Android- How can I show text selection on textview?

Solution 1:

This is asked long time ago, when I had this problem myself as well. I made a Selectable TextView myself for my own app Jade Reader. I've hosted the solution to GitHub. (The code at BitBucket ties to the application, but it's more complete and polished.)

Selectable TextView (on GitHub)

Jade Reader (on BitBucket)

Using the following code will make your TextView selectable.

package com.zyz.mobile.example;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;

public class MainActivity extends Activity {

    private SelectableTextView mTextView;
    private int mTouchX;
    private int mTouchY;
    private final static int DEFAULT_SELECTION_LEN = 5;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // make sure the TextView's BufferType is Spannable, see the main.xml
        mTextView = (SelectableTextView) findViewById(R.id.main_text);
        mTextView.setDefaultSelectionColor(0x40FF00FF);


        mTextView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                showSelectionCursors(mTouchX, mTouchY);
                return true;
            }
        });
        mTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mTextView.hideCursor();
            }
        });
        mTextView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                mTouchX = (int) event.getX();
                mTouchY = (int) event.getY();
                return false;
            }
        });
    }

    private void showSelectionCursors(int x, int y) {
        int start = mTextView.getPreciseOffset(x, y);

        if (start > -1) {
            int end = start + DEFAULT_SELECTION_LEN;
            if (end >= mTextView.getText().length()) {
                end = mTextView.getText().length() - 1;
            }
            mTextView.showSelectionControls(start, end);
        }
    }
}

Solution 2:

It depends on the minimum Android version that you'd like to support.

On 3.0+, you have the textIsSelectable attribute on the TextView, which enables this behavior. E.g.:

<TextView android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:padding="@dimen/padding_medium"
        android:text="@string/hello_world"
        android:bufferType="spannable"
        android:textIsSelectable="true"
        android:textSize="28dip"
        tools:context=".MainActivity" />

Below that, you best bet is to use an EditText that looks and behaves like a TextView (apart from the slection thing). Or you can implement this feature yourself using spans.