Android(安卓)显示刷新频率的实现代码

Android 显示刷新频率

android11-release

开发者选项->显示刷新频率

packages/apps/Settings/src/com/android/settings/development/ShowRefreshRatePreferenceController.java

调用 SurfaceFlinger::onTransact 中 1034 方法
updateShowRefreshRateSetting() 通过 SurfaceFlinger 获取 mRefreshRateOverlay != nullptr 判断显示是否打开
writeShowRefreshRateSetting(boolean isEnabled) 设置打开显示刷新频率

public class ShowRefreshRatePreferenceController extends DeveloperOptionsPreferenceController        implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin {    private static final String SHOW_REFRESH_RATE_KEY = "show_refresh_rate";    private static final int SETTING_VALUE_QUERY = 2;    private static final int SETTING_VALUE_ON = 1;    private static final int SETTING_VALUE_OFF = 0;    @VisibleForTesting    static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger";    @VisibleForTesting    static final int SURFACE_FLINGER_CODE = 1034;    private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer";    private final IBinder mSurfaceFlinger;    public ShowRefreshRatePreferenceController(Context context) {        super(context);        mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY);    }    @Override    public String getPreferenceKey() {        return SHOW_REFRESH_RATE_KEY;    }    @Override    public boolean onPreferenceChange(Preference preference, Object newValue) {        final boolean isEnabled = (Boolean) newValue;        writeShowRefreshRateSetting(isEnabled);        return true;    }    @Override    public void updateState(Preference preference) {        updateShowRefreshRateSetting();    }    @Override    protected void onDeveloperOptionsSwitchDisabled() {        super.onDeveloperOptionsSwitchDisabled();        final SwitchPreference preference = (SwitchPreference) mPreference;        if (preference.isChecked()) {            // Writing false to the preference when the setting is already off will have a            // side effect of turning on the preference that we wish to avoid            writeShowRefreshRateSetting(false);            preference.setChecked(false);        }    }    @VisibleForTesting    void updateShowRefreshRateSetting() {        // magic communication with surface flinger.        try {            if (mSurfaceFlinger != null) {                final Parcel data = Parcel.obtain();                final Parcel reply = Parcel.obtain();                data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);                data.writeInt(SETTING_VALUE_QUERY);                mSurfaceFlinger.transact(SURFACE_FLINGER_CODE, data, reply, 0 /* flags */);                final boolean enabled = reply.readBoolean();                ((SwitchPreference) mPreference).setChecked(enabled);                reply.recycle();                data.recycle();            }        } catch (RemoteException ex) {            // intentional no-op        }    }    @VisibleForTesting    void writeShowRefreshRateSetting(boolean isEnabled) {        try {            if (mSurfaceFlinger != null) {                final Parcel data = Parcel.obtain();                data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);                final int showRefreshRate = isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF;                data.writeInt(showRefreshRate);                mSurfaceFlinger.transact(SURFACE_FLINGER_CODE, data,                        null /* reply */, 0 /* flags */);                data.recycle();            }        } catch (RemoteException ex) {            // intentional no-op        }        updateShowRefreshRateSetting();    }}

RefreshRateOverlay 实际Layer显示刷新频率

frameworks\native\services\surfaceflinger\SurfaceFlinger.cppframeworks\native\services\surfaceflinger\RefreshRateOverlay.cpp

初始化 RefreshRateOverlay，通过 SurfaceFlinger createLayer显示

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