监听Android系统软键盘的弹出与关闭(案例代码)

/** * Copyright (c) 2015-present, Facebook, Inc. * All rights reserved. * <p> * This source code is licensed under the BSD-style license found in the * LICENSE file in the root directory of this source tree. An additional grant * of patent rights can be found in the PATENTS file in the same directory. */ package xiaxl.custom.keyboard.listener; import android.content.Context; import android.os.Build; import android.util.DisplayMetrics; import android.view.Display; import android.view.WindowManager; import org.jetbrains.annotations.Nullable; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; /** * Holds an instance of the current DisplayMetrics so we don't have to thread it through all the * classes that need it. * Note: windowDisplayMetrics are deprecated in favor of ScreenDisplayMetrics: window metrics * are supposed to return the drawable area but there's no guarantee that they correspond to the * actual size of the {@link android.app.Activity}'s RootView. Moreover, they are not consistent with what iOS * returns. Screen metrics returns the metrics of the entire screen, is consistent with iOS and * should be used instead. */ public class CustomDisplayMetricsHolder { private static @Nullable DisplayMetrics sWindowDisplayMetrics; private static @Nullable DisplayMetrics sScreenDisplayMetrics; /** * @deprecated Use {@link #setScreenDisplayMetrics(DisplayMetrics)} instead. See comment above as * to why this is not correct to use. */ public static void setWindowDisplayMetrics(DisplayMetrics displayMetrics) { sWindowDisplayMetrics = displayMetrics; } public static void initDisplayMetricsIfNotInitialized(Context context) { if (CustomDisplayMetricsHolder.getScreenDisplayMetrics() != null) { return; } initDisplayMetrics(context); } public static void initDisplayMetrics(Context context) { DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics(); CustomDisplayMetricsHolder.setWindowDisplayMetrics(displayMetrics); DisplayMetrics screenDisplayMetrics = new DisplayMetrics(); screenDisplayMetrics.setTo(displayMetrics); WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); if (wm == null) throw new AssertionError(); Display display = wm.getDefaultDisplay(); // Get the real display metrics if we are using API level 17 or higher. // The real metrics include system decor elements (e.g. soft menu bar). // // See: http://developer.android.com/reference/android/view/Display.html#getRealMetrics(android.util.DisplayMetrics) if (Build.VERSION.SDK_INT >= 17) { display.getRealMetrics(screenDisplayMetrics); } else { // For 14 <= API level <= 16, we need to invoke getRawHeight and getRawWidth to get the real dimensions. // Since react-native only supports API level 16+ we don't have to worry about other cases. // // Reflection exceptions are rethrown at runtime. // // See: http://stackoverflow.com/questions/14341041/how-to-get-real-screen-height-and-width/23861333#23861333 try { Method mGetRawH = Display.class.getMethod("getRawHeight"); Method mGetRawW = Display.class.getMethod("getRawWidth"); screenDisplayMetrics.widthPixels = (Integer) mGetRawW.invoke(display); screenDisplayMetrics.heightPixels = (Integer) mGetRawH.invoke(display); } catch (InvocationTargetException e) { throw new RuntimeException("Error getting real dimensions for API level < 17", e); } catch (IllegalAccessException e) { throw new RuntimeException("Error getting real dimensions for API level < 17", e); } catch (NoSuchMethodException e) { throw new RuntimeException("Error getting real dimensions for API level < 17", e); } } CustomDisplayMetricsHolder.setScreenDisplayMetrics(screenDisplayMetrics); } /** * @deprecated Use {@link #getScreenDisplayMetrics()} instead. See comment above as to why this * is not correct to use. */ @Deprecated public static DisplayMetrics getWindowDisplayMetrics() { return sWindowDisplayMetrics; } public static void setScreenDisplayMetrics(DisplayMetrics screenDisplayMetrics) { sScreenDisplayMetrics = screenDisplayMetrics; } public static DisplayMetrics getScreenDisplayMetrics() { return sScreenDisplayMetrics; } }