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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Android provides three clock widgets that you can use to implement a clock. They are android.widget.AnalogClock, android.widget.DigitalClock and android.widget.TextClock. The AnalogClock and DigitalClock class have been deprecated since Android SDK version 1.7, but they can still be used. TextClock class is recommended.
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android.text.style.ReplacementSpan class is a supper span class that you can extend to create your customized span class. You can draw anything as you want in your custom span class, and then use it to replace the specified characters in your textview string.
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android.text.SpannableString is a character sequence type class. You can use it as a String object in android TextView. But SpannableString can make TextView content more colorful and diverse. This article will show you examples about how to use SpannableString with TextView.
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android.widget.MultiAutoCompleteTextView class is used to implement multiple auto-complete input text control in android applications. It behaves similar to the class android.widget.AutoCompleteTextView, the difference is that it can let you input text with autocomplete function multiple times. Each text in the input text box is separated by a specified token string.
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In android development, you can store string values in the file app/res/values/strings.xml. Then refer to it in your java code. This can avoid hardcode string values in your XML or java source file.
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