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Introduction In android devices the most useful feature is to store and read the files within the device storage or an external storage. This allows users to expand their device storage capacity so that they can store and retrieve files according to their convenience and can use them accordingly. In this article we will take a look at How to save files on external storage in Android. Implementation We will be creating a simple application in which we will be creating a text view for displaying the heading of our application.After that we will be creating an edit text field ... Read More
Introduction Many times while building an android application we have to store data in the form of files within our android application. We will read and write string data inside our file. In this article we will take a look on How to Read/Write string from a file in Android Implementation We will be creating a simple application in which we will be firstly writing the data in that file which the user can enter through edit text. After that we will be reading the data stored in that file by clicking a button and displaying that within our text ... Read More
In a Swift dictionary, we can search for an element that is either a key or value with the help of contains() function. The contains() function will return a boolean value which represents whether the specified element(key or value) is found or not. Syntax dict.contains{$0.key == “KeyName”} Here, dict is the dictionary. The contains() function returns a boolean value which represents the result. Here we pass a closure in the function which will check if the current key is equal to the specified key or not and then return the result accordingly. Algorithm Step 1 − Create a ... Read More
In Swift, a dictionary is an unordered collection of key-value pairs. So, to replace the value of a key Swift provides bracket notation or subscript notations. Using this notation we can also add new key-value pair in the dictionary if the specified pair does not exist. Syntax dict[keyName] = “Value” Here, dict is the dictionary. The keyName represents the key whose value you want to replace, and the Value represent the new value. Algorithm Step 1 − Create a dictionary with key-value pairs. Step 2 − Display the original dictionary. Step 3 − Now replace the value of ... Read More
Introduction Many times we have seen a case while developing an android application that we have set the same style for multiple views across our application. We have seen writing the code to set the style multiple times. To reduce the code duplication and optimization of our code we can create the style for a specific view in our styles.xml file and set that style to our view programmatically. In this article we will take a look on How to programmatically set the style attribute in a view on Android. Implementation We will be creating a simple application in which ... Read More
Sometimes a dictionary contains null values so to remove those null values Swift provides an in-built function named the filter() method. In the filter() method, we pass a closure which returns a boolean value indicating whether the key-value pair should be included in the resultant dictionary or not. Or we can say that if the second element(value) of a key-value pair is not nil, then it will be included in the resultant dictionary. Otherwise not. Syntax dict.filter{$0.1 != nil} Here, dict is the dictionary. The filter() function return key-value pairs which satisfy the given closure. The closure returns true ... Read More
In Swift dictionary, we cannot have duplicate keys but can have duplicate values hence in this article we will remove duplicate values from the dictionary. So for that, we use contains() function. This function checks if the dictionary contains duplicate values or not. If the dictionary contains duplicate values, then it will remove them from the resultant dictionary. Syntax dict.values.contains(val) Here, dict is the resultant dictionary in which we will store unique key-value pairs and the contains() function compares two values with each other. Algorithm Step 1 − Create a dictionary named as myCityRank with key-value pairs. Step ... Read More
In Swift, we can remove an element from the specified dictionary using the removeValue() function. This function removes the specified key and its associated value from the given dictionary. Syntax Dict.removeValue(forKey: key) Here, the key represents the key which we wanted to remove from the dictionary along with its value, and the dict represents the dictionary. Algorithm Step 1 − Create a dictionary with key-value pairs. Step 2 − Print the original dictionary. Step 3 − Remove a key-value pair whose key is 2 using the removeValue() function. Step 4 − Print the updated dictionary. Example In ... Read More
In a dictionary, to remove all the elements from the dictionary Swift provides an inbuilt function named as removeAll() function. It will remove all the key-value pairs from the specified dictionary. Syntax dict.removeAll() Here, dict is the dictionary. The removeAll() function does not take any parameter and removes all the key-value pairs present in the specified dictionary. Algorithm Step 1 − Create a dictionary with key-value pairs. Step 2 − Print the original dictionary. Step 3 − Now remove all the key-value pairs from the dictionary using removeAll() function. Step 4 − Print the output. Example In ... Read More
A dictionary is an unordered collection in which data is stored in the form of key-value pairs. To print the keys and values of a dictionary Swift supports the following methods − Using for-in loop Using properties Method 1: Using for-in Loop To print keys and values of the given dictionary we can use a for-in loop. The for-in loop iterates through each pair of the dictionary and displays them on the output screen. Syntax for(key, value) in dict{ print(“\(key) = \(value)”) } Here, the key represents the key and value represents the associated ... Read More