系统 DPI¶
本章节介绍如何修改 Android 系统的屏幕显示密度（DPI），以适配不同分辨率的显示屏。
默认 DPI 与配置文件¶
各板卡对应的 DPI 配置文件和默认值如下：
| 型号 | 芯片 | SDK | 默认 DPI | 配置文件 |
|---|---|---|---|---|
| K1 / K1B | RK3568 | rk-android13.0 | 200 | device/rockchip/rk356x/rk3568_t/rk3568_t.mk |
| K1 MINI | RK3568 | rk-android13.0 / rk-android14.0 | 200 | device/rockchip/rk356x/rk3568_t/rk3568_t.mk |
| K2B / K2C | H618 | h618-android12.0 | 200 | device/softwinner/apollo/apollo_p2.mk |
| K3 | RK3562 | rk-android13.0 | 200 | device/rockchip/rk3562/rk3562_t/rk3562_t.mk |
| K3B | RK3562 | rk-android13.0 / rk-android14.0 | 200 | device/rockchip/rk3562/rk3562_t/rk3562_t.mk |
| K5 / K5C | A133 | a133-android10.0 | 160 | android/device/softwinner/ceres-c3/ceres_c3.mk |
| K7 / K7C / K7S_K7F | RK3576 | rk3576-android14.0 | 200 | device/rockchip/rk3576/rk3576_u/rk3576_u.mk |
| K8 | RK3588 | rk-android13.0 | 200 | device/rockchip/rk3588/rk3588_t/rk3588_t.mk |
| K8D | RK3588S | rk-android13.0 / rk-android14.0 | 280 | device/rockchip/rk3588/rk3588s_t/rk3588s_t.mk |
| K9 | T527 | t527-android13.0 | 160 | device/softwinner/saturn/t527-demo/device-common.mk |
| K10B | A733 | a733-android13.0 | 160 | device/softwinner/jupiter/a733-demo-aiot/device-common.mk |
| K11C | RK3566 | rk-android13.0 / rk-android14.0 | 200 | device/rockchip/rk356x/rk3566_t/rk3566_t.mk |
| TX66 | RK3566 | rk-android13.0 | 200 | device/rockchip/rk356x/rk3566_t/rk3566_t.mk |
源码修改¶
在对应配置文件中修改 ro.sf.lcd_density 属性值，以 K1 (RK3568) 为例：
--- a/device/rockchip/rk356x/rk3568_t/rk3568_t.mk
+++ b/device/rockchip/rk356x/rk3568_t/rk3568_t.mk
@@ -40,7 +40,7 @@
## add Rockchip properties
#
-PRODUCT_PROPERTY_OVERRIDES += ro.sf.lcd_density=200
+PRODUCT_PROPERTY_OVERRIDES += ro.sf.lcd_density=120
PRODUCT_PROPERTY_OVERRIDES += ro.wifi.sleep.power.down=true
PRODUCT_PROPERTY_OVERRIDES += persist.wifi.sleep.delay.ms=0
其他板卡修改上表中对应的配置文件即可，修改后需重新编译烧录。
命令行临时修改¶
修改后可通过命令行实时生效（重启后恢复默认值）：
如需永久生效，需修改对应配置文件后重新编译烧录。