【问题标题】:wait until current media finish playing before it play another in android等到当前媒体完成播放,然后再在 android 中播放另一个
【发布时间】:2014-05-25 14:13:20
【问题描述】:

这是我在 android 中的媒体播放器代码。我的问题是循环播放 zip 文件夹中的所有文件,而无需等待当前播放完成。我该如何解决这个问题。我对 android 做我的第一个项目还是很陌生!需要一些专家的帮助。

//代码

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.commons.io.IOUtils;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.Button;

public class MainActivity extends Activity {
    private Button playButton;
    private MediaPlayer mp;    
    private static final String MAIN_TAG ="ERROR";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
         try {
             super.onCreate(savedInstanceState); 
        //final String file_loc= Environment.getExternalStorageDirectory().toString();
        //Log.i("location",file_loc);
             ZipFile zip = new ZipFile("/storage/emulated/0/AjeshDocument/sample.zip");

             for(int i=1;i<9;i++){

             ZipEntry entry = zip.getEntry("sample/rihanna_"+i+".mp3");                        
             if (entry != null) {
                 InputStream in = zip.getInputStream(entry);
                 // see Note #3.
                 File tempFile = File.createTempFile("_AUDIO_", ".wav");
                 FileOutputStream out = new FileOutputStream(tempFile);
                 IOUtils.copy(in, out);

                 // do something with tempFile (like play it)
                 File f = tempFile;   
                 try {
                     if (f.exists())
                     {
                         Log.i(MAIN_TAG,"Audio file found!");
                         MediaPlayer mp = new MediaPlayer();
                         FileInputStream fis = new FileInputStream(f);
                         mp.setDataSource(fis.getFD());

                      //  if (mp.isPlaying() == false) {                        
                         mp.prepare();
                         //mp.setLooping(false);
                         mp.start();                         
                        // mp.stop();
                         //mp.release();

                         mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                             public void onCompletion(MediaPlayer mp2) {
                                 mp2.release();

                             };
                         });
                      // }  
                         Log.i(MAIN_TAG,"Song finished!");
                     }  


                   else
                     {
                         Log.i(MAIN_TAG,"File doesn't exist!!");
                     }

                 }
                 catch (IOException e)
                 {
                     Log.i(MAIN_TAG,e.toString());
                 }
             }
             else {
                 // no such entry in the zip
             }
            } //for end
            // mp.release();

         }  
             catch (Exception e) {
             // handle your exception cases...

             Log.i(MAIN_TAG,e.toString());

         }       

    }

    @Override
    protected void onResume() {
        Log.w("Info", "App Resume");

        super.onResume();
    }

    @Override
    protected void onStop() {
        Log.w("Info", "App stopped");

        super.onStop();
    }

    @Override
    protected void onDestroy() {
        Log.w("Info", "App destoryed");

        super.onDestroy();

    }

}

【问题讨论】:

    标签: java android android-mediaplayer


    【解决方案1】:

    这是因为您正在为每首歌曲创建一个新的 mp 实例。首先,您应该创建一个 Song 类来保存歌曲信息。或者,您可以创建一个包含歌曲文件路径的字符串列表。然后,您可以执行以下操作:

    int playlistPos = 0;
    
    protected void onCreate(Bundled savedInstanceState) {
        super.onCreate(savedInstanceState);
        initSong(songs.get(playlistPos);
        mp.start();
    
        mp.setOnCompletionListener(new OnCompletionListener() {
            playlistPos++;
            initSong(songs.get(playlistPos);
            mp.start();
        });
    }
    
    private void initSong(Song song) {
        // Set the datasource in here, prepare, etc
    }
    

    一旦每首歌曲播放完毕,它会将播放列表位置移动一个,然后重新启动播放器。

    【讨论】:

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