The binary content of a file is encapsulated in the DriveContents class. You can choose to work with the file contents either by using the InputStream and OutputStream classes, or by working with the ParcelFileDescriptor.
The access methods available to you depend on the mode the file was opened in. To support offline cases, the API implements a sync engine that runs in the background to merge upstream and downstream changes as network access is available and to resolve conflicts.
Because the Drive Android API automatically handles downloading the file contents if the file has not been synced locally, the process of reading from a file is similar to using local storage. The basic steps to read a file are:. In order to be able to read a file, you must start by opening its DriveContents resource in DriveFile.
The DriveResourceClient. If the file is not synced with the local storage, it retrieves the file from the Drive service and returns a DriveContents resource. For example:. A DriveContents resource contains a temporary copy of the file's binary stream that is only available to your application. If multiple applications attempt to access the same file, there are no race conditions between DriveContents resources. In this situation, the last write operation is the final state of the content.
Handling the response requires you to check if the call was successful. If the call was successful, you can retrieve the DriveContents resource. This resource contains methods to retrieve an InputStream or ParcelFileDescriptor to read the file's binary contents.
The following example demonstrates how to retrieve a file's DriveContents :. You can attach a OpenFileCallback to inform users of the download progress in a ProgressDialog to improve the user experience. To listen to the download progress, open the file contents with a DownloadProgressListeneras shown in this example:.
In the event that the file has already been synced locally, the system does not call the onProgress listener.
Word Document Processing Android APIs
A DriveContents resource provides a java. InputStream you can use to read the binary contents of the opened file. The sample below illustrates how to read from a DriveContents resource and convert the binary contents into a String object.
However, you can consume the input stream in whatever way your application and data format require. Writing to a file follows a similar procedure to reading a file, with the difference being that you use either the OutputStream or the ParcelFileDescriptor class to write to the file, determined by the mode you opened the file in. Just as with reading files, you must open contents in order to write to a file.
You can use either the DriveFile. You can optionally use a OpenFileCallback to listen to the download status if the latest version of the file is not already synced to the device. Your application must handle the opening call to verify that the DriveContents resource is successfully opened. Once the contents are open, you can make modifications to them.
The DriveContents resource provides a java. OutputStream that lets you write or append binary data to the file contents. The example below illustrates how to append "Hello world" to a DriveContents object.Androidpdfviewer. March 3, at pm. Like Like. November 19, at am. April 24, at pm.
Hii copy pasted same exact code and getting error that unfortunately xxxx app stopped working and page never loads and theer no error in gradel build or installing apkplz help. April 25, at am. July 18, at pm. Very useful! Do you know if it is possible to create a searchView that will search for words within a PDF displayed through pdfView? September 16, at pm. I also get an error with the line pdfView. It shows the following error…. Caused by: java. September 23, at pm.
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Convert Image to pdf in android programatically
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Blog at WordPress. Search for:. Deepshikha Puri Android Developer. Menu Skip to content Contact. Activity; import android. Cursor; import android.A common requirement for Android apps is to manipulate files — saving pictures, downloading documents, or exporting data to share with other programs. Android which is based on Linux supports this by providing space for file storage.
Android groups the filesystem into two different types of storage:. These groupings are conceptual only, and don't necessarily refer to a single partition or directory on the device. An Android device will always provide partition for internal storage and external storage. It is possible that certain devices may have multiple partitions that are considered to be external storage.
Regardless of the partition the APIs for reading, writing, or creating files is the same. There are two sets of APIs that a Xamarin. Android application may use for file access:. Reading and writing to files is almost identical in Xamarin. Android as it is to any other. NET application. The Xamarin. Android app determines the path to the file that will be manipulated, then uses standard. NET idioms for file access. Because the actual paths to internal and external storage may vary from device to device or from Android version to Android version, it is not recommended to hard code the path to the files.
Instead, use the Xamarin. Android APIs to determine the path to files. That way, the. Before discussing the APIs involved with file access, it is important to understand some of the details surrounding internal and external storage.
This will be discussed in the next section.In getfile method is created to get the list of pdf files save in android phone. Download source code from here. Manifest; import android. ProgressDialog; import android. Intent; import android. PackageManager; import android. Environment; import android. ActivityCompat; import android.
ContextCompat; import android. AppCompatActivity; import android. Bundle; import android. Log; import android. View; import android. AdapterView; import android. ListView; import android. File; import java. ArrayList; import java. HashMap; import java. Context; import android. Typeface; import android.
LayoutInflater; import android. ViewGroup; import android. ArrayAdapter; import android. ImageView; import android. Nullable; import android. PDFView; import com. OnLoadCompleteListener; import com. OnPageChangeListener; import com. DefaultScrollHandle; import com.The end result of either approach is the same. However, for instances where the user is specifying the location or title of the file, DriveClient. To create files programmatically or allow users to specify other metadata in a custom UI activity, you must use the createFile method.
When you create a file through either method, you can specify the initial set of metadatafile contents, and the parent folder.
In the case of using DriveClient. The DriveClient. You can also use this class to specify the initial metadata and contents for the file.
The class creates an intent that you can use to start the create file activity containing the UI. The following example demonstrates how to use the activity builder to create a text file:. To create multiple files programmatically, or if you prefer to use your own UI to let users specify additional metadata, you must use the DriveResourceClient.
When you call DriveResourceClient.
The following example demonstrates creating a new text file in the user's root folder:. You may sometimes need to create empty files, for example, a user preference file that is empty until the user defines some application property or a plain text file that is empty until some content is written to it later on.
If you are using the DriveClient. If you are creating empty files programmatically, pass null in place of DriveContents to the createFile method:.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to create a program, that open documents without external app.
I need this, because i want to scroll the document with the phones orientation Pitch and Roll. I create a button on the bottom of the screen, and when i hold down the button, i can scroll the document too. If i release the button, i can't scroll it. So, if i open the document with external app, my button disappears, and the sensorManager works neither.
Have someone any idea to solve this problem. Or have someone any idea, how to scroll the document, opened in an external app, with my phones orientation? I think you should use custom library for getting that done. See this and this. In this approach the drawback is you need internet connectivity. But i think it satisfy your need.
Download the source code from here Display PDF file inside my android application. Above answers that are dependent on google docs will work only when you have internet connection. A better option would be to use Android PdfRenderer class. You can try sample app here. Learn more.
Ask Question. Asked 7 years, 2 months ago. Active 1 year, 4 months ago. Viewed 87k times. KhalDrogo KhalDrogo 1 1 gold badge 3 3 silver badges 8 8 bronze badges. Did you find the solution?
I am also facing this issue. I couldn't load the docs in webview. Same issue the provided solution works well for pdf files but not for. Active Oldest Votes. Both works for me. I would never think on it.Opening and viewing documents in Android applications are very interesting and a must to have in every application.
You can open any application present on your mobile and you will find that every application contains documents in some or the other way. And among these documents, the most popular and widely used document format is the PDF format. PDF or Portable Document Format is a file format that has captured all the elements of a printed document.
This is the most used document format. For example, in the Paytm application, you get your monthly expenses in the form of PDF document. So, if you also want to display some kind of document in your application, then you can open this PDF format document.
We will cover the below topics in this tutorial:. In this tutorial, we will make a project and try various ways of opening PDF file, Here we are going to set up our project:.
If you want to display PDF in your Android application, there are various ways of doing it. Some of the ways of opening the PDF can be:. So, for the first point, we will use WebViewActivity and for 2nd, 3rd, and 4th point, we will be using PdfViewActivtiy.
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Now, for the above four actions, create four buttons and assign the task to open activity by those four buttons. In the MainActivity. Add below method in FileUtils class:. Following is the code of WebViewActivity.
So, add the below line in your AndroidManifest. Now, run the application on your mobile phone and the PDF will be displayed on the screen. There are various libraries that can be used to display PDF files in our application. Open the app level build.
Open the AndoidManifest. So, we need to write the code to connect the button click of MainActivity with the above events. Create a function named checkPdfAction and write the below code:.
Call the above method from the onCreate :. Create getPdfNameFromAssets method. This method will return the name of the PDF file present in the assets folder:. Now, in the PdfViewActivity. So, we have to launch an intent to find the file having PDF format and the selected file will be displayed in the PDFView by calling the fromUri method.