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It might be due to lots of apps on your device or the hardware of the Smartphone might be outdated or inferior, such as cheap Android devices and older Smartphones.
Even so, the type of applications on your phone, cheap or high-end can actually affect your browsing speed. All your bandwidth can be used up fast by lots of background app activities like downloads and syncing that slows the internet speed. If this be the case, Android download manager apps can help.
Outdated or mediocre apps can also slow your phone. Also, it is perhaps time to get a new high-end and efficient Smartphone. According to FCC , cell phone reception, radio and television coverage are affected by interference caused by radio frequencies. As a result, cell phone data ends up really slow. In most cases, this interference is caused by electrical equipment and transmitters. Interference is ascertained with ease whether the culprit is electric equipment or transmitter by easily unplugging any of the different electronic equipment and components in the house.
Simple tests can then be done to see if the problem is dealt with. In the process, you can actually isolate the source of the electrical interference affecting your cell phone signal.
While cellular phones make use of radio frequencies, interference protection is usually not available. Garage entry openers, doorbell transformers, electrical drills, hair dryers or even equipment such as sewing machines can also release interferences in short bursts.
Google Play Instant. Get started with instant apps. Get started with instant games. Integrate with Firebase. Play Install Referrer. Play Install Referrer Library. Application Licensing. Android GPU Inspector. System profiling. Analyze a system profile. GPU performance counters. Frame profiling. Analyze a frame profile. Frame Profiler UI. Customize or port game engines. Process input events.
Support game controllers. Achieve proper frame pacing. Frame pacing in Vulkan. Integrate Android Performance Tuner. Output audio. Manage memory. Use prebuilt or turnkey game engines.
Develop with Defold. Develop with Godot. Develop with Unity. Use Android Performance Tuner. Game best practices. Maximize device availability. Art assets. OpenGL and Vulkan. Game Mode. Best practices. Building effective unit tests. Automating UI tests. Testing app component integrations. Android Vitals. Optimizing for Battery Life. System tracing. Build and test apps for accessibility. Advanced topics. Protecting against security threats with SafetyNet. Build for Billions.
Build for Enterprise. App feedback. Device management. Dedicated devices. Android versions. Android Developers. Before you start building Before you start building a provider, consider the following: Decide if you need a content provider. You need to build a content provider if you want to provide one or more of the following features: You want to offer complex data or files to other applications.
You want to allow users to copy complex data from your app into other apps. You want to provide custom search suggestions using the search framework. You want to expose your application data to widgets.
If you haven't done so already, read the topic Content provider basics to learn more about providers and how they work. Next, follow these steps to build your provider: Design the raw storage for your data. A content provider offers data in two ways: File data Data that normally goes into files, such as photos, audio, or videos. Store the files in your application's private space. In response to a request for a file from another application, your provider can offer a handle to the file.
Store the data in a form that's compatible with tables of rows and columns. A row represents an entity, such as a person or an item in inventory. A column represents some data for the entity, such a person's name or an item's price.
A common way to store this type of data is in an SQLite database, but you can use any type of persistent storage. To learn more about the storage types available in the Android system, see the section Designing data storage. Define a concrete implementation of the ContentProvider class and its required methods. This class is the interface between your data and the rest of the Android system. For more information about this class, see the section Implementing the ContentProvider class.
The provider accommodates a wide range of data sources and tries to manage as much data as possible for each person, with the result that its organization is complex. Because of this, the provider's API includes an extensive set of contract classes and interfaces that facilitate both data retrieval and modification.
This guide assumes that you know the basics of Android content providers. To learn more about Android content providers, read the Content Provider basics guide. The Contacts Provider is an Android content provider component. It maintains three types of data about a person, each of which corresponds to a table offered by the provider, as illustrated in figure The three tables are commonly referred to by the names of their contract classes.
The classes define constants for content URIs, column names, and column values used by the tables:. The other tables represented by contract classes in ContactsContract are auxiliary tables that the Contacts Provider uses to manage its operations or support specific functions in the device's contacts or telephony applications. A raw contact represents a person's data coming from a single account type and account name.
Because the Contacts Provider allows more than one online service as the source of data for a person, the Contacts Provider allows multiple raw contacts for the same person. Multiple raw contacts also allow a user to combine a person's data from more than one account from the same account type. Most of the data for a raw contact isn't stored in the ContactsContract.
RawContacts table. Instead, it's stored in one or more rows in the ContactsContract. Data table. Each data row has a column Data. RawContacts row. The important columns in the ContactsContract.
RawContacts table are listed in table 1. Please read the notes that follow after the table:. The following are important notes about the ContactsContract. RawContacts table:. For example, if you want your app to maintain contacts data for your web-based service with the domain com.
You can explain this requirement to the user in documentation, or you can prompt the user to add the type and name, or both. Account types and account names are described in more detail in the next section. Sources of raw contacts data To understand how raw contacts work, consider the user "Emily Dickinson" who has the following three user accounts defined on her device:.
This user has enabled Sync Contacts for all three of these accounts in the Accounts settings. Suppose Emily Dickinson opens a browser window, logs into Gmail as emily.
Later on, she logs into Gmail as emilyd gmail. As noted previously, the data for a raw contact is stored in a ContactsContract.
This allows a single raw contact to have multiple instances of the same type of data such as email addresses or phone numbers. For example, if "Thomas Higginson" for emilyd gmail. Notice that different types of data are stored in this single table. Display name, phone number, email, postal address, photo, and website detail rows are all found in the ContactsContract. To help manage this, the ContactsContract. Data table has some columns with descriptive names, and others with generic names.
The contents of a descriptive-name column have the same meaning regardless of the type of data in the row, while the contents of a generic-name column have different meanings depending on the type of data. The generic column name constants always work, regardless of the type of data the row contains. The DATA1 column is indexed. The Contacts Provider always uses this column for the data that the provider expects will be the most frequent target of a query.
For example, in an email row, this column contains the actual email address. To facilitate working with the columns for a particular type of row, the Contacts Provider also provides type-specific column name constants, defined in subclasses of ContactsContract. The constants simply give a different constant name to the same column name, which helps you access data in a row of a particular type.
For example, the ContactsContract. Email class defines type-specific column name constants for a ContactsContract. Caution: Don't add your own custom data to the ContactsContract.
Data table using a row that has one of the provider's pre-defined MIME types. If you do, you may lose the data or cause the provider to malfunction.
If you use your own custom MIME type for the row, then you are free to define your own type-specific column names and use the columns however you wish.
Figure 2 shows how descriptive columns and data columns appear in a ContactsContract. Data row, and how type-specific column names "overlay" the generic column names. Figure 2. Type-specific column names and generic column names. The Contacts Provider combines the raw contact rows across all account types and account names to form a contact. This facilitates displaying and modifying all the data a user has collected for a person.
The Contacts Provider manages the creation of new contact rows, and the aggregation of raw contacts with an existing contact row. Neither applications nor sync adapters are allowed to add contacts, and some columns in a contact row are read-only. Note: If you try to add a contact to the Contacts Provider with an insert , you'll get an UnsupportedOperationException exception. If you try to update a column that's listed as "read-only," the update is ignored. The Contacts Provider creates a new contact in response to the addition of a new raw contact that doesn't match any existing contacts.
The provider also does this if an existing raw contact's data changes in such a way that it no longer matches the contact to which it was previously attached. If an application or sync adapter creates a new raw contact that does match an existing contact, the new raw contact is aggregated to the existing contact. The ContactsContract. Figure 3. Contacts, Raw Contacts, and Details table relationships. Caution: If you publish your app to the Google Play Store, or if your app is on a device running Android 10 API level 29 or higher, keep in mind that a limited set of contacts data fields and methods are obsolete.
Under the conditions mentioned, the system periodically clears any values written to these data fields:. In addition, the following fields no longer return frequent contacts. Note that some of these fields influence rankings of contacts only when the contacts are part of a specific data kind.
If your apps are accessing or updating these fields or APIs, use alternative methods. For example, you can fulfill certain use cases by using private content providers or other data stored within your app or backend systems.
To verify that your app's functionality isn't affected by this change, you can manually clear these data fields. To do so, run the following ADB command on a device running Android 4.
Users enter contacts data directly into the device, but data also flows into the Contacts Provider from web services via sync adapters , which automate the transfer of data between the device and services. Sync adapters run in the background under the control of the system, and they call ContentResolver methods to manage data.
In Android, the web service that a sync adapter works with is identified by an account type. Each sync adapter works with one account type, but it can support multiple account names for that type. Account types and account names are described briefly in the section Sources of raw contacts data.
The following definitions offer more detail, and describe how account type and name relate to sync adapters and services. Account types don't have to be unique. A user can configure multiple Google Contacts accounts and download their data to the Contacts Provider; this may happen if the user has one set of personal contacts for a personal account name, and another set for work.
Account names are usually unique. Together, they identify a specific data flow between the Contacts Provider and an external service. If you want to transfer your service's data to the Contacts Provider, you need to write your own sync adapter.
This is described in more detail in the section Contacts Provider sync adapters. Figure 4 shows how the Contacts Provider fits into the flow of data about people. In the box marked "sync adapters," each adapter is labeled by its account type. Applications that want to access the Contacts Provider must request the following permissions:. These permissions do not extend to the user profile data.
The user profile and its required permissions are discussed in the following section, The user profile. Remember that the user's contacts data is personal and sensitive.
Users are concerned about their privacy, so they don't want applications collecting data about them or their contacts. If it's not obvious why you need permission to access their contacts data, they may give your application low ratings or simply refuse to install it. Contacts table has a single row containing profile data for the device's user. This data describes the device's user rather than one of the user's contacts. The profile contacts row is linked to a raw contacts row for each system that uses a profile.
Each profile raw contact row can have multiple data rows. Constants for accessing the user profile are available in the ContactsContract.
Profile class. Access to the user profile requires special permissions. Remember that you should consider a user's profile to be sensitive. The permission android. Make sure to tell the user why you need user profile access permissions in the description of your application. To retrieve the contact row that contains the user's profile, call ContentResolver. For example, this snippet retrieves data for the profile:.
This column is set to "1" if the contact is the user profile. The Contacts Provider manages data that keeps track of the state of contacts data in the repository. This metadata about the repository is stored in various places, including the Raw Contacts, Data, and Contacts table rows, the ContactsContract.
Settings table, and the ContactsContract. SyncState table. The following table shows the effect of each of these pieces of metadata:. This prevents the provider from marking rows as dirty. Most importantly, with a single click, you can clone or create Android instances. MEmu works with all kinds of Windows desktops, laptops, and tablets. However, it may struggle to run smoothly on low-end devices. This ensure you can play Android games on a PC without lags or crashes. MEmu is one of the most trusted Android emulators available online.
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