Android example source code file (TextAppearanceSpan.java)

This example Android source code file (TextAppearanceSpan.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, colorstatelist, content, drawing, metricaffectingspan, os, override, paint, parcelablespan, string, text, textappearance_textcolorlink, textappearance_textsize, textappearancespan, typedarray, typeface

The TextAppearanceSpan.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.text.style;

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.os.Parcel;
import android.text.ParcelableSpan;
import android.text.TextPaint;
import android.text.TextUtils;

/**
 * Sets the text color, size, style, and typeface to match a TextAppearance
 * resource.
 */
public class TextAppearanceSpan extends MetricAffectingSpan implements ParcelableSpan {
    private final String mTypeface;
    private final int mStyle;
    private final int mTextSize;
    private final ColorStateList mTextColor;
    private final ColorStateList mTextColorLink;

    /**
     * Uses the specified TextAppearance resource to determine the
     * text appearance.  The <code>appearance should be, for example,
     * <code>android.R.style.TextAppearance_Small.
     */
    public TextAppearanceSpan(Context context, int appearance) {
        this(context, appearance, -1);
    }

    /**
     * Uses the specified TextAppearance resource to determine the
     * text appearance, and the specified text color resource
     * to determine the color.  The <code>appearance should be,
     * for example, <code>android.R.style.TextAppearance_Small,
     * and the <code>colorList should be, for example,
     * <code>android.R.styleable.Theme_textColorDim.
     */
    public TextAppearanceSpan(Context context, int appearance,
                              int colorList) {
        ColorStateList textColor;
        
        TypedArray a =
            context.obtainStyledAttributes(appearance,
                                           com.android.internal.R.styleable.TextAppearance);

        textColor = a.getColorStateList(com.android.internal.R.styleable.
                                        TextAppearance_textColor);
        mTextColorLink = a.getColorStateList(com.android.internal.R.styleable.
                                        TextAppearance_textColorLink);
        mTextSize = a.getDimensionPixelSize(com.android.internal.R.styleable.
                                        TextAppearance_textSize, -1);

        mStyle = a.getInt(com.android.internal.R.styleable.TextAppearance_textStyle, 0);
        int tf = a.getInt(com.android.internal.R.styleable.TextAppearance_typeface, 0);

        switch (tf) {
            case 1:
                mTypeface = "sans";
                break;

            case 2:
                mTypeface = "serif";
                break;

            case 3:
                mTypeface = "monospace";
                break;
                
            default:
                mTypeface = null;
                break;
        }

        a.recycle();

        if (colorList >= 0) {
            a = context.obtainStyledAttributes(com.android.internal.R.style.Theme,
                                            com.android.internal.R.styleable.Theme);

            textColor = a.getColorStateList(colorList);
            a.recycle();
        }
        
        mTextColor = textColor;
    }

    /**
     * Makes text be drawn with the specified typeface, size, style,
     * and colors.
     */
    public TextAppearanceSpan(String family, int style, int size,
                              ColorStateList color, ColorStateList linkColor) {
        mTypeface = family;
        mStyle = style;
        mTextSize = size;
        mTextColor = color;
        mTextColorLink = linkColor;
    }

    public TextAppearanceSpan(Parcel src) {
        mTypeface = src.readString();
        mStyle = src.readInt();
        mTextSize = src.readInt();
        if (src.readInt() != 0) {
            mTextColor = ColorStateList.CREATOR.createFromParcel(src);
        } else {
            mTextColor = null;
        }
        if (src.readInt() != 0) {
            mTextColorLink = ColorStateList.CREATOR.createFromParcel(src);
        } else {
            mTextColorLink = null;
        }
    }
    
    public int getSpanTypeId() {
        return TextUtils.TEXT_APPEARANCE_SPAN;
    }
    
    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(mTypeface);
        dest.writeInt(mStyle);
        dest.writeInt(mTextSize);
        if (mTextColor != null) {
            dest.writeInt(1);
            mTextColor.writeToParcel(dest, flags);
        } else {
            dest.writeInt(0);
        }
        if (mTextColorLink != null) {
            dest.writeInt(1);
            mTextColorLink.writeToParcel(dest, flags);
        } else {
            dest.writeInt(0);
        }
    }

    /**
     * Returns the typeface family specified by this span, or <code>null
     * if it does not specify one.
     */
    public String getFamily() {
        return mTypeface;
    }

    /**
     * Returns the text color specified by this span, or <code>null
     * if it does not specify one.
     */
    public ColorStateList getTextColor() {
        return mTextColor;
    }

    /**
     * Returns the link color specified by this span, or <code>null
     * if it does not specify one.
     */
    public ColorStateList getLinkTextColor() {
        return mTextColorLink;
    }

    /**
     * Returns the text size specified by this span, or <code>-1
     * if it does not specify one.
     */
    public int getTextSize() {
        return mTextSize;
    }

    /**
     * Returns the text style specified by this span, or <code>0
     * if it does not specify one.
     */
    public int getTextStyle() {
        return mStyle;
    }

    @Override
    public void updateDrawState(TextPaint ds) {
        updateMeasureState(ds);

        if (mTextColor != null) {
            ds.setColor(mTextColor.getColorForState(ds.drawableState, 0));
        }

        if (mTextColorLink != null) {
            ds.linkColor = mTextColor.getColorForState(ds.drawableState, 0);
        }
    }

    @Override
    public void updateMeasureState(TextPaint ds) {
        if (mTypeface != null || mStyle != 0) {
            Typeface tf = ds.getTypeface();
            int style = 0;

            if (tf != null) {
                style = tf.getStyle();
            }

            style |= mStyle;

            if (mTypeface != null) {
                tf = Typeface.create(mTypeface, style);
            } else if (tf == null) {
                tf = Typeface.defaultFromStyle(style);
            } else {
                tf = Typeface.create(tf, style);
            }

            int fake = style & ~tf.getStyle();

            if ((fake & Typeface.BOLD) != 0) {
                ds.setFakeBoldText(true);
            }

            if ((fake & Typeface.ITALIC) != 0) {
                ds.setTextSkewX(-0.25f);
            }

            ds.setTypeface(tf);
        }

        if (mTextSize > 0) {
            ds.setTextSize(mTextSize);
        }
    }
}