android 本身限制应该没有，2013 年开始 android 就支持高分辨率了。现在一些平板手机超过1080p.
贴上log
# adb logcat|egrep '(384|192|128)0'
D/Displaymanager(138): display 0 iface HDMI connect 1 enable 1 mode 3840x2160p-30
D/Displaymanager(138): display 0 iface VGA connect 1 enable 0 mode 1920x1080p-60
D/Displaymanager(138): read cfg: display=0,iface=4,enable=1,mode=3840x2160p-25
D/Displaymanager(138): display 0 iface 4 connect 1 enable 1 mode 3840x2160p-25
D/Displaymanager(138): read cfg: display=0,iface=3,enable=0,mode=1920x1080p-60
D/Displaymanager(138): display 0 iface 3 connect 1 enable 0 mode 1920x1080p-60
D/Displaymanager(138): property 0 iface 4 type 1 mode 3840x2160p-25
I/(142): xres = 3840 px
I/(142): xres_virtual = 3840 px
D/hwcomposer(142): set default fake ui size 1280x720
D/hwcomposer(142): hwc_getDisplayAttributes disp = 0, width = 3840
D/BootAnimation(447): DISPLAY,W-H: 3840-2160, ori: 0
D/CameraHal(145): ParserDVConfig(667):DV_720P(720p) resolution(1280x720) fps(10) support(0)
D/CameraHal(145): ParserDVConfig(679):DV_1080P(1080p) resolution(1920x1080) fps(10) support(0)
D/CameraHal(145): ParserDVConfig(667):DV_720P(720p) resolution(1280x720) fps(10) support(1)
D/CameraHal(145): ParserDVConfig(679):DV_1080P(1080p) resolution(1920x1080) fps(10) support(1)
D/SensorService(470): Max socket buffer size 163840
I/DisplayManagerService(470): Display device added: DisplayDeviceInfo{"Built-in Screen": 3840 x 2160, 60.000004 fps, density 160, 159.895 x 159.953 dpi, touch INTERNAL, rotation 0, type BUILT_IN, FLAG_DEFAULT_DISPLAY, FLAG_ROTATES_WITH_CONTENT, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS}
D/Environment(470): screen raw size:3840,2160
D/Environment(470): screen raw size:3840,2160
D/Environment(470): screen raw size:3840,2160
D/Environment(470): screen raw size:3840,2160
D/Environment(470): screen raw size:3840,2160
D/qiuen (470): >>>CURRENT DISPLAY SIZE: 1920x1080
I/qiuen (470): FORCED DISPLAY SIZE: 1920x1080
I/ActivityManager(470): Config changes=1df8 {1.0 ?mcc?mnc en_US ldltr sw1080dp w1920dp h1080dp 160dpi xlrg long land ?uimode ?night -touch -keyb/v/h -nav/h s.2}
I/ActivityManager(470): Config changes=400 {1.0 ?mcc?mnc en_US ldltr sw1080dp w1920dp h1007dp 160dpi xlrg long land ?uimode ?night -touch -keyb/v/h -nav/h s.3}
I/ActivityManager(470): Config changes=200 {1.0 ?mcc?mnc en_US ldltr sw1080dp w1920dp h1007dp 160dpi xlrg long land -touch -keyb/v/h -nav/h s.4}
D/Environment(470): screen raw size:1920,1080
I/ActivityManager(470): Config changes=60 {1.0 ?mcc?mnc en_US ldltr sw1080dp w1920dp h1007dp 160dpi xlrg long land -touch -keyb/v/h dpad/v s.5}
D/Environment(470): screen raw size:1920,1080
D/Environment(470): screen raw size:1920,1080
D/DisplayOutputManager(470): setDisplaySize 0 1920 1080
D/Displaymanager(138): switchFramebuffer display 0 new res is x 1920 y 1080
D/DisplayDeviceManagementService(470): send cmd utils switchfb 0 1920x1080
貌似是进入ui 后 才强制到1080p.
额，我的意思是这个sdk上的android上层displaymanager 做了限制。不是说android原生的限制。
试一下在frameworks/base/services/java/com/android/server/wm/WindowManagerService.java
public void displayReady() {
displayReady(Display.DEFAULT_DISPLAY);
synchronized(mWindowMap) {
final DisplayContent displayContent = getDefaultDisplayContentLocked();
readForcedDisplaySizeAndDensityLocked(displayContent);
mDisplayReady = true;
}
try {
mActivityManager.updateConfiguration(null);
} catch (RemoteException e) {
}
synchronized(mWindowMap) {
mIsTouchDevice = mContext.getPackageManager().hasSystemFeature(
PackageManager.FEATURE_TOUCHSCREEN);
configureDisplayPolicyLocked(getDefaultDisplayContentLocked());
}
try {
mActivityManager.updateConfiguration(null);
} catch (RemoteException e) {
}
}
注释掉
readForcedDisplaySizeAndDensityLocked(displayContent);
貌似就是这里强制成1080p了。
private void readForcedDisplaySizeAndDensityLocked(final DisplayContent displayContent) {
//$_rbox_$_modify_$_qiuen begin,add switch framebuffer size
String displaypolicy = SystemProperties.get("persist.sys.display.policy", "manual");
if (displaypolicy.equals("auto") == true) {
Point ssize= new Point();
synchronized(displayContent.mDisplaySizeLock) {
ssize.x = displayContent.mBaseDisplayWidth;
ssize.y = displayContent.mBaseDisplayHeight;
}
getCurScreenSize(Display.DEFAULT_DISPLAY, ssize);
Slog.d("qiuen", ">>>CURRENT DISPLAY SIZE: " + ssize.x + "x" + ssize.y);
synchronized(displayContent.mDisplaySizeLock) {
if (displayContent.mBaseDisplayWidth != ssize.x
|| displayContent.mBaseDisplayHeight != ssize.y) {
Slog.i("qiuen", "FORCED DISPLAY SIZE: " + ssize.x + "x" + ssize.y);
displayContent.mBaseDisplayWidth = ssize.x;
displayContent.mBaseDisplayHeight = ssize.y;
}
}
//$_rbox_$_modify_$_end
}else{
String sizeStr = Settings.Global.getString(mContext.getContentResolver(),
Settings.Global.DISPLAY_SIZE_FORCED);
if (sizeStr == null || sizeStr.length() == 0) {
sizeStr = SystemProperties.get(SIZE_OVERRIDE, null);
}
if (sizeStr != null && sizeStr.length() > 0) {
final int pos = sizeStr.indexOf(',');
if (pos > 0 && sizeStr.lastIndexOf(',') == pos) {
int width, height;
try {
width = Integer.parseInt(sizeStr.substring(0, pos));
height = Integer.parseInt(sizeStr.substring(pos+1));
synchronized(displayContent.mDisplaySizeLock) {
if (displayContent.mBaseDisplayWidth != width
|| displayContent.mBaseDisplayHeight != height) {
Slog.i(TAG, "FORCED DISPLAY SIZE: " + width + "x" + height);
displayContent.mBaseDisplayWidth = width;
displayContent.mBaseDisplayHeight = height;
}
}
} catch (NumberFormatException ex) {
}
}
}
}
String densityStr = Settings.Global.getString(mContext.getContentResolver(),
Settings.Global.DISPLAY_DENSITY_FORCED);
if (densityStr == null || densityStr.length() == 0) {
densityStr = SystemProperties.get(DENSITY_OVERRIDE, null);
}
if (densityStr != null && densityStr.length() > 0) {
int density;
try {
density = Integer.parseInt(densityStr);
synchronized(displayContent.mDisplaySizeLock) {
if (displayContent.mBaseDisplayDensity != density) {
Slog.i(TAG, "FORCED DISPLAY DENSITY: " + density);
displayContent.mBaseDisplayDensity = density;
}
}
} catch (NumberFormatException ex) {
}
}
}
win1:
state:1, fmt:ARGB888, y_vir:3840, uv_vir:0
xact:3840, yact:2160, dsp_x:3840, dsp_y:2160, x_st: 0, y_st: 0
y_h_fac: 4096, y_v_fac: 4096, uv_h_fac: 4096, uv_v_fac: 4096
y_addr: 0x13f48000, uv_addr:0x00000000
楼上正解。亲测有效！
确实如此，那个 里面那个 getCurScreenSize 读 /sys/class/graphic/fb0/disp_info 过滤了 1080 以上的
测试发现只修改 getCurScreenSize 还不够，切换分辨率之后回不到4k，原来
frameworks/base/core/java/android/os/DisplayOutputManager.java 中 setMode 也限制了1080p
修改后切换分辨率回4k正常
if (n <= 720){
m = 1280;
n = 720;
} else if (n > 2160) {
m = 1920;
n = 1080;
} else if ( (m==3840&&n==2160)|| (m==1920&&n==1080)||(m == 1680 && n == 1050) ||(m == 1600 && n == 900) || (m == 1440 && n == 900) || (m == 1366 && n == 768)|| (m == 1024 && n == 768)|| (m == 800 && n == 600)) {
//Oh no
;
} else {
m = 1280;
n = 720;
}
有人试过Linux下HDMI输出2560x1080分辨率么？
ubuntu上hdmi输出4K （3840*2160）都没问题的。2560*1080应该也没问题的。改下驱动就可以的。楼上可以自己试下。
connet 发表于 2014-11-24 17:36
测试发现只修改 getCurScreenSize 还不够，切换分辨率之后回不到4k，原来
frameworks/base/core/java/andr ...
前辈，我想在安卓系统里增加2560*1440的分辨率跟1440*2560分辨率，我有个VR眼镜必须指定这个分辨率才能点亮，我刚刚接触开发板这个东西，对安卓以前是一窍不通，能否指点一下增加以上两个分辨率的具体办法？感激不尽。
本帖最后由 萧瑶 于 2015-9-18 06:07 编辑
connet 发表于 2014-11-24 17:36
测试发现只修改 getCurScreenSize 还不够，切换分辨率之后回不到4k，原来
frameworks/base/core/java/andr ...
cht2能否直接帮忙把原系统必须修改的两个地方的代码直接修改后提供一下我自己研究怎么去替换。因为以我现在的水平要直接自己编译代码的话距离还很遥远。