Android中如何开发简易音乐播放器

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#696969"> <LinearLayout android:layout_width="match_parent" android:layout_height="60dp" android:layout_marginTop="10dp" android:layout_alignParentTop="true" android:id="@+id/title" android:orientation="horizontal"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="15dp" android:layout_marginBottom="3dp" android:text="生僻字" android:textSize="25dp" android:gravity="center" android:textColor="#ffffff"/> </LinearLayout> <TextView android:layout_width="match_parent" android:layout_height="0.5dp" android:background="#afafaf" android:layout_below="@+id/title"/> <ImageView android:id="@+id/disc" android:layout_width="280dp" android:layout_height="280dp" android:layout_centerHorizontal="true" android:layout_below="@+id/title" android:layout_marginTop="50dp" android:src="@drawable/xcvb" /> <ImageView android:id="@+id/needle" android:layout_width="120dp" android:layout_height="120dp" android:layout_below="@+id/title" android:layout_marginLeft="150dp"/> <RelativeLayout android:id="@+id/music1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@+id/rl" android:layout_marginTop="20dp" android:layout_marginBottom="10dp" android:gravity="center"> <SeekBar android:id="@+id/music_seek_bar" android:layout_width="240dp" android:layout_height="wrap_content"/> <TextSwitcher android:id="@+id/text_switcher" android:layout_width="80dp" android:layout_height="50dp" android:layout_toRightOf="@+id/music_seek_bar"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="00:00/2:00" android:textColor="@color/colorAccent"/> </TextSwitcher> </RelativeLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="70dp" android:gravity="center" android:id="@+id/rl" android:layout_marginBottom="20dp" android:layout_alignParentBottom="true" android:orientation="horizontal"> <ImageView android:id="@+id/playing_pre" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:src="@drawable/music_previous" /> <ImageView android:id="@+id/playing_play" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:src="@drawable/music_play" /> <ImageView android:id="@+id/playing_next" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:src="@drawable/music_next" /> </LinearLayout></RelativeLayout>

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(); }}

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