beep

问题 I would like to make a button play a beep sound to indicate it has been pressed. I want to know how to use the default android beep sound (like when you adjust the ringer volume), instead of importing my own mp3 music file or using ToneGenerator? 回答1: public void playSound(Context context) throws IllegalArgumentException, SecurityException, IllegalStateException, IOException { Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); MediaPlayer mMediaPlayer = new

问题 In Java, is there any functions that can emit a (motherboard) beep with a given frequency and duration? In many languages I've worked with, you can; Beeps are useful for indicating certain types of errors, also for easily generating music. The standard way to beep would be either print the BEEP character (\007 or something) or to use Toolkit.beep(), neither of which allows you to specify frequency and duration. I'm thinking of implementing a native method, but there should be a library

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: How can I make the computer beep in C#? Can the computer beep at different pitches or is there only one? 回答1: The Console.Beep method has two overloads: the first version is the default beep, and the second version receives two arguments—the frequency and the duration in milliseconds. Try following program to sample different beeps your c# code can make. using System; class Program { static void Main() { for

问题 My problem: When my text box's MaxLength is reached, a beep sound is produced. I want to prevent this beeping and would even go so far as preventing all instances of beeping for my application if achievable. I'm already familiar with how to mimic MaxLength using Substring and resetting the caret but in this particular instance, substituting MaxLength is not an option. To reproduce: In Visual Studio, in design mode, drag a text box onto a fresh form. Use the following as is: Code: Public Class

问题 So my code is as such: import winsound import time length = 250 class Notes(): def frequency(halfNotesFromA4): value = 440 * ((2)**(1.0/12.0))**halfNotesFromA4 return (int)(value) def processNote(note): if(note == 'C'):return Notes.frequency(3) if(note == 'D'):return Notes.frequency(5) if(note == 'E'):return Notes.frequency(7) if(note == 'F'):return Notes.frequency(8) if(note == 'G'):return Notes.frequency(10) if(note == 'A'):return Notes.frequency(12) if(note == 'B'):return Notes.frequency

问题 I've got an industrial panel which running a 32-bit version of Windows Embedded 8 Standard. It is required to use the internal speaker to make beep sounds. Connecting external speakers is not an option. Previously this was running XP based Windows Embedded Standard and using Console.Beep in C# will use the internal speaker. However in Windows 8 Embedded Standard this seems to use the external speakers instead, despite not being connected up. The internal speaker is still operational - the

问题 I am making a Quiz program. So what I want is whenever any question in presented before the user, then he has 30 seconds to answer it. And in these 30 seconds I want the beep sound ('\a') at an interval of 1 second. Now I want is that this beep sound should stop as soon as the user enters any input. I have created this small function to produce the beep sound for 30 sec void beep(){ for(int i=0;i<30;i++){cout<<"\a"; Sleep(1000); } } But I don't know how to stop it as soon as the user enters

问题 I'm new to android development I'm working in an android app that simply changes volume and play beep "to preview current sound level" I use startTone in ToneGenerator class to generate this beep , like this : ToneGenerator tg = new ToneGenerator(AudioManager.STREAM_RING, 100); tg.startTone(ToneGenerator.TONE_PROP_BEEP); but sometimes this code doesn't work and generate following exceptions 11-20 00:32:44.262: E/AudioTrack(4701): AudioFlinger could not create track, status: -12 11-20 00:32:44

问题 I have the following code: #include <windows.h> #include <stdio.h> int main(void) { Beep(523, 500); Sleep(1000); return 0; } I am compiling it using MinGW with Dev-C++. My problem is that I can't hear anything, although I don't get an error. I have Windows 7. Any ideas? 回答1: Turn your speakers on. If they're already on, turn up the volume. If you don't have speakers and a sound card installed on your computer, then get some and install them, then try running the program again. All of these

问题 I'm working on a personal project. I want to transmit some data over the air with an old ham radio. My first draft application works like that : I construct one byte with 4 "signals" : 5000hz means "00" 6khz means "01" 7khz means "10" 8khz means "11" 9khz means same as the previous one then I merge those 4 couple of bits together and start again with the next one. The demodulation works great and should be fast enough, but I'm having an issue with the sound generation... it's slow... Here's