论自作音乐播放器涉及知识点总结

最新推荐文章于 2023-03-30 00:24:57 发布

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最新推荐文章于 2023-03-30 00:24:57 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/nanze/p/5401820.html

本文介绍如何在Android应用中查找并管理手机SD卡下的音乐文件，包括获取音乐列表、播放、暂停、调整播放进度及跳转传参功能。

1.内容提供者查找手机SD卡下的音乐

配置读取SD卡权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

//调用方法
List<Good>  list = GetMusic.Music(MainActivity.this);

package com.bawei.day07_music;

import java.util.ArrayList;

import com.bawei.vo.Good;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.provider.MediaStore.Audio;

public class GetMusic {

public static ArrayList<Good> Music(Context context) {
ContentResolver resolver = context.getContentResolver();
// 内容提供者访问MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
Cursor cursor = resolver.query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
null);
ArrayList<Good> list=new ArrayList<Good>();
while (cursor.moveToNext()) {
// 名字
String name = cursor.getString(cursor
.getColumnIndex(Audio.Media.TITLE));
// 专辑名
String album = cursor.getString(cursor
.getColumnIndexOrThrow(Audio.Media.ALBUM));
// 歌手名
String artist = cursor.getString(cursor
.getColumnIndexOrThrow(Audio.Media.ARTIST));
// URI歌曲文件存放路径
String path = cursor.getString(cursor
.getColumnIndexOrThrow(Audio.Media.DATA));
// 歌曲文件播放时间长度
int duration = cursor.getInt(cursor
.getColumnIndexOrThrow(Audio.Media.DURATION));
// 音乐文件大小
int size = cursor.getInt(cursor
.getColumnIndexOrThrow(Audio.Media.SIZE));
//保存到集合
list.add(new Good(name,artist,path,false));
}
return list;
}
}

2.播放音乐

//播放音乐
private void startMusic(int arg0) {
//让上一首停下
if (player != null && player.isPlaying()) {
player.stop();
player.reset();
player = null;

}

try {
//播放器
player = new MediaPlayer();
//播放路径
player.setDataSource(list.get(arg0).getMusic());
//准备
player.prepare();
//播放
player.start();
//得到歌曲总进度
c = player.getDuration();
//给进度条seekbar设置最大值
seekBar.setMax(c);
//timer
time();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

//timer
private void time() {
// TODO Auto-generated method stub
//timer
timer = new Timer();
//播放进度100毫秒前进一下
timer.schedule(new TimerTask() {

private int d;

@Override
public void run() {
// TODO Auto-generated method stub
//得到当前播放进度
d = player.getCurrentPosition();
//赋给seekbar
seekBar.setProgress(d);
//handler传值显示时间
Message message = Message.obtain();
message.arg1 = c;
message.arg2 = d;
handler.sendMessage(message);

}
}, 0, 100);
}

//显示时间 Handler handler = new Handler() { public void handleMessage(Message msg) { //当前进度 int cu1 = msg.arg1; //总长度 int cu2 = msg.arg2; //转换成时间格式 SimpleDateFormat sim = new SimpleDateFormat("mm:ss"); String cur1 = sim.format(cu1); String cur2 = sim.format(cu2); //赋给textview text1.setText(cur2); text2.setText(cur1); }; };

3.暂停继续播放

if (player != null) { //音乐暂停 player.pause(); //得到当前seekBar进度 m = seekBar.getProgress(); } //继续播放 player.seekTo(m);

4.seekbar调整音乐播放进度

//seekbar调整音乐播放进度
seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
if (player != null) {
//得到当前拖拽的进度
player.seekTo(seekBar.getProgress());
//timer
timecan();
//timer计时
time();

}
}

public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
//清空timer
timecan();
}

public void onProgressChanged(SeekBar seekBar,
int progress, boolean fromUser) {
// TODO Auto-generated method stub

}
});

////清空timer private void timecan() { // TODO Auto-generated method stub if (timer != null) { timer.cancel(); } }

5.Intent跳转传list集合

先把List<>改为ArrayList<>

ArrayList<Good> list=new ArrayList<Good>();

Intent intent = new Intent(MainActivity.this,InfoActivity.class);
  intent.putExtra("list", list);               
startActivity(intent);

Intent intent = getIntent();

ArrayList<Good> list= (ArrayList<Good>) intent.getSerializableExtra("list");

转载于:https://www.cnblogs.com/nanze/p/5401820.html