Java 如何从原始文件夹而不是SD卡加载mp3文件
您好,我正在看这个教程:但是它有一些bug,看起来不正常 我只是想知道,如何从原始文件夹而不是SD卡本地加载MP3文件,如下面的代码所示。谢谢Java 如何从原始文件夹而不是SD卡加载mp3文件,java,android,arraylist,mp3,media-player,Java,Android,Arraylist,Mp3,Media Player,您好,我正在看这个教程:但是它有一些bug,看起来不正常 我只是想知道,如何从原始文件夹而不是SD卡本地加载MP3文件,如下面的代码所示。谢谢 public class SongsManager { // SDCard Path final String MEDIA_PATH = new String("/sdcard/"); private ArrayList<HashMap<String, String>> songsList = new Ar
public class SongsManager {
// SDCard Path
final String MEDIA_PATH = new String("/sdcard/");
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
// Constructor
public SongsManager(){
}
/**
* Function to read all mp3 files from sdcard
* and store the details in ArrayList
* */
public ArrayList<HashMap<String, String>> getPlayList(){
File home = new File(MEDIA_PATH);
if (home.listFiles(new FileExtensionFilter()).length > 0) {
for (File file : home.listFiles(new FileExtensionFilter())) {
HashMap<String, String> song = new HashMap<String, String>();
song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
song.put("songPath", file.getPath());
// Adding each song to SongList
songsList.add(song);
}
}
// return songs list array
return songsList;
}
/**
* Class to filter files which are having .mp3 extension
* */
class FileExtensionFilter implements FilenameFilter {
public boolean accept(File dir, String name) {
return (name.endsWith(".mp3") || name.endsWith(".MP3"));
}
}
}
公共类歌曲管理器{
//SD卡路径
最终字符串媒体路径=新字符串(“/sdcard/”);
private ArrayList songsList=new ArrayList();
//建造师
公共歌曲管理器(){
}
/**
*从SD卡读取所有mp3文件的功能
*并将详细信息存储在ArrayList中
* */
公共阵列列表getPlayList(){
文件主目录=新文件(媒体路径);
if(home.listFiles(新文件扩展筛选器()).length>0){
对于(文件:home.listFiles(新的FileExtensionFilter())){
HashMap宋=新HashMap();
song.put(“songTitle”,file.getName().substring(0,(file.getName().length()-4));
put(“songPath”,file.getPath());
//将每首歌曲添加到歌曲列表
歌曲列表。添加(歌曲);
}
}
//返回歌曲列表数组
返回歌曲列表;
}
/**
*类来筛选扩展名为.mp3的文件
* */
类FileExtensionFilter实现FilenameFilter{
公共布尔接受(文件目录,字符串名称){
return(name.endsWith(“.mp3”)| name.endsWith(“.mp3”);
}
}
}
在媒体播放类中使用raw
资源ID,如MediaPlayer
。因此,例如,如果您有res/raw/resources\u not\u file.mp3
,您将使用R.raw.resources\u not\u files
引用该mp3,以获得类似的方法。将mp3文件放在raw文件夹中,并以这种方式使用
MediaPlayer mplayer;
mplayer= MediaPlayer.create(this, R.raw.yoursound);// create & refer the id
mplayer.start();//will play the file
有关更多详细信息,请按要求查看此链接
>如何从原始文件夹而不是SD卡本地加载我的MP3文件
Ans是:
MediaPlayer mplayer;
mplayer= MediaPlayer.create(this, R.raw.soundfile);// it is the file that you save in ur raw folder
mplayer.start();
如果您想要完整的示例
您可以尝试以下代码:
package com.hrupin.mp3player;
import com.hrupin.mp3player.R;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.SeekBar;
public class Mp3player extends Activity {
private Button buttonPlayStop;
private MediaPlayer mediaPlayer;
private SeekBar seekBar;
private final Handler handler = new Handler();
// Here i override onCreate method.
//
// setContentView() method set the layout that you will see then
// the application will starts
//
// initViews() method i create to init views components.
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
initViews();
}
// This method set the setOnClickListener and method for it (buttonClick())
private void initViews() {
buttonPlayStop = (Button) findViewById(R.id.ButtonPlayStop);
buttonPlayStop.setOnClickListener(new OnClickListener() {@Override public void onClick(View v) {buttonClick();}});
mediaPlayer = MediaPlayer.create(this, R.raw.testsong_20_sec);
seekBar = (SeekBar) findViewById(R.id.SeekBar01);
seekBar.setMax(mediaPlayer.getDuration());
seekBar.setOnTouchListener(new OnTouchListener() {@Override public boolean onTouch(View v, MotionEvent event) {
seekChange(v);
return false; }
});
}
public void startPlayProgressUpdater() {
seekBar.setProgress(mediaPlayer.getCurrentPosition());
if (mediaPlayer.isPlaying()) {
Runnable notification = new Runnable() {
public void run() {
startPlayProgressUpdater();
}
};
handler.postDelayed(notification,1000);
}else{
mediaPlayer.pause();
buttonPlayStop.setText(getString(R.string.play_str));
seekBar.setProgress(0);
}
}
// This is event handler thumb moving event
private void seekChange(View v){
if(mediaPlayer.isPlaying()){
SeekBar sb = (SeekBar)v;
mediaPlayer.seekTo(sb.getProgress());
}
}
// This is event handler for buttonClick event
private void buttonClick(){
if (buttonPlayStop.getText() == getString(R.string.play_str)) {
buttonPlayStop.setText(getString(R.string.pause_str));
try{
mediaPlayer.start();
startPlayProgressUpdater();
}catch (IllegalStateException e) {
mediaPlayer.pause();
}
}else {
buttonPlayStop.setText(getString(R.string.play_str));
mediaPlayer.pause();
}
}
希望这有助于……:)一个疑问。。如果我们在原始文件夹中加载.mp3文件,该文件将反映在.apk大小中。@S3a2r0a8v9a6n9a:是的,打包在apk中的mp3文件将增加apk的大小。由于MP3已经是压缩格式,APK大小将增加大约MP3文件本身的大小。因此,这种技术主要适用于短音效等,而不是数小时的音乐。