看了N多文章，終於找到了答案

第一步

注意：必須設定
android:windowSoftInputMode="adjustResize"

原理

注意下面的activityRootView對應的R.id.activityRoot，是你整個佈局的根佈局
原理就是通過判斷手機螢幕的高度與你的根佈局的高度的差值，作為判斷軟鍵盤，彈起、消失的依據
因為當 android:windowSoftInputMode=”adjustResize”`時，軟鍵盤彈出時，會壓縮你的根佈局的顯示高度。根據這個高度的前後變化，來反映軟鍵盤的彈出和隱藏

但是，通過列印log可以發現當你的activity的主題使用了FullScreen之後你的根佈局的高度，在軟鍵盤彈出、隱藏時，就不變了，所以無法通過上述方法，判斷監聽軟鍵盤事件，至於怎麼解決的，看第二篇文章即可

如果你的activity不是採用FullScreen，使用第一種方法就可以

程式碼

1. 直接在Activity裡新增即可

   final View activityRootView = findViewById(R.id.activityRoot);
   activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
       @Override
       public void onGlobalLayout() {
           int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight();
           if
    
    (heightDiff > dpToPx(this, 200)) { 
               // 顯示軟鍵盤
           }else{
               //隱藏軟鍵盤
               }
        }
   });

2. 上面用到的dp轉px方法

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

第二步

注意：必須設定
android:windowSoftInputMode="adjustResize"

很顯然，通過寫了一個類AndroidBug5497Workaround，使得上文說到的“你的根佈局的高度”，在軟鍵盤彈出、隱藏時候，發生了改變，從而監聽了軟鍵盤彈出、隱藏的事件
至於為什麼加入這個類，會得到這個效果，我暫時還沒有研究

1. 寫一個類

   public class AndroidBug5497Workaround {
   
       // For more information, see https://code.google.com/p/android/issues/detail?id=5497
       // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.
   
       public static void assistActivity (Activity activity) {
           new AndroidBug5497Workaround(activity);
       }
   
       private View mChildOfContent;
       private int usableHeightPrevious;
       private FrameLayout.LayoutParams frameLayoutParams;
   
       private AndroidBug5497Workaround(Activity activity) {
           FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
           mChildOfContent = content.getChildAt(0);
           mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
               public void onGlobalLayout() {
                   possiblyResizeChildOfContent();
               }
           });
           frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
       }
   
       private void possiblyResizeChildOfContent() {
           int usableHeightNow = computeUsableHeight();
           if (usableHeightNow != usableHeightPrevious) {
               int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
               int heightDifference = usableHeightSansKeyboard - usableHeightNow;
               if (heightDifference > (usableHeightSansKeyboard/4)) {
                   // keyboard probably just became visible
                   frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
               } else {
                   // keyboard probably just became hidden
                   frameLayoutParams.height = usableHeightSansKeyboard;
               }
               mChildOfContent.requestLayout();
               usableHeightPrevious = usableHeightNow;
           }
       }
   
       private int computeUsableHeight() {
           Rect r = new Rect();
           mChildOfContent.getWindowVisibleDisplayFrame(r);
           return (r.bottom - r.top);
       }
   
   }

2. 在你的Activity裡只需呼叫下面一句話即可

   AndroidBug5497Workaround.assistActivity(this);

下面貼出所有程式碼

1. manifest.xml

   
   ......
   <activity
              android:theme="@style/AppTheme"
              android:name=".Main3Activity"
              ★android:windowSoftInputMode="adjustResize">
              <intent-filter>
                  <action android:name="android.intent.action.MAIN" />
   
                  <category android:name="android.intent.category.LAUNCHER" />
              </intent-filter>
          </activity>
        ......

2. MainActivity（忽略我列印的那些log）

   public class Main3Activity extends AppCompatActivity {
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main3);
           AndroidBug5497Workaround.assistActivity(this);
           final LinearLayout activityRootView = (LinearLayout) findViewById(R.id.activity_main3);
           activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
               @Override
               public void onGlobalLayout() {
                   int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight();
                   if (heightDiff > dpToPx(Main3Activity.this, 150)) { // if more than 200 dp, it's probably a keyboard...
                       // ... do something here
                       Log.e("hhh","show------------");
                       Log.e("hhh","-----activityRootView.getRootView().getHeight()"+activityRootView.getRootView().getHeight());
                       Log.e("hhh","-----activityRootView.getHeight()"+activityRootView.getHeight());
   
                       Log.e("hhh","heightDiff------------"+heightDiff);
                       findViewById(R.id.ivv).setVisibility(View.GONE);
                   }else {
                       Log.e("hhh","hidden=============");
                       Log.e("hhh","=====activityRootView.getRootView().getHeight()"+activityRootView.getRootView().getHeight());
                       Log.e("hhh","=====activityRootView.getHeight()"+activityRootView.getHeight());
                       Log.e("hhh","heightDiff====="+heightDiff);
   
                       findViewById(R.id.ivv).setVisibility(View.VISIBLE);
                   }
               }
           });
       }
       public static float dpToPx(Context context, float valueInDp) {
           DisplayMetrics metrics = context.getResources().getDisplayMetrics();
           return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueInDp, metrics);
       }
   }
   

3. 神奇類 AndroidBug5497Workaround

       package com.demo.ruanjianpandemo;
   
       import android.app.Activity;
       import android.graphics.Rect;
       import android.view.View;
       import android.view.ViewTreeObserver;
       import android.widget.FrameLayout;
   
       public class AndroidBug5497Workaround {
   
           // For more information, see https://code.google.com/p/android/issues/detail?id=5497
           // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.
   
           public static void assistActivity (Activity activity) {
               new AndroidBug5497Workaround(activity);
           }
   
           private View mChildOfContent;
           private int usableHeightPrevious;
           private FrameLayout.LayoutParams frameLayoutParams;
   
           private AndroidBug5497Workaround(Activity activity) {
               FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
               mChildOfContent = content.getChildAt(0);
               mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                   public void onGlobalLayout() {
                       possiblyResizeChildOfContent();
                   }
               });
               frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
           }
   
           private void possiblyResizeChildOfContent() {
               int usableHeightNow = computeUsableHeight();
               if (usableHeightNow != usableHeightPrevious) {
                   int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
                   int heightDifference = usableHeightSansKeyboard - usableHeightNow;
                   if (heightDifference > (usableHeightSansKeyboard/4)) {
                       // keyboard probably just became visible
                       frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
                   } else {
                       // keyboard probably just became hidden
                       frameLayoutParams.height = usableHeightSansKeyboard;
                   }
                   mChildOfContent.requestLayout();
                   usableHeightPrevious = usableHeightNow;
               }
           }
   
           private int computeUsableHeight() {
               Rect r = new Rect();
               mChildOfContent.getWindowVisibleDisplayFrame(r);
               return (r.bottom - r.top);
           }
   
       }
   

4. 佈局

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:id="@+id/activity_main3"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:paddingBottom="@dimen/activity_vertical_margin"
       android:paddingLeft="@dimen/activity_horizontal_margin"
       android:paddingRight="@dimen/activity_horizontal_margin"
       android:paddingTop="@dimen/activity_vertical_margin"
       android:orientation="vertical"
   
       tools:context="com.demo.ruanjianpandemo.Main3Activity">
   <ImageView
       android:id="@+id/ivv"
       android:src="@mipmap/ic_launcher"
       android:layout_width="match_parent"
       android:layout_height="300dp" />
       <com.demo.ruanjianpandemo.MyEditText
           android:id="@+id/myedittext"
           android:layout_width="match_parent"
           android:layout_height="wrap_content" />
       <com.demo.ruanjianpandemo.MyEditText
           android:id="@+id/myedittext1"
           android:layout_width="match_parent"
           android:layout_height="wrap_content" />
   </LinearLayout>