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aspect ratio of the logical display that third-party apps are rendered within, as can be derived from the
height and width values reported through the view.Display APIs and Configuration API, MUST meet the
following requirements:
[C-0-1] Device implementations with the Configuration.uiMode set as
UI_MODE_TYPE_NORMAL MUST have an aspect ratio value between 1.3333 (4:3) and 1.86
(roughly 16:9), unless the app can be deemed as ready to be stretched longer by meeting
one of the following conditions:
The app has declared that it supports a larger screen aspect ratio through the
android.max_aspect metadata value.
The app declares it is resizeable via the android:resizeableActivity attribute.
The app is targeting API level 24 or higher and does not declare a
android:MaxAspectRatio that would restrict the allowed aspect ratio.
[C-0-2] Device implementations with the Configuration.uiMode set as UI_MODE_TYPE_WATCH
MUST have an aspect ratio value set as 1.0 (1:1).
7.1.1.3. Screen Density
The Android UI framework defines a set of standard logical densities to help application developers
target application resources.
[C-0-1] By default, device implementations MUST report only one of the following logical
Android framework densities through the DENSITY_DEVICE_STABLE API and this value
MUST NOT change at any time; however, the device MAY report a different arbitrary
density according to the display configuration changes made by the user (for example,
display size) set after initial boot.
120 dpi (ldpi)
160 dpi (mdpi)
213 dpi (tvdpi)
240 dpi (hdpi)
260 dpi (260dpi)
280 dpi (280dpi)
300 dpi (300dpi)
320 dpi (xhdpi)
340 dpi (340dpi)
360 dpi (360dpi)
400 dpi (400dpi)
420 dpi (420dpi)
480 dpi (xxhdpi)
560 dpi (560dpi)
640 dpi (xxxhdpi)
Device implementations SHOULD define the standard Android framework density that is
numerically closest to the physical density of the screen, unless that logical density
pushes the reported screen size below the minimum supported. If the standard Android
framework density that is numerically closest to the physical density results in a screen
size that is smaller than the smallest supported compatible screen size (320 dp width),
device implementations SHOULD report the next lowest standard Android framework
density.
If there is an affordance to change the display size of the device:
Page 73 of 132
Содержание
- Compatibility definition p.1
- Android 9 p.1
- Device types p.2
- Device configurations p.2
- Background restriction p.2
- Automotive requirements p.2
- Web compatibility p.2
- Api namespaces p.2
- Watch requirements p.2
- Api behavioral compatibility p.2
- User interface compatibility p.2
- Android library p.2
- Television requirements p.2
- Tablet requirements p.2
- Android extensions p.2
- Software p.2
- Soft api compatibility p.2
- Runtime compatibility p.2
- Native api compatibility p.2
- Managed api compatibility p.2
- Introduction p.2
- Handheld requirements p.2
- Document structure p.2
- Audio latency p.3
- Multimedia compatibility p.3
- Application packaging compatibility p.3
- Media ui p.3
- Media codecs p.3
- Accessibility p.3
- Managed user support p.3
- Instant apps p.3
- Heavyweight apps p.3
- Hardware compatibility p.3
- Video encoding p.3
- Display and graphics p.3
- Video decoding p.3
- Device administration p.3
- Tv input framework p.3
- Developer tools and options compatibility p.3
- Text to speech p.3
- Developer tools p.3
- Secure media p.3
- Developer options p.3
- Companion device pairing p.3
- Quick settings p.3
- Capture for unprocessed p.3
- Professional audio p.3
- Audio recording p.3
- Network protocols p.3
- Audio playback p.3
- Musical instrument digital interface midi p.3
- Sensors p.4
- Pose sensor p.4
- Memory and storage p.4
- Input devices p.4
- Data connectivity p.4
- Cameras p.4
- Contact us p.5
- Updatable software p.5
- Software compatibility testing p.5
- Security model compatibility p.5
- Performance and power p.5
- Document changelog p.5
- Requirements by device type p.6
- Requirement id p.6
- Introduction p.6
- Document structure p.6
- Requirement id in section 2 p.7
- Hardware p.7
- Handheld requirements p.7
- Device types p.7
- Device configurations p.7
- Multimedia p.10
- Software p.11
- Performance and power p.12
- Television requirements p.13
- Security model p.13
- Hardware p.14
- Multimedia p.15
- Software p.16
- Performance and power p.17
- Watch requirements p.18
- Software p.18
- Multimedia p.18
- Hardware p.18
- Performance and power p.19
- Hardware p.19
- Automotive requirements p.19
- Software p.22
- Multimedia p.22
- Performance and power p.23
- Tablet requirements p.24
- Software p.24
- Security model p.24
- Hardware p.24
- Managed api compatibility p.25
- Android library p.25
- Android extensions p.25
- Soft api compatibility p.26
- Permissions p.26
- Build parameters p.26
- Intent compatibility p.29
- Activities on secondary displays p.31
- Application binary interfaces p.32
- Native api compatibility p.32
- Bit arm native code compatibility p.33
- Webview compatibility p.34
- Web compatibility p.34
- Browser compatibility p.34
- Api behavioral compatibility p.35
- Background restriction p.36
- Api namespaces p.36
- Runtime compatibility p.37
- User interface compatibility p.39
- Launcher home screen p.39
- Widgets p.40
- Notifications p.40
- Search p.42
- Alerts and toasts p.42
- Themes p.43
- Live wallpapers p.43
- Activity switching p.44
- Lock screen media control p.44
- Input management p.44
- Unicode and font p.45
- Screen savers previously dreams p.45
- Multi windows p.45
- Location p.45
- Display cutout p.46
- Device administration p.46
- Device provisioning p.47
- Managed profile support p.48
- Text to speech p.49
- Managed user support p.49
- Accessibility p.49
- Quick settings p.50
- Media ui p.50
- Instant apps p.50
- Tv input framework p.50
- Heavyweight apps p.51
- Companion device pairing p.51
- Application packaging compatibility p.51
- Multimedia compatibility p.52
- Media codecs p.53
- Audio encoding p.53
- Audio decoding p.53
- Audio codecs details p.54
- Image encoding p.55
- Image decoding p.55
- Video codecs list p.56
- Video codecs p.56
- Image codecs details p.56
- Video encoding p.57
- Mpeg 2 p.59
- Video decoding p.59
- Mpeg 4 p.59
- H 65 hevc p.60
- Raw audio capture p.61
- Audio recording p.61
- Capture for voice recognition p.62
- Capture for rerouting of playback p.62
- Raw audio playback p.63
- Audio playback p.63
- Audio output volume p.63
- Audio latency p.63
- Audio effects p.63
- Network protocols p.65
- Secure media p.66
- Professional audio p.66
- Musical instrument digital interface midi p.66
- Capture for unprocessed p.68
- Developer tools and options compatibility p.69
- Developer tools p.69
- Hardware compatibility p.71
- Display and graphics p.71
- Developer options p.71
- Screen configuration p.72
- Screen orientation p.74
- Display metrics p.74
- D and 3d graphics acceleration p.74
- Secondary displays p.77
- Screen technology p.77
- Legacy application compatibility mode p.77
- Navigation keys p.78
- Keyboard p.78
- Input devices p.78
- Non touch navigation p.78
- Touchscreen input p.79
- Fake touch input p.80
- Game controller support p.81
- Sensors p.82
- Remote control p.82
- Accelerometer p.83
- Magnetometer p.84
- Gyroscope p.86
- Thermometer p.87
- Photometer p.87
- Barometer p.87
- Proximity sensor p.88
- High fidelity sensors p.88
- Biometric sensors p.90
- Android automotive only sensors p.92
- Telephony p.93
- Pose sensor p.93
- Data connectivity p.93
- Ieee 802 1 wi fi p.94
- Bluetooth p.97
- Near field communications p.98
- Minimum network capability p.100
- Sync settings p.101
- Secure elements p.101
- Rear facing camera p.101
- Data saver p.101
- Cameras p.101
- Front facing camera p.102
- External camera p.103
- Camera api behavior p.103
- Camera orientation p.104
- Memory and storage p.104
- Minimum memory and storage p.105
- Application shared storage p.105
- Usb peripheral mode p.106
- Adoptable storage p.106
- Usb host mode p.107
- Microphone p.108
- Audio output p.108
- Near ultrasound p.109
- Virtual reality mode high performance p.110
- Virtual reality mode p.110
- Virtual reality p.110
- User experience consistency p.112
- Power saving modes p.112
- Performance and power p.112
- File i o access performance p.112
- Power consumption accounting p.113
- Consistent performance p.113
- Security model compatibility p.114
- Permissions p.114
- Uid and process isolation p.115
- Filesystem permissions p.115
- Multi user support p.116
- Alternate execution environments p.116
- Security features p.117
- Premium sms warning p.117
- Usage history p.119
- Recording p.119
- Privacy p.119
- Network traffic p.120
- Data storage encryption p.120
- Connectivity p.120
- File based encryption p.121
- Direct boot p.121
- Full disk encryption p.122
- Device integrity p.122
- Keys and credentials p.123
- Secure lock screen p.124
- Strongbox p.127
- Safe boot mode p.128
- Data deletion p.128
- Subscription plans p.129
- Software compatibility testing p.129
- Compatibility test suite p.129
- Automotive vehicle system isolation p.129
- Updatable software p.130
- Cts verifier p.130
- Changelog viewing tips p.131
- Document changelog p.131
- Contact us p.132
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