這是一個準系統的Android項目創建一個MIDI文件,然後由外部MIDI合成器播放。出於測試目的,包括playNewMIDIFile()
。這使用Android自己的MediaPlayer播放新文件。
包含此提取物的原始問題可以找到here。
package com.example.midi;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
public class Main extends Activity {
private String file = "midi.mid";
private MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
createNewMIDIFile();
playNewMIDIFile();
}
public void createNewMIDIFile() {
Integer[] stream = new Integer[]{
//
0x4d, 0x54, 0x68, 0x64, // MThd = MIDI file designator
0x00, 0x00, 0x00, 0x06, // Standard MIDI File (SMF)
0x00, 0x01, 0x00, 0x02, // multiple-track format: 2 tracks
0x00, 0x40, // 64 ticks per beat (quarter note)
0x4D, 0x54, 0x72, 0x6B, // Header for track 1
0x00, 0x00, 0x00, 0x0B, // 11 bytes to describe the track
0x00, 0xFF, 0x51, 0x03, // set tempo:
0x0F, 0x42, 0x40, // 1,000,000 microseconds/beat: 60 bpm
0x00, 0xFF, 0x2F, 0x00, // End of track 1
0x4D, 0x54, 0x72, 0x6B, // Header for track 2
0x00, 0x00, 0x00, 0x0F, // 15 bytes to describe the track
0x00, // Immediately
0xC1, 0x01, // change instrument for track 2 to piano
0x00, // Immediately
0x91, 0x3C, 0x7F, // play middle C with a velocity of 127
0x30, // 48 ticks later (dotted eighth note)
0x81, 0x3C, 0x00, // stop playing the middle C
0x00, 0xFF, 0x2F, 0x00 // End of track 2
};
int length = stream.length;
byte[] byteStream = new byte[length];
for (int ii = 0; ii < length; ii++) {
byteStream[ii] = (byte) (stream[ii] % 256);
}
try {
FileOutputStream outputStream = openFileOutput(file, MODE_PRIVATE);
outputStream.write(byteStream);
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void play(View view) {
/* Triggered by a button defined in activity_main.xml as
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="play"
android:text="Play MIDI" />
*/
playNewMIDIFile();
}
public void playNewMIDIFile() {
try {
String filename = getFilesDir() + "/" + file;
File midifile = new File(filename);
FileInputStream inputStream = new FileInputStream(midifile);
FileDescriptor fileDescriptor = inputStream.getFD();
mediaPlayer.reset();
mediaPlayer.setDataSource(fileDescriptor);
inputStream.close();
mediaPlayer.prepare();
mediaPlayer.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}
的[誰能告訴我如何在iOS上使用CoreMIDI?]可能重複(http://stackoverflow.com/questions/13952151/can-anyone-show-me-how-to-use-coremidi -on-ios) – 2014-11-09 07:39:26
沒有。這是說明如何從您的IOS設備(即您的iPad或iPhone)連接到外部設備(即數字音樂鍵盤)。 – pashute 2014-11-10 08:21:12
「您可以使用本地CoreMIDI會話向/從另一個CoreMIDI兼容應用程序發送或接收消息」 – 2014-11-10 08:24:57