Android example source code file (BulletSpan.java)

This example Android source code file (BulletSpan.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, bullet_radius, bulletspan, charsequence, drawing, graphics, layout, leadingmarginspan, paint, parcelablespan, spanned, standard_gap_width, text, ui

The BulletSpan.java Android example source code

/*
 * Copyright (C) 2006 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.graphics.Canvas;
import android.graphics.Paint;
import android.os.Parcel;
import android.text.Layout;
import android.text.ParcelableSpan;
import android.text.Spanned;
import android.text.TextUtils;

public class BulletSpan implements LeadingMarginSpan, ParcelableSpan {
    private final int mGapWidth;
    private final boolean mWantColor;
    private final int mColor;

    private static final int BULLET_RADIUS = 3;
    public static final int STANDARD_GAP_WIDTH = 2;

    public BulletSpan() {
        mGapWidth = STANDARD_GAP_WIDTH;
        mWantColor = false;
        mColor = 0;
    }

    public BulletSpan(int gapWidth) {
        mGapWidth = gapWidth;
        mWantColor = false;
        mColor = 0;
    }

    public BulletSpan(int gapWidth, int color) {
        mGapWidth = gapWidth;
        mWantColor = true;
        mColor = color;
    }

    public BulletSpan(Parcel src) {
        mGapWidth = src.readInt();
        mWantColor = src.readInt() != 0;
        mColor = src.readInt();
    }
    
    public int getSpanTypeId() {
        return TextUtils.BULLET_SPAN;
    }
    
    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(mGapWidth);
        dest.writeInt(mWantColor ? 1 : 0);
        dest.writeInt(mColor);
    }

    public int getLeadingMargin(boolean first) {
        return 2 * BULLET_RADIUS + mGapWidth;
    }

    public void drawLeadingMargin(Canvas c, Paint p, int x, int dir,
                                  int top, int baseline, int bottom,
                                  CharSequence text, int start, int end,
                                  boolean first, Layout l) {
        if (((Spanned) text).getSpanStart(this) == start) {
            Paint.Style style = p.getStyle();
            int oldcolor = 0;

            if (mWantColor) {
                oldcolor = p.getColor();
                p.setColor(mColor);
            }

            p.setStyle(Paint.Style.FILL);

            c.drawCircle(x + dir * BULLET_RADIUS, (top + bottom) / 2.0f,
                         BULLET_RADIUS, p);

            if (mWantColor) {
                p.setColor(oldcolor);
            }

            p.setStyle(style);
        }
    }
}