Android带播放进度条的音乐播放器
16lz
2021-01-23
Android带播放进度条的音乐播放器
前言: 使用MediaPlayer实现Android的音乐播放器，能够播放、暂停、停止歌曲；同时使用SeekBar来控制音乐的播放进度，可以通过调节SeekBar的进度来控制播放进度。
效果图如下：
1. 第一步
布局文件activity_main.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_margin="20dp" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:orientation="vertical" android:layout_marginTop="20dp" android:layout_width="match_parent" android:layout_height="wrap_content"> <TextView android:id="@+id/music_name" android:layout_gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <SeekBar android:id="@+id/seekBar" android:layout_marginTop="80dp" android:layout_width="match_parent" android:layout_height="wrap_content"/> <LinearLayout android:layout_below="@id/seekBar" android:layout_alignEnd="@id/seekBar" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/music_cur" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="/"/> <TextView android:id="@+id/music_length" android:layout_width="wrap_content" android:layout_height="wrap_content"/> LinearLayout> RelativeLayout> LinearLayout> <LinearLayout android:gravity="center" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageButton android:id="@+id/play" android:src="@mipmap/bofang" android:background="@null" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <ImageButton android:id="@+id/pause" android:src="@mipmap/pause" android:background="@null" android:layout_marginLeft="20dp" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <ImageButton android:id="@+id/stop" android:src="@mipmap/stop" android:background="@null" android:layout_marginLeft="20dp" android:layout_width="wrap_content" android:layout_height="wrap_content"/> LinearLayout> <LinearLayout android:gravity="bottom|right" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageButton android:id="@+id/volume_plus" android:src="@mipmap/volume_increase" android:background="@null" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <ImageButton android:id="@+id/volume_decrease" android:src="@mipmap/volume_decrease" android:background="@null" android:layout_marginTop="20dp" android:layout_width="wrap_content" android:layout_height="wrap_content"/> LinearLayout>RelativeLayout>2. 第二步
Activity——MusicActivity
public class MusicActivity extends AppCompatActivity implements View.OnClickListener { private ImageButton play,pause,stop,volume_plus,volume_decrease; private TextView musicName,musicLength,musicCur; private SeekBar seekBar; private MediaPlayer mediaPlayer = new MediaPlayer(); private AudioManager audioManager; private Timer timer; int maxVolume,currentVolume; private boolean isSeekBarChanging;//互斥变量，防止进度条与定时器冲突。 private int currentPosition;//当前音乐播放的进度 SimpleDateFormat format; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_music); audioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE); format = new SimpleDateFormat("mm:ss"); play = (ImageButton) findViewById(R.id.play); pause = (ImageButton) findViewById(R.id.pause); stop = (ImageButton) findViewById(R.id.stop); volume_plus = (ImageButton) findViewById(R.id.volume_plus); volume_decrease = (ImageButton) findViewById(R.id.volume_decrease); musicName = (TextView) findViewById(R.id.music_name); musicLength = (TextView) findViewById(R.id.music_length); musicCur = (TextView) findViewById(R.id.music_cur); seekBar = (SeekBar) findViewById(R.id.seekBar); seekBar.setOnSeekBarChangeListener(new MySeekBar()); play.setOnClickListener(MusicActivity.this); pause.setOnClickListener(MusicActivity.this); stop.setOnClickListener(MusicActivity.this); volume_plus.setOnClickListener(MusicActivity.this); volume_decrease.setOnClickListener(MusicActivity.this); if (ContextCompat.checkSelfPermission(MusicActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(MusicActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1); }else { initMediaPlayer();//初始化mediaplayer } } private void initMediaPlayer() { try { mediaPlayer.setDataSource("/sdcard/music.mp3");//指定音频文件的路径 mediaPlayer.prepare();//让mediaplayer进入准备状态 mediaPlayer.setLooping(true); mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { public void onPrepared(MediaPlayer mp) { seekBar.setMax(mediaPlayer.getDuration()); musicLength.setText(format.format(mediaPlayer.getDuration())+""); musicCur.setText("00:00"); musicName.setText("music.mp3"); } }); } catch (Exception e) { e.printStackTrace(); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode) { case 1: if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { initMediaPlayer(); } else { Toast.makeText(MusicActivity.this,"denied access",Toast.LENGTH_SHORT).show(); finish(); } break; default: } } @Override public void onClick(View view) { switch (view.getId()){ case R.id.play: if (!mediaPlayer.isPlaying()) { mediaPlayer.start();//开始播放 mediaPlayer.seekTo(currentPosition); //监听播放时回调函数 timer = new Timer(); timer.schedule(new TimerTask() { Runnable updateUI = new Runnable() { @Override public void run() { musicCur.setText(format.format(mediaPlayer.getCurrentPosition())+""); } }; @Override public void run() { if(!isSeekBarChanging){ seekBar.setProgress(mediaPlayer.getCurrentPosition()); runOnUiThread(updateUI); } } },0,50); } break; case R.id.pause: if (mediaPlayer.isPlaying()) { mediaPlayer.pause();//暂停播放 } break; case R.id.stop: Toast.makeText(MusicActivity.this,"停止播放",Toast.LENGTH_SHORT).show(); if (mediaPlayer.isPlaying()) { mediaPlayer.reset();//停止播放 initMediaPlayer(); } break; //音量加 case R.id.volume_plus: maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC); audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE,AudioManager.FLAG_SHOW_UI); currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC); Toast.makeText(MusicActivity.this,"音量增加,最大音量是：" + maxVolume + "，当前音量" + currentVolume, Toast.LENGTH_SHORT).show(); break; //音量减 case R.id.volume_decrease: maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC); audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_LOWER,AudioManager.FLAG_SHOW_UI); currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC); Toast.makeText(MusicActivity.this,"音量减小,最大音量是：" + maxVolume + "，当前音量" + currentVolume, Toast.LENGTH_SHORT).show(); break; default: break; } } @Override protected void onDestroy() { super.onDestroy(); isSeekBarChanging = true; if (mediaPlayer != null) { mediaPlayer.stop(); mediaPlayer.release(); mediaPlayer = null; } if (timer != null){ timer.cancel(); timer = null; } } /*进度条处理*/ public class MySeekBar implements SeekBar.OnSeekBarChangeListener { public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { } /*滚动时,应当暂停后台定时器*/ public void onStartTrackingTouch(SeekBar seekBar) { isSeekBarChanging = true; } /*滑动结束后，重新设置值*/ public void onStopTrackingTouch(SeekBar seekBar) { isSeekBarChanging = false; mediaPlayer.seekTo(seekBar.getProgress()); } }总结: 就这样我们就使用MediaPlayer实现了简单的音乐播放器，能够播放、暂停、停止歌曲；同时使用SeekBar来控制音乐的播放进度，通过调节SeekBar的进度我们就可以实现播放进度的控制。
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