我有一个很长的文本，我想分成多页。我还需要一种方法来设置这个文本的样式。
问问题
5706 次
1 回答
15
更新：我创建了示例应用程序，展示了如何使用 PageSplitter。
这个怎么运作？示例应用程序（俄语）- Cleverum。你只需要PageSplitter上课。其他代码向您展示了如何使用此类。
import android.graphics.Typeface;
import android.text.SpannableString;
import android.text.SpannableStringBuilder;
import android.text.TextPaint;
import android.text.style.StyleSpan;
import java.util.ArrayList;
import java.util.List;
public class PageSplitter {
private final int pageWidth;
private final int pageHeight;
private final float lineSpacingMultiplier;
private final int lineSpacingExtra;
private final List<CharSequence> pages = new ArrayList<CharSequence>();
private SpannableStringBuilder currentLine = new SpannableStringBuilder();
private SpannableStringBuilder currentPage = new SpannableStringBuilder();
private int currentLineHeight;
private int pageContentHeight;
private int currentLineWidth;
private int textLineHeight;
public PageSplitter(int pageWidth, int pageHeight, float lineSpacingMultiplier, int lineSpacingExtra) {
this.pageWidth = pageWidth;
this.pageHeight = pageHeight;
this.lineSpacingMultiplier = lineSpacingMultiplier;
this.lineSpacingExtra = lineSpacingExtra;
}
public void append(String text, TextPaint textPaint) {
textLineHeight = (int) Math.ceil(textPaint.getFontMetrics(null) * lineSpacingMultiplier + lineSpacingExtra);
String[] paragraphs = text.split("\n", -1);
int i;
for (i = 0; i < paragraphs.length - 1; i++) {
appendText(paragraphs[i], textPaint);
appendNewLine();
}
appendText(paragraphs[i], textPaint);
}
private void appendText(String text, TextPaint textPaint) {
String[] words = text.split(" ", -1);
int i;
for (i = 0; i < words.length - 1; i++) {
appendWord(words[i] + " ", textPaint);
}
appendWord(words[i], textPaint);
}
private void appendNewLine() {
currentLine.append("\n");
checkForPageEnd();
appendLineToPage(textLineHeight);
}
private void checkForPageEnd() {
if (pageContentHeight + currentLineHeight > pageHeight) {
pages.add(currentPage);
currentPage = new SpannableStringBuilder();
pageContentHeight = 0;
}
}
private void appendWord(String appendedText, TextPaint textPaint) {
int textWidth = (int) Math.ceil(textPaint.measureText(appendedText));
if (currentLineWidth + textWidth >= pageWidth) {
checkForPageEnd();
appendLineToPage(textLineHeight);
}
appendTextToLine(appendedText, textPaint, textWidth);
}
private void appendLineToPage(int textLineHeight) {
currentPage.append(currentLine);
pageContentHeight += currentLineHeight;
currentLine = new SpannableStringBuilder();
currentLineHeight = textLineHeight;
currentLineWidth = 0;
}
private void appendTextToLine(String appendedText, TextPaint textPaint, int textWidth) {
currentLineHeight = Math.max(currentLineHeight, textLineHeight);
currentLine.append(renderToSpannable(appendedText, textPaint));
currentLineWidth += textWidth;
}
public List<CharSequence> getPages() {
List<CharSequence> copyPages = new ArrayList<CharSequence>(pages);
SpannableStringBuilder lastPage = new SpannableStringBuilder(currentPage);
if (pageContentHeight + currentLineHeight > pageHeight) {
copyPages.add(lastPage);
lastPage = new SpannableStringBuilder();
}
lastPage.append(currentLine);
copyPages.add(lastPage);
return copyPages;
}
private SpannableString renderToSpannable(String text, TextPaint textPaint) {
SpannableString spannable = new SpannableString(text);
if (textPaint.isFakeBoldText()) {
spannable.setSpan(new StyleSpan(Typeface.BOLD), 0, spannable.length(), 0);
}
return spannable;
}
}
首先，您必须使用and （以像素为单位）创建PageSplitter对象，您可以从中获取and ：pageWidthpageHeightView.getWidth()View.getHeight()
ViewPager pagesView = (ViewPager) findViewById(R.id.pages);
PageSplitter pageSplitter = new PageSplitter(pagesView.getWidth(), pagesView.getHeight(), 1, 0);
lineSpacingMultiplier并且必须与将保留页面文本的 slineSpacingExtra具有相同的值lineSpacingMultiplier和lineSpacingExtra属性。TextView
使用PageSplitter.append()方法，您可以附加text将用以下方法测量textPaint：
TextPaint textPaint = new TextPaint();
textPaint.setTextSize(getResources().getDimension(R.dimen.text_size));
for (int i = 0; i < 1000; i++) {
pageSplitter.append("Hello, ", textPaint);
textPaint.setFakeBoldText(true);
pageSplitter.append("world", textPaint);
textPaint.setFakeBoldText(false);
pageSplitter.append("! ", textPaint);
if ((i + 1) % 200 == 0) {
pageSplitter.append("\n", textPaint);
}
}
然后通过使用PageSplitter.getPages()方法，您可以将原始文本拆分为页面并将它们中的每一个放入TextView：
pagesView.setAdapter(new TextPagerAdapter(getSupportFragmentManager(), pageSplitter.getPages()));
文本页面适配器：
public class TextPagerAdapter extends FragmentPagerAdapter {
private final List<CharSequence> pageTexts;
public TextPagerAdapter(FragmentManager fm, List<CharSequence> pageTexts) {
super(fm);
this.pageTexts = pageTexts;
}
@Override
public Fragment getItem(int i) {
return PageFragment.newInstance(pageTexts.get(i));
}
@Override
public int getCount() {
return pageTexts.size();
}
}
页面片段：
public class PageFragment extends Fragment {
private final static String PAGE_TEXT = "PAGE_TEXT";
public static PageFragment newInstance(CharSequence pageText) {
PageFragment frag = new PageFragment();
Bundle args = new Bundle();
args.putCharSequence(PAGE_TEXT, pageText);
frag.setArguments(args);
return frag;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
CharSequence text = getArguments().getCharSequence(PAGE_TEXT);
TextView pageView = (TextView) inflater.inflate(R.layout.page, container, false);
pageView.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources().getDimension(R.dimen.text_size));
pageView.setText(text);
return pageView;
}
}
R.layout.page在哪里
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="@dimen/text_size"
android:lineSpacingMultiplier="1"
android:lineSpacingExtra="0sp">
</TextView>
PageSplitter.renderToSpannable()text方法根据SpannableString设置包装textPaint。在当前的方法实现中，我只考虑TextPaint.isFakeBoldText()属性，但您也可以应用其他属性。例如，您可以TextPaint.getTextSize()使用AbsoluteSizeSpan.
于 2013-11-25T22:05:51.377 回答