Android聲音播放

佈局文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ch_2013_4_9playsound"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.ch_2013_4_9playsound.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Activity：

package com.example.ch_2013_4_9playsound;

import java.util.HashMap;

import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

@SuppressLint("UseSparseArrays")
public class MainActivity extends Activity implements OnClickListener {

	Button btn_play;
	Button btn_play1;
	Button btn_stop;
	Button btn_stop1;

	SoundPool sp;
	HashMap<Integer, Integer> spMap;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		InitSound();
		Init();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	public void Init() {
		btn_play = (Button) findViewById(R.id.btn_play);
		btn_play1 = (Button) findViewById(R.id.btn_play1);
		btn_stop = (Button) findViewById(R.id.btn_stop);
		btn_stop1 = (Button) findViewById(R.id.btn_stop1);
		
		btn_play.setOnClickListener(this);
		btn_play1.setOnClickListener(this);
		btn_stop.setOnClickListener(this);
		btn_stop1.setOnClickListener(this);
	}

	public void InitSound() {
		sp = new SoundPool(5, AudioManager.STREAM_MUSIC, 0);
		spMap = new HashMap<Integer, Integer>();
		spMap.put(1, sp.load(this, R.raw.fire, 1));
		spMap.put(2, sp.load(this, R.raw.hit, 1));

	}

	public void playSound(int sound, int number) {
		AudioManager am = (AudioManager) this
				.getSystemService(Context.AUDIO_SERVICE);
		float audioMaxVolumn = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
		float volumnCurrent = am.getStreamVolume(AudioManager.STREAM_MUSIC);
		float volumnRatio = volumnCurrent / audioMaxVolumn;

		sp.play(spMap.get(sound), volumnRatio, volumnRatio, 1, number,  1f);
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if (v == btn_play) {
			playSound(1, 0);
			Toast.makeText(this, "play1", Toast.LENGTH_SHORT).show();
		}
		if (v == btn_play1) {
			playSound(2, 1);
			Toast.makeText(this, "play2", Toast.LENGTH_SHORT).show();
		}
		if (v == btn_stop) {
			sp.pause(spMap.get(1));
			Toast.makeText(this, "stop", Toast.LENGTH_SHORT).show();
		}
		if (v == btn_stop1) {
			sp.pause(spMap.get(2));
			Toast.makeText(this, "stop1", Toast.LENGTH_SHORT).show();
		}
	}

}