Android学习笔记

Android 多媒体技术

50. Android 多媒体技术——SoundPool播放音效

50.1 SoundPool

MediaPlayer虽然也能播放音频，但是它有资源占用量较高，延迟时间较长，不支持多个音频同时播放等缺点。

SoundPool一般用来播放密集、急促而短暂的音效。

50.2 使用SoundPool

准备音频文件

新建一个SoundActivity

修改跳转

布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".SoundActivity"><androidx.recyclerview.widget.RecyclerViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/recyclerView"/></androidx.constraintlayout.widget.ConstraintLayout>

调用

适配器 MyAdapter.java

package com.dingjiaxiong.mymediarecorder;import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;import java.util.List;public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> implements View.OnClickListener {private final List<SoundActivity.Sound> data;private final Context context;private final RecyclerView recyclerView;private OnItemClickListener listener;public MyAdapter(List<SoundActivity.Sound> data, RecyclerView recyclerView, Context context) {this.data = data;this.recyclerView = recyclerView;this.context = context;}@NonNull@Overridepublic MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {TextView textView = new TextView(context);LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);layoutParams.topMargin = 18;layoutParams.leftMargin = 18;textView.setLayoutParams(layoutParams);textView.setOnClickListener(this);return new MyViewHolder(textView);}@Overridepublic void onBindViewHolder(@NonNull MyViewHolder holder, int position) {((TextView) holder.itemView).setText(data.get(position).getName());}@Overridepublic int getItemCount() {return data.size();}@Overridepublic void onClick(View v) {if (listener != null) {listener.onItemClick(recyclerView.getChildAdapterPosition(v));}}public void setOnItemClickListener(OnItemClickListener listener) {this.listener = listener;}interface OnItemClickListener {void onItemClick(int position);}class MyViewHolder extends RecyclerView.ViewHolder {public MyViewHolder(@NonNull View itemView) {super(itemView);}}
}

调用

package com.dingjiaxiong.mymediarecorder;import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;import android.media.SoundPool;
import android.os.Bundle;
import android.view.View;import java.util.ArrayList;
import java.util.List;public class SoundActivity extends AppCompatActivity implements MyAdapter.OnItemClickListener {private SoundPool soundPool;static class Sound {String name;int soundId;public Sound(String name, int soundId) {this.name = name;this.soundId = soundId;}public int getSoundId() {return soundId;}public String getName() {return name;}}List<Sound> data;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_sound);RecyclerView recyclerView = findViewById(R.id.recyclerView);LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);recyclerView.setLayoutManager(linearLayoutManager);soundPool = new SoundPool.Builder().setMaxStreams(6).build();data = new ArrayList<>();data.add(new Sound("a4", soundPool.load(this, R.raw.a4, 1)));data.add(new Sound("a5", soundPool.load(this, R.raw.a5, 1)));data.add(new Sound("a6", soundPool.load(this, R.raw.a6, 1)));data.add(new Sound("a7", soundPool.load(this, R.raw.a7, 1)));data.add(new Sound("a8", soundPool.load(this, R.raw.a8, 1)));data.add(new Sound("a9", soundPool.load(this, R.raw.a9, 1)));MyAdapter myAdapter = new MyAdapter(data, recyclerView, this);myAdapter.setOnItemClickListener(this);recyclerView.setAdapter(myAdapter);}@Overridepublic void onItemClick(int position) {Sound sound = data.get(position);soundPool.play(sound.getSoundId(),1.0f, 1.0f, 1, 0, 1.0f);}@Overrideprotected void onDestroy() {super.onDestroy();for (Sound datum : data) {soundPool.unload(datum.getSoundId());}soundPool.release();}
}

运行

是有声音的。OK