安卓 多媒体音乐播放器

今天给大家分享一下音频播放器，其代码如下：

xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.an_playmusic.MainActivity">


    <SeekBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/seekBar"
        android:layout_weight="1"
        />

<ImageButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@android:drawable/ic_media_play"
     android:onClick="isplayorpause"
    />

</LinearLayout>

activity:

package com.example.an_playmusic;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
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 MediaPlayer mediaPlayer;

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

        //根据音乐的进度 拖动
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
        //获取拖动后的进度

            int progress=seekBar.getProgress();
            mediaPlayer.seekTo(progress);
                Log.i("test","调用了吗");

            }
        });
    }


    public  void isplayorpause(View view) throws IOException {
        ImageButton imageButton= (ImageButton) view;

        //判断是否在播放
        if (mediaPlayer==null){
            //实例化  播放应用内的音频文件
           // mediaPlayer = MediaPlayer.create(this, R.raw.tf);

     //实例化
            mediaPlayer=new MediaPlayer();

            //播放内存卡的音频文件
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

            //设置音源
            mediaPlayer.setDataSource(this, Uri.parse("file://mnt/sdcard/Music/love.mp3"));

             //准备
            mediaPlayer.prepare();

            //开始
            mediaPlayer.start();
            new mythread().start();
            imageButton.setImageResource(android.R.drawable.ic_media_pause);
            //获取音乐的时长
            int   duration=mediaPlayer.getDuration();
           //设置进度条的最大值与音乐时长相等
            seekBar.setMax(duration);

        }else if (mediaPlayer.isPlaying()){
            mediaPlayer.pause();
        }else {
            //继续开始 从暂停的位置开始
            mediaPlayer.start();
            imageButton.setImageResource(android.R.drawable.ic_media_pause);
        }
    }
    class  mythread extends Thread{
        @Override
        public void run() {
            super.run();
            //拿到进度条的当前进度
            while (seekBar.getProgress()<=seekBar.getMax()){
                //获取音乐播放的当前位置
                int   currentPosition=mediaPlayer.getCurrentPosition();
                seekBar.setProgress( currentPosition);

            }
        }
    }
}

如果你读取的是内存卡的数据，就需加读取内存卡的权限：

 <!--读取内存卡的全权限-->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />