Slide 1
Slide 1 text
MediaStore
Keishin Yokomaku @ Drivemode, Inc.
kyobashi.dex #3
Slide 2
Slide 2 text
@KeithYokoma
• Keishin Yokomaku at Drivemode, Inc.
• Work
• Android apps
• Android Training and its publication
• Like
• Bicycle, Photography, Tumblr and Motorsport
• ·͓ͨલ͔
Slide 3
Slide 3 text
MediaStore
Slide 4
Slide 4 text
MediaStore is Կ
• ʹอଘ͞ΕͨԻָɾը૾ɾಈըͷཧΛ͢Δσʔλϕʔε
• MediaStore.Audio, MediaStore.Images, MediaStore.Video
• Uri ͱ֤छͷΧϥϜใ͕ఏڙ͞Ε͍ͯΔ
• EXTERNAL_CONTENT_URI ͱ INTERNAL_CONTENT_URI
• MediaStore.Audio.Media MediaStore.Images.Media ͳͲ
Slide 5
Slide 5 text
MediaStore is Կ
public class SampleActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor albums = null;
try {
albums = getContentResolver().query(
MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, null, null, null);
} finally {
if (albums != null)
albums.close();
}
}
}
Slide 6
Slide 6 text
MediaStore is Կ
public class SampleActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor albums = null;
try {
albums = getContentResolver().query(
MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, null, null, null);
} finally {
if (albums != null)
albums.close();
}
}
}
Slide 7
Slide 7 text
Ṗଟ͖ MediaStore
• ऴΘΒ͵ѱ͖͠ܧঝͷ࿈ͱΧϥϜͷࠞಱ
• ΧϥϜใʹܧঝؔ͋Δ͕ɺͰఆٛ͞ΕͨΧϥϜใ͕ࢠͰ
͑ΔͱݶΒͳ͍
• MediaColumns Իָɾը૾ɾಈըͯ͢ͷڞ௨ͷΧϥϜใΛ࣋ͬ
͍ͯΔ͕ৗʹͦͷΧϥϜใ͕͑ΔͱݶΒͳ͍
• ΧϥϜͷ੍͕ϫΧϥφΠ
• Javadoc ʹॻ͍ͯͳ͍ͷͰͬͯΈͯॳΊͯؾ͕ͭ͘
Slide 8
Slide 8 text
Ṗଟ͖ MediaStore
• Ҿ͖ํ͕͍·͍ͪෆ໌ͳσʔλ
• దͳ Uri ΛΘͳ͍ͱऔͬͯ͜Εͳ͍ΧϥϜ͕͋Δ
• શΧϥϜΛऔಘͨ͠ͱ͖ʹԿ͕ೖͬͯΔ͔ϫΧϥφΠ
• υΩϡϝϯτʹͳ͍ Uri ͕͋ͬͨΓɺͦΕΛΘͳ͍ͱ໘͍࣮͘͞
Λ͠ͳ͍ͱ͍͚ͳ͔ͬͨΓ͢Δ
• ΄΅ϊʔίϝϯτɾυΩϡϝϯτ
Slide 9
Slide 9 text
Ṗଟ͖ MediaStore
• ੲͷΪϟϥϦʔΞϓϦ MediaStore ʹ SQL ΠϯδΣΫγϣϯΛ͍ͯͨ͠
• ࣸਅΛσΟϨΫτϦ͝ͱʹ͚Δ֓೦ը૾ͻͱͭͻͱͭͷσʔλʹ݁
߹͍ͯ͠Δ
• άϧʔϓԽ͠ͳ͍ͱσΟϨΫτϦͷ֓೦͕ͱΓͩͤͳ͍
• ContentResolver ʹάϧʔϓԽͷ API ͳ͍
• SQL ΠϯδΣΫγϣϯͰରԠ͢Δߥۀ
Slide 10
Slide 10 text
͏ŵŧƄແཧɻϦεΧ͠ΐ……
Slide 11
Slide 11 text
Ͳ͏͢Δ
• ະͳ෦͕ଟ͍ͱ͍͑ɺ͔ͬͯ͠·͑Ҿ͖ํҰఆʹͳΔ
• ϘΠϥʔϓϨʔτԽ͢Δͷʹݟ͍͑ͯΔ
• Cursor Λͦͷ··͏ͷؾ͕໓ೖΔ
• ·ͩ ContentResolver Ͱফ͢ΔͭΓͳͷʁ
• ੍ใϝιουͷҾͱͯ͠ඞͣࢦఆ͢ΔΑ͏ʹͯ͠ݟ͑ΔԽ͍ͨ͠
Slide 12
Slide 12 text
͏ŵŧƄແཧɻϥΠϒϥϦʹ͠ΐ
Slide 13
Slide 13 text
MediaFacade
Slide 14
Slide 14 text
MediaFacade
• https://github.com/Drivemode/MediaFacade
• ·ͩϦϦʔε͍ͯ͠ͳ͍
• Ұ௨ΓԻָɾը૾ɾಈըͷ API ͕ͦΖ͍ͬͯΔ
• ΈΜͳେ͖γϯάϧτϯ
• Cursor ͷྑ͞Λ׆͔ͭͭ͠ɺσʔλͷΞΫηεΛ͘͢͠
Slide 15
Slide 15 text
ྫɿΞϧόϜ(Իָ)ͷऔಘ
public class SampleActivity extends Activity {
private AudioFacade facade;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
facade = AudioFacade.getInstance(this);
Cursor albums = null;
try {
albums = facade.album().fetchAlbum();
// do whatever you like with the album metadata
} finally {
if (albums != null)
albums.close();
}
}
}
Slide 16
Slide 16 text
ྫɿΞϧόϜ(Իָ)ͷऔಘ
public class SampleActivity extends Activity {
private AudioFacade facade;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
facade = AudioFacade.getInstance(this);
Cursor albums = null;
try {
albums = facade.album().fetchAlbum();
// do whatever you like with the album metadata
} finally {
if (albums != null)
albums.close();
}
}
}
Slide 17
Slide 17 text
ྫɿΞϧόϜ(Իָ)ͷऔಘ
public class SampleActivity extends Activity {
private AudioFacade facade;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
facade = AudioFacade.getInstance(this);
Cursor albums = null;
try {
albums = facade.album().fetchAlbum();
// do whatever you like with the album metadata
} finally {
if (albums != null)
albums.close();
}
}
}
Slide 18
Slide 18 text
ྫɿΞϧόϜ(Իָ)ͷऔಘ
AlbumCursor albums = null;
try {
albums = facade.album().fetchAlbum();
while (albums.moveToNext()) {
long id = albums.id();
String name = albums.displayName();
// ……
}
} finally {
if (albums != null)
albums.close();
}
Slide 19
Slide 19 text
ྫɿΞϧόϜ(Իָ)ͷऔಘ
AlbumCursor albums = null;
try {
albums = facade.album().fetchAlbum();
while (albums.moveToNext()) {
long id = albums.id();
String name = albums.displayName();
// ……
}
} finally {
if (albums != null)
albums.close();
}
Slide 20
Slide 20 text
Α͞
• ContentResolver ܦ༝Ͱͷૢ࡞Λϥοϓ͠ɺԿΛҾ͖͍͔ͨ͝ͱʹϝιο
υ͕Θ͔Ε͍ͯΔͷͰαοͱ͑Δ
• ୯७ͳߏͳͷͰ؆୯ʹ Rx ͳͲͰϥοϓͰ͖Δ
• طଘͷ Android ͷ API ͱͷੑ΄΅ͦͷ··(Loader ͋·Γߟ͑ͯ
͍ͳ͍)
• औ͖ͬͯͨ Cursor ͔ΒϝιουҰൃͰͱΓ͍ͨσʔλʹΞΫηεͰ͖Δ
• Θ͍͠ΧϥϜ໊ࢦఆ͔ΒαϤφϥʂ
Slide 21
Slide 21 text
ॿ͚ͯཉ͍͜͠ͱ
• ґଘ͕͋Δͧ
• ṖͷΧϥϜ͕ੜ͑ͯͨΓɺṖͷσʔλ͕ೖ͍ͬͯͨΓ
• ΧϥϜ͕૿͍͑ͯΔʹେͯ͠ࠔΒͳ͍͕ɺຊདྷΧϥϜʹೖ͍ͬͯΔ
ͣͷͳ͍σʔλ͕ೖ͍ͬͯΔͱ͖ࠔΔ
• OSS ίϯτϦϏϡʔτνϟϯεʂ
Slide 22
Slide 22 text
MediaStore
Keishin Yokomaku @ Drivemode, Inc.
kyobashi.dex #3