móviles - manual de programacion android pdf

Cómo hacer clic en la parte de la vista de texto

Question

Tengo el texto " Android es una pila de software ". En este texto quiero establecer que se pueda hacer clic en el texto de " pila ". en el sentido de que si hace clic en eso se redireccionará a una nueva actividad (no en el navegador).

Lo intenté pero no lo estoy entendiendo.

Answer 1

Hice este método de ayuda en caso de que alguien necesite la posición inicial y final de una Cadena.

public static TextView createLink(TextView targetTextView, String completeString,
    String partToClick, ClickableSpan clickableAction) {

    SpannableString spannableString = new SpannableString(completeString);

    // make sure the String is exist, if it doesn''t exist
    // it will throw IndexOutOfBoundException
    int startPosition = completeString.indexOf(partToClick);
    int endPosition = completeString.lastIndexOf(partToClick) + partToClick.length();

    spannableString.setSpan(clickableAction, startPosition, endPosition,
        Spanned.SPAN_INCLUSIVE_EXCLUSIVE);

    targetTextView.setText(spannableString);
    targetTextView.setMovementMethod(LinkMovementMethod.getInstance());

    return targetTextView;
}

Y así es como lo usas

private void initSignUp() {
    String completeString = "New to Reddit? Sign up here.";
    String partToClick = "Sign up";
    ClickableTextUtil
        .createLink(signUpEditText, completeString, partToClick,
            new ClickableSpan() {
                @Override
                public void onClick(View widget) {
                    // your action
                    Toast.makeText(activity, "Start Sign up activity",
                        Toast.LENGTH_SHORT).show();
                }

                @Override
                public void updateDrawState(TextPaint ds) {
                    super.updateDrawState(ds);
                    // this is where you set link color, underline, typeface etc.
                    int linkColor = ContextCompat.getColor(activity, R.color.blumine);
                    ds.setColor(linkColor);
                    ds.setUnderlineText(false);
                }
            });
}

Answer 2

Mi función para hacer múltiples enlaces dentro de TextView

public void makeLinks(TextView textView, String[] links, ClickableSpan[] clickableSpans) {
    SpannableString spannableString = new SpannableString(textView.getText());
    for (int i = 0; i < links.length; i++) {
        ClickableSpan clickableSpan = clickableSpans[i];
        String link = links[i];

        int startIndexOfLink = textView.getText().toString().indexOf(link);
        spannableString.setSpan(clickableSpan, startIndexOfLink,
                startIndexOfLink + link.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
    textView.setHighlightColor(
            Color.TRANSPARENT); // prevent TextView change background when highlight
    textView.setMovementMethod(LinkMovementMethod.getInstance());
    textView.setText(spannableString, TextView.BufferType.SPANNABLE);
}

UTILIZANDO

textView.setLinkTextColor(Color.BLUE); // default link color for clickable span, we can also set it in xml by android:textColorLink=""
ClickableSpan normalLinkClickSpan = new ClickableSpan() {
    @Override
    public void onClick(View view) {
        Toast.makeText(getApplicationContext(), "Normal Link", Toast.LENGTH_SHORT).show();
    }

};

ClickableSpan noUnderLineClickSpan = new ClickableSpan() {
    @Override
    public void onClick(View view) {
        Toast.makeText(getApplicationContext(), "NoUnderLine Link", Toast.LENGTH_SHORT)
                .show();
    }

    @Override
    public void updateDrawState(TextPaint ds) {
        super.updateDrawState(ds);
        ds.setUnderlineText(false);
        ds.setColor(Color.MAGENTA); // specific color for this link
    }
};

ClickableSpan highlightClickSpan = new ClickableSpan() {
    @Override
    public void onClick(View view) {
        Toast.makeText(getApplicationContext(), "Highlight Link", Toast.LENGTH_SHORT)
                .show();
        view.invalidate(); // need put invalidate here to make text change to GREEN after clicked
    }

    @Override
    public void updateDrawState(TextPaint ds) {
        ds.setUnderlineText(false);
        if (textView.isPressed() && textView.getSelectionStart() != -1 && textView.getText()
                    .toString()
                    .substring(textView.getSelectionStart(), textView.getSelectionEnd())
                    .equals("Highlight Link")) {
                ds.setColor(Color.RED); // need put invalidate here to make text change to RED when pressed on Highlight Link                    textView.invalidate();
            } else {
                ds.setColor(Color.GREEN);
            }
            // dont put invalidate here because if you put invalidate here `updateDrawState` will called forever
    }
};

makeLinks(textView, new String[] {
        "Normal Link", "NoUnderLine Link", "Highlight Link"
}, new ClickableSpan[] {
        normalLinkClickSpan, noUnderLineClickSpan, highlightClickSpan
});

XML

<TextView
    android:id="@+id/myText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Please read Normal Link and NoUnderLine Link and Highlight Link"
    android:textSize="30sp"
    />

Answer 3

Para negrita,

mySpannable.setSpan(new StyleSpan(Typeface.BOLD),termStart,termStop,Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

Answer 4

Puede este método para establecer el valor cliqueable

public void setClickableString(String clickableValue, String wholeValue, TextView yourTextView){
    String value = wholeValue;
    SpannableString spannableString = new SpannableString(value);
    int startIndex = value.indexOf(clickableValue);
    int endIndex = startIndex + clickableValue.length();
    spannableString.setSpan(new ClickableSpan() {
                                @Override
                                public void updateDrawState(TextPaint ds) {
                                    super.updateDrawState(ds);
                                    ds.setUnderlineText(false); // <-- this will remove automatic underline in set span
                                }

                                @Override
                                public void onClick(View widget) {
                                    // do what you want with clickable value
                                }
                            }, startIndex, endIndex, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    yourTextView.setText(spannableString);
    yourTextView.setMovementMethod(LinkMovementMethod.getInstance()); // <-- important, onClick in ClickableSpan won''t work without this
}

Esta es la forma de usarlo:

TextView myTextView = findViewById(R.id.myTextView);
setClickableString("stack", "Android is a Software stack", myTextView);

Answer 5

Puede usar ClickableSpan como se describe en esta post

Código de muestra:

TextView myTextView = new TextView(this);
String myString = "Some text [clickable]";
int i1 = myString.indexOf("[");
int i2 = myString.indexOf("]");
myTextView.setMovementMethod(LinkMovementMethod.getInstance());
myTextView.setText(myString, BufferType.SPANNABLE);
Spannable mySpannable = (Spannable)myTextView.getText();
ClickableSpan myClickableSpan = new ClickableSpan() {
   @Override
   public void onClick(View widget) { /* do something */ }
};
mySpannable.setSpan(myClickableSpan, i1, i2 + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

Reference

Answer 6

Puedes usar código de muestra. Desea conocer detalles sobre ClickableSpan. Por favor revisa esta documentaion

  SpannableString myString = new SpannableString("This is example");

            ClickableSpan clickableSpan = new ClickableSpan() {
                    @Override
                    public void onClick(View textView) {
                        ToastUtil.show(getContext(),"Clicked Smile ");
                    }
                };

        //For Click
         myString.setSpan(clickableSpan,startIndex,lastIndex,Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)

        //For UnderLine
         myString.setSpan(new UnderlineSpan(),startIndex,lastIndex,0);

        //For Bold
        myString.setSpan(new StyleSpan(Typeface.BOLD),startIndex,lastIndex,0);

        //Finally you can set to textView. 

        TextView textView = (TextView) findViewById(R.id.txtSpan);
        textView.setText(myString);
        textView.setMovementMethod(LinkMovementMethod.getInstance());

Answer 7

android.text.style.ClickableSpan puede resolver su problema.

SpannableString ss = new SpannableString("Android is a Software stack");
ClickableSpan clickableSpan = new ClickableSpan() {
    @Override
    public void onClick(View textView) {
        startActivity(new Intent(MyActivity.this, NextActivity.class));
    }
    @Override
    public void updateDrawState(TextPaint ds) {
        super.updateDrawState(ds);
        ds.setUnderlineText(false);
    }
};
ss.setSpan(clickableSpan, 22, 27, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

TextView textView = (TextView) findViewById(R.id.hello);
textView.setText(ss);
textView.setMovementMethod(LinkMovementMethod.getInstance());
textView.setHighlightColor(Color.TRANSPARENT);

// En XML: TextView: android: textColorLink = "@ drawable / your_selector"

Answer 8

Versión de Kotlin de la respuesta de Phan Van Linh.

Tenga en cuenta que tiene algunas modificaciones menores.

fun makeLinks(textView: TextView, links: Array<String>, clickableSpans: Array<ClickableSpan>) {
    val spannableString = SpannableString(textView.text)

    for (i in links.indices) {
        val clickableSpan = clickableSpans[i]
        val link = links[i]

        val startIndexOfLink = textView.text.indexOf(link)

        spannableString.setSpan(clickableSpan, startIndexOfLink, startIndexOfLink + link.length,
                Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
    }

    textView.movementMethod = LinkMovementMethod.getInstance()
    textView.setText(spannableString, TextView.BufferType.SPANNABLE)
}

fun setupClickableTextView() {
    val termsOfServicesClick = object : ClickableSpan() {
        override fun onClick(p0: View?) {
            Toast.makeText(applicationContext, "ToS clicked", Toast.LENGTH_SHORT).show()
        }
    }

    val privacyPolicyClick = object : ClickableSpan() {
        override fun onClick(p0: View?) {
            Toast.makeText(applicationContext, "PP clicked", Toast.LENGTH_SHORT).show()
        }
    }

    makeLinks(termsTextView, arrayOf("terms", "privacy policy"), arrayOf(termsOfServicesClick, privacyPolicyClick))
}

Answer 9

 t= (TextView) findViewById(R.id.PP1);

 t.setText(Html.fromHtml("<bThis is normal text </b>" +
                "<a href=/"http://www.xyz-zyyx.com/">This is cliclable text</a> "));
 t.setMovementMethod(LinkMovementMethod.getInstance());