Read the entire post for further clarification and explanations.How to create an android image viewer - Part 2 Action open document intent
This is our first application, in which we require two activities. We will use the intent function to go from one activity to another. All we need in our first activity is a button, which, when pressed, will take us to the next activity.
By default, we have the ConstraintLayout set. You can find the code to the interface of the activity at the bottom of the article. Next, we need to create the activity the screen where the button will take us. We can do this in many ways.
Open files using storage access framework
The easiest one goes like this. You do this by opening the AndroidManifest. Now your application recognizes the second activity. The second activity will be completely empty, so we have to add a new text element to show us we are in the second activity, and a button below it to take us back to the previous activity.
You can find the complete code to the interface of this activity at the bottom of this post. You will see that this is by far one of the easiest things to code. We use two lines of code, each time we want to use the intent. The first one is the location where we are right now. This is pretty much the same as the code in the first activity.
With just the source and destination activities reversed. Your email address will not be published.
How to start a new activity using Intent in Android Studio – Full Code Tutorial and Explanation
The file is being downloaded by a webservice and should be stored on local fs. Instead of the picture the galery shows a black screen with not content in there except the action bar. BTW: The data that has been stored on the local fs is valid not corruptI downloaded the files from debugger via pull method and the files can be opened on my workstation You cannot open files that are not on the sdcard like that.
You'll need to copy the file to the sdcard and then opening it. When setting the location to " openFileOutput "fileName", Activity. Other apps cannot read the data even for viewing stored when setting to " Context. Learn more. How to open a file in Android via an Intent Ask Question. Asked 7 years, 6 months ago. Active 10 months ago. Viewed 33k times.
Toon Krijthe Active Oldest Votes. What is the type of the Attachment in your code? Perhaps it returns wrong mime type? No, this won't work I was calling Uri. Givi Givi 3, 3 3 gold badges 16 16 silver badges 22 22 bronze badges.
Can you give me a link where this is confirmed by google in sdk documentation. I didn't find anything about that in the official documentation BTW: When I open the file in an own activity that can handle images it works Unfortunately I'm talking out of experience so I don't have a link. Hope it helps Sorry if not. So I have to write own Viewer-"Activities" that can handle the files that are stored on this private folder? But the files will be accessible by another application, for example a filebrowser-app after thatJust like in Windows, we have multiple software to open a particular file typewe have a number of apps in Android to take care of a single file type.
Google Play Store has a plethrora of applications to better open different media files. Be it a new app to make calls, your new web browsera swift messaging app or a swanky music player — an Android user is always on the lookout for a new app to adorn his or her home screen.
When you choose an app to be the default application to open a particular file type, it will do so whenever any third-party app is trying to access that particular file type as part of the default settings.Mantra semula jadi zakar kuda
Open Android Apps settings. Different versions of Android may also show different names of the tabs mentioned above. So, whether you are stuck with Android Marshmallow or are more upbeat Android Nougatthese instructions may vary. Now search for the app you want to change the default settings for and tap on the app settings to open the info page of that application. Scroll down the page to find the button Clear defaults. If the app is a default app for any of the file type on your device, the button will be enabled, otherwise disabled.
Simply tap on the button to clear all the files associated with the app. Next time you try to open the same file type, you will get all the suggestions to choose from again. Just make sure you make the right decision this time.Android 4. The SAF makes it simple for users to browse and open documents, images, and other files across all of their preferred document storage providers. A standard, easy-to-use UI lets users browse files and access recents in a consistent way across apps and providers.
Cloud or local storage services can participate in this ecosystem by implementing a DocumentsProvider that encapsulates their services. Client apps that need access to a provider's documents can integrate with the SAF with just a few lines of code. Within a document provider, data is structured as a traditional file hierarchy:. Figure 1. Document provider data model.
A Root points to a single Document, which then starts the fan-out of the entire tree. As stated above, the document provider data model is based on a traditional file hierarchy. However, you can physically store your data however you like, as long as you can access it by using DocumentsProvider API.
For example, you could use tag-based cloud storage for your data. Figure 3 shows a picker in which a user searching for images has selected the Downloads folder. It also shows all of the roots available to the client app. After the user selects the Downloads folder, the images are displayed. Figure 4 shows the result of this process. The user can now interact with these images in the ways that the provider and client app support.
Figure 4. Images stored in the Downloads folder, as viewed in the system picker. On Android 4. The user must then select a single app from which to pick a file and the selected app must provide a user interface for the user to browse and pick from the available files. From this single UI, the user can pick a file from any of the supported apps. On Android 5. The one you should use depends on the needs of your app:. For more information on how to support browsing for files and directories using the system picker UI, see the guide on how to access documents and other files.
Content and code samples on this page are subject to the licenses described in the Content License.An intent allows you to start an activity in another app by describing a simple action you'd like to perform such as "view a map" or "take a picture" in an Intent object.
This type of intent is called an implicit intent because it does not specify the app component to start, but instead specifies an action and provides some data with which to perform the action.How to wire a dual 4 ohm sub to 4 ohms
When you call startActivity or startActivityForResult and pass it an implicit intent, the system resolves the intent to an app that can handle the intent and starts its corresponding Activity.
If there's more than one app that can handle the intent, the system presents the user with a dialog to pick which app to use. This page describes several implicit intents that you can use to perform common actions, organized by the type of app that handles the intent. Each section also shows how you can create an intent filter to advertise your app's ability to perform the same action. Caution: If there are no apps on the device that can receive the implicit intent, your app will crash when it calls startActivity.
To first verify that an app exists to receive the intent, call resolveActivity on your Intent object. If the result is non-null, there is at least one app that can handle the intent and it's safe to call startActivity. If the result is null, you should not use the intent and, if possible, you should disable the feature that invokes the intent. If you're not familiar with how to create intents or intent filters, you should first read Intents and Intent Filters.
To learn how to fire the intents listed on this page from your development host, see Verify Intents with the Android Debug Bridge. Google Voice Actions fires some of the intents listed on this page in response to voice commands. For more information, see Intents fired by Google Voice Actions.
Note: Only the hour, minutes, and message extras are available in Android 2. The other extras were added in later versions of the platform.Animal drama lessons
For a one-time alarm, do not specify this extra. To use the default ringtone, do not specify this extra. If true, the app should bypass any confirmation UI and simply set the specified alarm. Example intent:. Although not many apps will invoke this intent it's primarily used by system appsany app that behaves as an alarm clock should implement this intent filter and respond by showing the list of current alarms. You can then specify various event details using extras defined below.
Many more event details can be specified using the constants defined in the CalendarContract. EventsColumns class. For more information about how to use this intent to capture a photo, including how to create an appropriate Uri for the output location, read Taking Photos Simply or Taking Videos Simply. The result Intent delivered to your onActivityResult callback contains the content: URI pointing to the selected contact. Tip: If you need access to only a specific piece of contact information, such as a phone number or email address, instead see the next section about how to select specific contact data.
For information about how to retrieve contact details once you have the contact URI, read Retrieving Details for a Contact.
CommonDataKinds classes is more efficient than using the Contacts. The result Intent delivered to your onActivityResult callback contains the content: URI pointing to the selected contact data.
How to start a new activity using Intent in Android Studio – Full Code Tutorial and Explanation
For more information about how to edit a contact, read Modifying Contacts Using Intents. For more information about how to insert a contact, read Modifying Contacts Using Intents. To compose an email, use one of the below actions based on whether you'll include attachments, and include email details such as the recipient and subject using the extra keys listed below.
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My app has a feature that browse files on your phone and SD card and open them using other apps. I want a solution where I don't have to specify the MimeType and can work with any type of file. Android does not start activities based on file extensions, unless there's an app that specifies a particular intent filter for it. You will need the mime type to the Intent to tell android enough information to start the right Activity.
You have the option to automate this task by using the MimeTypeMap class. You should also handle this exception, probably by showing a nice popup saying that there is no app for that particular type of file. Where getMimeType is There is a problem with NoBugs's answer.
This is directly out of the eclipse function information window:. Learn more. Asked 8 years, 10 months ago. Active 10 months ago. Viewed 70k times. Idolon Active Oldest Votes.Hawes western marshall serial numbers
NoBugs NoBugs 7, 9 9 gold badges 61 61 silver badges bronze badges. How about URLConnection. There is a problem with this code: in third line of code you shouldn't use substring 1. BadSkillz BadSkillz 1, 18 18 silver badges 36 36 bronze badges. Ameen Maheen Ameen Maheen 2, 1 1 gold badge 21 21 silver badges 26 26 bronze badges. Nice job! But How about endsWith instead of contains method? Thomas Vos's point is crucial. This code is useful but if you're going to use it then you need to set your targetSdkVersion to 23 or under.
If an Android 7. BTW, do you have a pdf reader installed in your device? Aleadam Aleadam You can find out the mime type of a file and make your own intent to open the file. Use the following code to open any file Tamal Samui Tamal Samui 7 7 silver badges 12 12 bronze badges. This will work surely. This is directly out of the eclipse function information window: String android.
Parameters extension A file extension without the leading '.An Intent is a messaging object you can use to request an action from another app component. Although intents facilitate communication between components in several ways, there are three fundamental use cases:.
An Activity represents a single screen in an app. You can start a new instance of an Activity by passing an Intent to startActivity. The Intent describes the activity to start and carries any necessary data.
If you want to receive a result from the activity when it finishes, call startActivityForResult. Your activity receives the result as a separate Intent object in your activity's onActivityResult callback. For more information, see the Activities guide. A Service is a component that performs operations in the background without a user interface.
With Android 5. For versions earlier than Android 5. You can start a service to perform a one-time operation such as downloading a file by passing an Intent to startService. The Intent describes the service to start and carries any necessary data. If the service is designed with a client-server interface, you can bind to the service from another component by passing an Intent to bindService.
For more information, see the Services guide. A broadcast is a message that any app can receive. The system delivers various broadcasts for system events, such as when the system boots up or the device starts charging. You can deliver a broadcast to other apps by passing an Intent to sendBroadcast or sendOrderedBroadcast.
The rest of this page explains how intents work and how to use them. Figure 1 shows how an intent is used when starting an activity. When the Intent object names a specific activity component explicitly, the system immediately starts that component. Figure 1. How an implicit intent is delivered through the system to start another activity:  Activity A creates an Intent with an action description and passes it to startActivity.
When a match is found,  the system starts the matching activity Activity B by invoking its onCreate method and passing it the Intent. When you use an implicit intent, the Android system finds the appropriate component to start by comparing the contents of the intent to the intent filters declared in the manifest file of other apps on the device. If the intent matches an intent filter, the system starts that component and delivers it the Intent object.
If multiple intent filters are compatible, the system displays a dialog so the user can pick which app to use. An intent filter is an expression in an app's manifest file that specifies the type of intents that the component would like to receive. For instance, by declaring an intent filter for an activity, you make it possible for other apps to directly start your activity with a certain kind of intent.
Likewise, if you do not declare any intent filters for an activity, then it can be started only with an explicit intent. Caution: To ensure that your app is secure, always use an explicit intent when starting a Service and do not declare intent filters for your services. Using an implicit intent to start a service is a security hazard because you can't be certain what service will respond to the intent, and the user can't see which service starts.
Beginning with Android 5. An Intent object carries information that the Android system uses to determine which component to start such as the exact component name or component category that should receive the intentplus information that the recipient component uses in order to properly perform the action such as the action to take and the data to act upon. The primary information contained in an Intent is the following:.
This is optional, but it's the critical piece of information that makes an intent explicitmeaning that the intent should be delivered only to the app component defined by the component name. Without a component name, the intent is implicit and the system decides which component should receive the intent based on the other intent information such as the action, data, and category—described below.
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