如何在Android中播放音频文件?
我有代码来播放.ogg
音频文件,我从互联网上下载。 我没有错误,所以我可以运行它,但然后应用程序崩溃:
package play.my.sound;
import android.app.Activity;
import android.media.AudioManager;
import android.media.SoundPool;
import android.media.SoundPool.OnLoadCompleteListener;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
public class PlaySound2Activity extends Activity {
private SoundPool soundPool;
private int soundID;
boolean loaded = false;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View view = findViewById(R.id.textView1);
view.setOnClickListener((OnClickListener) this);
// Set the hardware buttons to control the music
this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
// Load the sound
soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
soundPool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
public void onLoadComplete(SoundPool soundPool, int sampleId,
int status) {
loaded = true;
}
});
soundID = soundPool.load("sound1.ogg", 1);
}
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// Getting the user sound settings
AudioManager audioManager = (AudioManager) getSystemService (AUDIO_SERVICE);
float actualVolume = (float) audioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
float maxVolume = (float) audioManager
.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
float volume = actualVolume / maxVolume;
// Is the sound loaded already?
if (loaded) {
soundPool.play(soundID, volume, volume, 1, 0, 1f);
Log.e("Test", "Played sound");
}
}
return false;
}
}
我认为我有两个问题:
我把它放在main.xml
文件中:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:text="Click on the screen to start playing" android:id="@+id/textView1" android:layout_width="fill_parent" android:layout_height="fill_parent"></TextView> </LinearLayout>我不知道这是否正确。
我将文件sound1.ogg
放在workspace->SoundPlay2
文件夹中,因为在res文件夹中我遇到了问题,而且我试图将它放在存在的两个res文件夹中。
这是从我的控制台:
[2012-01-04 19:38:16 - PlaySound2] Failed to install PlaySound2.apk on device 'emulator-5554': timeout
[2012-01-04 19:38:16 - PlaySound2] Launch canceled!
[2012-01-04 19:47:33 - PlaySound2] Error in an XML file: aborting build.
[2012-01-04 19:52:34 - PlaySound2] reslayoutmain.xml:0: error: Resource entry main is already defined.
[2012-01-04 19:52:34 - PlaySound2] reslayoutmain.out.xml:0: Originally defined here.
[2012-01-04 19:52:34 - PlaySound2] C:UsersNataliaworkspacePlaySound2reslayoutmain.out.xml:1: error: Error parsing XML: no element found
我从“Android声音 - 教程”中找到了这个例子。 我想播放一个音频文件,更具体地说,一个.wav
文件。
我不知道我在哪里可以找到关于MediaPlayer类中允许的文件的一些信息及其特性(durantion,采样率...)您能否告诉我在哪里可以找到?
在res文件夹中创建原始文件夹并将文件添加到它。 然后使用该文件播放
soundID = soundPool.load(R.raw.sound1, 1);
还可以参阅这篇文章,了解您的main.xml问题。
我从来没有见过Class SoundPool,但是我会推荐使用MediaPlayer Class:
mMediaPlayer = new MediaPlayer(this, R.raw.yourfile);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.prepare();
mMediaPlayer.start();
确保将文件放入文件夹PROJECT / res / raw /(或者如果文件不存在则创建它)
你的main.xml也有问题。 你可以请张贴吗?
玩某种蜂鸣器的例子。 在原始文件夹下的res文件夹中,我有一个buzzer.wav
玩这个蜂鸣器的方法:
/**
* Method to play an alarm sound to signal half time or full time.
*/
private void playAlarm() {
MediaPlayer mp = MediaPlayer.create(this,
R.raw.buzzer);
mp.start();
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp.release();
}
});
}
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