城市建设学校网站管理规章制度,wordpress站点设置使用时间,wordpress 双语网站,泉州网络公司通常未通过特殊定制的 Android 系统#xff0c;截屏都是经过同时按住音量下键和电源键来截屏。本篇文章就只讨论使用这些特殊按键来进行截屏。 这里我们就要明白事件是在哪里进行分发拦截的。通过源码的分析#xff0c;我们发现是在PhoneWindowManager.java 中。 PhoneWindow…通常未通过特殊定制的 Android 系统截屏都是经过同时按住音量下键和电源键来截屏。本篇文章就只讨论使用这些特殊按键来进行截屏。 这里我们就要明白事件是在哪里进行分发拦截的。通过源码的分析我们发现是在PhoneWindowManager.java 中。 PhoneWindowManager#interceptKeyBeforeQueueing() frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java Overridepublic int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {if (!mSystemBooted) {// If we have not yet booted, dont let key events do anything.return 0;}// 省略部分代码......// Handle special keys.switch (keyCode) {......case KeyEvent.KEYCODE_VOLUME_DOWN:case KeyEvent.KEYCODE_VOLUME_UP:case KeyEvent.KEYCODE_VOLUME_MUTE: {// 按下音量键调用handleVolumeKey(event, policyFlags);......break;}......case KeyEvent.KEYCODE_POWER: {......if (down) {// 按下电源键将调用interceptPowerKeyDown(event, interactive);} else { interceptPowerKeyUp(event, interactive, canceled);}break;}}return result;}1、电源键处理
PhoneWindowManager#interceptPowerKeyDown() frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java private void interceptPowerKeyDown(KeyEvent event, boolean interactive) {// 省略部分代码......// Latch power key state to detect screenshot chord.if (interactive !mScreenshotChordPowerKeyTriggered (event.getFlags() KeyEvent.FLAG_FALLBACK) 0) {// power键按下的标志mScreenshotChordPowerKeyTriggered true;// 获取 Power 键的触发时间mScreenshotChordPowerKeyTime event.getDownTime();// 处理屏幕截图事件interceptScreenshotChord();// 这个方法应该是消耗、拦截事件的避免改变音量、铃声等。interceptRingerToggleChord();}// 省略部分代码......}interceptScreenshotChord()该方法下面再说先介绍电源按键、音量按键的处理。
2、音量键处理
PhoneWindowManager#handleVolumeKey() frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java public void handleVolumeKey(KeyEvent event, int policyFlags) {final boolean down event.getAction() KeyEvent.ACTION_DOWN;final int keyCode event.getKeyCode();final boolean interactive (policyFlags FLAG_INTERACTIVE) ! 0;if (keyCode KeyEvent.KEYCODE_VOLUME_DOWN) {if (down) {// Any activity on the vol down button stops the ringer toggle shortcutcancelPendingRingerToggleChordAction();if (interactive !mScreenshotChordVolumeDownKeyTriggered (event.getFlags() KeyEvent.FLAG_FALLBACK) 0) {// Volume键按下的标志mScreenshotChordVolumeDownKeyTriggered true;// 获取 Volume 键的触发时间mScreenshotChordVolumeDownKeyTime event.getDownTime();// 赋值 false 该属性为了防止截屏的时候音量下键生效出现调节音量的 dialog 状态值mScreenshotChordVolumeDownKeyConsumed false;// 防止触发 Power 键长按功能cancelPendingPowerKeyAction();//处理屏幕截图事件interceptScreenshotChord();// 拦截相关快捷键interceptAccessibilityShortcutChord();}} else {// 省略部分代码......}} else if (keyCode KeyEvent.KEYCODE_VOLUME_UP) {// 省略部分代码......}return;}3、截屏事件处理 interceptScreenshotChord()
PhoneWindowManager#interceptScreenshotChord() frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java private void interceptScreenshotChord() {/** if 判断参数介绍* mScreenshotChordEnabled 其值为mContext.getResources().getBoolean(com.android.internal.R.bool.config_enableScreenshotChord);* mScreenshotChordVolumeDownKeyTriggered 音量下键按下时值为true* mScreenshotChordPowerKeyTriggered 电源键按下时值为true* mA11yShortcutChordVolumeUpKeyTriggered 音量上(加)键抬起时为false , 按下时为true**/if (mScreenshotChordEnabled mScreenshotChordVolumeDownKeyTriggered mScreenshotChordPowerKeyTriggered !mA11yShortcutChordVolumeUpKeyTriggered) {// 获取当前时间final long now SystemClock.uptimeMillis();// 当前时间小于 音量下键按下时间 150ms// 当前时间小于 power键按下时间 150msif (now mScreenshotChordVolumeDownKeyTime SCREENSHOT_CHORD_DEBOUNCE_DELAY_MILLIS now mScreenshotChordPowerKeyTime SCREENSHOT_CHORD_DEBOUNCE_DELAY_MILLIS) {boolean inLongScreenshot Settings.System.getIntForUser(mContext.getContentResolver(),LONGSCREENSHOT_SETTING, 0, UserHandle.USER_CURRENT_OR_SELF) 1;if (hasInPowerUtrlSavingMode() || inLongScreenshot) {return;}// 长按音量下键达到截屏条件将该事件消费掉。mScreenshotChordVolumeDownKeyConsumed true;// 防止触发 Power 键长按功能cancelPendingPowerKeyAction();// 设置截图的类型TAKE_SCREENSHOT_FULLSCREEN 为全屏mScreenshotRunnable.setScreenshotType(TAKE_SCREENSHOT_FULLSCREEN);// 截图的方式(例如按键、三指下滑 等等)mScreenshotRunnable.setScreenshotSource(SCREENSHOT_KEY_CHORD);//执行 mScreenshotRunnablemHandler.postDelayed(mScreenshotRunnable, getScreenshotChordLongPressDelay());}}}继续查看ScreenshotRunnable此时会一步步向下调用最终到SystemUI。 frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java private class ScreenshotRunnable implements Runnable {private int mScreenshotType TAKE_SCREENSHOT_FULLSCREEN;private int mScreenshotSource SCREENSHOT_KEY_OTHER;public void setScreenshotType(int screenshotType) {mScreenshotType screenshotType;}public void setScreenshotSource(int screenshotSource) {mScreenshotSource screenshotSource;}Overridepublic void run() {// 回调到 DisplayPolicy.javamDefaultDisplayPolicy.takeScreenshot(mScreenshotType, mScreenshotSource);}}DisplayPolicy#takeScreenshot() frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java // 请求截取屏幕截图public void takeScreenshot(int screenshotType, int source) {if (mScreenshotHelper ! null) {mScreenshotHelper.takeScreenshot(screenshotType,mStatusBar ! null mStatusBar.isVisibleLw(),mNavigationBar ! null mNavigationBar.isVisibleLw(),source, mHandler, null /* completionConsumer */);}}继续往下看ScreenshotHelper#takeScreenshot() frameworks/base/core/java/com/android/internal/util/ScreenshotHelper.java // 请求截取屏幕截图public void takeScreenshot(final int screenshotType, final boolean hasStatus,final boolean hasNav, int source, NonNull Handler handler,Nullable ConsumerUri completionConsumer) {ScreenshotRequest screenshotRequest new ScreenshotRequest(source, hasStatus, hasNav);takeScreenshot(screenshotType, SCREENSHOT_TIMEOUT_MS, handler, screenshotRequest,completionConsumer);}//到了 Binder调用环节, 此为客户端, 服务端为SystemUI中的 TakeScreenshotServiceprivate void takeScreenshot(final int screenshotType, long timeoutMs, NonNull Handler handler,ScreenshotRequest screenshotRequest, Nullable ConsumerUri completionConsumer) {synchronized (mScreenshotLock) {final Runnable mScreenshotTimeout () - {synchronized (mScreenshotLock) {if (mScreenshotConnection ! null) {// 在获取屏幕截图捕获响应之前超时Log.e(TAG, Timed out before getting screenshot capture response);// 重置连接resetConnection();// 通知截屏错误notifyScreenshotError();}}if (completionConsumer ! null) {completionConsumer.accept(null);}};Message msg Message.obtain(null, screenshotType, screenshotRequest);Handler h new Handler(handler.getLooper()) {Overridepublic void handleMessage(Message msg) {switch (msg.what) {case SCREENSHOT_MSG_URI:if (completionConsumer ! null) {completionConsumer.accept((Uri) msg.obj);}handler.removeCallbacks(mScreenshotTimeout);break;case SCREENSHOT_MSG_PROCESS_COMPLETE:synchronized (mScreenshotLock) {resetConnection();}break;}}};msg.replyTo new Messenger(h);if (mScreenshotConnection null || mScreenshotService null) {// 一个标准的Service连接// config_screenshotServiceComponent com.android.systemui/com.android.systemui.screenshot.TakeScreenshotServicefinal ComponentName serviceComponent ComponentName.unflattenFromString(mContext.getResources().getString(com.android.internal.R.string.config_screenshotServiceComponent));final Intent serviceIntent new Intent();serviceIntent.setComponent(serviceComponent);ServiceConnection conn new ServiceConnection() {Override// 当Service连接成功之后public void onServiceConnected(ComponentName name, IBinder service) {synchronized (mScreenshotLock) {if (mScreenshotConnection ! this) {return;}mScreenshotService service;Messenger messenger new Messenger(mScreenshotService);try {messenger.send(msg);} catch (RemoteException e) {Log.e(TAG, Couldnt take screenshot: e);if (completionConsumer ! null) {completionConsumer.accept(null);}}}}Override// 当Service断开连接时public void onServiceDisconnected(ComponentName name) {synchronized (mScreenshotLock) {if (mScreenshotConnection ! null) {resetConnection();// only log an error if were still within the timeout periodif (handler.hasCallbacks(mScreenshotTimeout)) {handler.removeCallbacks(mScreenshotTimeout);notifyScreenshotError();}}}}};// bindServiceif (mContext.bindServiceAsUser(serviceIntent, conn,Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE,UserHandle.CURRENT)) {mScreenshotConnection conn;handler.postDelayed(mScreenshotTimeout, timeoutMs);}} else {// 如果已经连接则直接发送MessageMessenger messenger new Messenger(mScreenshotService);try {messenger.send(msg);} catch (RemoteException e) {Log.e(TAG, Couldnt take screenshot: e);if (completionConsumer ! null) {completionConsumer.accept(null);}}handler.postDelayed(mScreenshotTimeout, timeoutMs);}}}客户端通过向服务端发送 message 来将截屏任务交给 service由 service 处理后面的操作。 frameworks/base/packages/SystemUI/src/com/android/systemui/screenshot/TakeScreenshotService.java private Handler mHandler new Handler(Looper.myLooper()) {Overridepublic void handleMessage(Message msg) {// 获取客户端传的 Messenger 对象final Messenger callback msg.replyTo;ConsumerUri uriConsumer uri - {Message reply Message.obtain(null, SCREENSHOT_MSG_URI, uri);try {/ /Messenger 双向通信在服务端用远程客户端的 Messenger 对象给客户端发送信息callback.send(reply);} catch (RemoteException e) {}};Runnable onComplete () - {Message reply Message.obtain(null, SCREENSHOT_MSG_PROCESS_COMPLETE);try {callback.send(reply);} catch (RemoteException e) {}};// 判断用户的设备是否为解锁状态// 如果用户的存储被锁定我们没有地方存储截图所以跳过它而不是显示一个误导性的动画和错误通知。if (!mUserManager.isUserUnlocked()) {Log.w(TAG, Skipping screenshot because storage is locked!);post(() - uriConsumer.accept(null));post(onComplete);return;}ScreenshotHelper.ScreenshotRequest screenshotRequest (ScreenshotHelper.ScreenshotRequest) msg.obj;mUiEventLogger.log(ScreenshotEvent.getScreenshotSource(screenshotRequest.getSource()));switch (msg.what) {case WindowManager.TAKE_SCREENSHOT_FULLSCREEN: // 全屏截图// 我们在PhoneWindowManager传入的type为全屏截图,所以需要执行全屏截图流程mScreenshot.takeScreenshot(uriConsumer, onComplete);break;case WindowManager.TAKE_SCREENSHOT_SELECTED_REGION: // 区域截图mScreenshot.takeScreenshot(uriConsumer, onComplete);break;case WindowManager.TAKE_SCREENSHOT_PROVIDED_IMAGE:Bitmap screenshot BitmapUtil.bundleToHardwareBitmap(screenshotRequest.getBitmapBundle());Rect screenBounds screenshotRequest.getBoundsInScreen();Insets insets screenshotRequest.getInsets();int taskId screenshotRequest.getTaskId();int userId screenshotRequest.getUserId();ComponentName topComponent screenshotRequest.getTopComponent();mScreenshot.handleImageAsScreenshot(screenshot, screenBounds, insets,taskId, userId, topComponent, uriConsumer, onComplete);break;default:Log.d(TAG, Invalid screenshot option: msg.what);}}};TakeScreenshotService调用GlobalScreenshot.java的takeScreenshot() GlobalScreenshot#takeScreenshot()
// GlobalScreenshot.java/***截取当前显示的屏幕截图并显示动画。.*/private void takeScreenshot(ConsumerUri finisher, Rect crop) {// copy the input Rect, since SurfaceControl.screenshot can mutate itRect screenRect new Rect(crop);int rot mDisplay.getRotation();int width crop.width();int height crop.height();takeScreenshot(SurfaceControl.screenshot(crop, width, height, rot), finisher, screenRect,Insets.NONE, true);}private void takeScreenshot(Bitmap screenshot, ConsumerUri finisher, Rect screenRect,Insets screenInsets, boolean showFlash) {// 此方法会清除上一次的截图信息--连续截图行为dismissScreenshot(new screenshot requested, true);mScreenBitmap screenshot;if (mScreenBitmap null) {// 如果没有Bitmap则报告错误信息mNotificationsController.notifyScreenshotError(R.string.screenshot_failed_to_capture_text);finisher.accept(null);mOnCompleteRunnable.run();return;}if (!isUserSetupComplete()) {// 用户设置尚未完成,不应该向用户展示 分享和编辑 , 只显示一个Toast并保存图片saveScreenshotAndToast(finisher);return;}// OptimizationsmScreenBitmap.setHasAlpha(false);mScreenBitmap.prepareToDraw();onConfigChanged(mContext.getResources().getConfiguration());if (mDismissAnimation ! null mDismissAnimation.isRunning()) {mDismissAnimation.cancel();}// 获取焦点setWindowFocusable(true);// 开始截图后动画startAnimation(finisher, screenRect, screenInsets, showFlash);}/*** 截屏后开始动画*/private void startAnimation(final ConsumerUri finisher, Rect screenRect, Insets screenInsets,boolean showFlash) {if (mScreenshotIng false) {//unisoc: Modify for bug1360276mScreenshotIng true;// 如果开启了省电模式显示 toast以便有一些视觉提示已截取屏幕截图PowerManager powerManager (PowerManager) mContext . getSystemService (Context.POWER_SERVICE);if (powerManager.isPowerSaveMode()) {Toast.makeText(mContext, R.string.screenshot_saved_title, Toast.LENGTH_SHORT).show();}mScreenshotHandler.post(() - {if (!mScreenshotLayout.isAttachedToWindow()) {// mScreenshotLayout是截屏的缩略图的父View// mScreenshotLayout 在 GlobalScreenshot.java 的构造方法中初始化。对应布局文件global_screenshot.xmlmWindowManager.addView(mScreenshotLayout, mWindowLayoutParams);}// 动画相关的ViewmScreenshotAnimatedView.setImageDrawable(createScreenDrawable(mScreenBitmap, screenInsets));setAnimatedViewSize(screenRect.width(), screenRect.height());// 显示动画何时开始mScreenshotAnimatedView.setVisibility(View.GONE);//缩略图显示的View,将native层返回的Bitmap加载到此View上mScreenshotPreview.setImageDrawable(createScreenDrawable(mScreenBitmap, screenInsets));// 使静态预览不可见消失以便我们可以在屏幕上查询其位置mScreenshotPreview.setVisibility(View.INVISIBLE);mScreenshotHandler.post(() - {mScreenshotLayout.getViewTreeObserver().addOnComputeInternalInsetsListener(this);// 创建动画mScreenshotAnimation createScreenshotDropInAnimation(screenRect, showFlash);// 保存截图saveScreenshotInWorkerThread(finisher, new ActionsReadyListener () {Overridevoid onActionsReady (SavedImageData imageData) {showUiOnActionsReady(imageData);mScreenshotIng false;}});// 播放快门声音以通知我们已截屏mCameraSound.play(MediaActionSound.SHUTTER_CLICK);if (mScreenshotPreview.isAttachedToWindow()) {mScreenshotPreview.setLayerType(View.LAYER_TYPE_HARDWARE, null);mScreenshotPreview.buildLayer();}// 开始执行动画mScreenshotAnimation.start();});});}}/*** 创建一个新的工作线程并将屏幕截图保存到媒体存储*/private void saveScreenshotInWorkerThread(ConsumerUri finisher, Nullable ActionsReadyListener actionsReadyListener) {SaveImageInBackgroundData data new SaveImageInBackgroundData();data.image mScreenBitmap; // native 层返回的 Bitmapdata.finisher finisher;data.mActionsReadyListener actionsReadyListener;if (mSaveInBgTask ! null) {// just log success/failure for the pre-existing screenshot// 只需记录预先存在的屏幕截图的成功失败mSaveInBgTask.setActionsReadyListener(new ActionsReadyListener() {Overridevoid onActionsReady(SavedImageData imageData) {logSuccessOnActionsReady(imageData);}});}// 截图的一些信息存储在 SaveImageInBackgroundTask 中构建mSaveInBgTask new SaveImageInBackgroundTask(mContext, data);mSaveInBgTask.execute();}到此截屏流程完毕,可以查看下截图的View的xml文件global_screenshot.xml frameworks/base/packages/SystemUI/res/layout/global_screenshot.xml
FrameLayoutxmlns:androidhttp://schemas.android.com/apk/res/androidandroid:idid/global_screenshot_frameandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentImageViewandroid:idid/global_screenshot_actions_backgroundandroid:layout_heightdimen/screenshot_bg_protection_heightandroid:layout_widthmatch_parentandroid:layout_gravitybottomandroid:alpha0.0android:srcdrawable/screenshot_actions_background_protection/!--截屏动画相关的View --ImageViewandroid:idid/global_screenshot_animated_viewandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:layout_gravitytop|startandroid:visibilitygoneandroid:elevationdimen/screenshot_preview_elevationandroid:backgrounddrawable/screenshot_rounded_corners /ImageViewandroid:idid/global_screenshot_flashandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:visibilitygoneandroid:elevationdimen/screenshot_preview_elevationandroid:srcandroid:color/white/com.android.systemui.screenshot.ScreenshotSelectorViewandroid:idid/global_screenshot_selectorandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:visibilitygoneandroid:pointerIconcrosshair/!-- 此处包含了一个layout, 而缩略图的View就在此layout中截屏右上角的关闭缩略图按钮 也在此layout中 --include layoutlayout/global_screenshot_static/
/FrameLayout
