安卓中的音池示例
原文:https://www . geesforgeks . org/sound pool-in-Android-in-with-examples/
在本文中，我们将学习如何在安卓中添加 【音池】 类。音频样本的集合可以从资源加载到内存中，并且可以使用。 SoundPool 类用于播放短的重复声音，而 MediaPlayer 类用于播放较长的片段，如音乐。它使用媒体播放器服务来解码音频。外汇:-一个游戏包括几个级别的游戏。对于每个级别，都有一组仅由该级别使用的独特声音。为此，我们使用了 SoundPool 类来做我们的工作。因此，学习 SoundPool 课程可以更好地理解如何处理短音频剪辑。
进场:
- 创建一个新的安卓资源目录，为此 右键单击资源文件夹- >安卓资源目录， 确保选择资源类型为原始。在这个原始文件夹中粘贴您的音频剪辑。
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在 activity_main.xml 文件中添加以下代码。这里添加了三个按钮。每个按钮如果被点击将调用播放声音方法。
activity _ main . XML
```java <?xml version="1.0" encoding="utf-8"?>
<Button android:id="@+id/button_sound1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="playSound" android:text="Game Over" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" />
<Button android:id="@+id/button_sound2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="playSound" android:text="Player Died" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.472" />
<Button android:id="@+id/button_sound3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="playSound" android:text="Level Complete" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.472" />
```
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Add the following code in MainActivity.java file. Here, an object of SoundPool class is created and three audio clips, game_over, level_complete and player_died are added using load method. playSound method is also added which plays the audio clip associated with the respective button.
MainActivity.java
```java package org.geeksforgeeks.gfgsoundpool;
import androidx.appcompat.app.AppCompatActivity; import android.media.AudioAttributes; import android.media.AudioManager; import android.media.SoundPool; import android.os.Build; import android.os.Bundle; import android.view.View;
public class MainActivity extends AppCompatActivity { SoundPool soundPool; int game_over, level_complete, player_died;
@Override protected void onCreate( Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { AudioAttributes audioAttributes = new AudioAttributes .Builder() .setUsage( AudioAttributes .USAGE_ASSISTANCE_SONIFICATION) .setContentType( AudioAttributes .CONTENT_TYPE_SONIFICATION) .build(); soundPool = new SoundPool .Builder() .setMaxStreams(3) .setAudioAttributes( audioAttributes) .build(); } else { soundPool = new SoundPool( 3, AudioManager.STREAM_MUSIC, 0); }
// This load function takes // three parameter context, // file_name and priority. game_over = soundPool .load( this, R.raw.game_over, 1); level_complete = soundPool.load( this, R.raw.level_complete, 1); player_died = soundPool.load( this, R.raw.player_died, 1); }
public void playSound(View v) { switch (v.getId()) {
case R.id.button_sound1:
// This play function // takes five parameter // leftVolume, rightVolume, // priority, loop and rate. soundPool.play( game_over, 1, 1, 0, 0, 1); soundPool.autoPause(); break;
case R.id.button_sound2: soundPool.play( player_died, 1, 1, 0, 0, 1); break;
case R.id.button_sound3: soundPool.play( level_complete, 1, 1, 0, 0, 1); break; } } } ```
输出:
https://media.geeksforgeeks.org/wp-content/uploads/20200630220913/20200630-220134-720x1600.mp4
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