volume locker for android

Today, we have a requirement in the project to use seekbar to control the volume. I thought it was a very simple thing (it was indeed a very simple thing), but at the beginning it could not achieve what I wanted. After some modifications and searches, the solution was finally solved. In the process of solving this problem, I also found some shortcomings in my understanding of Android. So, let's discuss it

Previously in the Android 4.4 volume adjustment Process Analysis (a) there is a simple analysis of the volume control process, today I would like to continue to analyze the volume size calculation method. There is a fixed-size volume Volume_max for any playback file, and the

This article translated from: http://developer.android.com/training/managing-audio/volume-playback.html Good user experience is predictable. If your application needs to play multimedia, it is vital that you can use the hardware or software of your device to control the volume, such as Bluetooth headsets or microphones. Similarly, when appropriate, your application should provide media playback operations s

In-depth understanding of Android: Volume IIBasic InformationAuthor: Deng fanpingPress: Machinery Industry PressISBN: 9787111389187Mounting time:Published on: February 1, August 2012Start: 16Page number: 1Version: 1-1Category: Computer> Software and programming> mobile development> android For more information, see "deep understanding of

In Android, you can use a program to get the ringtones and volume of the system's mobile phone. You can also set the ringtone and volume. Android provides the audiomanager class for volume acquisition and volume control. This arti

I carefully studied the problem of the volume curve some time ago. As we all know, the voice perception of human ears is not linear, but logarithm. Therefore, the ideal volume curve should be a linear relationship between the adjustment of the volume level and the logarithm of the volume size. That is: -20lg (y) = A *

Android microphone custom View with dynamic display of Audio Tape Volume 1. The so-called no picture, no truth, first. What we need to achieve is the button of the middle recording, and the surrounding area will display a waveform of the volume size. 2. VolumCircleBar inherits from View and we have customized it. The Code is as follows: VcD4KPHByZSBjbGFzcz

Ubuntu Linux10.04 above version of the operating system.GNU c is an extension of standard C and is the most commonly used C language compilation environment under Linux.Five Linux device drivers:device-driven communication hardware and software, and distinguish between the hardware, to make a clear responsibility for the engineers and engineers, do not need soft and hard balance. device driver and hardware direct interaction abstraction interface, so that the application software can be driven

chapter source code download and compile This chapter android android The source code of the application in the system and Span style= "font-family:arial;" >android SDK The source code of the various tools and so on, of course, before we know these sources, the first thing we should do is configure android

For Android volume adjustment, the volume can be divided into key adjust volume and settings. Let's start by talking about the volume adjustment in the settings.First, the volume of the classification:1.audiomanager.stream_voice_c

(1) Procedures Android API's AudioManager provides a method to adjust the volume of mobile phones. audioMa.adjustVolume(AudioManager.ADJUST_LOWER, 0); audioMa.adjustVolume(AudioManager.ADJUST_RAISE, 0);You can also adjust the voice mode of your phone to vibrate or mute. AudioMa. setRingerMode (AudioManager. RINGER_MODE_NORMAL ); AudioMa. setRingerMode (AudioManager. RINGER_MODE_SILENT ); AudioMa. setRinge

) {myimage.setimagedrawable ( Getresources (). getdrawable (R.drawable.normal));} else if (mode = = audiomanager.ringer_mode_silent) {myimage.setimagedrawable (Getresources (). Getdrawable ( R.drawable.mute));} else if (mode = = Audiomanager.ringer_mode_vibrate) {myimage.setimagedrawable (Getresources (). Getdrawable ( r.drawable.vibrate));}}); Normalbutton.sEtonclicklistener (New Onclicklistener () {public void OnClick (View v) {Audioma.setringermode (Audiomanager.ringer_mode _normal);

The volume service of Android is mainly used to manage external storage devices such as USB/SD card. The platform can perform operations and polling on external storage devices. When the status of the external storage device changes, the volume service will immediately report to the platform. The relevant code is mainly located:System/CORE/voldFrameworks/base/ser

command execution)#add-apt-repository "Deb Http://archive.canonical.com/lucid partner"#apt-get Update#apt-get Install SUN-JAVA6-JDKInstalling the Android SDK1,: http://developer.android.com/sdk/index.html2, download the SDK, get Android-sdk_r16_linux.tar file3, copy to a directory in the Linux file system, and then enter the directory and unzip the Linux terminal4, after the decompression directory more th

provides a class to control the volume and vibration of the system. Android. Media. audiomanager uses this class.Set the phone to mute or vibrate, and change the vibration type. Audiomanager cannot be instantiated in code. You need to obtain its instance through context. getsystemservice (context. audio_service. OK. After obtaining the audiomanager instance, we can call the audiomanager method setringermod

Intent is very common in Android programming, and it has been shown in "Android" to use bundles to transfer values between multiple activity (clicking the Open link) to wake up other activity and pass data between the activity. In fact, the role of intent is far from this, it can also invoke other inherent programs in the system, such as making calls, sending text messages and so on. OnKeyDown is also the c

Structure Analysis6. Publish your apk as an Android built-in program7. Test the System.img file with the simulatorSecond, download and compile the Linux kernel source code1. Download the Linux kernel source codeDirectory structure of 2.Linux kernel source code3. Install the Android kernel's build environment(1) Preparation: Copy the arm-linux-gcc-4.3.2.tgz file and the arm-none-linux-gnueabi-arm-2008q3-72-

In Class I studied Android Deep Exploration (Volume one) of this book. The first section of the textbook details how to build and use the Ubuntn Linux12.04 LTS, Android Simulator and s3c6410 Development Board.First of all, I learned that Android is a very good embedded operating system. Android's system architecture is

Changing the system default volume requires two places:1. Frameworks\base\media\java\android\media\audiomanager.java1 /**@hide Default Volume index values for audio streams*/2 Public Static Final int[] Default_stream_volume =New int[] {34,//Stream_voice_call47,//Stream_system55,//stream_ring68,//One ,//Stream_music76,//Stream_alarm85,//stream_notification97,

The android program obtains and sets the ringtone and volume.Obtain the ringtones and volume of the Android mobile phone through a program. Similarly, you can set the ringtone and volume easily! Audiomanager maudiomanager = (audiomanager) getsystemservice (context. audio_service );// Call