I have used he Download Manager Class to download a text file from the server and stored it in the common external storage. Then I want to show the text file, may be using the listView class. I have searched the web and found that there are many examples showing how to display a text file from the App's resources. However, how can I show the file which is stored in a specific file path?
Thank you very much.
In your layout you'll need something to display the text. A TextView is the obvious choice. So you'll have something like this:
<TextView
android:id="#+id/text_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
And your code will look like this:
//Find the directory for the SD Card using the API
//*Don't* hardcode "/sdcard"
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
File file = new File(sdcard,"file.txt");
//Read text from file
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append('\n');
}
br.close();
}
catch (IOException e) {
//You'll need to add proper error handling here
}
//Find the view by its id
TextView tv = (TextView)findViewById(R.id.text_view);
//Set the text
tv.setText(text);
Also, put external storage read permission to manifest file:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
OR
You can also use default intent to do the JOB!
File txtfile = new File("/sdcard/some_file.txt");
Intent i = new Intent();
i.setDataAndType(Uri.fromFile(txtfile), "text/plain");
startActivity(i);
--
Try below code.
private void openFile() {
File file = new File("file_path");
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setAction(Intent.ACTION_VIEW);
intent.setData(path);
intent.setType("text/plain");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(getActivity(), "No application found",
Toast.LENGTH_SHORT).show();
}
}
You can open file from sd card by using code given below in external application which compatible to file extension,
public void openDocument(String fileName) {
File file = new File(Environment.getExternalStorageDirectory(), DATA_DIRECTORY + "/" + fileName);
Uri fileUri = Uri.fromFile(file);
Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
String extension = MimeTypeMap.getFileExtensionFromUrl(fileUri.toString());
String mimetype = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
if (extension.equalsIgnoreCase("") || mimetype == null) {
// if there is no extension or there is no definite mimetype, still try to open the file
intent.setDataAndType(fileUri, "application/*");
} else {
intent.setDataAndType(fileUri, mimetype);
}
// custom message for the intent
startActivity(Intent.createChooser(intent, "Choose an Application:"));
}
Related
i'm getting a pdf file from an api, and i got something like that http://x/docs/document1
In my android project, i have like this:
try{
Android.Content.Intent activity = new Android.Content.Intent(this, typeof(WebViewPDF));
activity.AddFlags(Android.Content.ActivityFlags.GrantReadUriPermission);
activity.AddFlags(Android.Content.ActivityFlags.NoHistory);
string uriAndroid = "http://x/docs/document1";
activity.PutExtra("url", JsonConvert.SerializeObject(uriAndroid));
StartActivity(activity);
}catch (Exception){
...
}
The main problem is, i cannot modify the api, so the endpoint is http://x/docs/document1, but if i try another uri, with the .pdf extension, for example https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf it works fine.
I don't know if i need to get that info from the API in a different way,
How can i show the pdf in the webView or external app without download first the doc?
The solution was download first and then open from local.
void PrintPdf(Uri uri)
{
var webClient = new WebClient();
webClient.Proxy = WebRequest.DefaultWebProxy;
webClient.Credentials = new NetworkCredential("UserName", "Pass");
webClient.Encoding = Encoding.UTF8;
var bytes = webClient.DownloadData(uri);
var text = bytes; // get the downloaded text
string localFilename = "NameforPdf.PDF";
string localPath = System.IO.Path.Combine(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads).ToString(), localFilename);
File.WriteAllBytes(localPath, text); // writes to local storage
bool exists = File.Exists(localPath);
if (exists)
{
Java.IO.File file = new Java.IO.File(localPath);
file.SetReadable(true);
//That's the important part, notice the content://
Android.Net.Uri uriLocal = Android.Net.Uri.Parse("content://" + localPath);
Intent intent = new Intent(Intent.ActionView);
intent.SetFlags(ActivityFlags.NewTask);
intent.SetDataAndType(uriLocal, "application/pdf");
intent.AddFlags(ActivityFlags.GrantReadUriPermission);
try
{
StartActivity(intent);
}
catch (Exception)
{
Toast.MakeText(Xamarin.Forms.Forms.Context, "pdf reader not installed", ToastLength.Short).Show();
}
}
}
I've coded my own file explorer and now I want to start to Implement capabilities to open various files. I have implemented Mime Types and all other things but how can I parse specific selected file to specific "viewer activity"? I know by using intents but how to receive it in that viewer app and use it. Many thanks guys :)
Something like this should work. Change file to whatever you want.
File file = new File(Environment.getExternalStorageDirectory(), "movie.mp4");
int index = file.getName().lastIndexOf(".") + 1;
String extension = null;
if (index > 0) {
extension = file.getName().substring(index);
}
Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
Uri u = Uri.parse("file://" + file.getAbsolutePath());
String mimeType = null;
if (extension != null) {
mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
}
if (mimeType == null) {
mimeType = "*/*";
}
intent.setDataAndType(u, mimeType);
try {
startActivity(Intent.createChooser(intent, "Open with..."));
} catch (ActivityNotFoundException e) {
// handle the exception
}
I have some text files on my android's SD Card, and i need to access one of them.
I came across the below code here:
//Find the directory for the SD Card using the API
//*Don't* hardcode "/sdcard"
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
File file = new File(sdcard,"file.txt");
//Read text from file
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append('\n');
}
}
catch (IOException e) {
//You'll need to add proper error handling here
}
//Find the view by its id
TextView tv = (TextView)findViewById(R.id.text_view);
//Set the text
tv.setText(text);
But in this part of the code:
//Get the text file
File file = new File(sdcard,"file.txt");
the name of the text file is specified but i need the user to choose the text file he wants (from those text files in SD Card). So how can i let the user brows the SD Card and choose
the file he wants?
You need a file chooser/browser to be created here. There are lots of libraries available using which you can achieve the required functionality. Here is one -
https://code.google.com/p/android-file-chooser/
Also, necessary code is required on first page. Like to invoke the file chooser, you will need to write these lines of code -
Intent intent = new Intent(this, FileChooser.class);
ArrayList<String> extensions = new ArrayList<String>();
extensions.add(".txt"); //can be used for multiple filters
intent.putStringArrayListExtra("filterFileExtension", extensions);
startActivityForResult(intent, FILE_CHOOSER);
And, for callback to get path of Selected File by User -
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if ((requestCode == FILE_CHOOSER) && (resultCode == -1)) {
String fileSelected = data.getStringExtra("fileSelected");
Toast.makeText(this, fileSelected, Toast.LENGTH_SHORT).show();
}
}
I am Working email attachment .I am facing one problem while attachment .Problem Is that i want to sent a mail with attachment .I have one file on this path sdcard0 then fgg then hh.html.When I debug
on this File file = new File(attachments.getString(i));
it show file:/storage/sdcard0/fgg/hh.html
But After this it not go to if condition why ?
File file = new File(attachments.getString(i));
if (file.exists()) {
Uri uri = Uri.fromFile(file);
uris.add(uri);
}
Here is my hole code
JSONArray attachments = parameters.getJSONArray("attachments");
if (attachments != null && attachments.length() > 0) {
ArrayList<Uri> uris = new ArrayList<Uri>();
//convert from paths to Android friendly Parcelable Uri's
for (int i=0; i<attachments.length(); i++) {
try {
File file = new File(attachments.getString(i));
if (file.exists()) {
Uri uri = Uri.fromFile(file);
uris.add(uri);
}
} catch (Exception e) {
LOG.e("EmailComposer", "Error adding an attachment: " + e.toString());
}
}
if (uris.size() > 0) {
emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
}
}
} catch (Exception e) {
LOG.e("EmailComposer", "Error handling attachments param: " + e.toString());
}
Uri to file will need triple slashes :
file:///storage/sdcard0/fgg/hh.html
As you can see here.
But i twill probably not work, so try to remove the "file:" part of your string :
File file = new File(attachments.getString(i).replace("file:","");
in a URI, you have different parts.
First the scheme:
http://
file://
ftp://
Then the path you want to access:
myfile.txt
videos/myvideo.avi
/storage/sdcard0/fgg/hh.html
So your complete URI should be:
file:///storage/sdcard0/fgg/hh.html
More information here:
http://developer.android.com/reference/java/net/URI.html
You can then build your File and check if it exist with this snippet
Uri.Builder builder = new Uri.Builder();
builder.scheme("file");
builder.path(myFilePath);
Uri uri = builder.build();
File file = new File(uri.getPath());
if (file.exists()) {
uris.add(uri);
// do whatever you want
}
EDIT:
If your JSON send you complete URI path, use this code instead:
Uri uri = Uri.parse(attachments.getString(i));
File file = new File(uri.getPath());
if (file.exists()) {
uris.add(uri);
// do whatever you want
}
Try two forward slashes after :
file://storage/sdcard0/fgg/hh.html
edit:
should be 3 forward slashes
I have an ImageView with a share intent( which works great, brings up all the apps I can share the image with), however, I can not share the photo because it has no path on my phone. How do I go about saving the ImageView on my phone? Below is my code.
public void taptoshare(View v)
{
View content = findViewById(R.id.myimage);
content.setDrawingCacheEnabled(true);
Bitmap bitmap = content.getDrawingCache();
File file = new File("/DCIM/Camera/image.jpg");
try
{
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
bitmap.compress(CompressFormat.JPEG, 100, ostream);
ostream.close();
}
catch (Exception e)
{
e.printStackTrace();
}
Intent shareIntent = new Intent(Intent.ACTION_SEND);
Uri phototUri = Uri.parse("/DCIM/Camera/image.jpg");
shareIntent.setData(phototUri);
shareIntent.setType("image/*");
shareIntent.putExtra(Intent.EXTRA_STREAM, phototUri);
startActivity(Intent.createChooser(shareIntent, "Share Via"));
}
}
UPDATE
Ok, so I figured it out. Now I have a new question, how would I go about saving this image to a new folder?
When saving and loading, you need to get the root path of the system, first. This is how I'd do it.
File root = Environment.getExternalStorageDirectory();
File cachePath = new File(root.getAbsolutePath() + "/DCIM/Camera/image.jpg");
I've come across a couple solutions which are not solving this problem.
Here is a solution that worked for me. One gotcha is you need to store the images in a shared or non app private location (http://developer.android.com/guide/topics/data/data-storage.html#InternalCache)
Many suggestions say to store in the Apps "private" cache location but this of course is not accessable via other external applications, including the generic Share File intent which is being utilised. When you try this, it will run but for example dropbox will tell you the file is no longer available.
/* STEP 1 - Save bitmap file locally using file save function below. */
localAbsoluteFilePath = saveImageLocally(bitmapImage);
/* STEP 2 - Share the non private Absolute file path to the share file intent */
if (localAbsoluteFilePath!=null && localAbsoluteFilePath!="") {
Intent shareIntent = new Intent(Intent.ACTION_SEND);
Uri phototUri = Uri.parse(localAbsoluteFilePath);
File file = new File(phototUri.getPath());
Log.d("file path: " +file.getPath(), TAG);
if(file.exists()) {
// file create success
} else {
// file create fail
}
shareIntent.setData(phototUri);
shareIntent.setType("image/png");
shareIntent.putExtra(Intent.EXTRA_STREAM, phototUri);
activity.startActivityForResult(Intent.createChooser(shareIntent, "Share Via"), Navigator.REQUEST_SHARE_ACTION);
}
/* SAVE IMAGE FUNCTION */
private String saveImageLocally(Bitmap _bitmap) {
File outputDir = Utils.getAlbumStorageDir(Environment.DIRECTORY_DOWNLOADS);
File outputFile = null;
try {
outputFile = File.createTempFile("tmp", ".png", outputDir);
} catch (IOException e1) {
// handle exception
}
try {
FileOutputStream out = new FileOutputStream(outputFile);
_bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
} catch (Exception e) {
// handle exception
}
return outputFile.getAbsolutePath();
}
/* STEP 3 - Handle Share File Intent result. Need to remote temporary file etc. */
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// deal with this with whatever constant you use. i have a navigator object to handle my navigation so it also holds all mys constants for intents
if (requestCode== Navigator.REQUEST_SHARE_ACTION) {
// delete temp file
File file = new File (localAbsoluteFilePath);
file.delete();
Toaster toast = new Toaster(activity);
toast.popBurntToast("Successfully shared");
}
}
/* UTILS */
public class Utils {
//...
public static File getAlbumStorageDir(String albumName) {
// Get the directory for the user's public pictures directory.
File file =
new File(Environment.getExternalStorageDirectory(), albumName);
if (!file.mkdirs()) {
Log.e(TAG, "Directory not created");
}
return file;
}
//...
}
I hope that helps someone.