android - creating a strikethrough text?

Android - creating a strikethrough text?

To create a strikethrough text in Android, you can use a SpannableString along with StrikethroughSpan. Here's how you can achieve this programmatically:

Example Implementation

import android.graphics.Paint; import android.os.Bundle; import android.text.SpannableString; import android.text.Spanned; import android.text.style.StrikethroughSpan; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView textView = findViewById(R.id.textView); String textWithStrikeThrough = "This text has a strikethrough."; SpannableString spannableString = new SpannableString(textWithStrikeThrough); spannableString.setSpan(new StrikethroughSpan(), 0, textWithStrikeThrough.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); textView.setText(spannableString); } }

Explanation:

  1. TextView: You have a TextView (textView) in your layout (activity_main.xml in this case).

  2. SpannableString: Create a SpannableString object (spannableString) initialized with the text that you want to have a strikethrough.

  3. StrikethroughSpan: Apply the StrikethroughSpan to the spannableString. This span draws a line through the text.

  4. setText: Set the SpannableString with the strikethrough to the TextView using setText.

XML Layout (activity_main.xml):

This is the layout file (activity_main.xml) where you define your TextView:

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="18sp" android:textColor="@android:color/black" /> </RelativeLayout>

Notes:

  • SpannableString: Allows you to modify and style specific ranges of text within a TextView.
  • StrikethroughSpan: Applies a strikethrough effect to the text it is applied to.
  • Adjust text size, color, and other properties of the TextView as per your application's UI requirements.

This approach enables you to dynamically apply a strikethrough effect to text in your Android application, enhancing visual representation of deleted or outdated content, or any other use case where a strikethrough is appropriate.

Examples

  1. How to create a strikethrough text in TextView programmatically?

    • Description: Apply a strikethrough style to text dynamically in an Android TextView.
    • Code:
      TextView textView = findViewById(R.id.textView); textView.setPaintFlags(textView.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
    • Explanation: This code sets the strikethrough flag (STRIKE_THRU_TEXT_FLAG) on the TextView's Paint flags to render the text with a strikethrough.

  2. How to create a strikethrough text in XML layout?

    • Description: Define a TextView with strikethrough text style in XML layout.
    • Code:
      <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Sample Text" android:textStyle="strike" />
    • Explanation: Use android:textStyle="strike" to apply a strikethrough style directly in the XML layout.

  3. How to create a strikethrough text with custom color in TextView?

    • Description: Customize the strikethrough text color in an Android TextView.
    • Code:
      TextView textView = findViewById(R.id.textView); textView.setPaintFlags(textView.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); textView.setPaintFlags(textView.getPaintFlags() & (~Paint.LINEAR_TEXT_FLAG)); textView.setTextColor(Color.RED);
    • Explanation: This code snippet first sets the strikethrough flag and then changes the text color to red.

  4. How to create a strikethrough text in SpannableString?

    • Description: Use SpannableString to apply a strikethrough style to a specific portion of text.
    • Code:
      SpannableString spannableString = new SpannableString("Sample Text"); spannableString.setSpan(new StrikethroughSpan(), 0, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); TextView textView = findViewById(R.id.textView); textView.setText(spannableString);
    • Explanation: This code creates a SpannableString with a StrikethroughSpan applied to the entire text and sets it in a TextView.

  5. How to create a strikethrough text in a RecyclerView item?

    • Description: Implement a RecyclerView adapter to display items with strikethrough text based on a condition.
    • Code:
      public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { private List<String> items; @NonNull @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false); return new ViewHolder(view); } @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { String item = items.get(position); holder.textView.setText(item); if (someCondition) { holder.textView.setPaintFlags(holder.textView.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); } else { holder.textView.setPaintFlags(holder.textView.getPaintFlags() & (~Paint.STRIKE_THRU_TEXT_FLAG)); } } @Override public int getItemCount() { return items.size(); } public static class ViewHolder extends RecyclerView.ViewHolder { TextView textView; public ViewHolder(View itemView) { super(itemView); textView = itemView.findViewById(R.id.textView); } } }
    • Explanation: In onBindViewHolder method, apply strikethrough style based on a condition using Paint.STRIKE_THRU_TEXT_FLAG.

  6. How to toggle strikethrough text on click in TextView?

    • Description: Toggle the strikethrough style of text in a TextView when clicked.
    • Code:
      textView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if ((textView.getPaintFlags() & Paint.STRIKE_THRU_TEXT_FLAG) > 0) { textView.setPaintFlags(textView.getPaintFlags() & (~Paint.STRIKE_THRU_TEXT_FLAG)); } else { textView.setPaintFlags(textView.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); } } });
    • Explanation: This sets an OnClickListener on the TextView to toggle the strikethrough style on each click.

  7. How to create a strikethrough text animation in Android?

    • Description: Implement a strikethrough animation effect on TextView text.
    • Code:
      ObjectAnimator strikeThroughAnim = ObjectAnimator.ofFloat(textView, View.ALPHA, 1.0f, 0.0f); strikeThroughAnim.setDuration(1000); strikeThroughAnim.setRepeatMode(ValueAnimator.REVERSE); strikeThroughAnim.setRepeatCount(1); strikeThroughAnim.start();
    • Explanation: This example uses ObjectAnimator to animate the alpha property of the TextView to create a strikethrough effect.

  8. How to create a custom strikethrough drawable for TextView?

    • Description: Define and apply a custom drawable to simulate a strikethrough effect.
    • Code:
      <!-- custom_strikethrough.xml --> <layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <item android:bottom="1dp"> <shape android:shape="line"> <stroke android:width="2dp" android:color="@color/strikethrough_color" /> </shape> </item> </layer-list> 
      textView.setPaintFlags(textView.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); textView.setBackground(ContextCompat.getDrawable(context, R.drawable.custom_strikethrough));
    • Explanation: In this example, a custom drawable (custom_strikethrough.xml) is defined and applied to the TextView background to achieve a strikethrough effect.

  9. How to create a strikethrough text animation on RecyclerView items?

    • Description: Apply an animation effect to toggle strikethrough text in RecyclerView items.
    • Code:
      public void toggleStrikeThroughAnimation(final View view) { ObjectAnimator strikeThroughAnim = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, 0f, -view.getWidth()); strikeThroughAnim.setDuration(500); strikeThroughAnim.setInterpolator(new AccelerateDecelerateInterpolator()); strikeThroughAnim.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); view.setTranslationX(0f); } }); strikeThroughAnim.start(); }
    • Explanation: This method uses ObjectAnimator to animate the translationX property of the view to create a strikethrough animation effect.

  10. How to create a strikethrough text with a different style on hover or long press?

    • Description: Implement a different style or effect for strikethrough text when hovered or long-pressed.
    • Code:
      textView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { // Toggle strikethrough style here return true; } });
    • Explanation: This example sets a OnLongClickListener to apply a custom style or effect when long-pressing the TextView.

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