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Extracting embedded text is a common feature, but other applications perform optical character recognition OCR to convert imaged text to machine-readable form, sometimes by using an external OCR module. Cannot edit PDF Files. From Wikipedia, the free encyclopedia. See also: Comparison of e-book readers. Retrieved 26 October Retrieved 13 December List of PDF software. Categories : Lists of software Office document file formats.
Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. ImageMagick License [1]. Converts PDF to raster images and vice versa. Apache License 2. Converts PostScript to other vector graphics file format. Public Domain.
Supports merging, splitting, and extracting pages from PDFs. Also rotating, deleting and reordering pages. Export documents only one page at a time pages can be later combined using PDF printer. Due to the strong connection of Wi-Fi it would need, it is recommended to use the wired connection instead.
To adjust it you need to follow these steps once you already enabled the developer options:. You need a third-party application to enable the wireless connection from your Android device to your PC.
Each application offers specific features, just keep in mind that the one you choose must be safe since both of your devices could be vulnerable to malware attacks during the mirror connection. Vysor is an app that enables the screen mirroring from Android to PC.
You can use this App and start mirroring via USB. ApowerMirror is a versatile application that you can download on your Android device to enable the compatibility with different devices. It is a safe alternative for wireless connection. Mobzapp is an application that wants to facilitate all your Android phone features to be used from your PC with wireless connection. Google Home is the official Google application for casting and mirroring phone screens. It can be installed and used for free.
This is due to the issues that using a wireless connection represents. The first main issue is that wireless connection does not enable all the interactions with your phone, forcing you to use a keyboard to control your phone.
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From now on, you can open, read PDF files professionally in your phones and tablets. Let’s get the pdf viewer for android free download application now for FREE! If you love the app, please rate and take a moment to send us a comments for us via email: crismorgan gmail. Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties Learn more about how developers declare sharing. No data collected Learn more about how developers declare collection. These include smartphones, tablets, Smart Wears, smart TV’s, and even cars. From just a mobile computing platform, Google has used the powers of Android to a great and deeper extent. Looking at the Android distribution, Android 4.
Comparing smartphone OS global market shares from Q to Q, Android has grown massively from 1. At this pace, we can expect M users by In this chapter, we will look at the Android Support Library features and how they assist us in the project. The Android Support Library Supporting multiple devices can pose issues, particularly when users expect apps to function seamlessly on every device, in the same way. This expectation rises even when users know very well that there is a significant difference in the software and hardware of the phone.
While Google releases, latest updates to Android, it is not necessarily true that all OEMs follow up on this update on their smartphone. This leads to the fact that most of the users tend to use releases which are approximately 15 months old or older.
Leap into the Android Support Library If that is held true, developers would have to compromise a lot in order to support most of their users, running several versions of Android. Fortunately, the Android team is aware of this and endeavors to provide consistent help for the developer in this regard. This is a tricky issue, especially considering the consistency of the app feature that shouldn’t affect the architectural structure. The Android Support Library is a collection of libraries, which are available on several API levels, that help developers to focus on the unique parts of their app, supporting new functionality and compatibility issues that might arise due to different versions running on different devices.
Setting up Android Support Libraries in your development environment depends entirely on what features you want to use and what range of Android platform versions you are targeting with your application. Please follow the steps given as follows to set up the Support Library files: 1. If you have opened the standalone SDK Manager, this option would be in the Extras section, as shown in the following image: 2.
Here is the list of supported libraries: Support Library Description Gradle Dependency v4 compat library Provides compatibility wrappers for a com. We will be using these primarily in our app. Here is the list of supported libraries: Support Library Description Gradle Dependency v7 appcompat library This will be one library that com.
This library supports the Action Bar Design pattern. Moreover, it also includes support for material design user interface implementations. This library depends on the v4 Support Library. This allows us to show up information in the form of cards, which can be supported on any device. Using this library adds support for the GridLayout class, which allows you to arrange UI elements using a grid styling.
In short, it supports streaming and routing of media channels from one device to external devices. This is mainly used in music applications. This library provides support for building apps that support multiple dex files. Apps that have references to more than methods would be required to use multidex configuration. The gradle dependency identifier for this library is as follows: com.
It has v8 renderscript library – which adds support for the RenderScript computation framework. It supports the FragmentCompat class and additional fragment support classes. We followed this by discussing several libraries that can help developers to use libraries which can offer backward-compatible versions of new features.
With automatic platform updates distributed as an APK on the Google Play Store, developers can easily receive the updates and more easily integrate Google features. This interface also allows you to obtain authorization from users to gain access to these services using the users’ credentials. These services include Google Drive, Play Games and more. Since the library derives updates from Google Play, it does contain APIs that help you resolve any issues at runtime.
Sometimes you may have come across apps that prompt you to update Google Play Services before proceeding. The service performs the desired action on your behalf. Also, to include a specific dependency for your app, proceed to add specific services in your app’s build Gradle. The various services provided by Google Play Services could be included in an Android app using a Gradle path in the app’s build. The default password for the debug keystore is android. Post this, you will able to see the fingerprint displayed onto the terminal.
To make this possible, you need to register your Android app with the Google Cloud Console by providing your app’s package name and the SHA1 fingerprint of the keystore, using which you will sign the release APK. To register your Android app with Google Cloud Console, follow these simple steps: 1. Click on Create project and enter the project name. Click Create. This will create a new project in your Google Developer Console. Since we have created the project, we will now enable the APIs that are required for the project.
To enable the APIs, click on the library tab. Here you will see the list of all APIs that can be added to the app. First go to the library tab in the Google developer console.
Next go to the Credentials. Here we will be creating an OAuth credential for the app so that the user can log in from the Android app. Before we create a new credential, we have to fill in OAuth details of the app: [ 46 ] Google Play Services 4. After all of these details have been filled, go to the Credentials tab and click on Create credential: [ 47 ] Google Play Services 5.
In our case, it is an Android app, so we would select Android: 6. Then you will see an option to add the app’s package name and signingcertificate fingerprint. Here you will see an option to select an app and enter the package name. Fill in the details and click on Choose and configure services: [ 49 ] Google Play Services 9. At this screen, enable Google Sign In and enter the signing-certificate fingerprint. Then click on Generate configuration file: [ 50 ] Google Play Services You can now download the google-services.
Now, add the dependency to your project-level build. Also, add this plugin in your app-level build. Finally, add the dependency into your app-level Gradle: Compile com. We have now completed the setup for Google Play Services for this app.
In the next section we will discuss the Android Architecture we would follow, along with discussion on the UI patterns for this app. After saving the API key, use the key in your app.
Now in your app, add the dependency in your app’s build. Save the file. After adding, save the AndroidManifest. Next, we discussed Google Sign up, followed by Google Maps. Google has set design principles as guidelines to help developers work with material design for their apps. This principle sets up visual cues, motion, and interaction design across platforms and devices, making it a unified design belief.
In this section, we will cover how to incorporate material design into your app. Wireframing and tools to gather feedback Wireframing is a technique to plan out the high-level screen hierarchy for your application and display the forms that would be present in your app by providing some mode of navigation, to allow users to effectively traverse your app flow.
Some apps have wireframes expressed in a tree structure, a graph, or a flowchart. The methods of wireframing could vary based on the type and magnitude of the app, but the standard patterns of wireframing remain the same. Also, there are varieties of tools that could be used across different types of apps and different kinds of information that represent the types of things users interact with in your app.
Software engineers and data architects often use entity-relationship diagrams ERDs to describe an application’s information model. We will understand and learn the various techniques of wireframing in detail in this chapter. Material Design Understanding the wireframing process tangible and digital Before understanding the actual wireframing process, it will be nice to gather some initial information about things that would help draw some effective wireframes. Once you understand what your app will do, the first step is to list the screens present on the app step by step.
Doing this will give you a clear idea about the basic outline of the wireframing screens required. Wireframing is the step in a design process where screens are laid out creatively, by arranging the UI elements to allow users to navigate through your app. These wireframing screens need not be same as the final UI for the app. They could be somewhat rough wireframes, which would give you an idea of what elements would be present on a screen.
The easiest and fastest way to get started is to sketch out your screens by hand using paper and pencils. Once you begin sketching, you may uncover practicality issues in your original screen map or the patterns you use.
In some cases, patterns may apply well to a given design problem in theory, but in practice they may break down and cause visual clutter or interactional issues for example, if there are two rows of tabs on the screen. If that happens, explore other navigational patterns, or variations on chosen patterns, to arrive at a more optimal set of sketches. After you’re satisfied with the initial sketches, it’s a good idea to move on to digital wireframing, using software such as Adobe Illustrator, Adobe Fireworks, OmniGraffle, or any other vector illustration tools.
When choosing a tool to use, consider the following features: Material UI for Android developers Material design for Android includes implementation of visual, motion, and interactive designs for your app on different devices. Android now includes support for material design apps. To use material design in your Android apps, follow the guidelines defined in the material design specification and use the new components and functionality available in Android 5.
The Android library provides many components for giving a material experience to the user. We will explain some of the components provided in the Android library in this section. They are distinguished by a circled icon floating above the UI and have special motion behaviors related to morphing, launching, and the transferring anchor point. Floating action buttons come in two sizes: the default and mini. The size can be controlled with the FABSize attribute.
As this class descends from ImageView, you can control the icon that is displayed via setImageDrawable Drawable. The background color of this view defaults to your theme’s colorAccent. The FAB could be used to carry out different kinds of transitions on click. The following are a few images that show the different places where the FAB could be used: [ 58 ] Material Design Figure 1. Consider the restaurant details screen where we have a FAB button present, as follows; the button can be used at various different places: Figure 1.
Clicking on the button opens up the bottom menu and shows us the various options. Here, the transition from the FAB button to the bottom menu forms the major chunk of its material aspect. The following is the complete transition showing how the FAB gets converted to the bottom menu: Figure 1. Firstly, make sure that you have added the gradle dependency in your app’s build.
The next step is to import and initialize it in your Java class: import android. FloatingActionButton; If you are using Android Studio, the import will be handled automatically, and you don’t have to worry about it. The code for the on click of the FAB is mentioned below. Refer to PlaceDetailActivity. Also, we need to close the bottom menu when clicking anywhere outside.
Clicking on the search icon will produce a ripple effect, which helps a user to get a better experience: Figure 1. When this screen opens up, there is a smooth transition that takes place as each of the components appears on the screen. The search icon first opens up smoothly to form the toolbar: Figure 1. The in-between transition when the search icon opens up smoothly [ 70 ] Material Design The search icon’s in-between transition shows that the ripple wave grows gradually until it completely covers the toolbar: Figure 1.
The search icon completely opens up to form the toolbar [ 71 ] Material Design Once the search icon translates to form the toolbar, the EditText translates down from the top to the bottom and the quick search options simultaneously translate up, creating a smooth transition effect: Figure 1.
The Search icon completely opens up to form the toolbar [ 72 ] Material Design The XML layout of the search view is shown in the following code: [ 73 ] Material Design [ 74 ] Material Design The major components on this screen are the EditText, for typing the text for searching. Another important component is the RecyclerView, which displays the list of all the details. Here, we are concerned more about the way the UX for the search gives a smooth experience to a user. The view being passed to the method as a parameter is the searchViewLayout, which means that it makes the search view visible.
Then it adds the animation to that particular search view layout. Then, the animation is started using the start method. The following is the explanation of the showBottom method inside the enterViews method: private void showBottom View view, Animator. This animation will have a listener, which will let you know when the animation starts and when it ends.
The exitViews method will be called when the search view has to be closed. Android library provides many ways and built-in libraries for building a good UX. Besides these, you need to build your own UX patterns depending on the flow of your app. To build a good UX, you need to use animations in the right places. Understanding UX principles and how it’s different from UI The user experience is very important for keeping a user engaged with the app by making them understand what is happening on the screen.
Here is another simple material aspect of UX, where a user gets a very good experience when they click on view on the screen; the UX shows a ripple effect when the user clicks on the view: [ 77 ] Material Design Figure 3.
The ripple is high at the point of contact and gradually decreases its force. Firstly, a user should know when they click on a button and should not have a doubt whether they have clicked or not. Having this effect gives a user a very good experience when they click on a button. We will use the CardView as the outermost clickable view. We need to set a drawable for the inset. At this point, the following shape is seen in the view: It gives a color to the view, which is set is the colors.
Only when these two conditions are satisfied, is the shape drawn: shape as defined here is a rectangle, as the CardView is a rectangle with rounded corners. For Android versions later than v21, the ripple effect is built-in: [ 80 ] Material Design Here, the ripple is a built-in class, which defines the ripple effect.
It needs to set a drawable and a color. The ripple color is the same one defined earlier. Summary Material design plays an important part in how a user is able to use an app easily, and hence it makes sure that they use the app more often. In this chapter, we covered material design and followed with the material design animation.
We then processed this animation to build animation in the app. In the next section, we will cover building the core features of the foodspotting app. The idea behind this principle is to design a class that has one responsibility or various methods with unique functionality.
According to this principle, a method should not do more than one task at a time. Each function must be designated a unique task. It does not satisfy the single responsibility principle, as we are formatting the values as we are setting the text to the views. The onBindViewHolder of the recyclerView adapter is mainly responsible for binding the view with the values of its object class. In the preceding code, the onBindViewHolder is doing more tasks than it should.
If we have kept the same format in more than one place and there comes a need to make changes to the format, then we will have to make the changes everywhere and this may result in software logic duplication issues.
If we don’t update the code in some places, it may cause an error. If the code was a logical change that had been replicated, the entire flow of the app would change. To prevent this, we have to write the code in a way that we don’t have to make many changes if the features are changed.
Due to this, the change of the functionality or format can be done in the common function instead of each instance of the code. Open-Closed Principle The Open-Closed Principle states that: Software entities classes, modules, functions, etc should be open for extension, but closed for modification. This principle basically states that we have to design our modules, classes, and functions in a way that when a new functionality is needed, we should not modify our existing code but rather write new code that will be used by existing code Now let us discuss the Open-Closed Principle in the following example.
Let us assume we are trying to calculate the area of some shapes. So let’s take the example of a rectangle and a circle. The same shape interface can be now used in new classes to calculate the area without changing the AreaManager. Liskov Substitution Principle The Liskov Substitution Principle states that: Child classes should never break the parent class’ type definitions.
According to this principle, a subclass should override the parent class’s methods in a way that does not break functionality from a client’s point of view.
According to this principle, if a class is extending another class, the functionality of the child class should not conflict with that of its parent. As we know, a square is also a type of rectangle, so it can extend the Rectangle class. An ArrayList implements a List but it does not change the basic functionality of the List.
Interface Segregation Principle The Interface Segregation Principle states that: No client should be forced to depend on methods it does not use. According to this principle, if an interface has too many methods, then we need to divide the interface into smaller interfaces with fewer methods. A simple example of this principle is shown next. This violates the Interface Segregation Principle. Here we have segregated them into two different interfaces.
High-level modules should not depend on low-level modules. Both should depend on abstractions. Abstractions should not depend upon details. Details should depend upon abstractions. The best way to explain this principle is by giving an example. Let’s assume we have a worker class that is a low level class and a Manager class that is a high level class.
If we have to add another class which would be a parent of the Worker class, and the Worker class does similar work to that of the Manager class, it will require lots of changes. They are at times tough to put into practice when it comes to the usage of each individual principle, but making a habit of following these principles will keep your code readable, reusable, and easy to maintain.
It is a style of coding by which we can manage various components of the system we are making. The MVC consists of three main components: Model: The model represents the object in the application. This has the logic of where the data is to be fetched from. This can also have the logic by which the controller can update the view. In Android, the model is mostly represented by object classes. View: The view consists of the components that can interact with the user and is responsible for how the model is displayed in the application.
In Android, the view is mostly represented by the XML where the layouts can be designed. Controller: The controller acts as a mediator between the model and the view. It controls the data flow into the model object and updates the view whenever data changes. In Android, the controller is mostly represented by the activities and fragments. Therefore, to solve this problem, we can use different design patterns or can implement MVC carefully by taking care of conventions and following proper programming guidelines.
The view is an XML file, which contains a TextView, through which the name of the location can be displayed. The activity, which is the controller, contains a LocationItem.
It gets the name of the LocationItem at a specific position in the list and sets it up in the view, which displays it. It separates the view and model by using the presenter. The presenter decides what should be displayed on the view. Model: The model represents the objects in the application.
View: The view renders information to users and contains a UI Component. It does not have any other logic implemented. Presenter: The presenter layer performs the task of the controller and acts as the mediator between the view and model. But unlike the controller, it is not dependent on the view. The view interacts with the presenter for the data to be displayed, and the presenter then takes the data from the model and returns it to the view in a presentable format.
The presenter does not contain any UI components; it just manipulates data from the model and displays it on the view. The interfaces are defined in the presenter class, to which it passes the required data. The connection between the presenter and the view is one to one. This class interacts with the presenter to provide the list of locations. The loadLocations function is used by the presenter to interact with the model and fetch the list of locations. The model LocationInteractorImpl then uses the listener.
Depending on the functions called by the view, the presenter will communicate with the model and get the responses: public class LocationPresenterImpl implements LocationPresenter, LocationInteractor. This class implements LocationPresenter with which the view communicates with the presenter and the LocationInteractor. OnLoadFinishedListener from which the model communicates with the presenter. When the view calls the loadLocations function of the presenter, the presenter interacts with the model and calls the loadLocations method of the model, indicating that the model is to return the list of locations to be displayed.
The onSuccess and onFailed functions are then called by the model after the list has been fetched successfully or has failed. Then the presenter communicates with the view through the locationLoaded function. The view implements the LocationInterface, by which it gets the responses from the presenter. It is similar to the MVC model, the only difference being it has two-way data binding with the view and view-model.
The changes in the view are being propagated via the view-model, which uses an observer pattern to communicate between the view-model and the model. The view in this case is completely isolated from the model.
View-model: The view-model helps in maintaining the state of the view and does changes to the model based on the inputs gained from the view. Many views can be linked to one view-model, which creates a many-to-one relation between the view and a view-model. Also, a view has information about the view-model but the view-model does not have any information about the view.
The view is not responsible for the state of information; rather, that is being managed by the view-model and the view and the model are only reflected via the changes made to the view-model. In developer’s terminology, one can say that the view-model is the interface between a designer and a coder. An interface connects these two layers, controlling how the outer layers use the inner layers.
This kind of code architecture pattern is also known as Onion Architecture because of its different layers, as seen in the following figure: Figure 2. The outer layer uses the components from the inner layers based upon its needs, meaning the outer layers are dependent on the business logic implementations of the inner layers.
Hence, the dependency points inwards. I will outline the layers in the figure, but focus more on the Clean Architecture core conceptual rules: The Dependency Rule, Abstraction Principle, and communication between the layers: Entities: Entities form the core of your app, which means they define what exactly your app is doing.
Entities are basically objects created to make a data model to hold the business logic and the functionality that would be carried out on it. Some of the entities for an app could be a user entity, a restaurant entity, a place entity, and so on. Use cases: Use cases are in the layer that forms objects using the core entities. The use cases may contain one or more entities based upon their use. Learn about best practices and recommended architecture for building robust, production-quality apps.
Learn to make your Android apps usable by everyone, including people with accessibility needs. Use coroutines to simplify task management for commons use cases like making network calls and accessing local data. See more Android codelabs. Codelab based. Incorporate and convert Java code into Kotlin using Android Studio, and learn Kotlin language conventions along the way. Learn essential Android programming concepts and build a variety of apps using Java.
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Our team is always striving to change and improve the functionality of the application. From now on, you can open, read PDF files professionally in your phones and tablets. Let’s get the pdf viewer for android free download application now for FREE! If you love the app, please rate and take a moment to send us a comments for us via email: crismorgan gmail. Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age.
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