现在给大家实现的是利用手机内存卡里的音频文件去播放的,至于xml布局文件大家可以去看我上一篇博客的,因为这两篇博客是相关联的。现在就开始吧!
activity--java代码:
xml配置文件权限:(一定要加上)
- <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
activity--java代码:
- package com.zking.laci.android27_playmusic;
- 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.util.Log;
- import android.view.View;
- import android.widget.ImageButton;
- import android.widget.SeekBar;
- import java.io.IOException;
- public class MainActivity extends AppCompatActivity {
- private MediaPlayer mediaPlayer;
- private SeekBar sb_main_play;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- sb_main_play = (SeekBar) findViewById(R.id.sb_main_play);
- sb_main_play.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) {
- //获取当前进度条位置
- int currentPosition=seekBar.getProgress();
- //跳转到某个位置播放
- mediaPlayer.seekTo(currentPosition);
- }
- });
- }
- public void playOrPause(View view){
- ImageButton ib= (ImageButton) view;
- if(mediaPlayer==null){//如果没有歌
- //mediaPlayer = MediaPlayer.create(this, R.raw.a);
- if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
- String sdPath=Environment.getExternalStorageDirectory().getAbsolutePath();
- mediaPlayer=new MediaPlayer();
- //设置 mediaPlayer音频流的类型
- mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
- try {
- //设置音源
- mediaPlayer.setDataSource(this, Uri.parse("file://"+sdPath+"/s1.mp3"));
- //准备(播放内存卡的时候需要准备)
- mediaPlayer.prepare();
- } catch (IOException e) {
- e.printStackTrace();
- }
- mediaPlayer.start();
- ib.setImageResource(android.R.drawable.ic_media_pause);
- //获得音乐的播放时间
- int time=mediaPlayer.getDuration();
- //设置最大值为音乐播放的时间
- sb_main_play.setMax(time);
- new MyThread().start();
- }
- }else if(mediaPlayer.isPlaying()){//如果正在播放
- //暂停
- mediaPlayer.pause();
- //开始图标
- ib.setImageResource(android.R.drawable.ic_media_play);
- }else {
- //开始播放
- mediaPlayer.start();
- //暂停图标
- ib.setImageResource(android.R.drawable.ic_media_pause);
- }
- }
- class MyThread extends Thread{
- @Override
- public void run() {
- super.run();
- while(sb_main_play.getProgress()<sb_main_play.getMax()){
- //获得音乐当前的播放位置
- int currentPosition=mediaPlayer.getCurrentPosition();
- sb_main_play.setProgress(currentPosition);
- }
- }
- }
- }