1023作业

于 2019-10-23 21:14:32 发布
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本文链接：https://blog.youkuaiyun.com/Wandering_sea/article/details/102711182
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@[toc] 作业

音乐播放器

activity

package com.example.day1023_exe02;

import android.Manifest;
import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import com.example.day1023_exe02.Bean.Music;
import com.example.day1023_exe02.util.MusicUtils;

import java.io.IOException;
import java.util.List;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;

import static com.example.day1023_exe02.util.MusicUtils.order;
import static com.example.day1023_exe02.util.MusicUtils.single;


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;

    //定义一个游标
    private int index = 0;
    //定义一个布尔值来确定是否播放
    private boolean isplay = false;
    //定义一个集合
    private List<Music> list;
    //配置适配器
    private MyAdapter adapter;
    //定义一个播放器
    private MediaPlayer player;
    //定义一个定时器
    private Timer timer;
    //定义一个数来记录点击的条目
    private int num = 0;

    @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);
        }

        player = new MediaPlayer();

        //点击播放
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                play(position);
            }
        });

        //上一曲
        listLeft.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                index--;
                if (index < 0) {
                    index = list.size() - 1;
                }
                play(index);
            }
        });
        //下一曲
        listRight.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                next();
            }
        });

        //点击播放，图标切换
        listStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //如果暂停播放
                if (isplay) {
                    //取反
                    isplay = false;
                    //启动
                    player.start();
                    //图标切换
                    listStart.setBackgroundResource(R.drawable.playbar_btn_pause);
                } else {
                    //取反
                    isplay = true;
                    //暂停
                    player.pause();
                    //图标切换
                    listStart.setBackgroundResource(R.drawable.playbar_btn_play);
                }
            }
        });

        //seekbar  实时跟进
        seekList.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (fromUser) {
                    player.seekTo(progress);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

        //播放结束一首音乐
        player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                next();
            }
        });

        //播放异常时调用
        player.setOnErrorListener(new MediaPlayer.OnErrorListener() {
            @Override
            public boolean onError(MediaPlayer mp, int what, int extra) {
                next();
                return false;
            }
        });

        //播放模式
        listList.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PopupWindow window = new PopupWindow();
                View inflate = LayoutInflater.from(MainActivity.this).inflate(R.layout.window, null);

                window.setContentView(inflate);
                window.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
                window.setWidth(300);
                window.setOutsideTouchable(true);

                window.showAsDropDown(tvTitleList, 0, -370);

                //弹窗里的三个条目的点击事件
                TextView textView_order = inflate.findViewById(R.id.order_play);
                textView_order.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        num = order;
                        Toast.makeText(MainActivity.this, "顺序播放", Toast.LENGTH_SHORT).show();
                    }
                });

                TextView textView_random = inflate.findViewById(R.id.rando_play);
                textView_random.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        num = MusicUtils.random;
                        Toast.makeText(MainActivity.this, "随机播放", Toast.LENGTH_SHORT).show();
                    }
                });

                TextView textView_single = inflate.findViewById(R.id.single_play);
                textView_single.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        num = single;
                        Toast.makeText(MainActivity.this, "单曲循环", Toast.LENGTH_SHORT).show();
                    }
                });


            }
        });


    }

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

    private void play(int position) {

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

        index = position;

        //设置播放模式
        switch (num){
            case 0:

                break;
            case 1:
                  position = new Random().nextInt(list.size());
                break;
            case 2:
                position = --index;
                break;
        }


        try {
            player.reset();
            player.setDataSource(list.get(position).getData());
            player.prepareAsync();
            seekList.setMax(Integer.parseInt(list.get(position).getDuration()));
            timer = new Timer();
            timer.schedule(new TimerTask() {
                @Override
                public void run() {
                    seekList.setProgress(player.getCurrentPosition());
                }
            }, 0, 1000);
            final int finalPosition = position;
            player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    tvTitleList.setText(list.get(finalPosition).getTitle());
                    player.start();
                }
            });
            listStart.setBackgroundResource(R.drawable.playbar_btn_pause);
            isplay = false;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    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));
        }

    }
}

工具类

package com.example.day1023_exe02.util;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.provider.MediaStore;

import com.example.day1023_exe02.Bean.Music;

import java.util.ArrayList;
import java.util.List;

public class MusicUtils {

    public static int order = 0;
    public static int random = 1;
    public static int single = 2;


    public static List<Music> getMusic(Context context){

        List<Music> list = new ArrayList<>();
        ContentResolver resolver = context.getContentResolver();
        Cursor cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
        if(cursor != null){
           while (cursor.moveToNext()){
               String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
               String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
               String duration = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
               String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
               String size = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE));

               int i = Integer.parseInt(duration);

               Music music = new Music(title, artist, duration, data, size);
               if(i > 60*1000){
                   list.add(music);
               }
           }
        }

        cursor.close();


        return list;
    }


}

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ListView
        android:layout_weight="8.5"
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="0dp"></ListView>
    <RelativeLayout
        android:layout_weight="1.5"
        android:layout_width="match_parent"
        android:layout_height="0dp">

        <LinearLayout
            android:background="#FFF"
            android:id="@+id/linear0001"
            android:layout_width="80dp"
            android:orientation="vertical"
            android:layout_height="match_parent">
            <ImageView
                android:id="@+id/image_list"
                android:src="@mipmap/ic_launcher"
                android:layout_width="wrap_content"
                android:layout_height="match_parent" />

        </LinearLayout>

        <LinearLayout
            android:background="#FFF"
            android:id="@+id/linear0002"
            android:orientation="vertical"
            android:layout_toRightOf="@id/linear0001"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <TextView
                android:id="@+id/tv_title_list"
                android:layout_weight="2"
                android:text=""
                android:layout_width="match_parent"
                android:layout_height="0dp" />

            <SeekBar
                android:id="@+id/seek_list"
                android:layout_weight="3"
                android:layout_width="match_parent"
                android:layout_height="0dp" />

            <LinearLayout
                android:background="#FFF"
                android:id="@+id/radio_G"
                android:layout_weight="4"
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_height="0dp">

                <Button
                    android:background="@drawable/playbar_btn_playlist"
                    android:layout_weight="1"
                    android:id="@+id/list_list"
                    android:layout_width="0dp"
                    android:layout_height="match_parent" />


                <Button
                    android:background="@drawable/playbar_btn_prev"
                    android:layout_weight="1"
                    android:id="@+id/list_left"
                    android:layout_width="0dp"
                    android:layout_height="match_parent" />
                <Button
                    android:background="@drawable/playbar_btn_play"
                    android:layout_weight="1"
                    android:id="@+id/list_start"

                    android:layout_width="0dp"
                    android:layout_height="match_parent" />
                <Button
                    android:background="@drawable/playbar_btn_next"
                    android:layout_weight="1"
                    android:id="@+id/list_right"
                    android:layout_width="0dp"
                    android:layout_height="match_parent" />



            </LinearLayout>

        </LinearLayout>



    </RelativeLayout>

</LinearLayout>
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