wav声音简谱播放器代码(Android Studio 程序源代码)

【实例截图】

【核心代码】

package com.example.mywav;


import androidx.appcompat.app.AppCompatActivity;
import android.media.AudioAttributes;
import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    private SoundPool soundPool;
    private Map<String, Integer> soundMap;
    private EditText editTextNumbers;
    private EditText editTextSpeed;

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

        soundPool = new SoundPool.Builder()
                .setMaxStreams(21)
                .setAudioAttributes(new AudioAttributes.Builder()
                        .setUsage(AudioAttributes.USAGE_MEDIA)
                        .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                        .build())
                .build();

        soundMap = new HashMap<>();
        // 加载 zero.wav
        int zeroResId = getResources().getIdentifier("zero", "raw", getPackageName());
        int zeroSoundId = soundPool.load(this, zeroResId, 1);
        soundMap.put("-", zeroSoundId);

        char[] lowNotes = {'d', 'e', 'f', 'g', 'h', 'i', 'j'};
        char[] midNotes = {'k', 'l', 'm', 'n', 'o', 'p', 'q'};
        char[] highNotes = {'r', 's', 't', 'u', 'v', 'w', 'x'};

        // 1. - 7. 对应 d - j（低音）
        for (int i = 1; i <= 7; i  ) {
            String key = i   ".";
            int resId = getResources().getIdentifier(String.valueOf(lowNotes[i - 1]), "raw", getPackageName());
            Log.d("SoundLoader", "Loading low note "   key   ", resId: "   resId);
            int soundId = soundPool.load(this, resId, 1);
            soundMap.put(key, soundId);
        }

        // 1 - 7 对应 k - q（中音）
        for (int i = 1; i <= 7; i  ) {
            String key = String.valueOf(i);
            int resId = getResources().getIdentifier(String.valueOf(midNotes[i - 1]), "raw", getPackageName());
            Log.d("SoundLoader", "Loading mid note "   key   ", resId: "   resId);
            int soundId = soundPool.load(this, resId, 1);
            soundMap.put(key, soundId);
        }

        // 1* - 7* 对应 r - x（高音）
        for (int i = 1; i <= 7; i  ) {
            String key = i   "*";
            int resId = getResources().getIdentifier(String.valueOf(highNotes[i - 1]), "raw", getPackageName());
            Log.d("SoundLoader", "Loading high note "   key   ", resId: "   resId);
            int soundId = soundPool.load(this, resId, 1);
            soundMap.put(key, soundId);
        }

        editTextNumbers = findViewById(R.id.editTextNumbers);
        editTextSpeed = findViewById(R.id.editTextSpeed);

        findViewById(R.id.playButton).setOnClickListener(view -> {
            String numbersString = editTextNumbers.getText().toString();
            String speedString = editTextSpeed.getText().toString();
            int speed = 500; // 默认速度 500 毫秒
            try {
                speed = Integer.parseInt(speedString);
            } catch (NumberFormatException e) {
                Log.e("SpeedError", "Invalid speed input", e);
            }

            int index = 0;
            while (index < numbersString.length()) {
                String key;
                if (index   1 < numbersString.length() && (numbersString.charAt(index   1) == '.' || numbersString.charAt(index   1) == '*')) {
                    key = numbersString.substring(index, index   2);
                    index  = 2;
                } else {
                    key = String.valueOf(numbersString.charAt(index));
                    index  ;
                }
                Integer soundId = soundMap.get(key);
                if (soundId != null) {
                    try {
                        soundPool.play(soundId, 1, 1, 0, 0, 1);
                    } catch (Exception e) {
                        Log.e("SoundPlayError", "Error playing sound for key "   key, e);
                    }
                }
                try {
                    Thread.sleep(speed);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        soundPool.release();
    }
}