Android程序设计之音乐播放器实现

Android毕设音乐播放器实现

基于MediaPlayer技术实现在线音乐播放器，播放在线音乐，后端使用SpringBoot将音乐存放在Tomcat服务器。app通过网络请求获取音乐，从而实现在线音乐播放。该项目分为用户端和管理员端

一、核心技术Service组件介绍

Service它可以在后台执行长时间运行操作而没有用户界面的应用组件，不依赖任何用户界面，例如后台播放音乐，后台下载文件等。

虽然服务是在后台运行的，但是Service和Activity都是运行在当前APP所在的main thread（UI主线程）中的，而耗时操作（如网络请求、拷贝数据、大文件）会阻塞主线程，给用户带来不好的体验。如果需要在服务中进行耗时操作，可以选择 IntentService，IntentService是Service的子类，用来处理异步请求。

二、如何使用SerVice

创建Service直接在Android Studio中右键选择Service创建即可。默认我们所创建的Service是继承Service的。同时我们为了实现后台音乐播放的功能，所以我们还要实MediaPlayer.OnCompletionListener的接口。

同时还要在AndroidManifest.xml文件中对已经创建的Service进行注册，这一点Android Studio已经帮我们自动创建好了

三、Service启动的两种方式

（1）在Acitivity界面通过显式意图（或隐式意图）的方式来启动服务和关闭服务。

Intent intentService = new Intent(MainActivity.this, AudioService.class);
 startService(intentService);

（2）bindService()绑定服务

当应用组件通过调用 bindService() 绑定到服务时，服务即处于“绑定”状态。绑定服务提供了一个客户端-服务器接口，允许组件与服务进行交互、发送请求、获取结果。 仅当与另一个应用组件绑定时，绑定服务才会运行。 多个组件可以同时绑定到该服务，但全部取消绑定后，该服务即会被销毁。

1. 用户端功能模块：登录，注册，音乐推荐，音乐分类，个人中心，音乐浏览记录，我的下载，上一曲，下一曲，音乐下载

2.管理员模块：登录，注册，用户管理，音乐分类管理（添加分类，删除分类，编辑分类），音乐管理（修改歌名，移动音乐分类，删除音乐）

3.部分核心代码实现

欢迎页

/**
 * 欢迎页
 */
@SuppressLint("CustomSplashScreen")
public class SplashActivity extends BaseActivity<ActivitySplashBinding> {

    @Override
    protected ActivitySplashBinding getViewBinding() {
        return ActivitySplashBinding.inflate(getLayoutInflater());
    }

    @Override
    protected void setListener() {


    }

    @Override
    protected void initData() {
        new Handler(Looper.myLooper()).postDelayed(new Runnable() {
            @Override
            public void run() {
                startActivity(new Intent(mContext,LoginActivity.class));
                finish();
            }
        },800);

    }
}

用户主页面

/**
 * 用户主页面
 */
public class MainActivity extends BaseActivity<ActivityMainBinding> {
    private String[] titles = {"音乐推荐", "音乐分类"};
    private List<Fragment> fragmentList = new ArrayList<>();

    @Override
    protected ActivityMainBinding getViewBinding() {
        return ActivityMainBinding.inflate(getLayoutInflater());
    }

    @Override
    protected void setListener() {

        mBinding.avatar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivityForResult(new Intent(MainActivity.this, MineActivity.class), 20002);
            }
        });

    }


    @Override
    protected void initData() {
        if (ApiConstants.getUserInfo() != null) {
            mBinding.username.setText(ApiConstants.getUserInfo().getUsername());
        }
        //造数据
        fragmentList.add(new HomeFragment());
        fragmentList.add(new TypeFragment());
//        fragmentList.add(new RecordFragment());

        //如果处理成懒加载的话，其实很简单，只要是这个方法setOffscreenPageLimit不去设置，就可以了。
//        mBinding.viewPager.setOffscreenPageLimit(fragmentList.size());
        mBinding.viewPager.setUserInputEnabled(false);
        mBinding.viewPager.setAdapter(new FragmentStateAdapter(this) {
            @NonNull
            @Override
            public Fragment createFragment(int position) {
                return fragmentList.get(position);
            }

            @Override
            public int getItemCount() {
                return fragmentList.size();
            }
        });
        mBinding.tabs.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                mBinding.viewPager.setCurrentItem(tab.getPosition(), false);
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

        TabLayoutMediator tabLayoutMediator = new TabLayoutMediator(mBinding.tabs, mBinding.viewPager, new TabLayoutMediator.TabConfigurationStrategy() {
            @Override
            public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                tab.setText(titles[position]);
            }
        });
        //这句话很重要
        tabLayoutMediator.attach();

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == 20002) {
            finish();
        }
    }
}

音乐播放界面

/**
 * 音乐播放界面
 */
public class PlayMusicActivity extends BaseActivity<ActivityPlayMusicBinding> implements OnPlayerEventListener {
    private static final String TAG = "============";
    private MusicInfo musicInfo;
    private int mLastProgress;

    @Override
    protected ActivityPlayMusicBinding getViewBinding() {
        return ActivityPlayMusicBinding.inflate(getLayoutInflater());
    }

    @Override
    protected void setListener() {

        Aria.download(this).register();

        mBinding.sbProgress.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
                if (Math.abs(progress - mLastProgress) >= DateUtils.SECOND_IN_MILLIS) {
                    mBinding.tvCurrentTime.setText(formatTime("mm:ss", progress));
                    mLastProgress = progress;
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                if (AudioPlayer.get().isPlaying() || AudioPlayer.get().isPausing()) {
                    int progress = seekBar.getProgress();
                    AudioPlayer.get().seekTo(progress);
                } else {
                    seekBar.setProgress(0);
                }
            }
        });

        mBinding.ivMusicPlay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AudioPlayer.get().playPause();
            }
        });

        mBinding.ivMusicPrevious.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AudioPlayer.get().prev();
            }
        });

        mBinding.ivMusicNext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AudioPlayer.get().next();
            }
        });


        //下载
        mBinding.download.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (XXPermissions.isGranted(mContext, Permission.Group.STORAGE)) {
                    download();
                } else {
                    checkPermission();
                }

            }
        });

    }

    @Override
    protected void initData() {
        initSystemBar();
        musicInfo = (MusicInfo) getIntent().getSerializableExtra("musicInfo");
        //监听
        AudioPlayer.get().addOnPlayEventListener(this);
        if (null != musicInfo) {
            AudioPlayer.get().addAndPlay(musicInfo);
            //添加到浏览记录
            addRecord(musicInfo);

            //获取单个任务实体
            DownloadEntity entity = Aria.download(this).getFirstDownloadEntity(musicInfo.getMusic_url());
            if (null != entity) {
                mBinding.download.setClickable(false);
                mBinding.download.setImageResource(R.mipmap.ic_download_complete);
            } else {
                mBinding.download.setClickable(true);
                mBinding.download.setImageResource(R.mipmap.iv_download);
            }
        }
    }

    /**
     * 沉浸式状态栏
     */
    private void initSystemBar() {
        ImmersionBar.with(this).init();
    }

    public String formatTime(String pattern, long milli) {
        int m = (int) (milli / DateUtils.MINUTE_IN_MILLIS);
        int s = (int) ((milli / DateUtils.SECOND_IN_MILLIS) % 60);
        String mm = String.format(Locale.getDefault(), "%02d", m);
        String ss = String.format(Locale.getDefault(), "%02d", s);
        return pattern.replace("mm", mm).replace("ss", ss);
    }

    @SuppressLint("SetTextI18n")
    private void onChangeImpl(MusicInfo music) {
        if (music == null) {
            return;
        }
        mBinding.sbProgress.setProgress((int) AudioPlayer.get().getAudioPosition());
        mBinding.sbProgress.setSecondaryProgress(0);
        mLastProgress = 0;
        mBinding.tvCurrentTime.setText("00:00");
        if (AudioPlayer.get().isPlaying() || AudioPlayer.get().isPreparing()) {
            mBinding.ivMusicPlay.setSelected(true);
        } else {
            mBinding.ivMusicPlay.setSelected(false);
        }
        mBinding.toolbar.setTitle(music.getMusic_title());
        mBinding.tvMusicTitle.setText(music.getMusic_title());
        mBinding.tvMusicSongType.setText(music.getMusic_type());

        startAnim();
    }

    @Override
    public void onChange(MusicInfo music) {
        onChangeImpl(music);
    }

    @Override
    public void onPlayerStart(long duration) {
        //一定要设置最大值
        mBinding.sbProgress.setMax((int) duration);
        mBinding.tvTotalTime.setText(formatTime("mm:ss", duration));
        mBinding.ivMusicPlay.setSelected(true);
        startAnim();
    }

    @Override
    public void onPlayerPause() {
        mBinding.ivMusicPlay.setSelected(false);
        stopAnim();
    }

    @Override
    public void onPublish(int progress) {
        mBinding.sbProgress.setProgress(progress);
    }

    @Override
    public void onBufferingUpdate(int percent) {
        mBinding.sbProgress.setSecondaryProgress(mBinding.sbProgress.getMax() * 100 / percent);
    }


    private Animation animation;

    private void startAnim() {
        animation = AnimationUtils.loadAnimation(this, R.anim.rotation_animation);
        LinearInterpolator lin = new LinearInterpolator();//设置动画匀速运动
        animation.setInterpolator(lin);
        mBinding.imgCd.startAnimation(animation);
    }

    private void stopAnim() {
        if (mBinding.imgCd.getAnimation() != null) {
            mBinding.imgCd.clearAnimation();
        }
    }

    private void addRecord(MusicInfo musicInfo) {
        OkGo.<String>get(ApiConstants.ADD_RECORD_MUSIC_URL)
                .params("username", ApiConstants.getUserInfo().getUsername())
                .params("music_title", musicInfo.getMusic_title())
                .params("music_url", musicInfo.getMusic_url())
                .params("music_type", musicInfo.getMusic_type())
                .execute(new HttpStringCallback(null) {
                    @Override
                    protected void onSuccess(String msg, String response) {

                    }

                    @Override
                    protected void onError(String response) {

                    }
                });


    }

    private void checkPermission() {
        XXPermissions.with(this)
                // 申请单个权限
                // 申请多个权限
                .permission(Permission.Group.STORAGE)
                // 设置权限请求拦截器（局部设置）
                //.interceptor(new PermissionInterceptor())
                // 设置不触发错误检测机制（局部设置）
                //.unchecked()
                .request(new OnPermissionCallback() {

                    @Override
                    public void onGranted(List<String> permissions, boolean all) {
                        if (!all) {
                            showToast("获取部分权限成功，但部分权限未正常授予");
                            return;
                        }

                        //这里做操作


                    }

                    @Override
                    public void onDenied(List<String> permissions, boolean never) {
                        if (never) {
                            showToast("被永久拒绝授权，请手动授予录音和日历权限");
                            // 如果是被永久拒绝就跳转到应用权限系统设置页面
                            XXPermissions.startPermissionActivity(mContext, permissions);
                        } else {
                            showToast("获取录音和日历权限失败");
                        }
                    }
                });
    }

    @Download.onWait
    public void onWait(DownloadTask task) {
        Log.d(TAG, "onWait: ");
    }

    @Download.onPre
    public void onPre(DownloadTask task) {
        Log.d(TAG, "onPre: ");
    }

    @Download.onTaskStart
    public void onTaskStart(DownloadTask task) {
        Log.d(TAG, "onTaskStart: ");
        showToast("开始下载~~~~~");
    }

    @Download.onTaskRunning
    public void onTaskRunning(DownloadTask task) {
        Log.d(TAG, "onTaskRunning: ");
    }

    @Download.onTaskResume
    public void onTaskResume(DownloadTask task) {
        Log.d(TAG, "onTaskResume: ");
    }

    @Download.onTaskStop
    public void onTaskStop(DownloadTask task) {
        Log.d(TAG, "onTaskStop: ");
    }

    @Download.onTaskCancel
    public void onTaskCancel(DownloadTask task) {
        Log.d(TAG, "onTaskCancel: ");
    }

    @Download.onTaskFail
    public void onTaskFail(DownloadTask task, Exception e) {
        Log.d(TAG, "onTaskFail: ");
    }

    @Download.onTaskComplete
    public void onTaskComplete(DownloadTask task) {
        Log.d(TAG, "onTaskComplete: ");
        mBinding.download.setClickable(false);
        mBinding.download.setImageResource(R.mipmap.ic_download_complete);
        showToast("下载完成~~~~~");

    }

    private void download() {
        if (null != musicInfo) {
            Aria.download(PlayMusicActivity.this)
                    .load(musicInfo.getMusic_url()) // 下载地址
                    .setFilePath(getExternalCacheDir().getPath() + musicInfo.getMusic_title() + ".mp3") // 设置文件保存路径
                    .setExtendField(GsonUtils.toJson(musicInfo))
                    .create();

        }
    }

}

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