Develop Reference

android open pdf from internal storage

I have a pdf in the app's internal storage, however, I cannot open the file in the system pdf app.
val pdfDirPath = File(context.filesDir, "pdfs")
val file: File = File(pdfDirPath, "title.pdf")
val uri = Uri.fromFile(file)
val intent = Intent(Intent.ACTION_VIEW)
intent.setDataAndType(uri, "application/pdf");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
it shows the error "cannot display pdf"

Try this
Uri pdfUri = FileProvider.getUriForFile(getContext(), getContext().getApplicationContext().getPackageName() + ".provider", file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(pdfUri, "application/pdf");
intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)

When I open .doc file giving me error like could not open this document this file isn't available offline

Uri uri = Uri.fromFile(file); Intent intent = new
Intent(Intent.ACTION_VIEW);
if (file.toString().contains(".doc") ||
file.toString().contains(".docx")) {
intent.setDataAndType(uri, "application/msword");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
activity.startActivity(intent); }

Update App via APK download (with url), not showing Open/Done Screen

I am trying to add option to update app by downloading apk, its getting installed successfully. But the problem is, app got close after installation, without prompting Open/Done screen in Nougat and above devices.
I have tried using both ACTION_VIEW and ACTION_INSTALL_PACKAGE, but no luck. Also tried with startActivityForResult instead of startActivity, still no luck.
public void installAPK() {
Intent intent = new Intent(Intent.ACTION_INSTALL_PACKAGE);
File file = new File(path + "update.apk");
if (Build.VERSION.SDK_INT < 24) {
intent.setDataAndType(Uri.fromFile(new File(path + "update.apk")), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // without this flag android returned a intent error!
} else {
Uri apkURI = FileProvider.getUriForFile(
activity,
activity.getApplicationContext()
.getPackageName() + ".provider", file);
intent.setDataAndType(apkURI, "application/vnd.android.package-archive");
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
}
intent.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true);
activity.startActivityForResult(intent, RC_INSTALL_APK);
}
Anything I missed to do?

Here's sample code of my application method to open new version
void OpenNewVersion(String location) {
Intent downloadIntent;
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
String PATH = Environment.getExternalStorageDirectory() + "/Download/";
File fileLocation = new File(PATH, "app-stock.apk");
Uri apkUri = FileProvider.getUriForFile(this, "Adapters.GenericFileProvider", fileLocation);
downloadIntent = new Intent(Intent.ACTION_VIEW);
downloadIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
downloadIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
downloadIntent.setDataAndType(apkUri, "application/vnd.android.package-archive");
List<ResolveInfo> resInfoList = this.getPackageManager().queryIntentActivities(downloadIntent, PackageManager.MATCH_DEFAULT_ONLY);
for (ResolveInfo resolveInfo : resInfoList) {
String packageName = resolveInfo.activityInfo.packageName;
this.grantUriPermission(packageName, apkUri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
}
} else {
File fileLocation = new File(this.getFilesDir(), "app-stock.apk");
downloadIntent = new Intent(Intent.ACTION_VIEW);
downloadIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
downloadIntent.setDataAndType(Uri.fromFile(fileLocation), "application/vnd.android.package-archive");
}
this.startActivity(downloadIntent);
}

How can I open a PDF file using Intent in Android Nougat?

I appreciate your help so that my code can open a PDF file with an Intent, this is the code i have been using:
String pathFile =
Environment.getExternalStorageDirectory().toString() +
FileUtils.PATH_SEPARATOR + "myFolder" +
FileUtils.PATH_SEPARATOR + "myFile.pdf";
File pdfFile = new File( pathFile );
if ( pdfFile.exists() ) {
Uri uri = Uri.fromFile( new File( pathFile ) );
Intent intent = new Intent( Intent.ACTION_VIEW );
intent.setDataAndType(uri, "application/pdf");
intent.addFlags( Intent.FLAG_ACTIVITY_NEW_TASK );
startActivity( intent );
}
But I understand that now (from the Android-N version) the privileges are handled differently and so i hope you can help me by indicating what changes i have to make to get a PDF file opened using an Intent.
PS: In my AndroidManifest.xml I am looking for all permissions in the STORAGE:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

The answer was found at: http://android.2317887.n4.nabble.com/FileProvider-td394588.html
Terrific!.

Try this code.
Intent intent = new Intent(Intent.ACTION_VIEW);
try {
String newFilePath = filePath.replaceAll("%20", " ");
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
intent.setDataAndType(Uri.parse(newFilePath), "application/pdf");
} else {
Uri uri = Uri.parse(newFilePath);
File file = new File(uri.getPath());
if (file.exists()){
uri = FileProvider.getUriForFile(context, context.getPackageName() + ".provider", file);
intent.setDataAndType(uri, "application/pdf");
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
}
}
intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(intent);

open directory (folder) in android

What is the code to open the folder, /storge/sdcar0/0students/ to be like a screen in the picture below
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()
+ "/0students/");
intent.setDataAndType(uri, "*/*");
startActivity(Intent.createChooser(intent, "Open folder"));
I have used this code, but is not required
enter link description here

To open the directory 0students, try this.
Uri uri = Uri.parse(Environment.getExternalStorageDirectory() + "/0students/");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "resource/folder");
if (intent.resolveActivity(getPackageManager()) != null){
startActivity(intent);
}