作业

activity

package com.example.day_1024_homework;

import android.Manifest;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.TextView;

import com.example.day_1024_homework.bean.Music;
import com.example.day_1024_homework.util.MusicUtils;

import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private ImageView imageList;
    private TextView tvTitleList;
    private SeekBar seekList;
    private Button listList;
    private Button listLeft;
    private Button listStart;
    private Button listRight;
    //设置binder为成员变量
    private MusicService.MusicBinder binder;
    //定义一个值来标记是否正在播放.
    private boolean isPlay = false;
    //定义一个int来记录点击的条目
    private int flag = 0;
    //定义一个计时器
    private Timer timer;

    //定义一个集合作为数据源
    private List<Music> list;
    //配置适配器
    private MyAdapter adapter;

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 110:
                    binder.callPlay(flag);
                    break;
                case 120:
                    binder.callPause();
                    break;
                case 130:
                    binder.callBack();
                    flag--;
                    if (flag < 0) {
                        flag = list.size() - 1;
                    }
                    timerTask();
                    break;
                case 140:
                    binder.callNext();
                    flag++;
                    if (flag > list.size() - 1) {
                        flag = 0;
                    }
                    timerTask();
                    break;
            }
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 100);
        } else {
            list = MusicUtils.getMusic(this);
        }


        //点击播放
        toPlay();
        //点击暂停 / 继续
        pauseOrReStart();
        //点击播放下一曲
        toNext();
        //点击播放上一曲
        toBack();
        //拖动播放
        seekto();
//        错误


    }

    private void seekto() {
        seekList.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (fromUser) {
                    binder.callChange(progress);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }

    private void toBack() {
        listLeft.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                flag--;
                if (flag < 0) {
                    flag = list.size() - 1;
                }
                play(flag);
                binder.callBack();
            }
        });
    }

    private void toNext() {
        listRight.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                flag++;
                if (flag > list.size() - 1) {
                    flag = 0;
                }
                play(flag);
                binder.callNext();
            }
        });
    }

    private void pauseOrReStart() {
        listStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isPlay) {
                    isPlay = false;
                    binder.callReStart();
                    listStart.setBackgroundResource(R.drawable.playbar_btn_pause);
                } else {
                    isPlay = true;
                    binder.callPause();
                    listStart.setBackgroundResource(R.drawable.playbar_btn_play);
                }
            }
        });
    }

    private void toPlay() {
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                isPlay = false;
                flag = position;
                binder.callPlay(position);
                listStart.setBackgroundResource(R.drawable.playbar_btn_pause);

                timerTask();

                play(position);
            }
        });
    }

    private void timerTask() {
        if (timer != null) {
            timer.cancel();
        }

        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                seekList.setMax(binder.callGetMax());
                seekList.setProgress(binder.callGetPosition());
            }
        }, 0, 1000);
    }

    private void play(int position) {
        tvTitleList.setText(list.get(position).getTitle());
    }

    private void createAndBind() {
        Intent intent = new Intent(this, MusicService.class);
        startService(intent);


        ServiceConnection connection = new ServiceConnection() {
            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                binder = (MusicService.MusicBinder) service;
            }

            @Override
            public void onServiceDisconnected(ComponentName name) {

            }
        };

        bindService(intent, connection, Service.BIND_AUTO_CREATE);
    }

    private void initView() {
        listView = (ListView) findViewById(R.id.listView);
        imageList = (ImageView) findViewById(R.id.image_list);
        tvTitleList = (TextView) findViewById(R.id.tv_title_list);
        seekList = (SeekBar) findViewById(R.id.seek_list);
        listList = (Button) findViewById(R.id.list_list);
        listLeft = (Button) findViewById(R.id.list_left);
        listStart = (Button) findViewById(R.id.list_start);
        listRight = (Button) findViewById(R.id.list_right);

    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 100 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            list = MusicUtils.getMusic(this);
            listView.setAdapter(new MyAdapter(list, this));

            createAndBind();

        }
    }
}

service

package com.example.day_1024_homework;

import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.widget.RemoteViews;

import com.example.day_1024_homework.bean.Music;
import com.example.day_1024_homework.util.MusicUtils;

import java.io.IOException;
import java.util.List;

public class MusicService extends Service {
    private List<Music> list;
    private MediaPlayer player;
    //定义一个int来记录当前的条目数
    private int index = 0;
    //定义一个值来标记是否正在播放.
    private boolean isPlay = false;

    public MusicService() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
        list = MusicUtils.getMusic(this);
        player = new MediaPlayer();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.layout_notification);
        builder.setCustomContentView(remoteViews);
        //点击播放
        Intent intent1 = new Intent();
        intent1.setAction(MusicUtils.playMusic);
        PendingIntent broadcast = PendingIntent.getBroadcast(this, 110, intent1, PendingIntent.FLAG_UPDATE_CURRENT);
        remoteViews.setOnClickPendingIntent(R.id.list_start1, broadcast);
        //点击暂停
        Intent intent2 = new Intent();
        intent2.setAction(MusicUtils.pauseMusic);
        PendingIntent broadcast1 = PendingIntent.getBroadcast(this, 120, intent2, PendingIntent.FLAG_UPDATE_CURRENT);
        remoteViews.setOnClickPendingIntent(R.id.list_stop1, broadcast1);
        //点击播放上一曲
        Intent intent3 = new Intent();
        intent3.setAction(MusicUtils.backMusic);
        PendingIntent broadcast2 = PendingIntent.getBroadcast(this, 130, intent3, PendingIntent.FLAG_UPDATE_CURRENT);
        remoteViews.setOnClickPendingIntent(R.id.list_left1, broadcast2);
        //点击播放下一曲
        Intent intent4 = new Intent();
        intent4.setAction(MusicUtils.nextMusic);
        PendingIntent broadcast3 = PendingIntent.getBroadcast(this, 140, intent4, PendingIntent.FLAG_UPDATE_CURRENT);
        remoteViews.setOnClickPendingIntent(R.id.list_right1, broadcast3);

        Notification build = builder.build();
        startForeground(10, build);
        return super.onStartCommand(intent, flags, startId);
    }

    public class MusicBinder extends Binder {
        //点击调用
        public void callPlay(int i) {
            paly(i);
        }

        //点击暂停
        public void callPause() {
            pause();
        }

        //点击继续
        public void callReStart() {
            reStart();
        }

        //下一曲
        public void callNext() {
            next();
        }

        //上一曲
        public void callBack() {
            back();
        }

        //实时进度
        public int callGetPosition() {
            return getPosition();
        }

        //设置最大值
        public int callGetMax() {
            return getMax();
        }

        //拖动播放
        public void callChange(int i) {
            getChange(i);
        }

        //错误调用
        public void callMusicError() {
            musicError();
        }

        //一首音乐播放完
        public void callMusicFinlish() {
            getMusicFinlish();
        }

    }


    private void getMusicFinlish() {
        player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                next();
            }
        });
    }

    private void musicError() {
        player.setOnErrorListener(new MediaPlayer.OnErrorListener() {
            @Override
            public boolean onError(MediaPlayer mp, int what, int extra) {
                next();
                return false;
            }
        });
    }

    private void getChange(int i) {
        player.seekTo(i);
    }

    private int getMax() {
        return Integer.parseInt(list.get(index).getDuration());
    }

    private int getPosition() {
        return player.getCurrentPosition();
    }

    private void back() {
        index--;
        if (index < 0) {
            index = list.size() - 1;
        }
        paly(index);
    }

    private void next() {
        index++;
        if (index > list.size() - 1) {
            index = 0;
        }
        paly(index);
    }

    //点击继续
    private void reStart() {
        player.start();
    }

    //点击暂停
    private void pause() {
        player.pause();
    }

    //点击播放
    private void paly(int i) {
        index = i;
        try {
            player.reset();
            player.setDataSource(list.get(i).getData());
            player.prepareAsync();
            player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    player.start();
                }
            });

        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    @Override
    public IBinder onBind(Intent intent) {
        return new MusicBinder();
    }
}