Android example source code file (ExtractEditText.java)

This example Android source code file (ExtractEditText.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, attributeset, content, extractedittext, input, inputmethodservice, override, ui, util, view

The ExtractEditText.java Android example source code

/*
 * Copyright (C) 2008 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 android.inputmethodservice;

import android.content.Context;
import android.util.AttributeSet;
import android.view.inputmethod.ExtractedText;
import android.widget.EditText;

/***
 * Specialization of {@link EditText} for showing and interacting with the
 * extracted text in a full-screen input method.
 */
public class ExtractEditText extends EditText {
    private InputMethodService mIME;
    private int mSettingExtractedText;
    
    public ExtractEditText(Context context) {
        super(context, null);
    }

    public ExtractEditText(Context context, AttributeSet attrs) {
        super(context, attrs, com.android.internal.R.attr.editTextStyle);
    }

    public ExtractEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
    
    void setIME(InputMethodService ime) {
        mIME = ime;
    }
    
    /**
     * Start making changes that will not be reported to the client.  That
     * is, {@link #onSelectionChanged(int, int)} will not result in sending
     * the new selection to the client
     */
    public void startInternalChanges() {
        mSettingExtractedText += 1;
    }
    
    /**
     * Finish making changes that will not be reported to the client.  That
     * is, {@link #onSelectionChanged(int, int)} will not result in sending
     * the new selection to the client
     */
    public void finishInternalChanges() {
        mSettingExtractedText -= 1;
    }
    
    /**
     * Implement just to keep track of when we are setting text from the
     * client (vs. seeing changes in ourself from the user).
     */
    @Override public void setExtractedText(ExtractedText text) {
        try {
            mSettingExtractedText++;
            super.setExtractedText(text);
        } finally {
            mSettingExtractedText--;
        }
    }
    
    /**
     * Report to the underlying text editor about selection changes.
     */
    @Override protected void onSelectionChanged(int selStart, int selEnd) {
        if (mSettingExtractedText == 0 && mIME != null && selStart >= 0 && selEnd >= 0) {
            mIME.onExtractedSelectionChanged(selStart, selEnd);
        }
    }
    
    /**
     * Redirect clicks to the IME for handling there.  First allows any
     * on click handler to run, though.
     */
    @Override public boolean performClick() {
        if (!super.performClick() && mIME != null) {
            mIME.onExtractedTextClicked();
            return true;
        }
        return false;
    }
    
    @Override public boolean onTextContextMenuItem(int id) {
        if (mIME != null) {
            if (mIME.onExtractTextContextMenuItem(id)) {
                return true;
            }
        }
        return super.onTextContextMenuItem(id);
    }
    
    /**
     * We are always considered to be an input method target.
     */
    public boolean isInputMethodTarget() {
        return true;
    }
    
    /**
     * Return true if the edit text is currently showing a scroll bar.
     */
    public boolean hasVerticalScrollBar() {
        return computeVerticalScrollRange() > computeVerticalScrollExtent();
    }
    
    /**
     * Pretend like the window this view is in always has focus, so its
     * highlight and cursor will be displayed.
     */
    @Override public boolean hasWindowFocus() {
        return this.isEnabled() ? true : false;
    }

    /**
     * Pretend like this view always has focus, so its
     * highlight and cursor will be displayed.
     */
    @Override public boolean isFocused() {
        return this.isEnabled() ? true : false;
    }

    /**
     * Pretend like this view always has focus, so its
     * highlight and cursor will be displayed.
     */
    @Override public boolean hasFocus() {
        return this.isEnabled() ? true : false;
    }
}