이 예는 Android 앱에서 기본 오디오 플레이어를 구현하기 위해 Mediaplayer 클래스를 생성하는 방법을 보여줍니다.
1단계 − Android Studio에서 새 프로젝트를 생성하고 파일 ⇒ 새 프로젝트로 이동하여 필요한 모든 세부 정보를 입력하여 새 프로젝트를 생성합니다.
2단계 − res/layout/activity_main.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="10dp" android:paddingRight="10dp"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Now Playing: " android:layout_marginTop="30dp" android:textAppearance="?android:attr/textAppearanceMedium" /> <TextView android:id="@+id/txtSongName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/textView" android:layout_toEndOf="@+id/textView" /> <ImageButton android:id="@+id/btnBackward" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="44dp" android:layout_marginLeft="20dp" android:src="@drawable/ic_back" /> <ImageButton android:id="@+id/btnPlay" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/btnBackward" android:layout_marginLeft="20dp" android:layout_toRightOf="@+id/btnBackward" android:src="@drawable/ic_play" /> <ImageButton android:id="@+id/btnPause" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/btnPlay" android:layout_marginLeft="20dp" android:layout_toRightOf="@+id/btnPlay" android:src="@drawable/ic_pause" /> <ImageButton android:id="@+id/btnForward" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/btnPause" android:layout_marginLeft="20dp" android:layout_toRightOf="@+id/btnPause" android:contentDescription="@+id/imageButton3" android:src="@drawable/ic_forward" /> <TextView android:id="@+id/txtStartTime" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/seekBar" android:text="0 min, 0 sec" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@+id/btnBackward" android:layout_toLeftOf="@+id/txtSongTime" android:layout_toRightOf="@+id/txtStartTime" /> <TextView android:id="@+id/txtSongTime" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@+id/btnForward" android:layout_alignTop="@+id/seekBar" android:text="0 min, 0 sec " /> </RelativeLayout>
3단계 − src/MainActivity.java
에 다음 코드 추가import android.media.MediaPlayer;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import java.util.concurrent.TimeUnit;
public class MainActivity extends AppCompatActivity {
private ImageButton forwardBtn, backwardBtn, pauseBtn, playBtn;
private MediaPlayer mediaPlayer;
private TextView songName, startTime, songTime;
private SeekBar songProgress;
private static int onTime =0, playTime =0, endTime =0, forwardTime = 5000, backwardTime = 5000;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
backwardBtn = findViewById(R.id.btnBackward);
forwardBtn = findViewById(R.id.btnForward);
playBtn = findViewById(R.id.btnPlay);
pauseBtn = findViewById(R.id.btnPause);
songName = findViewById(R.id.txtSongName);
startTime = findViewById(R.id.txtStartTime);
songTime = findViewById(R.id.txtSongTime);
songName.setText("Bohemian_Rhapsody");
mediaPlayer = MediaPlayer.create(this, R.raw.bohemian_rhapsody);
songProgress = findViewById(R.id.seekBar);
songProgress.setClickable(false);
pauseBtn.setEnabled(false);
playBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Playing Audio", Toast.LENGTH_SHORT).show();
mediaPlayer.start();
endTime = mediaPlayer.getDuration();
playTime = mediaPlayer.getCurrentPosition();
if (onTime == 0) {
songProgress.setMax(endTime);
onTime = 1;
}
songTime.setText(String.format("%d min, %d sec",
TimeUnit.MILLISECONDS.toMinutes(endTime),
TimeUnit.MILLISECONDS.toSeconds(endTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(endTime))));
startTime.setText(String.format("%d min, %d sec",
TimeUnit.MILLISECONDS.toMinutes(playTime),
TimeUnit.MILLISECONDS.toSeconds(playTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(playTime))));
songProgress.setProgress(playTime);
handler.postDelayed(UpdateSongTime, 100);
pauseBtn.setEnabled(true);
playBtn.setEnabled(false);
}
});
pauseBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mediaPlayer.pause();
pauseBtn.setEnabled(false);
playBtn.setEnabled(true);
Toast.makeText(getApplicationContext(), "Pausing Audio", Toast.LENGTH_SHORT).show();
}
});
forwardBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if ((playTime + forwardTime) <= endTime) {
playTime = playTime + forwardTime;
mediaPlayer.seekTo(playTime);
} else {
Toast.makeText(getApplicationContext(), "Cannot jump forward 5 seconds", Toast.LENGTH_SHORT).show();
}
if (!playBtn.isEnabled()) {
playBtn.setEnabled(true);
}
}
});
backwardBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if ((playTime - backwardTime) > 0) {
playTime = playTime - backwardTime;
mediaPlayer.seekTo(playTime);
} else {
Toast.makeText(getApplicationContext(), "Cannot jump backward 5 seconds", Toast.LENGTH_SHORT).show();
}
if (!playBtn.isEnabled()) {
playBtn.setEnabled(true);
}
}
});
}
private Runnable UpdateSongTime = new Runnable() {
@Override
public void run() {
playTime = mediaPlayer.getCurrentPosition();
startTime.setText(String.format("%d min, %d sec",
TimeUnit.MILLISECONDS.toMinutes(playTime),
TimeUnit.MILLISECONDS.toSeconds(playTime) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(playTime))) );
songProgress.setProgress(playTime);
handler.postDelayed(this, 100);
}
};
} 4단계 - androidManifest.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="https://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
응용 프로그램을 실행해 보겠습니다. 실제 Android 모바일 장치를 컴퓨터에 연결했다고 가정합니다. Android 스튜디오에서 앱을 실행하려면 프로젝트의 활동 파일 중 하나를 열고 도구 모음에서 실행 아이콘을 클릭합니다. 모바일 장치를 옵션으로 선택한 다음 기본 화면을 표시할 모바일 장치를 확인하십시오 –
