Shape, selector, and layer-list are usually used to create custom drawable resources in android development. Those three XML elements can save a lot of UI resources and time if being used properly. This article will show you how to use them correctly.
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android.widget.ProgressBar is a sub-class of android.view.View. It is the parent class of both AbsSeekBar, RatingBar, SeekBar and ContentLoadingProgressBar. This article will introduce ProgressBar properties and how to customize ProgressBar for your needs.
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Android’s message queue and queue looper are aimed at the specific thread, a thread can have it’s own message queue and queue looper. 1. Android Message Queue And Looper Introduction. If you want to send messages between different threads, you need to add a message object in that thread’s message queue. Then the queue looper
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We often need to format numbers, such as taking two decimal places for a number, show only the integer part of a number, etc. Java provides java.text.DecimalFormat class, which can help you to format numbers use your specified pattern as quickly as possible.
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Android splash screen is a popular screen effect in app development. It is always used in below two scenarios. Show app logo or company info in several seconds when the app initialize. The splash screen show time is fixed in this case. Show something when the app load data from a web server in the
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DatePicker and TimePicker are all extends android.widget.FrameLayout. They are used to display the date and time selection widget in the android applications. They can be used in either spinner mode or calendar mode ( date picker), clock mode ( time picker ). You can control their appearance with their properties.
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When you use the android widget in layout XML or java code, you may encounter error messages like Call requires API level 23 (current min is 17):. This means your current android minimum SDK version is 1.7, which is too low to use this widget. You need to change it to 23. This article will
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android.graphics.Matrix is the class that be used to process images in android. This article will show you examples of how to use android.graphics.Matrix to rotate, scale, skew and translate bitmap images in android.
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android.widget.ImageView is android image manipulation class. It can be used to load images, show images, and edit images. This article will introduce this class to you and show you an example to demonstrate it’s functions.
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android.os.CountDownTimer is an abstract class that provides a count-down timer function. You must create a sub-class of it to use. This example will show you how to use android.os.CountDownTimer to implement a verification code retrieval function.
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