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Diffstat (limited to 'src/com/android/launcher3/compat/AlphabeticIndexCompat.java')
| -rw-r--r-- | src/com/android/launcher3/compat/AlphabeticIndexCompat.java | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/com/android/launcher3/compat/AlphabeticIndexCompat.java b/src/com/android/launcher3/compat/AlphabeticIndexCompat.java new file mode 100644 index 000000000..ec1fb669f --- /dev/null +++ b/src/com/android/launcher3/compat/AlphabeticIndexCompat.java @@ -0,0 +1,170 @@ +package com.android.launcher3.compat; + +import android.content.Context; +import com.android.launcher3.Utilities; + +import java.lang.reflect.Constructor; +import java.lang.reflect.Method; +import java.util.Locale; + +/** + * Fallback class to support Alphabetic indexing if not supported by the framework. + * TODO(winsonc): disable for non-english locales + */ +class BaseAlphabeticIndex { + + private static final String BUCKETS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-"; + private static final int UNKNOWN_BUCKET_INDEX = BUCKETS.length() - 1; + + public BaseAlphabeticIndex() {} + + /** + * Sets the max number of the label buckets in this index. + */ + public void setMaxLabelCount(int count) { + // Not currently supported + } + + /** + * Returns the index of the bucket in which the given string should appear. + */ + protected int getBucketIndex(String s) { + if (s.isEmpty()) { + return UNKNOWN_BUCKET_INDEX; + } + int index = BUCKETS.indexOf(s.substring(0, 1).toUpperCase()); + if (index != -1) { + return index; + } + return UNKNOWN_BUCKET_INDEX; + } + + /** + * Returns the label for the bucket at the given index (as returned by getBucketIndex). + */ + protected String getBucketLabel(int index) { + return BUCKETS.substring(index, index + 1); + } +} + +/** + * Reflected libcore.icu.AlphabeticIndex implementation, falls back to the base alphabetic index. + */ +public class AlphabeticIndexCompat extends BaseAlphabeticIndex { + + private static final String MID_DOT = "\u2219"; + + private Object mAlphabeticIndex; + private Method mAddLabelsMethod; + private Method mSetMaxLabelCountMethod; + private Method mGetBucketIndexMethod; + private Method mGetBucketLabelMethod; + private boolean mHasValidAlphabeticIndex; + private String mDefaultMiscLabel; + + public AlphabeticIndexCompat(Context context) { + super(); + try { + Locale curLocale = context.getResources().getConfiguration().locale; + Class clazz = Class.forName("libcore.icu.AlphabeticIndex"); + Constructor ctor = clazz.getConstructor(Locale.class); + mAddLabelsMethod = clazz.getDeclaredMethod("addLabels", Locale.class); + mSetMaxLabelCountMethod = clazz.getDeclaredMethod("setMaxLabelCount", int.class); + mGetBucketIndexMethod = clazz.getDeclaredMethod("getBucketIndex", String.class); + mGetBucketLabelMethod = clazz.getDeclaredMethod("getBucketLabel", int.class); + mAlphabeticIndex = ctor.newInstance(curLocale); + try { + // Ensure we always have some base English locale buckets + if (!curLocale.getLanguage().equals(Locale.ENGLISH.getLanguage())) { + mAddLabelsMethod.invoke(mAlphabeticIndex, Locale.ENGLISH); + } + } catch (Exception e) { + e.printStackTrace(); + } + if (curLocale.getLanguage().equals(Locale.JAPANESE.getLanguage())) { + // Japanese character 他 ("misc") + mDefaultMiscLabel = "\u4ed6"; + // TODO(winsonc, omakoto): We need to handle Japanese sections better, especially the kanji + } else { + // Dot + mDefaultMiscLabel = MID_DOT; + } + mHasValidAlphabeticIndex = true; + } catch (Exception e) { + mHasValidAlphabeticIndex = false; + } + } + + /** + * Sets the max number of the label buckets in this index. + * (ICU 51 default is 99) + */ + public void setMaxLabelCount(int count) { + if (mHasValidAlphabeticIndex) { + try { + mSetMaxLabelCountMethod.invoke(mAlphabeticIndex, count); + } catch (Exception e) { + e.printStackTrace(); + } + } else { + super.setMaxLabelCount(count); + } + } + + /** + * Computes the section name for an given string {@param s}. + */ + public String computeSectionName(CharSequence cs) { + String s = Utilities.trim(cs); + String sectionName = getBucketLabel(getBucketIndex(s)); + if (Utilities.trim(sectionName).isEmpty() && s.length() > 0) { + int c = s.codePointAt(0); + boolean startsWithDigit = Character.isDigit(c); + if (startsWithDigit) { + // Digit section + return "#"; + } else { + boolean startsWithLetter = Character.isLetter(c); + if (startsWithLetter) { + return mDefaultMiscLabel; + } else { + // In languages where these differ, this ensures that we differentiate + // between the misc section in the native language and a misc section + // for everything else. + return MID_DOT; + } + } + } + return sectionName; + } + + /** + * Returns the index of the bucket in which {@param s} should appear. + * Function is synchronized because underlying routine walks an iterator + * whose state is maintained inside the index object. + */ + protected int getBucketIndex(String s) { + if (mHasValidAlphabeticIndex) { + try { + return (Integer) mGetBucketIndexMethod.invoke(mAlphabeticIndex, s); + } catch (Exception e) { + e.printStackTrace(); + } + } + return super.getBucketIndex(s); + } + + /** + * Returns the label for the bucket at the given index (as returned by getBucketIndex). + */ + protected String getBucketLabel(int index) { + if (mHasValidAlphabeticIndex) { + try { + return (String) mGetBucketLabelMethod.invoke(mAlphabeticIndex, index); + } catch (Exception e) { + e.printStackTrace(); + } + } + return super.getBucketLabel(index); + } +} |