项目中遇到的问题,跟大家分享
开发环境:Android Studio
项目中用到的类(关键):SoundPool
项目github地址:https://github.com/zw21544182/BtMusicDemo
项目中所用到的关键知识:
1.基类抽取—(abstract)BaseActivity
2.单例模式—SoundPoolUtil
3.SoundPool类Api运用
最终效果由于涉及到声音就不好贴出来了
先来了解一下SoundPool
构造函数:SoundPool (int maxStreams, int streamType, int srcQuality)
参数解释:
maxStreams | streamType | srcQuality |
---|---|---|
最大的流的数量 | 流的类型建议AudioManager.STREAM_SYSTEM | 频的质量,默认是0,目前没有影响 |
加载音频:load(Context context, int resId, int priority)
参数解释:
context | resId | priority |
---|---|---|
上下文对象(不bb) | 资源id(用来指定音频文件位置) | 优先级:都是短促音频无影响设置为1即可 |
播放音频:play(int soundID, float leftVolume, float rightVolume, int priority, int loop, float rate)
参数解释:
soundID | leftVolume | rightVolume | priority | loop | rate |
---|---|---|---|---|---|
音频的序号(load到SoundPool的顺序,从1开始) | 左��声道的音量控制, 0.0 到 1.0 | 优先级,0是最低优先级 | 优先级,0是最低优先级 | 是否循环播放,0为不循环,-1为循环 | 播放比率,从0.5到2,一般为1,表示正常播放 |
由于布局比较简单,就不贴代码了
我们可以用单例模式来初始化SoundPool类:具体代码如下:
package zw.btmusicdemo.util;import android.content.Context;import android.media.AudioManager;import android.media.SoundPool;import android.util.Log;import zw.btmusicdemo.R;/** * Created by zhongwang on 2017/9/8. */public class SoundPoolUtil { private static SoundPoolUtil soundPoolUtil; private SoundPool soundPool; //单例模式 public static SoundPoolUtil getInstance(Context context) { if (soundPoolUtil == null) soundPoolUtil = new SoundPoolUtil(context); return soundPoolUtil; } private SoundPoolUtil(Context context) { soundPool = new SoundPool(3, AudioManager.STREAM_SYSTEM, 0); //加载音频文件 soundPool.load(context, R.raw.music1, 1); soundPool.load(context, R.raw.music2, 1); soundPool.load(context, R.raw.music3, 1); } public void play(int number) { Log.d("tag", "number " + number); //播放音频 soundPool.play(number, 1, 1, 0, 0, 1); } }
第二步 抽取基类BaseActivity
1.通过枚举来限制音频播放种类
2.通过abstract让click方法在子类中实现
3.在子类click方法中控制播放哪种音频
package zw.btmusicdemo.base;import android.app.Activity;import android.os.Bundle;import android.support.annotation.Nullable;import android.view.View;import android.widget.Toast;import zw.btmusicdemo.util.SoundPoolUtil;/** * Created by zhongwang on 2017/9/8. * 可以设置按钮点击音效的基类activity */public abstract class BaseActivity extends Activity implements View.OnClickListener { private SoundPoolUtil soundPoolUtil; private int soundId = 0; //默认播放 music1 private MusicType musicType = MusicType.FIRST; /** * 设置点击按钮音乐类型 * * @param musicType FIRST SECOND THIRD三个参数 */ public void setMusicType(MusicType musicType) { this.musicType = musicType; } /** * 定义枚举来限定按钮音乐类型 */ public enum MusicType { FIRST, SECOND, THIRD } @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); soundPoolUtil = SoundPoolUtil.getInstance(this); } /** * 在该方法中调用setMusicType来控制点击音乐类型 * @param v */ public abstract void click(View v); @Override public void onClick(View v) { click(v); switch (musicType) { case FIRST: soundId = 1; break; case SECOND: soundId = 2; break; case THIRD: soundId = 3; break; } soundPoolUtil.play(soundId); } public void toast(String content) { Toast.makeText(this, content, Toast.LENGTH_SHORT).show(); } }
最后 在子类MainActivity中的运用
package zw.btmusicdemo.activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import zw.btmusicdemo.R;import zw.btmusicdemo.base.BaseActivity;public class MainActivity extends BaseActivity { private Button button1; private Button button2; private Button button3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button1 = (Button) findViewById(R.id.button1); button2 = (Button) findViewById(R.id.button2); button3 = (Button) findViewById(R.id.button3); button1.setOnClickListener(this); button2.setOnClickListener(this); button3.setOnClickListener(this); } @Override public void click(View v) { switch (v.getId()) { case R.id.button1: setMusicType(MusicType.FIRST); toast("点击了按钮1"); break; case R.id.button2: setMusicType(MusicType.SECOND); toast("点击了按钮2"); break; case R.id.button3: setMusicType(MusicType.THIRD); toast("点击了按钮3"); break; } } }