Merge "Create display context when switching IME to new display"

am: 849ba2a546

Change-Id: I5e9d6fd9fd877f51fea52ab759729278398caf54

samples/SoftKeyboard/Android.bp

@@ -1,8 +1,10 @@
 android_app {
     name: "SoftKeyboard",
     srcs: ["**/*.java"],
+    min_sdk_version: "19",
+    target_sdk_version: "29",
     sdk_version: "current",
-    dex_preopt: {
-        enabled: false,
-    },
+    static_libs: [
+        "androidx.annotation_annotation",
+    ],
 }

samples/SoftKeyboard/src/com/example/android/softkeyboard/SoftKeyboard.java

@@ -17,22 +17,28 @@
 package com.example.android.softkeyboard;
 
 import android.app.Dialog;
+import android.content.Context;
 import android.inputmethodservice.InputMethodService;
 import android.inputmethodservice.Keyboard;
 import android.inputmethodservice.KeyboardView;
+import android.os.Build;
 import android.os.IBinder;
 import android.text.InputType;
 import android.text.method.MetaKeyKeyListener;
+import android.view.Display;
 import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.View;
 import android.view.Window;
+import android.view.WindowManager;
 import android.view.inputmethod.CompletionInfo;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputConnection;
 import android.view.inputmethod.InputMethodManager;
 import android.view.inputmethod.InputMethodSubtype;
 
+import androidx.annotation.NonNull;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -43,7 +49,7 @@ import java.util.List;
  * a basic example for how you would get started writing an input method, to
  * be fleshed out as appropriate.
  */
-public class SoftKeyboard extends InputMethodService 
+public class SoftKeyboard extends InputMethodService
         implements KeyboardView.OnKeyboardActionListener {
     static final boolean DEBUG = false;
     
@@ -88,12 +94,35 @@ public class SoftKeyboard extends InputMethodService
         mInputMethodManager = (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);
         mWordSeparators = getResources().getString(R.string.word_separators);
     }
+
+    /**
+     * Create new context object whose resources are adjusted to match the metrics of the display
+     * which is managed by WindowManager.
+     *
+     * @see {@link Context#createDisplayContext(Display)}
+     */
+    @NonNull Context getDisplayContext() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
+            // createDisplayContext is not available.
+            return this;
+        }
+        // TODO (b/133825283): Non-activity components Resources / DisplayMetrics update when
+        //  moving to external display.
+        // An issue in Q that non-activity components Resources / DisplayMetrics in
+        // Context doesn't well updated when the IME window moving to external display.
+        // Currently we do a workaround is to create new display context directly and re-init
+        // keyboard layout with this context.
+        final WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
+        return createDisplayContext(wm.getDefaultDisplay());
+    }
     
     /**
      * This is the point where you can do all of your UI initialization.  It
      * is called after creation and any configuration change.
      */
     @Override public void onInitializeInterface() {
+        final Context displayContext = getDisplayContext();
+
         if (mQwertyKeyboard != null) {
             // Configuration changes can happen after the keyboard gets recreated,
             // so we need to be able to re-build the keyboards if the available
@@ -102,9 +131,9 @@ public class SoftKeyboard extends InputMethodService
             if (displayWidth == mLastDisplayWidth) return;
             mLastDisplayWidth = displayWidth;
         }
-        mQwertyKeyboard = new LatinKeyboard(this, R.xml.qwerty);
-        mSymbolsKeyboard = new LatinKeyboard(this, R.xml.symbols);
-        mSymbolsShiftedKeyboard = new LatinKeyboard(this, R.xml.symbols_shift);
+        mQwertyKeyboard = new LatinKeyboard(displayContext, R.xml.qwerty);
+        mSymbolsKeyboard = new LatinKeyboard(displayContext, R.xml.symbols);
+        mSymbolsShiftedKeyboard = new LatinKeyboard(displayContext, R.xml.symbols_shift);
     }
     
     /**
@@ -133,7 +162,7 @@ public class SoftKeyboard extends InputMethodService
      * be generated, like {@link #onCreateInputView}.
      */
     @Override public View onCreateCandidatesView() {
-        mCandidateView = new CandidateView(this);
+        mCandidateView = new CandidateView(getDisplayContext());
         mCandidateView.setService(this);
         return mCandidateView;
     }