7-2-1 음악 재생하기

MainActivity

package com.example.boostcoursepractice;
 
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
 
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
 
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
 
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
 
import java.io.File;
import java.net.URL;
import java.util.HashMap;
 
public class MainActivity extends AppCompatActivity {
 
    public static String url = "http://sites.google.com/site/ubiaccessmobile/sample_audio.amr";
 
    MediaPlayer player;
    int position = 0;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button button = (Button) findViewById(R.id.button);
 
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                palyAudio();
            }
        });
 
 
        Button button2 = (Button) findViewById(R.id.button2);
 
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                pauseAudio();
            }
        });
 
        Button button3 = (Button) findViewById(R.id.button3);
 
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                resumeAudio();
            }
        });
 
        Button button4 = (Button) findViewById(R.id.button4);
 
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                stopAudio();
            }
        });
 
 
    }
 
    public void palyAudio() {
        try {
            closePlayer();
 
            player = new MediaPlayer();
            player.setDataSource(url);
            player.prepare();
            player.start();
 
            Toast.makeText(this, "재생 시작됨", Toast.LENGTH_LONG).show();
 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    public void pauseAudio()
    {
        if(player != null && player.isPlaying()){
            position = player.getCurrentPosition();
            player.pause();
 
            Toast.makeText(this, "일시 정지지됨",Toast.LENGTH_LONG).show();
        }
    }
 
    public void resumeAudio()
    {
        if(player != null && !player.isPlaying()){
            player.seekTo(position);
            player.start();
 
            Toast.makeText(this, "재시작됨",Toast.LENGTH_LONG).show();
        }
    }
 
    public void stopAudio()
    {
        if(player != null && player.isPlaying()){
            player.stop();
 
            Toast.makeText(this, "중지됨",Toast.LENGTH_LONG).show();
        }
    }
 
        public void closePlayer(){
            if(player != null){
                player.release();
                player = null ;
            }
    }
}

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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">
 
    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="재생" />
 
    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="일시정지" />
 
    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="재시작" />
 
    <Button
        android:id="@+id/button4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="정지" />
</LinearLayout>
 

 

음악을 재생하기 위해서는 MediaPlayer를 이용하면 된다. 

 

구현은 위 코드대로 하면 되고 중요한 것은 스피커는 하나의 자원이기 때문에 항상 다 쓰고 나면 아래처럼

 

 if(player != null){

                player.release();

                player = null ;

            }

 

해제를 해줘야 한다.

 

 

결과화면