安卓11上调双屏异显功能，系统驱动默认支持双背光功能，老一点的系统不支持双背光驱动，所以老版本的双屏异显都是同时控制2个屏的背光，客户也没做特别要求，新版本客户有这个需求了，所以就想办法去实现；底层已经出现了2个背光节点，但是上层就没有做这个功能，硬件上2个背光也是分开的，默认双屏点亮后系统只能调默认原生的那个背光，自己修改节点的背光要想办法去实现，不说了，直接上货：
1.从系统状态栏滑竿调整背光的代码开始追起，
frameworks/base/packages/SystemUI/src/com/android/systemui/settings/BrightnessController.java
public void onChanged(ToggleSlider toggleSlider, boolean tracking, boolean automatic,
int value, boolean stopTracking) ->
final float valFloat = convertGammaToLinearFloat(value,
minBacklight, maxBacklight);
if (stopTracking) {
// TODO(brightnessfloat): change to use float value instead.
MetricsLogger.action(mContext, metric,
BrightnessSynchronizer.brightnessFloatToInt(mContext, valFloat));
}
setBrightness(valFloat);
private void setBrightness(float brightness) {
mDisplayManager.setTemporaryBrightness(brightness);
}
->
frameworks/base/core/java/android/hardware/display/DisplayManager.java
public void setTemporaryBrightness(float brightness) {
mGlobal.setTemporaryBrightness(brightness);
}
->
frameworks/base/core/java/android/hardware/display/DisplayManagerGlobal.java
public void setTemporaryBrightness(float brightness) {
try {
mDm.setTemporaryBrightness(brightness);
} catch (RemoteException ex) {
throw ex.rethrowFromSystemServer();
}
}
2.中间代码有兴趣的自己追，我不追了，最终会调用到hal层里面，修改补丁如下：文章来源：https://www.toymoban.com/news/detail-756479.html
Index: hardware/rockchip/light_aidl/Android.bp
===================================================================
--- hardware/rockchip/light_aidl/Android.bp (revision 844)
+++ hardware/rockchip/light_aidl/Android.bp (working copy)
@@ -7,6 +7,7 @@
shared_libs: [
"libbase",
"liblog",
+ "libcutils", //加这个是为了在cpp文件调用property接口
"libbinder_ndk",
"android.hardware.light-ndk_platform",
],
Index: hardware/rockchip/light_aidl/Lights.cpp
===================================================================
--- hardware/rockchip/light_aidl/Lights.cpp (revision 844)
+++ hardware/rockchip/light_aidl/Lights.cpp (working copy)
@@ -23,6 +23,7 @@
#include <aidl/android/hardware/light/LightType.h>
#include <aidl/android/hardware/light/FlashMode.h>
+#include <cutils/properties.h>
using namespace std;
@@ -54,9 +55,19 @@
}
const char* getDriverPath(LightType type) {
+
+
switch (type) {
case LightType::BACKLIGHT:
- return "/sys/class/backlight/backlight/brightness";
+ char value[PROPERTY_VALUE_MAX];
+ property_get("persist.sys.backlight", value, "");
+
+ if(!strcmp(value,"1")){
+ return "/sys/class/backlight/backlight1/brightness";
+ }
+ else{
+ return "/sys/class/backlight/backlight/brightness";
+ }
case LightType::BUTTONS:
return "/sys/class/leds/button-backlight/brightness";
case LightType::BATTERY:
仅仅按上面改还有个问题，就是背光设置完再切换另一个背光亮度的控制条时候，进度条显示的时钟是上一次进度条设置的值，就是亮度进度条没有反应正确的亮度值，要完美适配各自的亮度进度条指示，修改如下：文章来源地址https://www.toymoban.com/news/detail-756479.html
Index: frameworks/base/packages/SystemUI/src/com/android/systemui/settings/BrightnessController.java
===================================================================
--- frameworks/base/packages/SystemUI/src/com/android/systemui/settings/BrightnessController.java (revision 855)
+++ frameworks/base/packages/SystemUI/src/com/android/systemui/settings/BrightnessController.java (working copy)
@@ -47,6 +47,8 @@
import com.android.settingslib.RestrictedLockUtilsInternal;
import com.android.systemui.Dependency;
import com.android.systemui.broadcast.BroadcastDispatcher;
+import android.os.SystemProperties;
+import android.os.yx.YxDeviceManager;
import java.util.ArrayList;
@@ -82,6 +84,7 @@
private final DisplayManager mDisplayManager;
private final CurrentUserTracker mUserTracker;
private final IVrManager mVrManager;
+ private YxDeviceManager yx;
private final Handler mBackgroundHandler;
private final BrightnessObserver mBrightnessObserver;
@@ -96,6 +99,7 @@
private boolean mControlValueInitialized;
private ValueAnimator mSliderAnimator;
+ private int readBrightness= 0;
public interface BrightnessStateChangeCallback {
public void onBrightnessLevelChanged();
@@ -116,7 +120,7 @@
@Override
public void onChange(boolean selfChange, Uri uri) {
if (selfChange) return;
-
+ Log.i("fan","onBrightnessLevel Changed");
if (BRIGHTNESS_MODE_URI.equals(uri)) {
mBackgroundHandler.post(mUpdateModeRunnable);
mBackgroundHandler.post(mUpdateSliderRunnable);
@@ -238,6 +242,16 @@
public void run() {
final float valFloat;
final boolean inVrMode = mIsVrModeEnabled;
+ int mbacklight = SystemProperties.getInt("persist.sys.backlight",0);
+
+ /* if(mbacklight==1){
+ Settings.System.putInt(mContext.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, yx.getSystemBrightnessExtend());
+ Log.i("fan","backlight-1 brightness="+yx.getSystemBrightnessExtend());
+ }
+ else{
+ Log.i("fan","backlight brightness="+yx.getSystemBrightness());
+ Settings.System.putInt(mContext.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, yx.getSystemBrightness());
+ }*/
if (inVrMode) {
valFloat = Settings.System.getFloatForUser(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_FOR_VR_FLOAT, mDefaultBacklightForVr,
@@ -297,10 +311,12 @@
mContext = context;
mControl = control;
mControl.setMax(GAMMA_SPACE_MAX);
+ yx = YxDeviceManager.getInstance(context);
mBackgroundHandler = new Handler((Looper) Dependency.get(Dependency.BG_LOOPER));
mUserTracker = new CurrentUserTracker(broadcastDispatcher) {
@Override
- public void onUserSwitched(int newUserId) {
+ public void onUserSwitched(int newUserId) {
+ Log.i("fan","onUserSwitched");
mBackgroundHandler.post(mUpdateModeRunnable);
mBackgroundHandler.post(mUpdateSliderRunnable);
}
@@ -356,7 +372,7 @@
public void onChanged(ToggleSlider toggleSlider, boolean tracking, boolean automatic,
int value, boolean stopTracking) {
if (mExternalChange) return;
-
+ Log.i("fan","ToggleSlider onChanged");
if (mSliderAnimator != null) {
mSliderAnimator.cancel();
}
@@ -434,7 +450,8 @@
private void updateSlider(float brightnessValue, boolean inVrMode) {
final float min;
- final float max;
+ final float max;
+ float result;
if (inVrMode) {
min = mMinimumBacklightForVr;
max = mMaximumBacklightForVr;
@@ -450,14 +467,31 @@
return;
}
// Returns GAMMA_SPACE_MIN - GAMMA_SPACE_MAX
- final int sliderVal = convertLinearToGammaFloat(brightnessValue, min, max);
- animateSliderTo(sliderVal);
+ //Log.i("fan","read brightnessValue="+brightnessValue+"min="+min+"max="+max);
+ int mbacklight = SystemProperties.getInt("persist.sys.backlight",0);
+ if(mbacklight==1){
+ readBrightness= yx.getSystemBrightnessExtend();
+ //Log.i("fan","backlight-1 brightness="+readBrightness);
+ }
+ else{
+ readBrightness= yx.getSystemBrightness();
+ //Log.i("fan","backlight brightness="+readBrightness);
+ }
+ result = (float)(readBrightness/255.0000f);
+ //Log.i("fan","send brightnessValue="+brightnessValue);
+ //brightnessValue = result;
+ //Log.i("fan","read brightnessValue="+result);
+ final int sliderVal = convertLinearToGammaFloat(result, min, max);
+
+ //Log.i("fan","read sliderVal="+sliderVal);
+
+ animateSliderTo(sliderVal);
}
private void animateSliderTo(int target) {
if (!mControlValueInitialized) {
// Don't animate the first value since its default state isn't meaningful to users.
- mControl.setValue(target);
+ mControl.setValue(target);
mControlValueInitialized = true;
}
if (mSliderAnimator != null && mSliderAnimator.isStarted()) {
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