Android副屏锁屏界面-Android14

Android 镜像模式和扩展模式区别探讨-Android14

1、副屏锁屏界面模式

属于 扩展模式 ，非镜像模式。LogicalDisplay.java#configureDisplayLocked 添加日志显示mHasContent=true，表明副屏添加了单独的界面。

2、副屏锁屏界面

SystemUI中KeyguardDisplayManager.java里 isKeyguardShowable 判断锁屏界面是否添加KeyguardPresentation；默认主屏DEFAULT_DISPLAY不会添加

frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardDisplayManager.java

private boolean isKeyguardShowable(Display display) {
  if (display == null) {
	  if (DEBUG) Log.i(TAG, "Cannot show Keyguard on null display");
	  return false;
  }
  if (display.getDisplayId() == mDisplayTracker.getDefaultDisplayId()) {
	  if (DEBUG) Log.i(TAG, "Do not show KeyguardPresentation on the default display");
	  return false;
  }
  display.getDisplayInfo(mTmpDisplayInfo);
  if ((mTmpDisplayInfo.flags & Display.FLAG_PRIVATE) != 0) {
	  if (DEBUG) Log.i(TAG, "Do not show KeyguardPresentation on a private display");
	  return false;
  }
  if ((mTmpDisplayInfo.flags & Display.FLAG_ALWAYS_UNLOCKED) != 0) {
	  if (DEBUG) {
		  Log.i(TAG, "Do not show KeyguardPresentation on an unlocked display");
	  }
	  return false;
  }
  if (mKeyguardStateController.isOccluded()
		  && mDeviceStateHelper.isConcurrentDisplayActive(display)) {
	  if (DEBUG) {
		  // When activities with FLAG_SHOW_WHEN_LOCKED are shown on top of Keyguard, the
		  // Keyguard state becomes "occluded". In this case, we should not show the
		  // KeyguardPresentation, since the activity is presenting content onto the
		  // non-default display.
		  Log.i(TAG, "Do not show KeyguardPresentation when occluded and concurrent"
				  + " display is active");
	  }
	  return false;
  }

  return true;
}

/**
* @param display The display to show the presentation on.
* @return {@code true} if a presentation was added.
*         {@code false} if the presentation cannot be added on that display or the presentation
*         was already there.
*/
private boolean showPresentation(Display display) {
  if (!isKeyguardShowable(display)) return false;
  if (DEBUG) Log.i(TAG, "Keyguard enabled on display: " + display);
  final int displayId = display.getDisplayId();
  Presentation presentation = mPresentations.get(displayId);
  if (presentation == null) {
	  final Presentation newPresentation = createPresentation(display);
	  newPresentation.setOnDismissListener(dialog -> {
		  if (newPresentation.equals(mPresentations.get(displayId))) {
			  mPresentations.remove(displayId);
		  }
	  });
	  presentation = newPresentation;
	  try {
		  presentation.show();
	  } catch (WindowManager.InvalidDisplayException ex) {
		  Log.w(TAG, "Invalid display:", ex);
		  presentation = null;
	  }
	  if (presentation != null) {
		  mPresentations.append(displayId, presentation);
		  return true;
	  }
  }
  return false;
}

2.1 添加KeyguardPresentation

KeyguardPresentation继承Presentation，根据副屏对应Display信息 createDisplayContext 创建对应的Context添加对应的副屏上。

frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardDisplayManager.java

KeyguardPresentation createPresentation(Display display) {
    return new KeyguardPresentation(mContext, display, mKeyguardStatusViewComponentFactory);
}

frameworks/base/core/java/android/app/Presentation.java

private static Context createPresentationContext(
        Context outerContext, Display display, int theme, @WindowType int type) {
    if (outerContext == null) {
        throw new IllegalArgumentException("outerContext must not be null");
    }
    if (display == null) {
        throw new IllegalArgumentException("display must not be null");
    }

    Context windowContext = outerContext.createDisplayContext(display)
            .createWindowContext(getWindowType(type, display), null /* options */);
    if (theme == 0) {
        TypedValue outValue = new TypedValue();
        windowContext.getTheme().resolveAttribute(
                com.android.internal.R.attr.presentationTheme, outValue, true);
        theme = outValue.resourceId;
    }
    return new ContextThemeWrapper(windowContext, theme);
}

2.2 副屏同步主屏锁屏界面

副屏同步主屏锁屏界面就不需要显示KeyguardPresentation，需要在KeyguardDisplayManager.java#isKeyguardShowable判断，可以判断display.getDisplayId() > mDisplayTracker.getDefaultDisplayId()副屏返回false不添加界面；这里需要注意 CTS会失败 。