Fix a bug with bad application completions

Bug: 8561056
Change-Id: I91fb0ac76dabfc841bafc0e2c0ea9f63e6f604f9

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

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin;
+
+import android.text.TextUtils;
+import android.view.inputmethod.CompletionInfo;
+
+import java.util.Arrays;
+
+/**
+ * Utilities to do various stuff with CompletionInfo.
+ */
+public class CompletionInfoUtils {
+    private CompletionInfoUtils() {
+        // This utility class is not publicly instantiable.
+    }
+
+    public static CompletionInfo[] removeNulls(final CompletionInfo[] src) {
+        int j = 0;
+        final CompletionInfo[] dst = new CompletionInfo[src.length];
+        for (int i = 0; i < src.length; ++i) {
+            if (null != src[i] && !TextUtils.isEmpty(src[i].getText())) {
+                dst[j] = src[i];
+                ++j;
+            }
+        }
+        return Arrays.copyOfRange(dst, 0, j);
+    }
+}

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

@@ -983,7 +983,8 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
             }
         }
         if (!mSettings.getCurrent().isApplicationSpecifiedCompletionsOn()) return;
-        mApplicationSpecifiedCompletions = applicationSpecifiedCompletions;
+        mApplicationSpecifiedCompletions =
+                CompletionInfoUtils.removeNulls(applicationSpecifiedCompletions);
         if (applicationSpecifiedCompletions == null) {
             clearSuggestionStrip();
             if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {

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

@@ -392,7 +392,9 @@ public final class RichInputConnection {
     public void commitCompletion(final CompletionInfo completionInfo) {
         if (DEBUG_BATCH_NESTING) checkBatchEdit();
         if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
-        final CharSequence text = completionInfo.getText();
+        CharSequence text = completionInfo.getText();
+        // text should never be null, but just in case, it's better to insert nothing than to crash
+        if (null == text) text = "";
         mCommittedTextBeforeComposingText.append(text);
         mCurrentCursorPosition += text.length() - mComposingText.length();
         mComposingText.setLength(0);