Android DownloadManager API-下载后打开文件?
我面临通过DownloadManager API成功下载后打开下载文件的问题。在我的代码中:Android DownloadManager API-下载后打开文件?,android,download-manager,Android,Download Manager,我面临通过DownloadManager API成功下载后打开下载文件的问题。在我的代码中: Uri uri=Uri.parse("http://www.nasa.gov/images/content/206402main_jsc2007e113280_hires.jpg"); Environment .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) .mkdirs(); lastDownl
Uri uri=Uri.parse("http://www.nasa.gov/images/content/206402main_jsc2007e113280_hires.jpg");
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
.mkdirs();
lastDownload = mgr.enqueue(new DownloadManager.Request(uri)
.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI |
DownloadManager.Request.NETWORK_MOBILE)
.setAllowedOverRoaming(false)
.setTitle("app update")
.setDescription("New version 1.1")
.setShowRunningNotification(true)
.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "a.apk"));
Cursor c=mgr.query(new DownloadManager.Query().setFilterById(lastDownload));
if(c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS)) == 8) {
try {
mgr.openDownloadedFile(c.getLong(c.getColumnIndex(DownloadManager.COLUMN_ID)));
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d("MGR", "Error");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d("MGR", "Error");
}
}
问题在于何时调用isif(c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS))=8)
。我得到了状态-1和一个例外。有没有更好的方法,如何使用DownloadManager API
打开下载的文件?在我的示例中,我正在下载一个大图像,在实际情况中,我将下载一个APK
文件,我需要在udpate之后立即显示一个安装对话框
编辑:我发现status=8是在成功下载之后。您可能有不同的“检查成功下载”方法
谢谢下载完成后,您需要注册接收器:
registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
还有一个接收器处理器
BroadcastReceiver onComplete=new BroadcastReceiver() {
public void onReceive(Context ctxt, Intent intent) {
// Do Something
}
};
买吧,我建议你检查一下,不要让我把所有东西都偷走
编辑:
作为建议,我现在还不建议使用API9:http://developer.android.com/resources/dashboard/platform-versions.html
有很多方法可以解决这个问题,比如像我一样创建自己的下载处理程序,因为我们不想疏远大部分android用户群,因此您需要:
创建用于处理文件下载的
我建议创建一个下载对话框(如果你说它是一个大文件,我会让它出现在通知区)
然后,您需要处理文件的打开:
protected void openFile(String fileName) {
Intent install = new Intent(Intent.ACTION_VIEW);
install.setDataAndType(Uri.fromFile(new File(fileName)),
"MIME-TYPE");
startActivity(install);
}
问题 Android DownloadManager API-下载后打开文件 解决方案
/**
* Used to download the file from url.
* <p/>
* 1. Download the file using Download Manager.
*
* @param url Url.
* @param fileName File Name.
*/
public void downloadFile(final Activity activity, final String url, final String fileName) {
try {
if (url != null && !url.isEmpty()) {
Uri uri = Uri.parse(url);
activity.registerReceiver(attachmentDownloadCompleteReceive, new IntentFilter(
DownloadManager.ACTION_DOWNLOAD_COMPLETE));
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setMimeType(getMimeType(uri.toString()));
request.setTitle(fileName);
request.setDescription("Downloading attachment..");
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
DownloadManager dm = (DownloadManager) activity.getSystemService(Context.DOWNLOAD_SERVICE);
dm.enqueue(request);
}
} catch (IllegalStateException e) {
Toast.makeText(activity, "Please insert an SD card to download file", Toast.LENGTH_SHORT).show();
}
}
/**
* Used to get MimeType from url.
*
* @param url Url.
* @return Mime Type for the given url.
*/
private String getMimeType(String url) {
String type = null;
String extension = MimeTypeMap.getFileExtensionFromUrl(url);
if (extension != null) {
MimeTypeMap mime = MimeTypeMap.getSingleton();
type = mime.getMimeTypeFromExtension(extension);
}
return type;
}
/**
* Attachment download complete receiver.
* <p/>
* 1. Receiver gets called once attachment download completed.
* 2. Open the downloaded file.
*/
BroadcastReceiver attachmentDownloadCompleteReceive = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, 0);
openDownloadedAttachment(context, downloadId);
}
}
};
/**
* Used to open the downloaded attachment.
*
* @param context Content.
* @param downloadId Id of the downloaded file to open.
*/
private void openDownloadedAttachment(final Context context, final long downloadId) {
DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(downloadId);
Cursor cursor = downloadManager.query(query);
if (cursor.moveToFirst()) {
int downloadStatus = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
String downloadLocalUri = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
String downloadMimeType = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_MEDIA_TYPE));
if ((downloadStatus == DownloadManager.STATUS_SUCCESSFUL) && downloadLocalUri != null) {
openDownloadedAttachment(context, Uri.parse(downloadLocalUri), downloadMimeType);
}
}
cursor.close();
}
/**
* Used to open the downloaded attachment.
* <p/>
* 1. Fire intent to open download file using external application.
*
* 2. Note:
* 2.a. We can't share fileUri directly to other application (because we will get FileUriExposedException from Android7.0).
* 2.b. Hence we can only share content uri with other application.
* 2.c. We must have declared FileProvider in manifest.
* 2.c. Refer - https://developer.android.com/reference/android/support/v4/content/FileProvider.html
*
* @param context Context.
* @param attachmentUri Uri of the downloaded attachment to be opened.
* @param attachmentMimeType MimeType of the downloaded attachment.
*/
private void openDownloadedAttachment(final Context context, Uri attachmentUri, final String attachmentMimeType) {
if(attachmentUri!=null) {
// Get Content Uri.
if (ContentResolver.SCHEME_FILE.equals(attachmentUri.getScheme())) {
// FileUri - Convert it to contentUri.
File file = new File(attachmentUri.getPath());
attachmentUri = FileProvider.getUriForFile(activity, "com.freshdesk.helpdesk.provider", file);;
}
Intent openAttachmentIntent = new Intent(Intent.ACTION_VIEW);
openAttachmentIntent.setDataAndType(attachmentUri, attachmentMimeType);
openAttachmentIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
try {
context.startActivity(openAttachmentIntent);
} catch (ActivityNotFoundException e) {
Toast.makeText(context, context.getString(R.string.unable_to_open_file), Toast.LENGTH_LONG).show();
}
}
}
/**
*用于从url下载文件。
*
* 1. 使用下载管理器下载文件。
*
*@param-url。
*@param fileName文件名。
*/
公共无效下载文件(最终活动活动、最终字符串url、最终字符串文件名){
试一试{
if(url!=null&&!url.isEmpty()){
Uri=Uri.parse(url);
activity.registerReceiver(附件下载CompleteReceive,新的意向过滤器(
DownloadManager.ACTION_DOWNLOAD_COMPLETE);
DownloadManager.Request=新的DownloadManager.Request(uri);
setMimeType(getMimeType(uri.toString());
setTitle(文件名);
request.setDescription(“下载附件”);
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.request.VISIBILITY\u VISIBLE\u NOTIFY\u完成);
request.setDestinationNexternalPublicDir(Environment.DIRECTORY\u下载,文件名);
DownloadManager dm=(DownloadManager)activity.getSystemService(Context.DOWNLOAD\u服务);
dm.enqueue(请求);
}
}捕获(非法状态){
Toast.makeText(活动“请插入SD卡以下载文件”,Toast.LENGTH_SHORT.show();
}
}
/**
*用于从url获取MimeType。
*
*@param-url。
*@返回给定url的Mime类型。
*/
私有字符串getMimeType(字符串url){
字符串类型=null;
字符串扩展名=MimeTypeMap.getFileExtensionFromUrl(url);
if(扩展名!=null){
MimeTypeMap mime=MimeTypeMap.getSingleton();
type=mime.getMimeTypeFromExtension(扩展名);
}
返回类型;
}
/**
*附件下载完整的接收器。
*
* 1. 一旦附件下载完成,接收方将被调用。
* 2. 打开下载的文件。
*/
BroadcastReceiver attachmentDownloadCompleteReceive=new BroadcastReceiver(){
@凌驾
公共void onReceive(上下文、意图){
String action=intent.getAction();
if(DownloadManager.ACTION\u DOWNLOAD\u COMPLETE.equals(ACTION)){
long downloadId=intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID,0);
openDownloadedAttachment(上下文,downloadId);
}
}
};
/**
*用于打开下载的附件。
*
*@param上下文内容。
*@param downloaddid要打开的下载文件的Id。
*/
私有void opendownloadeAttachment(最终上下文上下文,最终长下载ID){
下载管理器下载管理器=(下载管理器)context.getSystemService(context.DOWNLOAD\u服务);
DownloadManager.Query Query=新建DownloadManager.Query();
query.setFilterById(下载ID);
Cursor=downloadManager.query(查询);
if(cursor.moveToFirst()){
int downloadStatus=cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
String downloadLocalUri=cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
String downloadMimeType=cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_MEDIA_TYPE));
if((downloadStatus==DownloadManager.STATUS_SUCCESSFUL)&&downloadLocalUri!=null){
openDownloadedAttachment(上下文,Uri.parse(downloadLocalUri),downloadMimeType);
}
}
cursor.close();
}
/**
*用于打开下载的附件。
*
* 1. Fire意图使用外部应用程序打开下载文件。
*
* 2. 注:
*2.a。我们不能直接将fileUri共享给其他应用程序(因为我们将从Android7.0获得FileUriExposedException)。
*2.b。因此,我们只能与其他应用程序共享内容uri。
*2.c。我们必须在清单中声明FileProvider。
*2.c。参考-https://developer.android.com/reference/android/support/v4/content/FileProvider.html
*
*@param上下文。
*@param attachmentUri要打开的下载附件的Uri。
*@param attachmentMimeType下载附件的MimeType。
*/
私有void opendownloadeAttachment(最终上下文上下文、Uri attachmentUri、最终字符串attachmentMimeType){
if(attachmentUri!=null){
//获取内容Uri。
if(ContentResolver.SCHEME_FILE.equals)(attachmentUri.getSche
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.freshdesk.helpdesk.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_path"/>
</provider>
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="attachment_file" path="."/>
</paths>