本篇内容介绍了“Android怎么显示刷新频率”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
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.cpp frameworks\native\services\surfaceflinger\RefreshRateOverlay.cpp
初始化 RefreshRateOverlay,通过 SurfaceFlinger createLayer显示
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