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\右声道的音量控制, 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;
}
}
}
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