Android global broadcast makes different android apps’ communication easy and clear, but it also has below security issues. Any android apps can send the same broadcast intent action which your application broadcast receiver listens. This issue can make your app being attacked. Any android apps can listen to your app’s broadcast receiver registered action. So […]

In some cases, you may need to create a broadcast receiver that can still run in the background after the Android app exits. This example will just tell you how to do that using a broadcast receiver and Android service object.

This example will show you how to change the android device screen brightness programmatically. You can only see the effect with this example on a real physical android device, if you run it in an android emulator, it will not take effect.

When you write an android app, you sometimes may need to change system settings. For example, change the android device screen brightness. But such action needs your app to have android.permission.WRITE_SETTINGS permission, otherwise you may encounter the exception with the message java.lang.SecurityException: com.dev2qa.example was not granted this permission: android.permission.WRITE_SETTINGS.

There are a lot of android devices with different screen sizes and resolutions. This article will tell you how to make an android program load layout files dynamically based on the device’s screen resolution or size at run time.

An activity can be configured with four launch modes, each launch mode is used in one special scenario. This article will introduce all the four launch modes of activity with examples.

Although ActionBar provides users with a globally unified interface style and operation, it doesn’t mean that all applications’ ActionBars have to be exactly the same. If you need to modify the style of your Action Bar to better match your application, you can make it very simple by using Android styles and themes.

This example will show you how to use android.support.v7.widget.SearchView class to add a search box and implement autocomplete function for the search box. It also demos how to use android.support.v7.widget.ShareActionProvider to open the share application list for your android application. You can see the example demo video at the end of this article.

The android.widget.PopupWindow class is another class that provides a popup window function besides AlertDialog. There is something different between them. This example will show you how to use the android.widget.PopupWindow in the android application.

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.