我正在做音乐播放器应用程序。并希望显示所有歌曲的类型。如果可能的话请给我一些暗示。我能够显示所有与艺术家和专辑相关的歌曲，但在寻找类型明智歌曲时面临问题。我的输出显示每种类型的所有歌曲类别。根据流派来说，它并不是在颂扬歌曲。我的代码在下面。 LocalGenre.java
package com.PageViewerTilesDemo.src;
import java.util.ArrayList;
import android.app.Activity;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.Window;
import android.widget.ExpandableListView;
import android.widget.TextView;
public class LocanGenre extends Activity {
ExpandableListView listLocalArtists;
TextView txttitle;
Cursor musiccursor, musiccursor1;
int music_column_index, music_column_index1;
int count, count1;
ArrayList<String> genresName = new ArrayList<String>();
ArrayList<String> genreID = new ArrayList<String>();
ArrayList<Integer> albumID = new ArrayList<Integer>();
ArrayList<String> numberOFSongs = new ArrayList<String>();
ArrayList<String> artistName = new ArrayList<String>();
ArrayList<String> path = new ArrayList<String>();
ArrayList<String> path12 = new ArrayList<String>();
ArrayList<ArrayList<String>> pathDisplay = new ArrayList<ArrayList<String>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.localartists);
txttitle = (TextView) findViewById(R.id.title);
txttitle.setText("Genres");
listLocalArtists = (ExpandableListView) findViewById(R.id.listView1);
init_phone_music_grid();
listLocalArtists.setAdapter(new ExpandableListGenreAdapter(this, path, genresName,
genresName, pathDisplay,albumID));
}
private void init_phone_music_grid() {
// TODO Auto-generated method stub
System.gc();
String[] proj = {
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.ALBUM_ID};
musiccursor1 = managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, proj, null, null,
null);
count1 = musiccursor1.getCount();
if (count1 > 0) {
musiccursor1.moveToFirst();
do {
music_column_index1 = musiccursor1
.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
String filename0 = musiccursor1.getString(music_column_index1);
path.add(filename0);
Log.i("LocalGenres ", "Path Main" + path);
music_column_index1 = musiccursor1
.getColumnIndexOrThrow(MediaStore.Audio.Media._ID);
String filename123 = musiccursor1
.getString(music_column_index1);
path12.add(filename123);
Log.i("LocalGenre", "Media ID " + path12);
music_column_index1 = musiccursor1
.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID);
int filename1 = musiccursor1.getInt(music_column_index1);
albumID.add(filename1);
Log.i("LOCAL Genres!!!", " ALBUM ID" + albumID);
} while (musiccursor1.moveToNext());
}
String[] projection = { MediaStore.Audio.Genres._ID,
MediaStore.Audio.Genres.NAME};
musiccursor = managedQuery(
MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI, projection, null,
null, null);
genresName.clear();
count = musiccursor.getCount();
if (count > 0) {
musiccursor.moveToFirst();
do {
music_column_index = musiccursor
.getColumnIndexOrThrow(MediaStore.Audio.Genres._ID);
String filename = musiccursor.getString(music_column_index);
if(!genreID.contains(filename))
{
genreID.add(filename);
}
Log.i("Local Genres ", "Genre ID" + genreID);
music_column_index = musiccursor
.getColumnIndexOrThrow(MediaStore.Audio.Genres.NAME);
String filename1 = musiccursor.getString(music_column_index);
if(!genresName.contains(filename1))
{
genresName.add(filename1);
}
Log.i("Local Genres ", "Genres Name " + genresName);
/*
* music_column_index = musiccursor
* .getColumnIndexOrThrow(MediaStore.Audio.Genres._COUNT);
*
* String filename3 = musiccursor.getString(music_column_index);
* artistName.add(filename3);
*
* Log.i("Local Albums ", "Album ID for Gen " + artistName);
*/
} while (musiccursor.moveToNext());
}
for (int j = 0; j < genreID.size(); j++) {
ArrayList<String> arr = new ArrayList<String>();
for (int i = 0; i < path12.size(); i++) {
Log.i("EEEEEE", "Inside If path12.get(i) :"+path12.get(i));
Log.i("EEEEEE", "Inside If genreID.get(j) :"+genreID.get(j));
Log.i("EEEEEE", "Inside If Integer.parseInt(path12.get(i)) :"+Integer.parseInt(path12.get(i)));
Log.i("EEEEEE", "Inside If j : "+j);
if (path12.get(i).equalsIgnoreCase(genreID.get(j)) || Integer.parseInt(path12.get(i))>j) {
Log.i("EEEEEE", "Inside If");
arr.add(path.get(i));
}
else
Log.i("xxxxxxx", "Inside else");
arr.add(path.get(i));
}
Log.i("EEEEEE", "Inside outerloop " + arr);
pathDisplay.add(arr);
}
}
}
ExpandableListGenreAdapter.java
package com.PageViewerTilesDemo.src;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ExpandableListGenreAdapter extends BaseExpandableListAdapter{
private Context context;
private ArrayList<String> artist;
private ArrayList<String> genres;
private ArrayList<ArrayList<String>> children;
public ArrayList<String> pathmain ;
public ArrayList<Integer> genresID;
public ArrayList<Integer> albumID;
public ExpandableListGenreAdapter(Context context, ArrayList<String> path, ArrayList<String> groups,ArrayList<String> artist,
ArrayList<ArrayList<String>> children, ArrayList<Integer> albumID) {
this.context = context;
this.genres = groups;
this.artist = artist;
this.pathmain = path;
this.children = children;
this.albumID=albumID;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return children.get(groupPosition).get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
/*public Bitmap getAlbumart(int album_id)
{
Bitmap bm = null;
try
{
final Uri sArtworkUri = Uri
.parse("content://media/external/audio/albumart");
Uri uri = ContentUris.withAppendedId(sArtworkUri, album_id);
ParcelFileDescriptor pfd = context.getContentResolver()
.openFileDescriptor(uri, "r");
if (pfd != null)
{
FileDescriptor fd = pfd.getFileDescriptor();
bm = BitmapFactory.decodeFileDescriptor(fd);
}
} catch (Exception e) {
}
return bm;
}*/
@Override
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final String vehicle = (String) getChild(groupPosition, childPosition);
Log.i("ExpandableListAdapter", "Group Position "+groupPosition);
Log.i("ExpandableListAdapter", "Vehicle "+vehicle);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.child_layout, null);
}
TextView tv = (TextView) convertView.findViewById(R.id.tvChild);
ImageView imageview1=(ImageView)convertView.findViewById(R.id.ImageView01);
// bm=getAlbumart(albumids.get(1));
// Log.i("LIST ADAPTER","@@@@@@@@@@@@@@@@@@@ALBUM IDS "+albumids.get(0)+"BITMAPPPPP@@@"+bm);
// imageview1.setImageBitmap(coverart.get(childPosition));
tv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
MainActivity.flag = true;
TestFragment3.flag = true;
Firstpage.flag = true;
Log.i("ExpandableListGenreAdapter", "path "+childPosition);
MainActivity.currentPosition = groupPosition;
Log.i("ExpandableListGenreAdapter", "currentPosition "+MainActivity.currentPosition);
MainActivity.genre=true;
MainActivity.currentgenreposition = albumID.get(childPosition);
Log.i("ExpandableListGenreAdapter", "currentGenrePosition "+MainActivity.currentgenreposition);
MainActivity.Media_full_path = "/sdcard/"+vehicle;
Log.i("ExpandableListAdapter", "Onclick "+MainActivity.Media_full_path);
((Activity)context).finish();
}
});
tv.setText(" " + vehicle.toString());
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return children.get(groupPosition).size();
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return genres.get(groupPosition);
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return genres.size();
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String group = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.group_layout, null);
}
TextView txtArtistsName = (TextView) convertView.findViewById(R.id.txtArtistsName);
TextView txtartistssongs = (TextView) convertView.findViewById(R.id.txtartistssongs);
txtArtistsName.setText(group);
txtartistssongs.setText(genres.get(groupPosition)+" Song(s)");
return convertView;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
}
请建议我上述代码中缺少哪里。谢谢。
答案 0 :(得分：11)
希望这会对你有所帮助。它显示了流派和他们的歌曲。
int index;
long genreId;
Uri uri;
Cursor genrecursor;
Cursor tempcursor;
String[] proj1 = {MediaStore.Audio.Genres.NAME, MediaStore.Audio.Genres._ID};
String[] proj2 = {MediaStore.Audio.Media.DISPLAY_NAME};
genrecursor = managedQuery(MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI, proj1, null, null, null);
if (genrecursor.moveToFirst()) {
do {
index = genrecursor.getColumnIndexOrThrow(MediaStore.Audio.Genres.NAME);
Log.i("Tag-Genre name", genrecursor.getString(index));
index = genrecursor.getColumnIndexOrThrow(MediaStore.Audio.Genres._ID);
genreId = Long.parseLong(genrecursor.getString(index));
uri = MediaStore.Audio.Genres.Members.getContentUri("external", genreId);
tempcursor = managedQuery(uri, proj2, null,null,null);
Log.i("Tag-Number of songs for this genre", tempcursor.getCount() + "");
if (tempcursor.moveToFirst()) {
do {
index = tempcursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
Log.i("Tag-Song name", tempcursor.getString(index));
} while(tempcursor.moveToNext());
}
} while(genrecursor.moveToNext());
}
答案 1 :(得分：1)
我更新了@Abhijeet的答案，以便使用旧版本
public void getGenres(int total) {
int index;
long genreId;
Uri uri;
Cursor genrecursor;
Cursor tempcursor;
String[] proj1 = {MediaStore.Audio.Genres.NAME, MediaStore.Audio.Genres._ID};
String[] proj2={MediaStore.Audio.Media.DISPLAY_NAME};
String result;
genrecursor = MyApplication.getAppContext().getContentResolver().query(MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI, proj1, null, null, null);
ArrayList<Genre> genres = new ArrayList<Genre>();
Genre genre = null;
if (genrecursor!=null && genrecursor.moveToFirst()) {
do {
genre = new Genre();
index = genrecursor.getColumnIndexOrThrow(MediaStore.Audio.Genres.NAME);
if (BuildConfig.DEBUG) Log.i("Tag-Genre name", genrecursor.getString(index));
genre.setName(genrecursor.getString(index));
if(genre.getName().equalsIgnoreCase("")) {
genre.setName("no-genre");
}
index = genrecursor.getColumnIndexOrThrow(MediaStore.Audio.Genres._ID);
genreId = Long.parseLong(genrecursor.getString(index));
uri = MediaStore.Audio.Genres.Members.getContentUri("external", genreId);
tempcursor = MyApplication.getAppContext().getContentResolver().query(uri, proj2, null, null, null);
if (BuildConfig.DEBUG) Log.i("Tag-Number of songs for this genre", tempcursor.getCount()+"");
genre.setNumberSongs( tempcursor.getCount());
if (!genres.contains(genre)) {
genres.add(genre);
}
if (tempcursor.moveToFirst()) {
do {
index = tempcursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
if (BuildConfig.DEBUG) Log.i("Tag-Song name", tempcursor.getString(index));
for(int i = 0;i<songs.size();i++) {
if (BuildConfig.DEBUG) Log.i("SONG", songs.get(i).getDisplayName()+ " - "+ tempcursor.getString(index));
if (tempcursor!=null && songs!=null && tempcursor.getString(index).equalsIgnoreCase(songs.get(i).getDisplayName()) ) {
songs.get(i).setGenre(genre.getName());
if (genre.isOldVersion()) {
genre.setNumberSongs(genre.getNumberSongs()+1);
}
if (genre.getNumberSongs()==0) { //Is an oldversion of android, less than 3.0
genre.setOldVersion(true);
genre.setNumberSongs(1);
}
}
}
} while(tempcursor.moveToNext());
}
} while(genrecursor.moveToNext());
}
orderList(genres);
result = "";
for(int i = 0; i < 10 && i<genres.size() ;i++) {
result += genres.get(i).toString()+",";
}
result += "Total:"+total;
}