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更改游戏详情的自定义栏目富文本正文的展开实现

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This commit is contained in:
chenjuntao
2020-06-23 11:58:27 +08:00
parent 78d5cbcc42
commit 3fd34576e8
7 changed files with 255 additions and 80 deletions
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72
app/src/main/java/com/gh/common/view/ExpandTextView.java
View File

@ -8,6 +8,7 @@ import android.text.Layout;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.TextPaint;
import android.text.TextUtils;
import android.text.style.ClickableSpan;
import android.util.AttributeSet;
import android.view.View;
@ -23,9 +24,11 @@ public class ExpandTextView extends AppCompatTextView {
private CharSequence mSnapshotText;
private String mEndText = "...";
private CharSequence mShrankText = "";
private String mExpandText = mEndText + "全文";
private CharSequence mExpandedText = "";
private boolean mUseGradientAlphaEndText = false;
private boolean mShrinkOnAnchor = false; // 以锚点所在的位置进行收起 (即 maxLines = 锚点所在的行)
private boolean mShowExpandTextRegardlessOfMaxLines = false;
private int mMaxLines = 3; // 由于sdk版本限制(getMaxLines) 这里设置默认值
@ -39,7 +42,6 @@ public class ExpandTextView extends AppCompatTextView {
private Rect mLastActualLineRect;
private static int DEFAULT_ADDITIONAL_END_TEXT_COUNT = 2;
public static final String SHRINK_ANCHOR = "☼";
public ExpandTextView(Context context) {
super(context);
@ -55,45 +57,33 @@ public class ExpandTextView extends AppCompatTextView {
mLastActualLineRect = new Rect();
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.ExpandTextView);
mShrinkOnAnchor = ta.getBoolean(R.styleable.ExpandTextView_shrinkOnAnchor, false);
mUseGradientAlphaEndText = ta.getBoolean(R.styleable.ExpandTextView_useGradientAlphaEndText, false);
mEndText = ta.getString(R.styleable.ExpandTextView_endText) == null ? mEndText : ta.getString(R.styleable.ExpandTextView_endText);
mExpandText = ta.getString(R.styleable.ExpandTextView_expandText) == null ? mExpandText : ta
.getString(R.styleable.ExpandTextView_expandText);
mExpandText = ta.getString(R.styleable.ExpandTextView_expandText) == null ? mExpandText : ta.getString(R.styleable.ExpandTextView_expandText);
ta.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mShrinkOnAnchor && getText().toString().contains(SHRINK_ANCHOR)) {
updateMaxLinesByShrinkAnchor();
// TODO 复用有问题
if (mShowExpandTextRegardlessOfMaxLines && !mIsExpanded) {
updateMaxLines();
}
setMeasuredDimension(getMeasuredWidth(), getMeasuredHeight() - getExtraBottomPadding());
}
private void updateMaxLinesByShrinkAnchor() {
int lineCount = getLineCount();
for (int line = 0; line < lineCount; line++) {
CharSequence substring = getText().subSequence(getLayout().getLineStart(line), getLayout().getLineEnd(line));
if (substring.toString().contains(SHRINK_ANCHOR)) {
if (mMaxLines != line + 1) {
if (!mIsExpanded) {
setExpandMaxLines(line + 1);
mMaxLinesCalculatedCallback.onMaxLinesCalculated(line + 1);
}
setText(findAndDeleteAnchor(getText()));
break;
}
}
}
private void updateMaxLines() {
mMaxLines = getLineCount() - 1;
mMaxLinesCalculatedCallback.onMaxLinesCalculated(getLineCount() - 1);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (mInitLayout && !mIsExpanded && getLineCount() > mMaxLines && mMaxLines > 0) {
mSnapshotText = findAndDeleteAnchor(getText());
if ((mShowExpandTextRegardlessOfMaxLines && !mIsExpanded)
|| (mInitLayout && !mIsExpanded && getLineCount() > mMaxLines && mMaxLines > 0)) {
mSnapshotText = getText();
mInitLayout = false;
showExpandButton();
}
@ -107,6 +97,18 @@ public class ExpandTextView extends AppCompatTextView {
this.mExpandCallback = callback;
}
public void setShrankTextAndExpandedText(CharSequence shrankText, CharSequence expandedText) {
mShrankText = shrankText;
mExpandedText = expandedText;
mShowExpandTextRegardlessOfMaxLines = !TextUtils.isEmpty(shrankText);
if (!mIsExpanded && mShowExpandTextRegardlessOfMaxLines) {
setText(mShrankText);
} else {
setText(mExpandedText);
}
}
@Override
public void setText(CharSequence text, BufferType type) {
mInitLayout = true;
@ -139,7 +141,7 @@ public class ExpandTextView extends AppCompatTextView {
if (viewWidth - lastLineRight > expandTextWidth) {
if (mUseGradientAlphaEndText) {
finalEndText = content.toString()
.substring(content.length() - additionalEndTextCount, content.length()) + mEndText;
.substring(content.length() - additionalEndTextCount, content.length()) + mEndText;
finalEndText = finalEndText.replace("\n", "");
content = content.subSequence(0, content.length() - additionalEndTextCount) + finalEndText + mExpandText;
@ -198,7 +200,11 @@ public class ExpandTextView extends AppCompatTextView {
public void onClick(@NonNull View widget) {
mIsExpanded = true;
setMaxLines(Integer.MAX_VALUE);
setText(mSnapshotText);
if (mShowExpandTextRegardlessOfMaxLines) {
setText(mExpandedText);
} else {
setText(mSnapshotText);
}
if (mExpandCallback != null) {
mExpandCallback.onExpand();
@ -229,7 +235,7 @@ public class ExpandTextView extends AppCompatTextView {
if (getMeasuredHeight() == getLayout().getHeight() - heightBetweenLastVisibleLineRectAndLastActualLineRect) {
result = mLastVisibleLineRect.bottom - (lastVisibleLineBaseline + layout.getPaint()
.getFontMetricsInt().descent + getPaddingBottom());
.getFontMetricsInt().descent + getPaddingBottom());
if (getLineSpacingExtra() > result) {
result = 0;
} else {
@ -240,18 +246,6 @@ public class ExpandTextView extends AppCompatTextView {
return result;
}
// 去掉锚点
private CharSequence findAndDeleteAnchor(CharSequence charSequence) {
int anchorIndex = charSequence.toString().indexOf(SHRINK_ANCHOR);
if (anchorIndex >= 0) {
SpannableStringBuilder sb = new SpannableStringBuilder(getText());
sb.delete(anchorIndex, anchorIndex + 1);
return sb;
} else {
return charSequence;
}
}
/**
* 此方法仅更改标记，不做实际展开的操作
*/