如何從RAW文件夾而不是SDCARD加載mp3文件

Question

您好，我在網上觀看本教程：但是它存在一些錯誤，並且無法正常運行。

我只是想了解如何從SDCARD插入的RAW文件夾本地加載我的MP3文件，如下面的代碼所示。 謝謝

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"));
        }
    }
}

Answer 1

當您要求

>如何從SDCARD插入的RAW文件夾本地加載我的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

您可以嘗試以下代碼：

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();
        }
    }

希望這可以幫助...：）

Answer 2

在媒體播放類（如MediaPlayer使用raw資源ID。 因此，例如，如果您有res/raw/resources_are_not_files.mp3 ，則可以使用R.raw.resources_are_not_files 在MediaPlayer上為諸如create()類的方法引用該MP3。

Answer 3

將mp3文件放在原始文件夾中，然后使用這種方式

MediaPlayer mplayer;
mplayer= MediaPlayer.create(this, R.raw.yoursound);// create & refer the id
mplayer.start();//will play the file

有關更多詳細信息，請檢查此鏈接http://www.tutorialspoint.com/android/android_mediaplayer.htm