要確定螢幕上的可見文本，請等待文字佈局完成，然後使用:
ViewTreeObserver vto = txtViewEx.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
ViewTreeObserver obs = txtViewEx.getViewTreeObserver();
obs.removeOnGlobalLayoutListener(this);
height = txtViewEx.getHeight();
scrollY = txtViewEx.getScrollY();
Layout layout = txtViewEx.getLayout();
firstVisibleLineNumber = layout.getLineForVertical(scrollY);
lastVisibleLineNumber = layout.getLineForVertical(height+scrollY);
}
});目標：當最後一條可見線完全適合視圖的高度時打破新頁面。
Pagination 類別實作必要的邏輯：
public class Pagination {
// Configuration parameters
private boolean mIncludePad;
private int mWidth;
private int mHeight;
private float mSpacingMult;
private float mSpacingAdd;
private CharSequence mText;
private TextPaint mPaint;
private List<CharSequence> mPages;
public Pagination(CharSequence text, int pageW, int pageH, TextPaint paint, float spacingMult, float spacingAdd, boolean inclidePad) {
// ... initialization ...
layout();
}
private void layout() {
// ... perform layout and pagination ...
}
}下面的範例將分頁套用到混合HTML 和Spanned 字串：
public class PaginationActivity extends Activity {
// ... code ...
private Pagination mPagination;
private CharSequence mText;
private int mCurrentIndex = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
// ... code ...
mText = TextUtils.concat(htmlString, spanString);
mTextView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
// ... code ...
mPagination = new Pagination(mText,
mTextView.getWidth(),
mTextView.getHeight(),
mTextView.getPaint(),
mTextView.getLineSpacingMultiplier(),
mTextView.getLineSpacingExtra(),
mTextView.getIncludeFontPadding());
update();
});
}
private void update() {
final CharSequence text = mPagination.get(mCurrentIndex);
if(text != null) mTextView.setText(text);
}
}考慮使用PagedTextView庫以更輕鬆地整合：
dependencies {
implementation 'com.github.onikx:pagedtextview:0.1.3'
}<com.onik.pagedtextview.PagedTextView
android:layout_width="match_parent"
android:layout_height="match_parent" />以上是Android中如何實現文字分頁？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
