简易版的Media音乐播放器

1.首先给大家来张思维导图，熟悉一下播放器需要用哪些方法。

2.现在给大家演示一下代码：

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"
    >
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/seekBar_main"
        />
    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@android:drawable/ic_media_play"
        android:onClick="playOrPause"
        />


</LinearLayout>

activity

package com.example.my_android_mediaplayer27;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private SeekBar seekBar;
    private ImageButton imageButton;
    private MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seekBar = (SeekBar) findViewById(R.id.seekBar_main);

        //给进度条设置滑动监听
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                //获取当前进度条的位置
                int currentPosition=seekBar.getProgress();
                //跳转的某个位置进行播放
                mediaPlayer.seekTo(currentPosition);
            }
        });
    }
    public  void playOrPause(View view){
        imageButton = (ImageButton) view;
        if (mediaPlayer==null){
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                String sdPath=Environment.getExternalStorageDirectory().getAbsolutePath();
                mediaPlayer=new MediaPlayer();
                //设置音频流的类型
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
               //设置音源
                try {
                    //本地
//                    mediaPlayer.setDataSource(this, Uri.parse("fill://"+sdPath+"zhuandong.mp3"));
                    //网络
                    mediaPlayer.setDataSource(this, Uri.parse("http://192.168.43.238:8080/zhuandong.mp3"));
                    mediaPlayer.prepareAsync();

//                    mediaPlayer.prepare();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                //设置准备的监听
                mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                    @Override
                    public void onPrepared(MediaPlayer mediaPlayer) {
                        mediaPlayer.start();
                        //暂停图标
                        imageButton.setImageResource(android.R.drawable.ic_media_pause);

                        //获取音乐播放时间
                        int time=mediaPlayer.getDuration();
                        //设置进度条的最大值为音乐的播放时间
                        seekBar.setMax(time);
                        new MyThread().start();
                    }
                });
            }
            //实例化MediaPlayer
//            mediaPlayer = MediaPlayer.create(this, R.raw.zhuandong);
        }else if(mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            //播放图标
            imageButton.setImageResource(android.R.drawable.ic_media_play);
        }else{
            mediaPlayer.start();
            //暂停图标
            imageButton.setImageResource(android.R.drawable.ic_media_pause);
        }


    }

    class MyThread extends  Thread{
        @Override
        public void run() {
            super.run();
            while (seekBar.getProgress()<seekBar.getMax()){
                //获取音乐当前播放位置
                int CurrentPosition=mediaPlayer.getCurrentPosition();
                seekBar.setProgress(CurrentPosition);
            }
        }
    }
}
配置xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.my_android_mediaplayer27">

    <!--手机内存权限-->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
    <!--网络权限-->
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <application android:allowBackup="true" android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true" android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
到这就算结束了。有什么不懂或者问题或建议，可以进行留言或评论，谢谢。