Intent intent = newIntent("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獲取一個用於打開視頻文件的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獲取一個用於打開CHM文件的intent

  public static Intent getChmFileIntent( Stringparam )

  {

    Intent intent = newIntent("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獲取一個用於打開Word文件的intent

  public static Intent getWordFileIntent(String param )

  {

    Intent intent = newIntent("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獲取一個用於打開Excel文件的intent

  public static Intent getExcelFileIntent(String param )

  {

    Intent intent = newIntent("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獲取一個用於打開PPT文件的intent

  public static Intent getPptFileIntent( Stringparam )

  {

    Intent intent = newIntent("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中聲明權限：

        <!-- 在SDCard中創建與刪除文件權限 -->

        <uses-permissionandroid:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

        <!-- 往SDCard寫入數據權限-->

        <uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE" />