Android studio音乐播放器

package and.yjg.music_app.Music; import androidx.annotation.RequiresApi; import androidx.appcompat.app.ActionBar; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.content.ComponentName; import android.content.Intent; import android.content.ServiceConnection; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.SeekBar; import android.widget.TextView; import and.yjg.music_app.R; import static java.lang.Integer.parseInt; @RequiresApi(api = Build.VERSION_CODES.KITKAT) public class MusicActivity extends AppCompatActivity implements View.OnClickListener{ //定义歌曲名称的数组 public String[] musicName={"光年之外","红色高跟鞋"}; private static SeekBar sb;//定义进度条 private static TextView tv_progress, tv_total, name_song;//定义开始和总时长,歌曲名控件 // private ObjectAnimator animator;//定义旋转的动画 private MusicService.MusicControl musicControl;//音乐控制类 private Button play; //播放按钮 private Button pause; //暂停按钮 private Button con; //继续播放按钮 private Button pre; //上一首按钮 private Button next; //下一首按钮 private ImageView exit; //退出按钮 private TextView song_name; //歌手图片框 Intent intent1, intent2; //定义两个意图 MyServiceConn conn; //服务连接 private boolean isUnbind = false;//记录服务是否被解绑 public int change = 0; //记录下标的变化值 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_music); //去除标题栏 ActionBar actionBar = getSupportActionBar(); if(actionBar!= null){ actionBar.hide(); } //获得意图 intent1 = getIntent(); //初始化 initView(); } //初始化 private void initView(){ //依次绑定控件 tv_progress = findViewById(R.id.tv_progress); tv_total = findViewById(R.id.tv_total); sb = findViewById(R.id.sb); name_song = findViewById(R.id.name); song_name = findViewById(R.id.song_name); play = findViewById(R.id.btn_play); pause = findViewById(R.id.btn_pause); con = findViewById(R.id.btn_continue_play); pre = findViewById(R.id.btn_pre); next = findViewById(R.id.btn_next); //依次设置监听器 play.setOnClickListener(this); pause.setOnClickListener(this); con.setOnClickListener(this); pre.setOnClickListener(this); next.setOnClickListener(this); // exit.setOnClickListener(this); //创建意图对象 intent2 = new Intent(this, MusicService.class); conn = new MyServiceConn();//创建服务连接对象 bindService(intent2, conn,BIND_AUTO_CREATE);//绑定服务 //从歌曲列表传过来的歌曲名 String name = intent1.getStringExtra("name"); //设置歌曲名显示 name_song.setText(name); //定义歌曲列表传过来的下标position String position = intent1.getStringExtra("position"); //将字符串转化为整型i int i = parseInt(position); //歌名置为frag1里面的图标数组，下标为i song_name.setTextSize(SongPage.icons[i]); //为滑动条添加事件监听 sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { if (progress == sb.getMax()){ } } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { int progress = seekBar.getProgress(); musicControl.seekTo(progress); } }); } //歌曲进度条的消息机制 @SuppressLint("HandlerLeak") public static Handler handler = new Handler(){//创建消息处理器对象 //在主线程中处理从子线程发送过来的消息 @SuppressLint({"HandlerLeak", "SetTextI18n"}) @Override public void handleMessage(Message msg){ Bundle bundle = msg.getData();//获取从子线程发送过来的音乐播放进度 int duration = bundle.getInt("duration"); int currentPosition = bundle.getInt("currentPosition"); sb.setMax(duration); sb.setProgress(currentPosition); //歌曲总时长，单位为毫秒 int minute = duration/1000/60; int second = duration/1000%60; String strMinute = null; String strSecond = null; if(minute < 10){//如果歌曲的时间中的分钟小于10 strMinute = "0" + minute;//在分钟的前面加一个0 }else{ strMinute = minute + ""; } if (second < 10){//如果歌曲中的秒钟小于10 strSecond = "0" + second;//在秒钟前面加一个0 }else{ strSecond = second + ""; } tv_total.setText(strMinute + ":" + strSecond); //歌曲当前播放时长 minute = currentPosition/1000/60; second = currentPosition/1000%60; if(minute < 10){//如果歌曲的时间中的分钟小于10 strMinute = "0" + minute;//在分钟的前面加一个0 }else{ strMinute=minute + " "; } if (second < 10){//如果歌曲中的秒钟小于10 strSecond = "0" + second;//在秒钟前面加一个0 }else{ strSecond = second + " "; } tv_progress.setText(strMinute + ":" + strSecond); } }; //用于实现连接服务 class MyServiceConn implements ServiceConnection{ @Override public void onServiceConnected(ComponentName name, IBinder service){ musicControl=(MusicService.MusicControl) service; } @Override public void onServiceDisconnected(ComponentName name){ } } //未解绑则解绑 private void unbind(boolean isUnbind){ if(!isUnbind){//判断服务是否被解绑 musicControl.pausePlay();//暂停播放音乐 unbindService(conn);//解绑服务 } } @RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override public void onClick(View v) { //获取歌曲名的下标字符串 String index = intent1.getStringExtra("position"); //将字符串转为整数 int i = parseInt(index); switch (v.getId()){ case R.id.btn_play://播放按钮点击事件 play.setVisibility(View.INVISIBLE); musicControl.play(i); break; //这里musicName.length-1表示的最后一首歌的下标，即歌曲总数-1 case R.id.btn_pre://播放上一首 if((i + change) < 1) { change = musicName.length - 1 - i; song_name.setTextSize(SongPage.icons[i + change]); name_song.setText(musicName[i + change]); musicControl.play(i + change);