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This article will explain in detail what kinds of tools are commonly used in Android. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

This paper mainly introduces and summarizes the tool classes commonly used in Android development, most of which are also applicable to Java. At present, it includes HttpUtils, DownloadManagerPro, ShellUtils, PackageUtils, PreferencesUtils, JSONUtils, FileUtils, ResourceUtils, StringUtils, ParcelUtils, RandomUtils, ArrayUtils, ImageUtils, ListUtils, MapUtils, ObjectUtils, SerializeUtils, SystemUtils, TimeUtils. The English version of this article see:Android Common Utils all the code is in TrineaAndroidCommon@Github, welcome Star or Fork ^ _ *, in addition to these tool classes, this project also includes caching, drop-down ListView, and so on. For more information on APIs, please see TrineaAndroidCommon API Guide. Specific use: you can directly introduce TrineaAndroidCommon as the library of your project (how to pull the replacement code and add a common library), or extract part of it yourself.

1 、 HttpUtils

Http network tool class, including httpGet, httpPost and methods related to http parameters. Take httpGet as an example:

Static HttpResponse httpGet (HttpRequest request)

Static HttpResponse httpGet (java.lang.String httpUrl)

Static String httpGetString (String httpUrl)

It contains the above three methods. Gzip compression is used by default and bufferedReader is used to improve the reading speed.

Url, timeout, userAgent and other http parameters can be set in HttpRequest

You can get the returned content, http response code, http expiration time (max-age and expires of Cache-Control) in HttpResponse, etc.

The first two methods can set advanced parameters and return rich content, and the third method can simply input url to get the returned content, similar to httpPost. For more detailed settings, you can use HttpURLConnection or apache's HttpClient directly.

The source code can be seen in HttpUtils.java, and more methods and more detailed parameters can be described in HttpUtils Api Guide.

2 、 DownloadManagerPro

Android system download management DownloadManager enhancement method, which can be used to include access to download-related information, such as:

GetStatusById (long) gets download status

GetDownloadBytes (long) gets download progress information

GetBytesAndStatus (long) gets download progress information and status

GetFileName (long) gets the download file path

GetUri (long) gets the download uri

GetReason (long) gets reasons for download failure or pause

GetPausedReason (long) gets the reason for download suspension

GetErrorCode (long) gets the download error code

The source code can be seen in DownloadManagerPro.java, and more methods and more detailed parameters can be described in DownloadManagerPro Api Guide. About Android DownManager using visible DownManager Demo.

3 、 ShellUtils

The Android Shell utility class, which can be used to check system root permissions and execute shell commands under shell or root users. Such as:

CheckRootPermission () checks root permissions

ExecCommand (String [] commands, boolean isRoot, boolean isNeedResultMsg) shell environment executes commands. The second parameter indicates whether the root permission is executed.

ExecCommand (String command, boolean isRoot) shell environment executes commands

The source code can be seen in ShellUtils.java, and more methods and more detailed parameters can be described in ShellUtils Api Guide. About silent installation visible apk-root permissions silent installation.

4 、 PackageUtils

Android package related tool classes, which can be used to (root) install applications, (root) uninstall applications, determine whether system applications, etc., such as:

Install (Context, String) installs the application. If it is a system application or has already root, install it silently, otherwise, install it generally.

Uninstall (Context, String) uninstalls the application. If it is a system application or has already root, it will be uninstalled silently, otherwise it will generally be uninstalled.

IsSystemApplication (Context, String) determines whether the application is a system application.

The source code can be seen in PackageUtils.java, and more methods and more detailed parameters can be described in ShellUtils Api Guide. About silent installation visible apk-root permissions silent installation.

5 、 PreferencesUtils

Android SharedPreferences related utility classes, which can be used to easily read and write related type data to SharedPreferences, such as:

PutString (Context, String, String) saves string type data

PutInt (Context, String, int) saves int type data

GetString (Context, String) to get string type data

GetInt (Context, String) to get int type data

You can modify preference name by modifying the PREFERENCE_NAME variable

The source code can be seen in PreferencesUtils.java, and more methods and more detailed parameters can be described in PreferencesUtils Api Guide.

6 、 JSONUtils

JSONUtils utility class, which can be used to easily read and write related type data to Json, such as:

String getString (JSONObject jsonObject, String key, String defaultValue) gets string type value

String getString (String jsonData, String key, String defaultValue) gets string type value

Indicates that the value of a String type key is read from json

GetMap (JSONObject jsonObject, String key) gets map

GetMap (String jsonData, String key) gets map

Indicates that the value of a Map type key is read from json

The source code can be seen in JSONUtils.java, and more methods and more detailed parameters can be described in JSONUtils Api Guide.

7 、 FileUtils

File tool class, can be used to read and write files and manipulate files. Such as:

ReadFile (String filePath) read the file

WriteFile (String filePath, String content, boolean append) to write files

GetFileSize (String path) gets the file size

DeleteFile (String path) delete files

The source code can be seen in FileUtils.java, and more methods and more detailed parameters can be described in FileUtils Api Guide.

8 、 ResourceUtils

The Android Resource utility class, which can be used to read from the raw and assets directories of the android resource directory, such as:

GeFileFromAssets (Context context, String fileName) gets the contents of a file in the assets directory

GeFileFromRaw (Context context, int resId) gets the contents of a file in the raw directory

The source code can be seen in ResourceUtils.java, and more methods and more detailed parameters can be described in ResourceUtils Api Guide.

9 、 StringUtils

String utility class, which can be used for common string manipulation, such as:

IsEmpty (String str) determines whether the string is empty or the length is 0

IsBlank (String str) determines whether the string is empty or has a length of 0 or consists of spaces

Utf8Encode (String str) is encoded in utf-8 format

CapitalizeFirstLetter (String str) initials are capitalized

The source code can be seen in StringUtils.java, and more methods and more detailed parameters can be described in StringUtils Api Guide.

10 、 ParcelUtils

Android Parcel utility class that can be used to read or write special types of data from parcel, such as:

ReadBoolean (Parcel in) reads boolean type data from pacel

ReadHashMap (Parcel in, ClassLoader loader) reads map type data from pacel

WriteBoolean (boolean b, Parcel out) writes boolean type data to parcel

WriteHashMap (Map map, Parcel out, int flags) writes map type data to parcel

The source code can be seen in ParcelUtils.java, and more methods and more detailed parameters can be described in ParcelUtils Api Guide.

11 、 RandomUtils

Random number utility class, which can be used to obtain random numbers within fixed-size fixed characters, such as:

GetRandom (char [] sourceChar, int length) generates a random string with all characters within a string

GetRandomNumbers (int length) generates random numbers

The source code can be seen in RandomUtils.java, and more methods and more detailed parameters can be described in RandomUtils Api Guide.

12 、 ArrayUtils

Array utility class, which can be used for common array operations, such as:

IsEmpty (V [] sourceArray) determines whether the array is empty or the length is 0

GetLast (V [] sourceArray, V value, V defaultValue, boolean isCircle) gets the first element of an element in the array, and isCircle indicates whether it is a loop.

GetNext (V [] sourceArray, V value, V defaultValue, boolean isCircle) gets the next element of an element in the array, and isCircle indicates whether to loop.

The source code can be seen in ArrayUtils.java, and more methods and more detailed parameters can be described in ArrayUtils Api Guide.

13 、 ImageUtils

Picture tool class, can be used for Bitmap, byte array, Drawable conversion and picture zooming, the current function is weak, will be enhanced later. Such as:

BitmapToDrawable (Bitmap b) bimap converted to drawable

DrawableToBitmap (Drawable d) drawable converted to bitmap

DrawableToByte (Drawable d) drawable converted to byte

ScaleImage (Bitmap org, float scaleWidth, float scaleHeight) zooms the picture

The source code can be seen in ImageUtils.java, and more methods and more detailed parameters can be described in ImageUtils Api Guide.

14 、 ListUtils

List utility class, which can be used for common List operations, such as:

IsEmpty (List sourceList) determines whether the List is empty or the length is 0

Join (List list, String separator) List is converted to a string and separated by a fixed delimiter

AddDistinctEntry (List sourceList, V entry) adds non-repeating elements to list

The source code can be seen in ListUtils.java, and more methods and more detailed parameters can be described in ListUtils Api Guide.

15 、 MapUtils

Map utility class, which can be used for common Map operations, such as:

IsEmpty (Map sourceMap) determines whether the map is empty or the length is 0

ParseKeyAndValueToMap (String source, String keyAndValueSeparator, String keyAndValuePairSeparator, boolean ignoreSpace) strings are parsed to map

ToJson (Map map) map is converted to json format

The source code can be seen in MapUtils.java, and more methods and more detailed parameters can be described in MapUtils Api Guide.

16 、 ObjectUtils

Object utility class, which can be used for common Object operations, such as:

IsEquals (Object actual, Object expected) compares whether two objects are equal

Compare (V v1, V v2) compare the size of two objects

TransformIntArray (int [] source) Integer array converted to int array

The source code can be seen in ObjectUtils.java, and more methods and more detailed parameters can be described in ObjectUtils Api Guide.

17 、 SerializeUtils

Sequence chemicals classes that can be used to serialize objects to or from files, such as:

Deserialization (String filePath) deserializes objects from a file

Serialization (String filePath, Object obj) serializes objects to files

The source code can be seen in SerializeUtils.java, and more methods and more detailed parameters can be described in SerializeUtils Api Guide.

18 、 SystemUtils

The system information tool class, which can be used to get the appropriate size of the thread pool, is currently weak and will be enhanced later. Such as:

GetDefaultThreadPoolSize () gets the thread pool size that matches the system configuration

The source code can be seen in SystemUtils.java, and more methods and more detailed parameters can be described in SystemUtils Api Guide.

19 、 TimeUtils

Time tool class, which can be used for time-related operations, such as:

GetCurrentTimeInLong () gets the current time

GetTime (long timeInMillis, SimpleDateFormat dateFormat) converts long to a fixed format time string

The source code can be seen in TimeUtils.java, and more methods and more detailed parameters can be described in TimeUtils Api Guide.

This is the end of this article on "what tools are commonly used in Android". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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