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com.github.jobs.widget.JellyBeanSpanFixTextView Maven / Gradle / Ivy
package com.github.jobs.widget;
import android.content.Context;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.util.AttributeSet;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
*
* A {@link TextView} that insert spaces around its text spans where needed to
* prevent {@link IndexOutOfBoundsException} in {@link #onMeasure(int, int)} on
* Jelly Bean.
*
* When {@link #onMeasure(int, int)} throws an exception, we try to fix the text
* by adding spaces around spans, until it works again. We then try removing
* some of the added spans, to minimize the insertions.
*
* The fix is time consuming (a few ms, it depends on the size of your text),
* but it should only happen once per text change.
*
* See http://code.google.com/p/android/issues/detail?id=35466
*
* @author "Pierre-Yves Ricau"
*/
public class JellyBeanSpanFixTextView extends TextView {
private static class FixingResult {
public final boolean fixed;
public final List spansWithSpacesBefore;
public final List spansWithSpacesAfter;
public static FixingResult fixed(List spansWithSpacesBefore, List spansWithSpacesAfter) {
return new FixingResult(true, spansWithSpacesBefore, spansWithSpacesAfter);
}
public static FixingResult notFixed() {
return new FixingResult(false, null, null);
}
private FixingResult(boolean fixed, List spansWithSpacesBefore, List spansWithSpacesAfter) {
this.fixed = fixed;
this.spansWithSpacesBefore = spansWithSpacesBefore;
this.spansWithSpacesAfter = spansWithSpacesAfter;
}
}
private static final String TAG = JellyBeanSpanFixTextView.class.getSimpleName();
public JellyBeanSpanFixTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public JellyBeanSpanFixTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public JellyBeanSpanFixTextView(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
try {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
} catch (IndexOutOfBoundsException e) {
fixOnMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
/**
* If possible, fixes the Spanned text by adding spaces around spans when
* needed.
*/
private void fixOnMeasure(int widthMeasureSpec, int heightMeasureSpec) {
CharSequence text = getText();
if (text instanceof Spanned) {
SpannableStringBuilder builder = new SpannableStringBuilder(text);
fixSpannedWithSpaces(builder, widthMeasureSpec, heightMeasureSpec);
} else {
fallbackToString(widthMeasureSpec, heightMeasureSpec);
}
}
/**
* Add spaces around spans until the text is fixed, and then removes the
* unneeded spaces
*/
private void fixSpannedWithSpaces(SpannableStringBuilder builder, int widthMeasureSpec, int heightMeasureSpec) {
long startFix = System.currentTimeMillis();
FixingResult result = addSpacesAroundSpansUntilFixed(builder, widthMeasureSpec, heightMeasureSpec);
if (result.fixed) {
removeUnneededSpaces(widthMeasureSpec, heightMeasureSpec, builder, result);
} else {
fallbackToString(widthMeasureSpec, heightMeasureSpec);
}
}
private FixingResult addSpacesAroundSpansUntilFixed(SpannableStringBuilder builder, int widthMeasureSpec, int heightMeasureSpec) {
Object[] spans = builder.getSpans(0, builder.length(), Object.class);
List spansWithSpacesBefore = new ArrayList(spans.length);
List spansWithSpacesAfter = new ArrayList(spans.length);
for (Object span : spans) {
int spanStart = builder.getSpanStart(span);
if (isNotSpace(builder, spanStart - 1)) {
builder.insert(spanStart, " ");
spansWithSpacesBefore.add(span);
}
int spanEnd = builder.getSpanEnd(span);
if (isNotSpace(builder, spanEnd)) {
builder.insert(spanEnd, " ");
spansWithSpacesAfter.add(span);
}
try {
setTextAndMeasure(builder, widthMeasureSpec, heightMeasureSpec);
return FixingResult.fixed(spansWithSpacesBefore, spansWithSpacesAfter);
} catch (IndexOutOfBoundsException notFixed) {
}
}
return FixingResult.notFixed();
}
private boolean isNotSpace(CharSequence text, int where) {
if (where < 0) {
return true;
}
return text.charAt(where) != ' ';
}
private void setTextAndMeasure(CharSequence text, int widthMeasureSpec, int heightMeasureSpec) {
setText(text);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
private void removeUnneededSpaces(int widthMeasureSpec, int heightMeasureSpec, SpannableStringBuilder builder, FixingResult result) {
for (Object span : result.spansWithSpacesAfter) {
int spanEnd = builder.getSpanEnd(span);
builder.delete(spanEnd, spanEnd + 1);
try {
setTextAndMeasure(builder, widthMeasureSpec, heightMeasureSpec);
} catch (IndexOutOfBoundsException ignored) {
builder.insert(spanEnd, " ");
}
}
boolean needReset = true;
for (Object span : result.spansWithSpacesBefore) {
int spanStart = builder.getSpanStart(span);
builder.delete(spanStart - 1, spanStart);
try {
setTextAndMeasure(builder, widthMeasureSpec, heightMeasureSpec);
needReset = false;
} catch (IndexOutOfBoundsException ignored) {
needReset = true;
int newSpanStart = spanStart - 1;
builder.insert(newSpanStart, " ");
}
}
if (needReset) {
setText(builder);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
private void fallbackToString(int widthMeasureSpec, int heightMeasureSpec) {
String fallbackText = getText().toString();
setTextAndMeasure(fallbackText, widthMeasureSpec, heightMeasureSpec);
}
}
