使用MeidaStore.Audio获得手机中的音频文件
2024-10-22 10:46:58
MediaStore是安卓系统自带的多媒体系统数据库，他在每次开机时刷新一次，可以通过Cursor这个类对数据库进行访问与修改，修改之后需用广播强制刷新。
使用Cursor必须通过Context获得ContentResolver的对象实例。
Cursor cursor1 = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,null);
代码中的context既是调用该函数的活动的对象，先上个封装了音乐信息的类
public class Music {
private String filename;
private String title;
private int during;
private String singer;
private String type;
private String size;
private String fileUrl;
public Music(String filename,String title,int during,String singer,String type,String size,String fileUrl){
this.filename = filename;
this.title = title;
this.during = during;
this.singer = singer;
this.type = type;
this.size = size;
this.fileUrl = fileUrl;
}
public String toString(){
return "song[filename="+filename+", title="+title+", during="+during+", singer="+singer+", type="+type+", size="+size+", fileUrl="+fileUrl+"]";
}
public String getFilename() {
return filename;
}
public void setFilename(String filename) {
this.filename = filename;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getDuring() {
return during;
}
public void setDuring(int during) {
this.during = during;
}
public String getSinger() {
return singer;
}
public void setSinger(String singer) {
this.singer = singer;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getSize() {
return size;
}
public void setSize(String size) {
this.size = size;
}
public String getFileUrl() {
return fileUrl;
}
public void setFileUrl(String fileUrl) {
this.fileUrl = fileUrl;
}
}
下面就是用Cursor操作数据库的帮助类了
public class MusicHelper{
public static List<Music> songs = new ArrayList<Music>();
public static List<Music> getAllsongs(Context context){
Cursor cursor1 = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,null);
getcorrSongs(cursor1);
Cursor cursor2 = context.getContentResolver().query(MediaStore.Audio.Media.INTERNAL_CONTENT_URI,null,null,null,null);
getcorrSongs(cursor2);
return songs;
}
public static void getcorrSongs(Cursor cursor){
Music song = null;
if(cursor != null){
while(cursor.moveToNext()){
String filename = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));
String title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));
int during = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));
String singer = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));
String type = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.MIME_TYPE));
String size = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));
String date = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
song = new Music(filename,title,during,singer,type,size,date);
songs.add(song);
}
cursor.close();
}
}
}
参数content即用活动的this引用传入。
allsongs = MusicHelper.getAllsongs(this);
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