Android development Local and network MP3 Music Player (18) new download song Loading preparation sdcardsearchtolist

Scan local file to load to item

Not limited to apps to music player, other Android works, can also use Sdcardsearchtolist

Other Android projects can also be used, I have now done a very small demo

Later will post, will be in the player, add this function, to achieve just downloaded music, loaded into the player

This demo source download:
http://download.csdn.net/album/detail/3105
The name is: Sdcardsearchtolist, if not displayed, may not have been audited completed
Not download can also, because only 1 Java files, 2 XML files, very small

Until the current source download:
http://download.csdn.net/album/detail/3105
(Latest, please download the last one, this post corresponds to version 2.1; If you need to step through the process, please download all)

Achieve results

The implementation code is as follows:

Getlistactivity as follows: (main activity)

package com.iwanghang.sdcardsearchtolist;

import android.os.Bundle;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;

/ **
 * Don't forget to add permissions
 * <uses-permission android: name = "android.permission.READ_EXTERNAL_STORAGE"> </ uses-permission>
 * /
public class GetListActivity extends Activity {

    private Button myBtn = null;
    private ListView lv = null;
    private SimpleAdapter sa = null;
    @Override
    public void onCreate (Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        setContentView (R.layout.activity_get_list);

        lv = (ListView) findViewById (R.id.listv);

        String [] from = {"text_content"};
        int [] to = {R.id.myView1};
        sa = new SimpleAdapter (this, getList (), R.layout.itemlist, from, to);


        myBtn = (Button) findViewById (R.id.myButton);
        myBtn.setOnClickListener (new OnClickListener () {

            public void onClick (View arg0) {
                // TODO Auto-generated method stub
                lv.setAdapter (sa);
            }
        });

    }

    public List <Map <String, Object >> getList ()
    {
        List <Map <String, Object >> list = new ArrayList <Map <String, Object >> ();
        String sDStateString = Environment.getExternalStorageState ();
        if (sDStateString.equals (Environment.MEDIA_MOUNTED))
        {
            // File SDFile = Environment.getExternalStorageDirectory ();
            // File sdPath = new File (SDFile.getAbsolutePath ());
            File sdPath = new File (Environment.getExternalStorageDirectory () + "/ drm_music");
            System.out.println ("GetListActivity.List.sdPath =" + sdPath);
            System.out.println ("GetListActivity.List.listFiles =" + sdPath.listFiles ());
            if (sdPath.listFiles (). length> 0)
            {
                for (File file: sdPath.listFiles ())
                {
                    Map <String, Object> map = new HashMap <String, Object> ();
                    map.put ("text_content", file.getName ());
                    list.add (map);
                    System.out.println ("name->" + file.getName ());
                }
            }
        }
        return list;
    }

    // Among them, getList () is used to scan local files to obtain the file name; set an adapter for ListView and display the scanned files on ListView. It should be noted here that the last two parameters of the adapter are arrays.
}

activity_get_list.xml is as follows:

<? xml version = "1.0" encoding = "utf-8"?>
<LinearLayout 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"
    tools: context = "com.iwanghang.sdcardsearchtolist.GetListActivity"
    android: orientation = "vertical">

    <TextView
        android: layout_width = "fill_parent"
        android: layout_height = "wrap_content"
        android: text = "Get local file information" />

    <Button
        android: id = "@ + id / myButton"
        android: layout_width = "fill_parent"
        android: layout_height = "wrap_content"
        android: text = "Scan" />
    <ListView
        android: id = "@ + id / listv"
        android: layout_width = "fill_parent"
        android: layout_height = "wrap_content"
        android: scrollbars = "vertical" />


</ LinearLayout>

itemlist.xml is as follows:

<? xml version = "1.0" encoding = "utf-8"?>
<TableLayout xmlns: android = "http://schemas.android.com/apk/res/android"
    android: id = "@ + id / lvitem"
    android: orientation = "vertical"
    android: layout_width = "match_parent"
    android: layout_height = "match_parent"
    android: stretchColumns = "*">

    <TableRow>
        <TextView
            android: id = "@ + id / myView1"
            android: layout_width = "wrap_content"
            android: layout_height = "wrap_content">
        </ TextView>
        <TextView
            android: id = "@ + id / myView2"
            android: layout_width = "wrap_content"
            android: layout_height = "wrap_content"
            >
        </ TextView>
        <TextView
            android: id = "@ + id / myView3"
            android: layout_width = "wrap_content"
            android: layout_height = "wrap_content">
        </ TextView>
    </ TableRow>

</ TableLayout>


Android development local and network Mp3 music player (eighteen) new download song loading preparation SdcardSearchToList