从 res/raw 播放声音 [英] Play a sound from res/raw
问题描述
我正在制作一个应用程序,它应该用 mediaPlayer 播放一些声音.这是我使用的代码:
I m making an app which is supposed to play a few sounds with the mediaPlayer. This is the code i use :
String[] name = {"sonar_slow","sonar_medium","sonar_fast"};
String link = "/res/raw/" + name[state-1] + ".mp3";
try {
player.setDataSource(link);
player.prepare();
player.start();
} catch(Exception e) {
e.printStackTrace();
}
我也试过这个:
if(state==1){
player.create(this, R.raw.sonar_slow);
}else if(state==2){
player.create(this, R.raw.sonar_medium);
}else if(state==3){
player.create(this, R.raw.sonar_fast);
}
player.start();
但是以上都没有奏效.我的应用程序没有崩溃,但没有播放声音.有什么想法吗?
But none of the above is working. My app is not crashing but the sound is not playing. Any ideas ?
推荐答案
有两个问题.
您不能以这种方式引用项目/res/raw 目录中的资源.您项目目录中的文件/res/raw/sonar_slow.mp3"未存储在您的apk中的/res/raw/sonar_slow.mp3"中.而不是以下内容:
You cannot reference resources inside your projects /res/raw directory in this fashion. The file "/res/raw/sonar_slow.mp3" in your project directory is not stored in "/res/raw/sonar_slow.mp3" in your apk. Instead of the following:
MediaPlayer mp = MediaPlayer.create(this);
mp.setSource("sonar_slow");
你需要使用
MediaPlayer mp = MediaPlayer.create(this, R.raw.sonar_slow);
问题 2
以下是错误的:它调用了一个不修改player
的静态方法.
player.create(this, R.raw.sonar_slow);
你应该打电话
player = MediaPlayer.create(this, R.raw.sonar_slow);
完整解决方案
下面是一个可重用的AudioPlayer 类,它封装了MediaPlayer.这是从Android 编程:大书呆子牧场指南"稍作修改的.一定要记得清理资源
Full solution
Below is a reusable AudioPlayer class that encapsulates MediaPlayer. This is slightly modified from "Android Programming: The Big Nerd Ranch Guide". It makes sure to remember to clean up resources
package com.example.hellomoon;
import android.content.Context;
import android.media.MediaPlayer;
public class AudioPlayer {
private MediaPlayer mMediaPlayer;
public void stop() {
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
}
public void play(Context c, int rid) {
stop();
mMediaPlayer = MediaPlayer.create(c, rid);
mMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
stop();
}
});
mMediaPlayer.start();
}
}
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