首先是下载，不再赘述。
然后定义打开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; }
打开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 it Intent intent = getPdfFileIntent("/mnt/sdcard/Tian/t0.pdf"); startActivity(intent); } } });
PS：
Android用于打开各种文件的intent
importandroid.app.Activity;
importandroid.content.Intent;
importandroid.net.Uri;
importandroid.net.Uri.Builder;
importjava.io.File;
importandroid.content.Intent;
//自定义androidIntent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?
//Intentit = getPdfFileIntent("file:///android_asset/helphelp.pdf");
//下面这些都OK
//Intentit = getHtmlFileIntent("/mnt/sdcard/tutorial.html");//SD卡主目录
//Intentit = 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
//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目录下
//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 = newIntent("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 = 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获取一个用于打开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获取一个用于打开文本文件的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获取一个用于打开音频文件的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( 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获取一个用于打开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获取一个用于打开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获取一个用于打开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中声明权限：
<!-- 在SDCard中创建与删除文件权限 -->
<uses-permissionandroid:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<!-- 往SDCard写入数据权限-->