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" />