Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2009 Google Inc.
 * 
 * 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.
 */

import android.view.inputmethod.InputConnection;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {
    private static boolean sMethodsInitialized;
    private static Method sMethodGetSelectedText;
    private static Method sMethodSetComposingRegion;

    /**
     * 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;
    }

    /**
     * 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;
    }
}