Android监听键盘状态获取键盘高度的实现方法

view.getViewTreeObserver().addOnGlobalLayoutListener(listener);

package com.cari.cari.promo.diskon.util;


import android.content.Context;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewTreeObserver;

import java.util.LinkedList;
import java.util.List;

public class SoftKeyboardStateWatcher implements ViewTreeObserver.OnGlobalLayoutListener {

 public interface SoftKeyboardStateListener {
  void onSoftKeyboardOpened(int keyboardHeightInPx);

  void onSoftKeyboardClosed();
 }

 private final List<SoftKeyboardStateListener> listeners = new LinkedList<>();
 private final View activityRootView;
 private int lastSoftKeyboardHeightInPx;
 private boolean isSoftKeyboardOpened;
 private Context mContext;

 //使用时用这个构造方法
 public SoftKeyboardStateWatcher(View activityRootView, Context context) {

  this(activityRootView, false);
  this.mContext = context;
 }

 private SoftKeyboardStateWatcher(View activityRootView) {
  this(activityRootView, false);
 }

 private SoftKeyboardStateWatcher(View activityRootView, boolean isSoftKeyboardOpened) {
  this.activityRootView = activityRootView;
  this.isSoftKeyboardOpened = isSoftKeyboardOpened;
  activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(this);
 }

 @Override
 public void onGlobalLayout() {
  final Rect r = new Rect();
  activityRootView.getWindowVisibleDisplayFrame(r);

  final int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
  if (!isSoftKeyboardOpened && heightDiff > dpToPx(mContext, 200)) {
   isSoftKeyboardOpened = true;
   notifyOnSoftKeyboardOpened(heightDiff);
  } else if (isSoftKeyboardOpened && heightDiff < dpToPx(mContext, 200)) {
   isSoftKeyboardOpened = false;
   notifyOnSoftKeyboardClosed();
  }
 }

 public void setIsSoftKeyboardOpened(boolean isSoftKeyboardOpened) {
  this.isSoftKeyboardOpened = isSoftKeyboardOpened;
 }

 public boolean isSoftKeyboardOpened() {
  return isSoftKeyboardOpened;
 }

 /**
  * Default value is zero {@code 0}.
  *
  * @return last saved keyboard height in px
  */
 public int getLastSoftKeyboardHeightInPx() {
  return lastSoftKeyboardHeightInPx;
 }

 public void addSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
  listeners.add(listener);
 }

 public void removeSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
  listeners.remove(listener);
 }

 /**
  * @param keyboardHeightInPx 可能是包含状态栏的高度和底部虚拟按键的高度
  */
 private void notifyOnSoftKeyboardOpened(int keyboardHeightInPx) {
  this.lastSoftKeyboardHeightInPx = keyboardHeightInPx;

  for (SoftKeyboardStateListener listener : listeners) {
   if (listener != null) {
    listener.onSoftKeyboardOpened(keyboardHeightInPx);
   }
  }
 }

 private void notifyOnSoftKeyboardClosed() {
  for (SoftKeyboardStateListener listener : listeners) {
   if (listener != null) {
    listener.onSoftKeyboardClosed();
   }
  }
 }

 private static float dpToPx(Context context, float valueInDp) {
  DisplayMetrics metrics = context.getResources().getDisplayMetrics();
  return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueInDp, metrics);
 }
}

ScrollView scrollView = findViewById(R.id.ugc_scrollview);
  final SoftKeyboardStateWatcher watcher = new SoftKeyboardStateWatcher(scrollView, this);
  watcher.addSoftKeyboardStateListener(
    new SoftKeyboardStateWatcher.SoftKeyboardStateListener() {

     @Override
     public void onSoftKeyboardOpened(int keyboardHeightInPx) {
      ConstraintLayout.LayoutParams layoutParamsVideo = (ConstraintLayout.LayoutParams) mError1000tv.getLayoutParams();

      layoutParamsVideo.setMargins(0,
        0,
        0,
        keyboardHeightInPx
          - ScreenUtils.getStatusHeight(UGCEditActivity.this)
          - ScreenUtils.getBottomStatusHeight(UGCEditActivity.this));
     }

     @Override
     public void onSoftKeyboardClosed() {
      mError1000tv.setVisibility(View.GONE);
     }
    }
  );

package com.cari.promo.diskon.util;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;

import java.lang.reflect.Method;

public class ScreenUtils {
 private ScreenUtils() {
  /* cannot be instantiated */
  throw new UnsupportedOperationException("cannot be instantiated");
 }

 /**
  * 获得屏幕高度
  *
  * @param context
  * @return
  */
 public static int getScreenWidth(Context context) {
  WindowManager wm = (WindowManager) context
    .getSystemService(Context.WINDOW_SERVICE);
  DisplayMetrics outMetrics = new DisplayMetrics();
  wm.getDefaultDisplay().getMetrics(outMetrics);
  return outMetrics.widthPixels;
 }

 /**
  * 获得屏幕宽度
  *
  * @param context
  * @return
  */
 public static int getScreenHeight(Context context) {
  WindowManager wm = (WindowManager) context
    .getSystemService(Context.WINDOW_SERVICE);
  DisplayMetrics outMetrics = new DisplayMetrics();
  wm.getDefaultDisplay().getMetrics(outMetrics);
  return outMetrics.heightPixels;
 }

 /**
  * 获得状态栏的高度
  *
  * @param context
  * @return
  */
 public static int getStatusHeight(Context context) {

  int statusHeight = -1;
  try {
   Class<?> clazz = Class.forName("com.android.internal.R$dimen");
   Object object = clazz.newInstance();
   int height = Integer.parseInt(clazz.getField("status_bar_height")
     .get(object).toString());
   statusHeight = context.getResources().getDimensionPixelSize(height);
  } catch (Exception e) {
   e.printStackTrace();
  }
  return statusHeight;
 }

 /**
  * 获取当前屏幕截图，包含状态栏
  *
  * @param activity
  * @return
  */
 public static Bitmap snapShotWithStatusBar(Activity activity) {
  View view = activity.getWindow().getDecorView();
  view.setDrawingCacheEnabled(true);
  view.buildDrawingCache();
  Bitmap bmp = view.getDrawingCache();
  int width = getScreenWidth(activity);
  int height = getScreenHeight(activity);
  Bitmap bp = null;
  bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
  view.destroyDrawingCache();
  return bp;

 }

 /**
  * 获取当前屏幕截图，不包含状态栏
  *
  * @param activity
  * @return
  */
 public static Bitmap snapShotWithoutStatusBar(Activity activity) {
  View view = activity.getWindow().getDecorView();
  view.setDrawingCacheEnabled(true);
  view.buildDrawingCache();
  Bitmap bmp = view.getDrawingCache();
  Rect frame = new Rect();
  activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
  int statusBarHeight = frame.top;

  int width = getScreenWidth(activity);
  int height = getScreenHeight(activity);
  Bitmap bp = null;
  bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
    - statusBarHeight);
  view.destroyDrawingCache();
  return bp;
 }

 /**
  * 获取 虚拟按键的高度
  *
  * @param context 上下文
  * @return 虚拟键高度
  */
 public static int getBottomStatusHeight(Context context) {
  int totalHeight = getAbsoluteHeight(context);

  int contentHeight = getScreenHeight(context);

  return totalHeight - contentHeight;
 }

 /**
  * 获取屏幕原始尺寸高度，包括虚拟功能键高度
  *
  * @param context 上下文
  * @return The absolute height of the available display size in pixels.
  */
 private static int getAbsoluteHeight(Context context) {
  int absoluteHeight = 0;
  WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
  Display display = null;
  if (windowManager != null) {
   display = windowManager.getDefaultDisplay();
  }
  DisplayMetrics displayMetrics = new DisplayMetrics();
  @SuppressWarnings("rawtypes")
  Class c;
  try {
   c = Class.forName("android.view.Display");
   @SuppressWarnings("unchecked")
   Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
   method.invoke(display, displayMetrics);
   absoluteHeight = displayMetrics.heightPixels;
  } catch (Exception e) {
   e.printStackTrace();
  }
  return absoluteHeight;
 }
}