Android SharedPreferences use key-value pairs to store data. This is an easier way for data storage operation in android. You do not need to care about file operation. You just need to get the SharedPreferences object, give it a key and related value. Then invoke SharedPreferences object’s apply() or commit() method. Then android OS will save […]
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Android data can be saved in internal storage ( ROM ), external storage(SD card), shared preferences, or SQLite database. This article will introduce how to read and write data in internal storage via a java file.
Android Read Write Internal Storage File Example Read More »
Android device monitor is a tool that can be used to monitor files in your android device ( physical device or emulator ). It also provides functions to pull files from the device to your PC or push files from your PC to an android device.
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This example will show you how to implement force log out when the same user account login in another instance of the same android app. It will use both android Activity, Service, and Broadcast Receiver components to implement.
Android Force Logout Use Service And Broadcast Example Read More »
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
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This article include examples about how to create and send custom normal or ordered broadcast. It also illustrate how to abort the broadcast in the ordered broadcast receiver chain. If you do not know about android broadcast, you can read Android Broadcast Overview or Android Broadcast to learn.
Android Send Custom Broadcast Example Read More »
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.
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This example will tell you how to use the android Seekbar to adjust the screen brightness. This example only takes effect on real physical android device, it will not take effect in the android emulator.
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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.
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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.
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