Android开发简易音乐播放器

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package com.example.cungu.musicdemo;


import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Build;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.LinearInterpolator;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextSwitcher;

import java.text.SimpleDateFormat;
import java.util.Date;


public class MainActivity extends AppCompatActivity implements View.OnClickListener,
 Runnable, ServiceConnection, SeekBar.OnSeekBarChangeListener {
 private ImageView disc,needle,playingPre,playingPlay,playingNext;
 private ObjectAnimator discAnimation,needleAnimation;//自定义指针和唱盘
 private boolean isPlaying = true;//0,1 判断是否处于播放状态

 //声明服务
 private static final String TAG = MainActivity.class.getSimpleName();
 private MediaService.MusicController mMusicController;
 //使用方法：mMusicController.play();播放 mMusicController.pause();暂停
 private boolean running;
 private TextSwitcher mSwitcher;
 private SeekBar mSeekBar;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 //设置透明栏
 if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
  Window window = getWindow();
  window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS
   | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
  window.getDecorView().setSystemUiVisibility(
   View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
  );
  window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
  window.setStatusBarColor(Color.TRANSPARENT);
 }
 //滑动条部分
 mSeekBar = (SeekBar) findViewById(R.id.music_seek_bar);
 mSeekBar.setOnSeekBarChangeListener(this);
 mSwitcher = (TextSwitcher) findViewById(R.id.text_switcher);
 mSwitcher.setInAnimation(this, android.R.anim.fade_in);
 mSwitcher.setOutAnimation(this, android.R.anim.fade_out);
 Intent intent = new Intent(this, MediaService.class);
 //增加StartService，来增加后台播放功能
 startService(intent);
 // 绑定服务，使用context来绑定
 // 那个界面需要绑定 就用哪个 Activity
 // 参数1：Intent  代表需要绑定哪一个Service
 // 参数2：ServiceConnection 回调接口，可以接收到Service连接成功和断开的回调，成功就可以取到对象。
 // 绑定服务 参数2就是服务和指定的对象绑定在一起
 bindService(intent, this, BIND_AUTO_CREATE);

 //指针和唱片部分
 initViews();//定义背景图
 setAnimations();
 }
 private void initViews() {
 playingPre = (ImageView) findViewById(R.id.playing_pre);
 playingPlay = (ImageView) findViewById(R.id.playing_play);
 playingNext = (ImageView) findViewById(R.id.playing_next);
 disc = (ImageView) findViewById(R.id.disc);
 needle = (ImageView) findViewById(R.id.needle);
 playingPre.setOnClickListener(this);
 playingPlay.setOnClickListener(this);
 playingNext.setOnClickListener(this);
 }
 //动画设置
 private void setAnimations() {
 discAnimation = ObjectAnimator.ofFloat(disc, "rotation", 0, 360);
 discAnimation.setDuration(20000);
 discAnimation.setInterpolator(new LinearInterpolator());
 discAnimation.setRepeatCount(ValueAnimator.INFINITE);

 needleAnimation = ObjectAnimator.ofFloat(needle, "rotation", 0, 25);
 needle.setPivotX(0);
 needle.setPivotY(0);
 needleAnimation.setDuration(800);
 needleAnimation.setInterpolator(new LinearInterpolator());
 }

 @Override
 public void onClick(View v) {
 int id = v.getId();
 switch (id) {
  case R.id.playing_pre://前一曲
  if (discAnimation != null) {
   discAnimation.end();
   playing();
  }
  break;
  case R.id.playing_play://播放中
  if (isPlaying){
   playing();
  }else {
   if (needleAnimation != null) {
   needleAnimation.reverse();
   needleAnimation.end();
   mMusicController.pause();
   }
   if (discAnimation != null && discAnimation.isRunning()) {
   discAnimation.cancel();
   mMusicController.pause();
   float valueAvatar = (float) discAnimation.getAnimatedValue();
   discAnimation.setFloatValues(valueAvatar, 360f + valueAvatar);
   }
   playingPlay.setImageResource(R.drawable.music_play);
   isPlaying = true;
  }
  break;
  case R.id.playing_next://下一曲
  if (discAnimation != null) {
   discAnimation.end();
   playing();
  }
  break;
  default:
  break;
 }
 }

 //播放：1、播放音乐 2、动画旋转 3、暂停图片切换为播放按钮图片
 private void playing(){
 needleAnimation.start();
 discAnimation.start();
 playingPlay.setImageResource(R.drawable.music_pause);
 mMusicController.play();//播放
 isPlaying = false;
 }
//===================================播放歌曲服务开启、停止、结束===============================
 @Override
 protected void onStart() {
 super.onStart();
 Thread thread = new Thread(this);
 thread.start();
 }

 @Override
 protected void onStop() {
 running = false;
 super.onStop();
 }

 @Override
 protected void onDestroy() {
 // 解除绑定
 unbindService(this);
 super.onDestroy();
 }

 //---------------------播放到当前音乐的滑动条及时间设置--------------------------
 @Override
 public void run() {
 running = true;
 try {
  while (running) {
  if (mMusicController != null) {
   long musicDuration = mMusicController.getMusicDuration();
   final long position = mMusicController.getPosition();
   final Date dateTotal = new Date(musicDuration);
   final SimpleDateFormat sb = new SimpleDateFormat("mm:ss");
   mSeekBar.setMax((int) musicDuration);
   mSeekBar.setProgress((int) position);
   mSwitcher.post(
    new Runnable() {
    @Override
    public void run() {
     Date date = new Date(position);
     String time = sb.format(date) + "/" + sb.format(dateTotal);
     mSwitcher.setCurrentText(time);
    }
    }
   );
  }

  Thread.sleep(500);
  }
 } catch (InterruptedException e) {
  e.printStackTrace();
 }
 }

 //-----------------------------
 //服务绑定与解除绑定的回调

 /**
 * 当服务与当前绑定对象，绑定成功，服务onBind方法调用并且返回之后
 * 回调给这个方法
 *
 * @param name
 * @param service IBinder 就是服务 onBind 返回的对象
 */
 @Override
 public void onServiceConnected(ComponentName name, IBinder service) {
 mMusicController = ((MediaService.MusicController) service);
 }

 @Override
 public void onServiceDisconnected(ComponentName name) {
 mMusicController = null;
 }

 public void btnStopService(View view) {
 Intent intent = new Intent(this, MediaService.class);
 stopService(intent);
 }

 @Override
 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
 }

 @Override
 public void onStartTrackingTouch(SeekBar seekBar) {
 }

 @Override
 public void onStopTrackingTouch(SeekBar seekBar) {
 mMusicController.setPosition(seekBar.getProgress());
 }
}

package com.example.cungu.musicdemo;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.Environment;
import android.os.IBinder;


public class MediaService extends Service {
 private MediaPlayer mPlayer;
 /* 绑定服务的实现流程：
 * 1.服务 onCreate， onBind， onDestroy 方法
 * 2.onBind 方法需要返回一个 IBinder 对象
 * 3.如果 Activity 绑定，Activity 就可以取到 IBinder 对象，可以直接调用对象的方法
 */
 // 相同应用内部不同组件绑定，可以使用内部类以及Binder对象来返回。
 public class MusicController extends Binder {
 public void play() {
  mPlayer.start();//开启音乐
 }
 public void pause() {
  mPlayer.pause();//暂停音乐
 }
 public long getMusicDuration() {
  return mPlayer.getDuration();//获取文件的总长度
 }
 public long getPosition() {
  return mPlayer.getCurrentPosition();//获取当前播放进度
 }
 public void setPosition (int position) {
  mPlayer.seekTo(position);//重新设定播放进度
 }
 }
 /**
 * 当绑定服务的时候，自动回调这个方法
 * 返回的对象可以直接操作Service内部的内容
 * @param intent
 * @return
 */
 @Override
 public IBinder onBind(Intent intent) {
 return new MusicController();
 }
 @Override
 public void onCreate() {
 super.onCreate();
 mPlayer = MediaPlayer.create(this, R.raw.yinyue1);
 }
 /**
 * 任意一次unbindService()方法，都会触发这个方法
 * 用于释放一些绑定时使用的资源
 * @param intent
 * @return
 */
 @Override
 public boolean onUnbind(Intent intent) {
 return super.onUnbind(intent);
 }
 @Override
 public void onDestroy() {
 if (mPlayer.isPlaying()) {
  mPlayer.stop();
 }
 mPlayer.release();
 mPlayer = null;
 super.onDestroy();
 }
}