Androidは、文字のダイナミックで高亮な読み取り進捗効果を実現します。
本論文の例では、Androidによる文字の動的ハイライトの読み込み進捗を実現するための具体的なコードを共有します。参考にしてください。具体的な内容は以下の通りです。
1、効果図
歌詞の効果に似ています。下のテキストのオーディオを再生しながら、オーディオ再生の進捗状況とテキストのハイライトの進捗度は同じです。
2、コード構造と実現
簡単な類図:
ISubtitleViewインターフェースコードは以下の通りです。
処理中の文字位置のパラメータは注意が必要です。
以上が本文の全部です。皆さんの勉強に役に立つように、私たちを応援してください。
1、効果図
歌詞の効果に似ています。下のテキストのオーディオを再生しながら、オーディオ再生の進捗状況とテキストのハイライトの進捗度は同じです。
2、コード構造と実現
簡単な類図:
ISubtitleViewインターフェースコードは以下の通りです。
/**
*
* <p>
* < >
*
* @author : liuxs
* @date : 2021/3/18
*/
public interface ISubtitleView {
/**
*
* @return
*/
List<SubtitleItem> getSubtitleItemList();
/**
*
* @param linesTextList
*/
void setSubtitleItemList(List<SubtitleItem> linesTextList);
/**
* just like {@link #setSubtitleItemList(List)} , only call one of them
* @param duration
*/
void setDuration(long duration);
/**
* pts
* @param pts
*/
void updatePts(long pts);
/**
*
*/
void reset();
}
EMSubtitleView ：
/**
* view
* <p>
* < >
*
* @author : liuxs
* @date : 2021/3/17
*/
public class EMSubtitleView extends android.support.v7.widget.AppCompatTextView implements ISubtitleView{
private int mMeasuredWidth;
private int mMeasuredHeight;
private List<SubtitleItem> mSubtitleItemList;
private List<LineEntity> mLinesTextList;
private Paint mNormalPaint;
private Paint mHLPaint;
private long mPts = 0;
private int mCurHLLine;
private float mReadSubtitleCount;
private Rect mLastHLRect;
private int mHLTextColor;
private long mDuration;
private boolean mIsPlain = false;
public EMSubtitleView(Context context) {
this(context , null);
}
public EMSubtitleView(Context context, AttributeSet attrs) {
this(context, attrs , 0);
}
public EMSubtitleView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mSubtitleItemList = new ArrayList<>();
mLinesTextList = null;
mLastHLRect = new Rect();
mNormalPaint = null;
initAttrs(attrs , defStyleAttr);
}
private void initAttrs(AttributeSet attrs , int defStyleAttr) {
TypedArray ta = getContext().obtainStyledAttributes(attrs , R.styleable.EMSubtitleView , defStyleAttr , R.style.EMSubtitleViewDefaultTheme);
for(int i = 0 ; i < ta.getIndexCount() ; i++){
int index = ta.getIndex(i);
if (index == R.styleable.EMSubtitleView_highLightTextColor) {
mHLTextColor = ta.getColor(index, getResources().getColor(R.color.emvideovisit_color_FF9000));
}
}
ta.recycle();
}
private void initHLPaint() {
mHLPaint = new Paint(mNormalPaint);
mHLPaint.setColor(mHLTextColor);
mHLPaint.setTextSize(getTextSize());
}
/**
*
*
* @param text
*/
public void setRichText(String text){
mIsPlain = false;
reset();
setText(text);
setDuration(mDuration , true);
}
/**
*
* textView
* @param text
*/
public void setPlainText(String text){
mIsPlain = true;
reset();
setText(text);
}
@Override
protected void onDraw(Canvas canvas) {
if (mMeasuredWidth == 0 || mMeasuredHeight == 0) {
mMeasuredWidth = getMeasuredWidth();
mMeasuredHeight = getMeasuredHeight();
}
if(mIsPlain){
super.onDraw(canvas);
return;
}
if(mNormalPaint == null){
super.onDraw(canvas);
mNormalPaint = getPaint();
initHLPaint();
return;
}
if(mLinesTextList == null){
fillLinesEntityListJustOnce();
}
// pts，
if(mPts <= 0){
drawNormalText(canvas);
return;
}
drawNormalText(canvas);
calculateReadLineAndWordsCount();
//
drawHLText(canvas);
}
private void drawHLText(Canvas canvas) {
if(mCurHLLine >= 0){
int curLineTextCount = 0;
for(int i = 0 ; i < mLinesTextList.size() ; ++i){
LineEntity entity = mLinesTextList.get(i);
if(mCurHLLine > i){
canvas.drawText( entity.lineText , entity.left , entity.baseLine , mHLPaint);
}else if(mCurHLLine == i && mReadSubtitleCount > 0 ){
canvas.save();
mLastHLRect.set(entity.left , entity.top , entity.left + (int) (mHLPaint.measureText(entity.lineText)*1.0f/entity.lineText.length()*(mReadSubtitleCount-curLineTextCount)), entity.bottom);
canvas.clipRect(mLastHLRect );
canvas.drawText( entity.lineText , entity.left , entity.baseLine , mHLPaint);
canvas.restore();
//
if(entity.baseLine > getHeight()){
if(getScrollY() != entity.bottom - getHeight() + 1){
setScrollY( entity.bottom - getHeight() + 1/*- pts/40000 * mMeasuredHeight*/);
}
}
break;
}
curLineTextCount += entity.lineText.length();
}
}
}
private void calculateReadLineAndWordsCount() {
float curSubtitleCount = 0;
for(SubtitleItem subtitleItem : mSubtitleItemList){
// ， mCurHLLine -1；
if(mPts >= subtitleItem.getStartTime() && mPts < subtitleItem.getEndTime()){
float lineOffset = (subtitleItem.getWords().length()*1.0f/(subtitleItem.getEndTime() - subtitleItem.getStartTime()))*(mPts-subtitleItem.getStartTime());
curSubtitleCount += lineOffset;
int curLineTextCount = 0;
for(int i = 0 ; i < mLinesTextList.size() ; ++i){
curLineTextCount += mLinesTextList.get(i).lineText.length();
if(curLineTextCount > curSubtitleCount){
mCurHLLine = i;
break;
}
}
break;
}
curSubtitleCount += subtitleItem.getWords().length();
}
mReadSubtitleCount = curSubtitleCount;
}
private void fillLinesEntityListJustOnce() {
if(mLinesTextList != null){
return;
}
mLinesTextList = new ArrayList<>();
Layout layout = getLayout();
int line=getLayout().getLineCount();
String text=layout.getText().toString();
for(int i=0;i<line;i++){
int start=layout.getLineStart(i);
int end=layout.getLineEnd(i);
int left = (int) layout.getLineLeft(i);
int baseLine = layout.getLineBaseline(i);
Paint.FontMetrics fontMetrics = getPaint().getFontMetrics();
int top = (int) (baseLine + fontMetrics.top);
int bottom = (int) (baseLine + fontMetrics.bottom);
int ascent = (int) (baseLine + fontMetrics.ascent);
int descent = (int) (baseLine + fontMetrics.descent);
mLinesTextList.add(new LineEntity(text.substring(start, end) , top , bottom , ascent , descent ,baseLine , left));
}
}
private void drawNormalText(Canvas canvas) {
for(LineEntity entity : mLinesTextList){
canvas.drawText(entity.lineText, entity.left, entity.baseLine , mNormalPaint);
}
}
public List<SubtitleItem> getSubtitleItemList() {
return mSubtitleItemList;
}
/**
*
* @param linesTextList
*/
public void setSubtitleItemList(List<SubtitleItem> linesTextList) {
if(mSubtitleItemList != null){
mSubtitleItemList.clear();
mSubtitleItemList.addAll(linesTextList);
}else{
this.mSubtitleItemList = linesTextList;
}
}
/**
* must first call setText,then call here
* @param duration
*/
public void setDuration(long duration){
setDuration( duration , false);
}
private void setDuration(long duration , boolean force){
if((duration > 0 && mDuration != duration) || force){
mDuration = duration;
if(mSubtitleItemList != null){
mSubtitleItemList.clear();
}else{
this.mSubtitleItemList = new ArrayList<>();
}
mSubtitleItemList.add(new SubtitleItem(getText().toString() , 0 , duration));
}
}
/**
* pts
* @param pts
*/
public void updatePts(long pts){
mPts = pts;
postInvalidate();
}
/**
*
*/
public void reset(){
mPts = 0;
mCurHLLine = 0;
mReadSubtitleCount = 0;
mLinesTextList = null;
mNormalPaint = null;
setScrollY(0);
postInvalidate();
}
static class LineEntity{
String lineText;
int top;
int bottom;
int ascent;
int descent;
int baseLine;
int left;
public LineEntity(String lineText, int top, int bottom, int ascent, int descent, int baseLine, int left) {
this.lineText = lineText;
this.top = top;
this.bottom = bottom;
this.ascent = ascent;
this.descent = descent;
this.baseLine = baseLine;
this.left = left;
}
}
}
<com.eastmoney.emvideovisit.view.EMSubtitleView
android:id="@+id/play_text"
android:layout_width="match_parent"
android:layout_height="@dimen/emvideovisit_dp_60"
android:layout_marginLeft="@dimen/emvideovisit_dp_60"
android:layout_marginRight="@dimen/emvideovisit_dp_60"
android:gravity="center_horizontal"
android:layout_marginTop="@dimen/emvideovisit_dp_20"
android:textColor="#fff"
app:highLightTextColor="#A6EA5504"
android:text="@string/emvideovisit_string_headset_tips"
android:textSize="@dimen/emvideovisit_dp_16"
android:layout_marginBottom="@dimen/emvideovisit_dp_4"/>処理中の文字位置のパラメータは注意が必要です。
以上が本文の全部です。皆さんの勉強に役に立つように、私たちを応援してください。