android - tesis - Agregue "Ver más" al final de la vista de texto después de 3 líneas

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Question

Esta pregunta ya tiene una respuesta aquí:

• Android - TextView ampliable con Animación 11 respuestas

Quiero agregar la funcionalidad "Más" después de tres líneas de texto. El texto contiene la descripción que es más de 10 líneas. así que hemos decidido agregar "Más" después de tres líneas de texto. Me gusta:

cuando el texto muestre la descripción completa, debe mostrar el botón "Menos" al final del texto, que nuevamente comprime la vista de texto.

Answer 1

Esto romperá la línea si hay / r / n o / n en la cadena

public static void makeTextViewResizable(final TextView tv,
final int maxLine, final String expandText, final boolean viewMore) {
if (tv.getTag() == null) {
tv.setTag(tv.getText());
}
ViewTreeObserver vto = tv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@SuppressWarnings("deprecation")
@Override
public void onGlobalLayout() {
ViewTreeObserver obs = tv.getViewTreeObserver();
obs.removeGlobalOnLayoutListener(this);
if (maxLine == 0) {
int lineEndIndex = tv.getLayout().getLineEnd(0);
String text = tv.getText().subSequence(0,
lineEndIndex - expandText.length() + 1)
+ " " + expandText;
tv.setText(text);
tv.setMovementMethod(LinkMovementMethod.getInstance());
tv.setText(
addClickablePartTextViewResizable(tv.getText()
.toString(), tv, maxLine, expandText,
viewMore), BufferType.SPANNABLE);
} else if (maxLine > 0 && tv.getLineCount() >= maxLine) {
int lineEndIndex = tv.getLayout().getLineEnd(maxLine - 1);
String text = tv.getText().subSequence(0,
lineEndIndex - expandText.length() + 1)
+ " " + expandText;
tv.setText(text);
tv.setMovementMethod(LinkMovementMethod.getInstance());
tv.setText(
addClickablePartTextViewResizable(tv.getText()
.toString(), tv, maxLine, expandText,
viewMore), BufferType.SPANNABLE);
} else {
int lineEndIndex = tv.getLayout().getLineEnd(
tv.getLayout().getLineCount() - 1);
String text = tv.getText().subSequence(0, lineEndIndex)
+ " " + expandText;
tv.setText(text);
tv.setMovementMethod(LinkMovementMethod.getInstance());
tv.setText(
addClickablePartTextViewResizable(tv.getText()
.toString(), tv, lineEndIndex, expandText,
viewMore), BufferType.SPANNABLE);
}
}
});
}
private static SpannableStringBuilder addClickablePartTextViewResizable(
final String strSpanned, final TextView tv, final int maxLine,
final String spanableText, final boolean viewMore) {
SpannableStringBuilder ssb = new SpannableStringBuilder(strSpanned);
if (strSpanned.contains(spanableText)) {
ssb.setSpan(
new ClickableSpan() {
@Override
public void onClick(View widget) {
if (viewMore) {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(),
BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, -5, "...Read Less",
false);
tv.setTextColor(Color.BLACK);
} else {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(),
BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, 5, "...Read More",
true);
tv.setTextColor(Color.BLACK);
}
}
}, strSpanned.indexOf(spanableText),
strSpanned.indexOf(spanableText) + spanableText.length(), 0);
}
return ssb;
}

Answer 2

Aquí está mi simple TextView personalizado. En lugar de usar See More text, usa Compound Drawable en la parte inferior:

public class ExpandableTextView extends TextView implements OnClickListener
{
private static final int MAX_LINES = 5;
private int currentMaxLines = Integer.MAX_VALUE;
public ExpandableTextView(Context context)
{
super(context);
setOnClickListener(this);
}
public ExpandableTextView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
setOnClickListener(this);
}
public ExpandableTextView(Context context, AttributeSet attrs)
{
super(context, attrs);
setOnClickListener(this);
}
@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter)
{
/* If text longer than MAX_LINES set DrawableBottom - I''m using ''...'' icon */
post(new Runnable()
{
public void run()
{
if (getLineCount()>MAX_LINES)
setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, R.drawable.icon_more_text);
else
setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
setMaxLines(MAX_LINES);
}
});
}
@Override
public void setMaxLines(int maxLines)
{
currentMaxLines = maxLines;
super.setMaxLines(maxLines);
}
/* Custom method because standard getMaxLines() requires API > 16 */
public int getMyMaxLines()
{
return currentMaxLines;
}
@Override
public void onClick(View v)
{
/* Toggle between expanded collapsed states */
if (getMyMaxLines() == Integer.MAX_VALUE)
setMaxLines(MAX_LINES);
else
setMaxLines(Integer.MAX_VALUE);
}
}

Answer 3

Intenta esto puede ayudarte a trabajar bien conmigo.

 public class MainActivity extends Activity {
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.tv);
makeTextViewResizable(tv, 3, "View More", true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public static void makeTextViewResizable(final TextView tv, final int maxLine, final String expandText, final boolean viewMore) {
if (tv.getTag() == null) {
tv.setTag(tv.getText());
}
ViewTreeObserver vto = tv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@SuppressWarnings("deprecation")
@Override
public void onGlobalLayout() {
String text;
int lineEndIndex;
ViewTreeObserver obs = tv.getViewTreeObserver();
obs.removeGlobalOnLayoutListener(this);
if (maxLine == 0) {
lineEndIndex = tv.getLayout().getLineEnd(0);
text = tv.getText().subSequence(0, lineEndIndex - expandText.length() + 1) + " " + expandText;
} else if (maxLine > 0 && tv.getLineCount() >= maxLine) {
lineEndIndex = tv.getLayout().getLineEnd(maxLine - 1);
text = tv.getText().subSequence(0, lineEndIndex - expandText.length() + 1) + " " + expandText;
} else {
lineEndIndex = tv.getLayout().getLineEnd(tv.getLayout().getLineCount() - 1);
text = tv.getText().subSequence(0, lineEndIndex) + " " + expandText;
}
tv.setText(text);
tv.setMovementMethod(LinkMovementMethod.getInstance());
tv.setText(
addClickablePartTextViewResizable(Html.fromHtml(tv.getText().toString()), tv, lineEndIndex, expandText,
viewMore), BufferType.SPANNABLE);
}
});
}
private static SpannableStringBuilder addClickablePartTextViewResizable(final Spanned strSpanned, final TextView tv,
final int maxLine, final String spanableText, final boolean viewMore) {
String str = strSpanned.toString();
SpannableStringBuilder ssb = new SpannableStringBuilder(strSpanned);
if (str.contains(spanableText)) {
ssb.setSpan(new ClickableSpan() {
@Override
public void onClick(View widget) {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
tv.invalidate();
if (viewMore) {
makeTextViewResizable(tv, -1, "View Less", false);
} else {
makeTextViewResizable(tv, 3, "View More", true);
}
}
}, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);
}
return ssb;
}
}

ACTUALIZACIÓN: Eliminar UnderLine del texto de spaneble

1) Crear personalizado ClickableSpan

public class MySpannable extends ClickableSpan {
private boolean isUnderline = false;
/**
* Constructor
*/
public MySpannable(boolean isUnderline) {
this.isUnderline = isUnderline;
}
@Override
public void updateDrawState(TextPaint ds) {
ds.setUnderlineText(isUnderline);
ds.setColor(Color.parseColor("#343434"));
}
@Override
public void onClick(View widget) {
}
}

2) Cambio en el método addClickablePartTextViewResizable()

private static SpannableStringBuilder addClickablePartTextViewResizable(final Spanned strSpanned, final TextView tv,
final int maxLine, final String spanableText, final boolean viewMore) {
String str = strSpanned.toString();
SpannableStringBuilder ssb = new SpannableStringBuilder(strSpanned);
if (str.contains(spanableText)) {
ssb.setSpan(new MySpannable(false){
@Override
public void onClick(View widget) {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
tv.invalidate();
if (viewMore) {
makeTextViewResizable(tv, -1, "View Less", false);
} else {
makeTextViewResizable(tv, 3, "View More", true);
}
}
}, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);
}
return ssb;
}

Salida: