Android example source code file (DialogTitle.java)

This example Android source code file (DialogTitle.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, dialogtitle, layout, override, textview, typedarray, ui, util, utilities, utils

The DialogTitle.java Android example source code

/* 
 * Copyright (C) 2008 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.
 */

package com.android.internal.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.text.Layout;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;

/**
 * Used by dialogs to change the font size and number of lines to try to fit
 * the text to the available space.
 */
public class DialogTitle extends TextView {
    
    public DialogTitle(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }

    public DialogTitle(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public DialogTitle(Context context) {
        super(context);
    }
    
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        final Layout layout = getLayout();
        if (layout != null) {
            final int lineCount = layout.getLineCount();
            if (lineCount > 0) {
                final int ellipsisCount = layout.getEllipsisCount(lineCount - 1);
                if (ellipsisCount > 0) {
                    setSingleLine(false);
                    
                    TypedArray a = mContext.obtainStyledAttributes(
                            android.R.style.TextAppearance_Medium,
                            android.R.styleable.TextAppearance);
                    final int textSize = a.getDimensionPixelSize(
                            android.R.styleable.TextAppearance_textSize,
                            (int) (20 * getResources().getDisplayMetrics().density));

                    // textSize is already expressed in pixels
                    setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
                    setMaxLines(2);
                    super.onMeasure(widthMeasureSpec, heightMeasureSpec);      
                }
            }
        }
    }
}