读取SD卡中所有MP3文件_移动开发_编程开发_程序员俱乐部

想做一个音乐播放器，首先当然要有播放列表啊，通过查资料，暂时先做了个获取SD卡里所有MP3文件名称的小Demo，效果图如下：

 

 

1.资源管理器预览，主要是1个Activity和2个布局文件：

 

2.然后就是代码了

 

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package com.example.sdtxt;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
    private ListView mListView;
    private ArrayList name;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mListView = (ListView) findViewById(R.id.mListView);
        name = new ArrayList();
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            File path = Environment.getExternalStorageDirectory(); // 获得SD卡路径
            File[] files = path.listFiles();// 读取
            getFileName(files);
        }

        SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, name,
                R.layout.sd_list, new String[] { "Name" },
                new int[] { R.id.tc_fileName });
        mListView.setAdapter(adapter);
    }

    private void getFileName(File[] files) {
        if (files != null)// 先判断目录是否为空，否则会报空指针
        {
            for (File file : files) {
                if (file.isDirectory()) {
                    getFileName(file.listFiles());
                } else {
                    String fileName = file.getName();
                    if (fileName.endsWith(".mp3")) {
                        HashMap map = new HashMap();
                        String s = fileName.substring(0,
                                fileName.lastIndexOf("."));
                        map.put("Name", fileName.substring(0,fileName.lastIndexOf(".")));
                        name.add(map);
                    }
                }
            }
        }
    }

}

MainActivity.java

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/mListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/tv_file"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="2"
        android:text="音乐文件：" />

    <TextView
        android:id="@+id/tc_fileName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

</LinearLayout>

sd_list.xml

 

3.最后注意添上权限

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

 

 

源代码下载