Question

package com.example.hhh.Test;

import java.io.File;
import java.io.FilenameFilter;  
import java.io.IOException;
import java.util.ArrayList; 
import java.util.List;
import android.app.ListActivity;  
import android.media.MediaPlayer;
import android.os.Bundle;  
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter;
import android.widget.ListView; 

class Mp3Filter implements FilenameFilter {
    public boolean accept(File dir, String name) {
            return (name.endsWith(".mp3"));
    } 
}

public class MainActivity extends ListActivity {

    String SD_PATH = new String("/sdcard/");
    List<String> songs = new ArrayList<String>();
     MediaPlayer mp = new MediaPlayer();
    ListView list;
    File home = new File(SD_PATH);
     ArrayAdapter<String> songList;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

        updateSongList();

             list = (ListView) findViewById(R.id.listView);
             list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                 @Override
                 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                     try {
                         mp.reset();
                         mp.setDataSource(SD_PATH + songs.get(position));
                         mp.prepare();
                         mp.start();
                     }
                     catch (IOException e) {
                         e.printStackTrace();
                     }

                 }
             });
         }


     private void updateSongList() {
         File home = new File(SD_PATH);
         if (home.listFiles(new Mp3Filter()).length > 0) {
             for (File file : home.listFiles(new Mp3Filter())) {
                 songs.add(file.getName());
             }
             songList = (ArrayAdapter<String>) songs;
             setListAdapter(songList);

         }
    } 
}

Answer 1

使用以下代码

package com.materialexample;

import android.app.ListActivity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

class Mp3Filter implements FilenameFilter {
    public boolean accept(File dir, String name) {
        return (name.endsWith(".mp3"));
    }
}

public class PlayerActivity extends ListActivity {

    String SD_PATH = new String("/sdcard/");
    List<String> songs = new ArrayList<String>();
    MediaPlayer mp = new MediaPlayer();
    ListView listViewssss;
    File home = new File(SD_PATH);
    ArrayAdapter<String> songList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /*setContentView(R.layout.activity_player);*/
        listViewssss = getListView();
        updateSongList();
        listViewssss.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                try {
                    mp.reset();
                    mp.setDataSource(SD_PATH + songs.get(position));
                    mp.prepare();
                    mp.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });
    }

    private void updateSongList() {
        File home = new File(SD_PATH);
        if (home.listFiles(new Mp3Filter()).length > 0) {
            for (File file : home.listFiles(new Mp3Filter())) {
                songs.add(file.getName());
            }

            songList = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, songs);
            setListAdapter(songList);
        }
    }
}

不要错过更改您的活动名称。

适用于Android的简单MP3播放器 - 始终崩溃 - 代码就在这里

1 个答案: