android音乐播放器_专辑列表

    专辑列表就是显示歌曲所属的专辑，也是用ListView来显示，同样也需要定义一个Adapter。

一、Activity

     

/** *  */package com.android.musicplayer.activity;import java.util.HashMap;import java.util.HashSet;import java.util.Iterator;import com.android.musicplayer.adapter.AlbumListAdapter;import android.app.Activity;import android.app.AlertDialog;import android.content.Intent;import android.database.Cursor;import android.os.Bundle;import android.provider.MediaStore;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;/** * @author Administrator *  */public class AlbumActivity extends Activity {private String[] albums;private ListView listView;private AlertDialog ad = null;private AlertDialog.Builder builder = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.albums);setListData();}private void setListData() {listView = (ListView) findViewById(R.id.albums_listview_id);listView.setCacheColorHint(00000000);// 设置这个就不会出现ListView滑动画面混乱的情况。Cursor c = this.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,new String[] { MediaStore.Audio.Media.TITLE,MediaStore.Audio.Media.DURATION,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.ALBUM,MediaStore.Audio.Media._ID,MediaStore.Audio.Media.DISPLAY_NAME }, null, null,MediaStore.Audio.Media.ALBUM);if (c == null || c.getCount() == 0) {builder = new AlertDialog.Builder(this);builder.setMessage("存储列表为空...").setPositiveButton("确定", null);ad = builder.create();ad.show();return;}c.moveToFirst();int num = c.getCount();HashSet<String> set = new HashSet<String>();for (int i = 0; i < num; i++) {String szAlbum = c.getString(c.getColumnIndex(MediaStore.Audio.Media.ALBUM));set.add(szAlbum);c.moveToNext();}num = set.size();Iterator<String> it = set.iterator();albums = new String[num];int i = 0;while (it.hasNext()) {albums[i] = it.next().toString();i++;}String album = "";for (int j = 0; j < num; j++) {if (j < num - 1) {album = album + "'" + albums[j] + "',";} else {album = album + "'" + albums[j] + "'";}}Cursor c1 = this.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,new String[] { MediaStore.Audio.Media.TITLE,MediaStore.Audio.Media.DURATION,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.ALBUM,MediaStore.Audio.Media._ID,MediaStore.Audio.Media.DISPLAY_NAME, }, null, null,MediaStore.Audio.Media.ALBUM);c1.moveToFirst();HashMap<String, String> map = new HashMap<String, String>();int num1 = c1.getCount();for (int j = 0; j < num1; j++) {map.put(c1.getString(3), c1.getString(2));c1.moveToNext();}listView.setAdapter(new AlbumListAdapter(this, albums, map));listView.setOnItemClickListener(new AlbumsItemClickListener());}class AlbumsItemClickListener implements OnItemClickListener {@Overridepublic void onItemClick(AdapterView<?> arg0, View view, int position,long id) {Intent intent = new Intent();intent.setClass(AlbumActivity.this, SongsOfAlbumActivity.class);intent.putExtra("albums", albums[position]);startActivity(intent);}}}

二、布局

1、albums.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="vertical" >    <ListView        android:id="@+id/albums_listview_id"        android:background="@drawable/listbg"        android:layout_width="match_parent"        android:layout_height="match_parent" >    </ListView></LinearLayout>

2、albumslist.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_marginTop="2dip"    android:background="@android:color/transparent"    android:orientation="horizontal" >    <ImageView        android:id="@+id/Albumsitem"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:paddingRight="5dip" />    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="60dip"        android:layout_weight="1"        android:gravity="center_vertical"        android:orientation="vertical" >        <TextView            android:id="@+id/album"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_gravity="center_vertical"            android:textColor="#ffffff"            android:textSize="18dp"            android:textStyle="bold" />        <TextView            android:id="@+id/mysinger"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_gravity="center_vertical"            android:layout_marginTop="5dip"            android:textColor="#ffffff"            android:textSize="13dp" />    </LinearLayout></LinearLayout>

三、适配器Adapter

/** *  */package com.android.musicplayer.adapter;import java.util.HashMap;import com.android.musicplayer.activity.R;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;/** * @author Administrator *  */public class AlbumListAdapter extends BaseAdapter {private Context myContext;private String[] albums;private HashMap<String, String> myMap;public AlbumListAdapter(Context context, String[] str1,HashMap<String, String> map) {myContext = context;albums = str1;myMap = map;}public int getCount() {return albums.length;}public Object getItem(int position) {return position;}public long getItemId(int position) {return position;}public View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = null;View vi = convertView;if (convertView == null) {holder = new ViewHolder();vi = LayoutInflater.from(myContext).inflate(R.layout.albumslist,null);holder.album = (TextView) vi.findViewById(R.id.album);holder.artist = (TextView) vi.findViewById(R.id.mysinger);holder.Albumsitem = (ImageView) vi.findViewById(R.id.Albumsitem);vi.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}if (albums[position].length() > 15) {// 设置专辑名holder.album.setText(albums[position].substring(0, 12) + "...");} else {holder.album.setText(albums[position]);}if (albums[position].equals("sdcard")) {// 设置艺术家姓名holder.artist.setText("未知艺术家");} else {holder.artist.setText(myMap.get(albums[position]));}holder.Albumsitem.setImageResource(R.drawable.album);return vi;}class ViewHolder {public TextView album, artist;public ImageView Albumsitem;}}

三、效果

                                                 

    

    这就是专辑列表，点击去进后会看到下面的歌曲。