Android展示刷新频率的实现代码
发布时间：2021-11-22 14:24:58 所属栏目：大数据 来源：互联网
导读：Android 显示刷新频率 android11-release 在这里插入图片描述 在这里插入图片描述 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 103
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Android 显示刷新频率 android11-release 在这里插入图片描述 在这里插入图片描述 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 frameworksnativeservicessurfaceflingerSurfaceFlinger.cpp frameworksnativeservicessurfaceflingerRefreshRateOverlay.cpp 在这里插入图片描述 在这里插入图片描述 初始化 RefreshRateOverlay，通过 SurfaceFlinger createLayer显示。 （编辑：91站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
