volume equalizer for android

The MediaPlayer class for music media playback in Android is defined as followsFinal MediaPlayer Mprain = mediaplayer.create (this, r.raw.rain);The file is Res/raw/rain.mp3//raw I created it myself in Androidstudio.My own usage here is that there is only one button, click Use, if it stops on playback, otherwise start playing, attach code1Mprain.setlooping (true);2Buttonrain.setonclicklistener (NewButton.onclicklistener () {3 @Override4 Pu

to put the business logic into the HAL Library . Step 2 : Write HALThe HAL library is an ordinary Linux Library (*.so ) file. However, this type of library file has an interface. The SYM variable is module_info through the HAL. Service Library is defined in this interface by the ID positioning hallibrary the. Step 3 : Write the Service LibraryAlthough this step is not required, the new HAL architecture requires us to do so. the Service library is also a Linux library . This step is more flexib

Basic knowledge The most familiar unit for measuring sound intensity is decibels (decibel, abbreviated to DB). This is an dimensionless relative unit , and the formula is as follows: The molecule is the measured sound pressure, the denominator is the reference value of the sound pressure (20 micro-PA, human can hear the minimum sound pressure). So in daily speaking, the sound intensity is how many decibels, is the default of a very small reference value. and the

Problem Description:"Test Steps" 1, the desktop simultaneously press and hold power and volume-"Test Result" no sound"Expected result" should not have no soundThis is a Google common problem for the following reasons:Decode does not complete when first capture.Solution:for Audio Sound pool case, skip EOS delay time-to-faster to send-out EOS.Modified Location: Frameworks/av/media/libstagefright/awesomeplayer.cppvoid Awesomeplayer::p ostcheckaudiostatus

By learning Android Deep Exploration (Volume one) HAL and driver development in the seventh chapter let me know how to control the light emitting diode through the driver, realize the driver directly interacts with the hardware.A complete Linux driver mainly consists of internal processing and hardware interaction, in which the internal processing mainly refers to the Linux driver loading, unloading, device

to delete the Showasaction property and change the Styles.xml resource file inside the menu resource file:Delete the code marked with the Red line:To change the Style.xml resource file:[HTML]View PlainCopyprint? style name= "apptheme" parent="Android:Theme.Light"> style> Third, change the class file inherits the object is activity[Java]View PlainCopyprint? Public class Mainactivity extends Activity Importing activity packs and removing unnecessary packages

file system (/dev). /proc is a virtual file system, which means that/proc is not a real file system, but a memory map.Debugging Tools:Debug the user space program with GDB, remotely debug the user space program with Gdbserver, and debug the kernel program remotely with KGDB.When you find that there are too many bugs in a piece of code, it is difficult to find out through the PRINTK function output information, consider using KGDB to locate the bug in step by step mode.Read "

Linux drivers is very important, is to modify the Linux driver source code, should try not to modify the Linux The driver interface. In a complete Linux Drive, mainly consists of internal processing and hardware interaction two parts. If the inter-Linux porting between different versions , the main porting of the first part, on different hardware platforms, then the main second part. Software 1308 class 31st Zhang Fan Blog Park address: http://home.cnblogs.com/u/sxauzzz/

extinguished. The ARM processor has multiple registers, by setting the values of different registers. You can set the status of the LED PIN, open or disable the pull-up (pull-up) circuit, and control the light and off of the LEDs.4. Control LEDLED drivers can use the following two ways to control LEDs:The LED is controlled by a string,Control led by l/0 command;To control LEDs, use both of these methods. The LED driver must receive the corresponding data. If the LED is controlled by a string. Y