带你了解Android窗口机制Window、PhoneWindow和DecorView之间的关系

public class Activity extends ContextThemeWrappe{ private Window mWindow;}

public class PhoneWindow extends Window{ // This is the top-level view of the window, containing the window decor. private DecorView mDecor; }

public class DecorView extends FrameLayout {}

public abstract class Window { public abstract @Non View getDecorView(); /** * Retrieve the current decor view, but only if it has already been created; * otherwise returns . * * @return Returns the top-level window decor or . * @see #getDecorView */ public abstract View peekDecorView(); public abstract Bundle saveHierarchyState(); public abstract void restoreHierarchyState(Bundle savedInstanceState); protected abstract void onActive(); @able public <T extends View> T findViewById(@IdRes int id) { return getDecorView().findViewById(id); } /** * Convenience for * {@link #setContentView(View, android.view.ViewGroup.LayoutParams)} * to set the screen content from a layout resource. The resource will be * inflated, adding all top-level views to the screen. * * @param layoutResID Resource ID to be inflated. * @see #setContentView(View, android.view.ViewGroup.LayoutParams) */ public abstract void setContentView(@LayoutRes int layoutResID);}

// 当 Window 可见时允许锁屏public static final int FLAG_ALLOW_LOCK_WHILE_SCREEN_ON = 0x00000001;// Window 后面的内容都变暗public static final int FLAG_DIM_BEHIND = 0x00000002;// Window 不能获得输入焦点，即不接受任何按键或按钮事件，例如该 Window 上 有 EditView，点击 EditView 是 不会弹出软键盘的// Window 范围外的事件依旧为原窗口处理；例如点击该窗口外的view，依然会有响应。另外只要设置了此Flag，都将会启用FLAG_NOT_TOUCH_MODALpublic static final int FLAG_NOT_FOCUSABLE = 0x00000008;// 设置了该 Flag,将 Window 之外的按键事件发送给后面的 Window 处理, 而自己只会处理 Window 区域内的触摸事件// Window 之外的 view 也是可以响应 touch 事件。public static final int FLAG_NOT_TOUCH_MODAL = 0x00000020;// 设置了该Flag，表示该 Window 将不会接受任何 touch 事件，例如点击该 Window 不会有响应，只会传给下面有聚焦的窗口。public static final int FLAG_NOT_TOUCHABLE = 0x00000010;// 只要 Window 可见时屏幕就会一直亮着public static final int FLAG_KEEP_SCREEN_ON = 0x00000080;// 允许 Window 占满整个屏幕public static final int FLAG_LAYOUT_IN_SCREEN = 0x00000100;// 允许 Window 超过屏幕之外public static final int FLAG_LAYOUT_NO_LIMITS = 0x00000200;// 全屏显示，隐藏所有的 Window 装饰，比如在游戏、播放器中的全屏显示public static final int FLAG_FULLSCREEN = 0x00000400;// 表示比FLAG_FULLSCREEN低一级，会显示状态栏public static final int FLAG_FORCE_NOT_FULLSCREEN = 0x00000800;// 当用户的脸贴近屏幕时（比如打电话），不会去响应此事件public static final int FLAG_IGNORE_CHEEK_PRESSES = 0x00008000;// 则当按键动作发生在 Window 之外时，将接收到一个MotionEvent.ACTION_OUTSIDE事件。public static final int FLAG_WATCH_OUTSIDE_TOUCH = 0x00040000;@Deprecated// 窗口可以在锁屏的 Window 之上显示, 使用 Activity#setShowWhenLocked(boolean) 方法代替public static final int FLAG_SHOW_WHEN_LOCKED = 0x00080000;// 表示负责绘制系统栏背景。如果设置，系统栏将以透明背景绘制，// 此 Window 中的相应区域将填充 Window＃getStatusBarColor（）和 Window＃getNavigationBarColor（）中指定的颜色。public static final int FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS = 0x80000000;// 表示要求系统壁纸显示在该 Window 后面，Window 表面必须是半透明的，才能真正看到它背后的壁纸public static final int FLAG_SHOW_WALLPAPER = 0x00100000;window的solfInputMode属性这一部分就是当软件盘弹起来的时候，window的处理逻辑，这在日常中也经常遇到，如：聊天的时候，点击输入框，当软键盘弹起来的时候输入框也会被顶上去。如果你不想被顶上去，也可以设置为被软键盘覆盖。下面介绍一下常见的属性// 没有指定状态，系统会选择一个合适的状态或者依赖于主题的配置public static final int SOFT_INPUT_STATE_UNCHANGED = 1;// 当用户进入该窗口时，隐藏软键盘public static final int SOFT_INPUT_STATE_HIDDEN = 2;// 当窗口获取焦点时，隐藏软键盘public static final int SOFT_INPUT_STATE_ALWAYS_HIDDEN = 3;// 当用户进入窗口时，显示软键盘public static final int SOFT_INPUT_STATE_VISIBLE = 4;// 当窗口获取焦点时，显示软键盘public static final int SOFT_INPUT_STATE_ALWAYS_VISIBLE = 5;// window会调整大小以适应软键盘窗口public static final int SOFT_INPUT_MASK_ADJUST = 0xf0;// 没有指定状态,系统会选择一个合适的状态或依赖于主题的设置public static final int SOFT_INPUT_ADJUST_UNSPECIFIED = 0x00;// 当软键盘弹出时，窗口会调整大小,例如点击一个EditView，整个layout都将平移可见且处于软件盘的上方// 同样的该模式不能与SOFT_INPUT_ADJUST_PAN结合使用；// 如果窗口的布局参数标志包含FLAG_FULLSCREEN，则将忽略这个值，窗口不会调整大小，但会保持全屏。public static final int SOFT_INPUT_ADJUST_RESIZE = 0x10;// 当软键盘弹出时，窗口不需要调整大小, 要确保输入焦点是可见的,// 例如有两个EditView的输入框，一个为Ev1，一个为Ev2，当你点击Ev1想要输入数据时，当前的Ev1的输入框会移到软键盘上方// 该模式不能与SOFT_INPUT_ADJUST_RESIZE结合使用public static final int SOFT_INPUT_ADJUST_PAN = 0x20;// 将不会调整大小，直接覆盖在window上public static final int SOFT_INPUT_ADJUST_NOTHING = 0x30;

WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams();windParams.flags = WindowManager.LayoutParams.FLAG_FULLSCREEN;TextView view = new TextView(this);getWindowManager.addview(view,windowParams);getWindow().flags = WindowManager.LayoutParams.FLAG_FULLSCREEN; <activity android:windowSoftInputMode="SOFT_INPUT_STATE_VISIBLE" />

public class PhoneWindow extends Window implements MenuBuilder.Callback { private final static String TAG = "PhoneWindow"; final PhoneWindowMenuCallback mContextMenuCallback = new PhoneWindowMenuCallback(this); final TypedValue mMinWidthMajor = new TypedValue(); final TypedValue mMinWidthMinor = new TypedValue(); TypedValue mFixedWidthMajor; TypedValue mFixedWidthMinor; TypedValue mFixedHeightMajor; TypedValue mFixedHeightMinor; // This is the top-level view of the window, containing the window decor. private DecorView mDecor; // When we reuse decor views, we need to recreate the content root. This happens when the decor // view is requested, so we need to force the recreating without introducing an infinite loop. private boolean mForceDecorInstall = false; // This is the view in which the window contents are placed. It is either // mDecor itself, or a child of mDecor where the contents go. ViewGroup mContentParent; // Whether the client has explicitly set the content view. If false and mContentParent is not // , then the content parent was set due to window preservation. private boolean mContentParentExplicitlySet = false; Callback2 mTakeSurfaceCallback; InputQueue.Callback mTakeInputQueueCallback; boolean mIsFloating; private boolean mIsTranslucent; private LayoutInflater mLayoutInflater; private TextView mTitleView; DecorContentParent mDecorContentParent;}

/** @hide */public class DecorView extends FrameLayout implements RootViewSurfaceTaker, WindowCallbacks { private static final String TAG = "DecorView"; private static final boolean DEBUG_MEASURE = false; private static final boolean SWEEP_OPEN_MENU = false; // The height of a window which has focus in DIP. private final static int DECOR_SHADOW_FOCUSED_HEIGHT_IN_DIP = 20; // The height of a window which has not in DIP. private final static int DECOR_SHADOW_UNFOCUSED_HEIGHT_IN_DIP = 5; private static final int SCRIM_LIGHT = 0xe6ffffff; // 90% white private Drawable mMenuBackground; private boolean mWatchingForMenu; private int mDownY; ActionMode mPrimaryActionMode; private ActionMode mFloatingActionMode; private ActionBarContextView mPrimaryActionModeView; private PopupWindow mPrimaryActionModePopup; private Runnable mShowPrimaryActionModePopup; private ViewTreeObserver.OnPreDrawListener mFloatingToolbarPreDrawListener; private View mFloatingActionModeOriginatingView; private FloatingToolbar mFloatingToolbar; private ObjectAnimator mFadeAnim; // View added at runtime to draw under the status bar area private View mStatusGuard;}