Android example source code file (SpannedTest.java)

This example Android source code file (SpannedTest.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, drawing, exception, graphics, hello, object, os, parcel, smalltest, spannablestring, spannablestringbuilder, spanned, spannedtest, spanwatcher, test, testcase, text, textappearancespan, typefacespan, watcher

The SpannedTest.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;

import android.graphics.Typeface;
import android.os.Parcel;
import android.test.suitebuilder.annotation.SmallTest;
import android.text.*;
import android.text.style.*;
import android.util.Log;

import junit.framework.TestCase;

/**
 * SpannedTest tests some features of Spanned
 */
public class SpannedTest extends TestCase {
    private int mExpect;

    @SmallTest
    public void testSpannableString() throws Exception {
        checkPriority(new SpannableString("the quick brown fox"));
    }

    @SmallTest
    public void testSpannableStringBuilder() throws Exception {
        checkPriority2(new SpannableStringBuilder("the quick brown fox"));
    }

    @SmallTest
    public void testAppend() throws Exception {
        Object o = new Object();
        SpannableString ss = new SpannableString("Test");
        ss.setSpan(o, 0, ss.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        SpannableStringBuilder ssb = new SpannableStringBuilder();
        ssb.append(ss);
        assertEquals(0, ssb.getSpanStart(o));
        assertEquals(4, ssb.getSpanEnd(o));
        assertEquals(1, ssb.getSpans(0, 4, Object.class).length);

        ssb.insert(0, ss);
        assertEquals(4, ssb.getSpanStart(o));
        assertEquals(8, ssb.getSpanEnd(o));
        assertEquals(0, ssb.getSpans(0, 4, Object.class).length);
        assertEquals(1, ssb.getSpans(4, 8, Object.class).length);
    }

    @SmallTest
    public void testWrapParcel() {
        SpannableString s = new SpannableString("Hello there world");
        CharacterStyle mark = new StyleSpan(Typeface.BOLD);
        s.setSpan(mark, 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        s.setSpan(CharacterStyle.wrap(mark), 3, 7,
                  Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        s.setSpan(new TextAppearanceSpan("mono", 0, -1, null, null), 7, 8,
                  Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        s.setSpan(CharacterStyle.wrap(new TypefaceSpan("mono")), 8, 9,
                  Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        Parcel p = Parcel.obtain();
        TextUtils.writeToParcel(s, p, 0);
        p.setDataPosition(0);

        Spanned s2 = (Spanned) TextUtils.CHAR_SEQUENCE_CREATOR.
                        createFromParcel(p);
        StyleSpan[] style;

        style = s2.getSpans(1, 2, StyleSpan.class);
        assertEquals(1, style.length);
        assertEquals(1, s2.getSpanStart(style[0]));
        assertEquals(2, s2.getSpanEnd(style[0]));

        style = s2.getSpans(3, 7, StyleSpan.class);
        assertEquals(1, style.length);
        assertEquals(3, s2.getSpanStart(style[0]));
        assertEquals(7, s2.getSpanEnd(style[0]));

        TextAppearanceSpan[] appearance = s2.getSpans(7, 8,
                                                TextAppearanceSpan.class);
        assertEquals(1, appearance.length);
        assertEquals(7, s2.getSpanStart(appearance[0]));
        assertEquals(8, s2.getSpanEnd(appearance[0]));

        TypefaceSpan[] tf = s2.getSpans(8, 9, TypefaceSpan.class);
        assertEquals(1, tf.length);
        assertEquals(8, s2.getSpanStart(tf[0]));
        assertEquals(9, s2.getSpanEnd(tf[0]));
    }

    private void checkPriority(Spannable s) {
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE |
                                      (5 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE |
                                      (10 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE |
                                      (0 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE |
                                      (15 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE |
                                      (3 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE |
                                      (6 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE |
                                      (0 << Spannable.SPAN_PRIORITY_SHIFT));

        Object[] spans = s.getSpans(0, s.length(), Object.class);

        for (int i = 0; i < spans.length - 1; i++) {
            assertEquals((s.getSpanFlags(spans[i]) & Spanned.SPAN_PRIORITY) >=
                         (s.getSpanFlags(spans[i + 1]) & Spanned.SPAN_PRIORITY),
                         true);
        }

        mExpect = 0;

        s.setSpan(new Watcher(2), 0, s.length(), 
                  Spannable.SPAN_INCLUSIVE_INCLUSIVE |
                  (2 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Watcher(4), 0, s.length(), 
                  Spannable.SPAN_INCLUSIVE_INCLUSIVE |
                  (4 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Watcher(1), 0, s.length(), 
                  Spannable.SPAN_INCLUSIVE_INCLUSIVE |
                  (1 << Spannable.SPAN_PRIORITY_SHIFT));
        s.setSpan(new Watcher(3), 0, s.length(), 
                  Spannable.SPAN_INCLUSIVE_INCLUSIVE |
                  (3 << Spannable.SPAN_PRIORITY_SHIFT));

        mExpect = 4;
        s.setSpan(new Object(), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        assertEquals(mExpect, 0);
    }

    private void checkPriority2(SpannableStringBuilder ssb) {
        checkPriority(ssb);

        mExpect = 4;
        ssb.insert(3, "something");
        assertEquals(mExpect, 0);
    }

    private class Watcher implements SpanWatcher, TextWatcher {
        private int mSequence;

        public Watcher(int sequence) {
            mSequence = sequence;
        }

        public void onSpanChanged(Spannable b, Object o, int s, int e,
                                  int st, int en) { }
        public void onSpanRemoved(Spannable b, Object o, int s, int e) { }

        public void onSpanAdded(Spannable b, Object o, int s, int e) {
            if (mExpect != 0) {
                assertEquals(mSequence, mExpect);
                mExpect = mSequence - 1;
            }
        }

        public void beforeTextChanged(CharSequence s, int start, int count,
                                      int after) { }
        public void onTextChanged(CharSequence s, int start, int before,
                                      int count) {
            if (mExpect != 0) {
                assertEquals(mSequence, mExpect);
                mExpect = mSequence - 1;
            }
        }

        public void afterTextChanged(Editable s) { }
    }
}