由网友(王的溫柔.)分享简介：寻找的方式来获得音乐文件从Android的MediaStore为输入的目录路径只有文件夹路径。所以实际上的问题是如何让正确的查询到MediaStore。Looking for the way to get only folder paths of music files from Android MediaStore...
寻找的方式来获得音乐文件从Android的MediaStore为输入的目录路径只有文件夹路径。所以实际上的问题是如何让正确的查询到MediaStore。
Looking for the way to get only folder paths of music files from Android MediaStore for inputted directory path. So actually question is about how to make proper query to the MediaStore.
下面是一个例子。 我现在的code：
Here is an example. My current code:
String dirPath="/mnt/sdcard/Music/";
String selection =MediaStore.Audio.Media.DATA +" like ?";
String[] projection = {MediaStore.Audio.Media.DATA};
String[] selectionArgs={dirPath+"%"};
Cursor cursor = this.managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
projection,
selection,
selectionArgs,
null);
List<String> songs = new ArrayList<String>();
while(cursor.moveToNext())
songs.add(cursor.getString(0));
因此，我们将不得不在歌曲列表水木清华这样的：
As a result we’ll have in the songs List smth like:
/mnt/sdcard/Music/song1.mp3
/mnt/sdcard/Music/song2.mp3
/mnt/sdcard/Music/FolderWithSongs/song3.mp3
/mnt/sdcard/Music/AnotherFolderWithSongs/song4.mp3
/mnt/sdcard/Music/AndOneMoreFolder/song5.mp3
/mnt/sdcard/Music/AndOneMoreFolder/song6.mp3
/mnt/sdcard/Music/AndOneMoreFolder/song7.mp3
/mnt/sdcard/Music/AndOneMoreFolder/SomeFolder/song8.mp3
/mnt/sdcard/Music/AndOneMoreFolder/SomeFolder/song9.mp3
什么实际上，我找 - 获得一个级别嵌套的路径，例如DISTINCT列表， dirPath 是这样的：
/mnt/sdcard/Music/FolderWithSongs/
/mnt/sdcard/Music/AnotherFolderWithSongs/
/mnt/sdcard/Music/AndOneMoreFolder/
如果在这里将当前文件夹的文件 - /mnt/sdcard/Music/song1.mp3 和
/mnt/sdcard/Music/song2.mp3 - 这是可以接受的太
If here will be current folder files - /mnt/sdcard/Music/song1.mp3 and
/mnt/sdcard/Music/song2.mp3 – it’s acceptable too.
任何想法？
修改 我已经发现了两个可能的解决方案： Android列表音乐文件夹，并发挥他们 和Construct一个树形结构从路径字符串列表 ，但我认为更好的办法来解决这个问题是可能的。
EDIT I've found two possible solutions: Android list music by folders and play them and Construct a tree structure from list of string paths , but I think better way to solve this problem is possible.
推荐答案
您必须使用这两种技术。 MediaStore和文件浏览器。
You will have to use both technique . MediaStore and file explorer .
public class MainActivity extends ActionBarActivity {
private File file;
private List<String> myList;
private ListView listView;
private TextView pathTextView;
private String mediapath = new String(Environment.getExternalStorageDirectory().getAbsolutePath());
private final static String[] acceptedExtensions= {"mp3", "mp2", "wav", "flac", "ogg", "au" , "snd", "mid", "midi", "kar"
, "mga", "aif", "aiff", "aifc", "m3u", "oga", "spx"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView=(ListView) findViewById(R.id.pathlist);
pathTextView=(TextView) findViewById(R.id.path);
myList = new ArrayList<String>();
String root_sd = Environment.getExternalStorageDirectory().toString();
Log.e("Root",root_sd);
String state = Environment.getExternalStorageState();
File list[] = null ;
/* if ( Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state) ) { // we can read the External Storage...
list=getAllFilesOfDir(Environment.getExternalStorageDirectory());
}*/
pathTextView.setText(root_sd);
file = new File( root_sd ) ;
list = file.listFiles(new AudioFilter());
Log.e("Size of list ","" +list.length);
//LoadDirectory(root_sd);
for( int i=0; i< list.length; i++)
{
String name=list[i].getName();
int count = getAudioFileCount(list[i].getAbsolutePath());
Log.e("Count : "+count, list[i].getAbsolutePath());
if(count!=0)
myList.add(name);
/*int count=getAllFilesOfDir(list[i]);
Log.e("Songs count ",""+count);
*/
}
listView.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
File temp_file = new File( file, myList.get( position ) );
if( !temp_file.isFile())
{
//LoadDirectory(myList.get( position ));
file = new File( file, myList.get( position ));
File list[] = file.listFiles(new AudioFilter());
myList.clear();
for( int i=0; i< list.length; i++)
{
String name=list[i].getName();
int count = getAudioFileCount(list[i].getAbsolutePath());
Log.e("Count : "+count, list[i].getAbsolutePath());
if(count!=0)
myList.add(name);
/*int count=getAllFilesOfDir(list[i]);
Log.e("Songs count ",""+count);
if(count!=0)
myList.add(name);*/
}
pathTextView.setText( file.toString());
//Toast.makeText(getApplicationContext(), file.toString(), Toast.LENGTH_LONG).show();
listView.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, myList ));
}
}
});
}
private int getAudioFileCount(String dirPath) {
String selection =MediaStore.Audio.Media.DATA +" like ?";
String[] projection = {MediaStore.Audio.Media.DATA};
String[] selectionArgs={dirPath+"%"};
Cursor cursor = this.managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
projection,
selection,
selectionArgs,
null);
return cursor.getCount();
}
@Override
public void onBackPressed() {
try {
String parent = file.getParent().toString();
file = new File( parent ) ;
File list[] = file.listFiles(new AudioFilter());
myList.clear();
for( int i=0; i< list.length; i++)
{
String name=list[i].getName();
int count = getAudioFileCount(list[i].getAbsolutePath());
Log.e("Count : "+count, list[i].getAbsolutePath());
if(count!=0)
myList.add(name);
/*int count=getAllFilesOfDir(list[i]);
Log.e("Songs count ",""+count);
if(count!=0)*/
}
pathTextView.setText(parent);
// Toast.makeText(getApplicationContext(), parent, Toast.LENGTH_LONG).show();
listView.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
} catch (Exception e) {
finish();
}
}
// class to limit the choices shown when browsing to SD card to media files
public class AudioFilter implements FileFilter {
// only want to see the following audio file types
private String[] extension = {".aac", ".mp3", ".wav", ".ogg", ".midi", ".3gp", ".mp4", ".m4a", ".amr", ".flac"};
@Override
public boolean accept(File pathname) {
// if we are looking at a directory/file that's not hidden we want to see it so return TRUE
if ((pathname.isDirectory() || pathname.isFile()) && !pathname.isHidden()){
return true;
}
// loops through and determines the extension of all files in the directory
// returns TRUE to only show the audio files defined in the String[] extension array
for (String ext : extension) {
if (pathname.getName().toLowerCase().endsWith(ext)) {
return true;
}
}
return false;
}
}
}
.xml文件：
.xml file :
<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"
android:orientation="vertical" >
<TextView
android:textSize="21sp"
android:typeface="monospace"
android:id="@+id/path"
android:layout_width="fill_parent"
android:layout_height="100dp"
android:layout_margin="10dp"
android:gravity="bottom"
android:text="PATH : " />
<View
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#111111" />
<ListView android:id="@+id/pathlist"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>
在manifiest文件权限：
Permissions in manifiest file :
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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