首先是下載，不再贅述。

然后定義打開pdf的Intent

/*** Get PDF file Intent*/public Intent getPdfFileIntent(String path){Intent i = new Intent(Intent.ACTION_VIEW);i.addCategory(Intent.CATEGORY_DEFAULT);i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK );Uri uri = Uri.fromFile(new File(path));i.setDataAndType(uri, "application/pdf");return i;}
打開

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

android用于打開各種文件的intent【原創(chuàng)】

?

http://hi.baidu.com/wishwingliao/blog/item/e2172297a880a87855fb96cb.html

?

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.net.Uri;

importandroid.net.Uri.Builder;

importjava.io.File;

importandroid.content.Intent;

?

//自定義androidIntent類，

//可用于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(quán)限訪問其它APK里的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(tǒng)內(nèi)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獲取一個用于打開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獲取一個用于打開圖片文件的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獲取一個用于打開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獲取一個用于打開文本文件的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獲取一個用于打開音頻文件的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獲取一個用于打開視頻文件的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獲取一個用于打開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獲取一個用于打開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獲取一個用于打開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獲取一個用于打開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(quán)限：

??????? <!-- 在SDCard中創(chuàng)建與刪除文件權(quán)限 -->

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

??????? <!-- 往SDCard寫入數(shù)據(jù)權(quán)限-->

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

總結(jié)

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