Disable Recorrection when APIs are not supported.

Change-Id: I3b8fdc149d350215fd4852a50456824fe3fabe0b

java/src/com/android/inputmethod/compat/InputConnectionCompatUtils.java

@@ -16,6 +16,8 @@
 
 package com.android.inputmethod.compat;
 
+import com.android.inputmethod.latin.EditingUtils.SelectedWord;
+
 import android.util.Log;
 import android.view.inputmethod.InputConnection;
 
@@ -33,6 +35,16 @@ public class InputConnectionCompatUtils {
             .getConstructor(CLASS_CorrectionInfo, INPUT_TYPE_CorrectionInfo);
     private static final Method METHOD_InputConnection_commitCorrection = CompatUtils
             .getMethod(InputConnection.class, "commitCorrection", CLASS_CorrectionInfo);
+    private static final Method METHOD_getSelectedText = CompatUtils
+            .getMethod(InputConnection.class, "getSelectedText", int.class);
+    private static final Method METHOD_setComposingRegion = CompatUtils
+            .getMethod(InputConnection.class, "setComposingRegion", int.class, int.class);
+    public static final boolean RECORRECTION_SUPPORTED;
+
+    static {
+        RECORRECTION_SUPPORTED = METHOD_getSelectedText != null
+                && METHOD_setComposingRegion != null;
+    }
 
     public static void commitCorrection(InputConnection ic, int offset, CharSequence oldText,
             CharSequence newText) {
@@ -55,4 +67,25 @@ public class InputConnectionCompatUtils {
             Log.e(TAG, "Error in commitCorrection: InvocationTargetException");
         }
     }
+
+
+    /**
+     * Returns the selected text between the selStart and selEnd positions.
+     */
+    public static CharSequence getSelectedText(InputConnection ic, int selStart, int selEnd) {
+        // Use reflection, for backward compatibility
+        return (CharSequence) CompatUtils.invoke(
+                ic, null, METHOD_getSelectedText, 0);
+    }
+
+    /**
+     * Tries to set the text into composition mode if there is support for it in the framework.
+     */
+    public static void underlineWord(InputConnection ic, SelectedWord word) {
+        // Use reflection, for backward compatibility
+        // If method not found, there's nothing we can do. It still works but just wont underline
+        // the word.
+        CompatUtils.invoke(
+                ic, null, METHOD_setComposingRegion, word.mStart, word.mEnd);
+    }
 }

java/src/com/android/inputmethod/latin/EditingUtils.java

@@ -16,13 +16,13 @@
 
 package com.android.inputmethod.latin;
 
+import com.android.inputmethod.compat.InputConnectionCompatUtils;
+
 import android.text.TextUtils;
 import android.view.inputmethod.ExtractedText;
 import android.view.inputmethod.ExtractedTextRequest;
 import android.view.inputmethod.InputConnection;
 
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
 import java.util.regex.Pattern;
 
 /**
@@ -34,11 +34,6 @@ public class EditingUtils {
      */
     private static final int LOOKBACK_CHARACTER_NUM = 15;
 
-    // Cache Method pointers
-    private static boolean sMethodsInitialized;
-    private static Method sMethodGetSelectedText;
-    private static Method sMethodSetComposingRegion;
-
     private EditingUtils() {
         // Unintentional empty constructor for singleton.
     }
@@ -241,7 +236,8 @@ public class EditingUtils {
             }
 
             // Extract the selection alone
-            CharSequence touching = getSelectedText(ic, selStart, selEnd);
+            CharSequence touching = InputConnectionCompatUtils.getSelectedText(
+                    ic, selStart, selEnd);
             if (TextUtils.isEmpty(touching)) return null;
             // Is any part of the selection a separator? If so, return null.
             final int length = touching.length();
@@ -255,74 +251,4 @@ public class EditingUtils {
         }
         return null;
     }
-
-    /**
-     * Cache method pointers for performance
-     */
-    private static void initializeMethodsForReflection() {
-        try {
-            // These will either both exist or not, so no need for separate try/catch blocks.
-            // If other methods are added later, use separate try/catch blocks.
-            sMethodGetSelectedText = InputConnection.class.getMethod("getSelectedText", int.class);
-            sMethodSetComposingRegion = InputConnection.class.getMethod("setComposingRegion",
-                    int.class, int.class);
-        } catch (NoSuchMethodException exc) {
-            // Ignore
-        }
-        sMethodsInitialized = true;
-    }
-
-    /**
-     * Returns the selected text between the selStart and selEnd positions.
-     */
-    private static CharSequence getSelectedText(InputConnection ic, int selStart, int selEnd) {
-        // Use reflection, for backward compatibility
-        CharSequence result = null;
-        if (!sMethodsInitialized) {
-            initializeMethodsForReflection();
-        }
-        if (sMethodGetSelectedText != null) {
-            try {
-                result = (CharSequence) sMethodGetSelectedText.invoke(ic, 0);
-                return result;
-            } catch (InvocationTargetException exc) {
-                // Ignore
-            } catch (IllegalArgumentException e) {
-                // Ignore
-            } catch (IllegalAccessException e) {
-                // Ignore
-            }
-        }
-        // Reflection didn't work, try it the poor way, by moving the cursor to the start,
-        // getting the text after the cursor and moving the text back to selected mode.
-        // TODO: Verify that this works properly in conjunction with 
-        // LatinIME#onUpdateSelection
-        ic.setSelection(selStart, selEnd);
-        result = ic.getTextAfterCursor(selEnd - selStart, 0);
-        ic.setSelection(selStart, selEnd);
-        return result;
-    }
-
-    /**
-     * Tries to set the text into composition mode if there is support for it in the framework.
-     */
-    public static void underlineWord(InputConnection ic, SelectedWord word) {
-        // Use reflection, for backward compatibility
-        // If method not found, there's nothing we can do. It still works but just wont underline
-        // the word.
-        if (!sMethodsInitialized) {
-            initializeMethodsForReflection();
-        }
-        if (sMethodSetComposingRegion != null) {
-            try {
-                sMethodSetComposingRegion.invoke(ic, word.mStart, word.mEnd);
-            } catch (InvocationTargetException exc) {
-                // Ignore
-            } catch (IllegalArgumentException e) {
-                // Ignore
-            } catch (IllegalAccessException e) {
-                // Ignore
-            }
-        }
-    }
 }

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -1771,6 +1771,7 @@ public class LatinIME extends InputMethodServiceCompatWrapper implements Keyboar
     }
 
     private void setOldSuggestions() {
+        if (!InputConnectionCompatUtils.RECORRECTION_SUPPORTED) return;
         mVoiceProxy.setShowingVoiceSuggestions(false);
         if (mCandidateView != null && mCandidateView.isShowingAddToDictionaryHint()) {
             return;
@@ -1790,7 +1791,7 @@ public class LatinIME extends InputMethodServiceCompatWrapper implements Keyboar
                     abortRecorrection(true);
                 } else {
                     TextEntryState.selectedForRecorrection();
-                    EditingUtils.underlineWord(ic, touching);
+                    InputConnectionCompatUtils.underlineWord(ic, touching);
                 }
 
                 ic.endBatchEdit();