안드로이드 앱 뮤직플레이어 넣기

https://developer.android.com/guide/topics/media/mediaplayer?hl=ko

MediaPlayer 개요  |  Android 개발자  |  Android Developers

song1.mp3 raw 폴더에 붙여넣기

package com.androidappstudy.seekbarmusicapp;

import androidx.appcompat.app.AppCompatActivity;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Switch;

public class MainActivity extends AppCompatActivity {

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

        final MediaPlayer mPlayer;
        mPlayer = MediaPlayer.create(this, R.raw.song1);

        final Switch switch1 = findViewById(R.id.switch1);
        switch1.setOnClickListener(new View.OnClickListener(){
            @Override
            public  void onClick(View view){
                if (switch1.isChecked() == true)
                    mPlayer.start();
                else {
                    mPlayer.stop();
                }
            }
        });
    }
}

makeThread alt+ shift +enter 누르면

void makeTread 함수가 생성된다.

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat 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"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <Switch
        android:id="@+id/switch1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="음악듣기" />

    <SeekBar
        android:id="@+id/pmMP3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        />
</androidx.appcompat.widget.LinearLayoutCompat>

package com.androidappstudy.seekbarmusicapp;

import androidx.appcompat.app.AppCompatActivity;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.SeekBar;
import android.widget.Switch;

public class MainActivity extends AppCompatActivity {

    MediaPlayer mPlayer;
    SeekBar pbMP3;
    Switch switch1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("SeekBar Music 앱!");

        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setIcon(R.drawable.ic_launcher_foreground);

        pbMP3 = findViewById(R.id.pmMP3);
        switch1 = findViewById(R.id.switch1);
        switch1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (switch1.isChecked() == true){
                    mPlayer = MediaPlayer.create(getApplicationContext(), R.raw.song1);
                    mPlayer.start();
                    makeThread();
                }else {
                    mPlayer.stop();
                }
            }
        });

        pbMP3.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (fromUser){
                    mPlayer.seekTo(progress);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }

    void makeThread() {
        new Thread(){
            @Override
            public void run() {
                    //음악이 계속 작동 중이라면
                while (mPlayer.isPlaying()){
                    //음악의 시간을 최대로 설정
                    pbMP3.setMax(mPlayer.getDuration());
                    // 현재 위치를 지정
                    pbMP3.setProgress(mPlayer.getCurrentPosition());
                    SystemClock.sleep(100);
                }
                pbMP3.setProgress(0);
            }
        }.start();
    }
}

노래가 나온다!