Selectable TextView for api level <=11

SelectableTextView.java

package sama.framework.controls.transparent.cotainer;

import android.content.Context;
import android.text.Layout;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.BackgroundColorSpan;
import android.text.style.ForegroundColorSpan;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewParent;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;

public class SelectableTextView extends TextView {

	public static int _SelectedBackgroundColor = 0xffA6D4E1;
	public static int _SelectedTextColor = 0xff000000;
	private OnTouchListener lastOnTouch;
	protected int textOffsetStart;
	protected int textOffsetEnd;
	private OnLongClickListener lastOnLongClick;
	protected boolean longCliked;
	protected boolean isDowned;
	protected int textSelectedEnd;
	protected int textSelectedStart;
	private static SelectableTextView lastInstance;

	public SelectableTextView(Context context) {
		super(context);
	}

	public void setTextIsSelectable(boolean selectable) {
		// TODO:ANDROID3
		// if:androidversion>=3
		// super.setTextIsSelectable(selectable);
		// else
		super.setLongClickable(true);
		super.setOnLongClickListener(getSelectableLongClick());
		super.setOnTouchListener(getSelectableOnTouch());
	}

	private OnLongClickListener getSelectableLongClick() {
		return new OnLongClickListener() {

			@Override
			public boolean onLongClick(View v) {
				longCliked = true;
				disableParentScrolling();
				if (lastOnLongClick != null) {
					lastOnLongClick.onLongClick(v);
				}
				return true;
			}
		};
	}

	@Override
	public void setOnTouchListener(OnTouchListener l) {
		super.setOnTouchListener(l);
		this.lastOnTouch = l;
	}

	@Override
	public void setOnLongClickListener(OnLongClickListener l) {
		super.setOnLongClickListener(l);
		this.lastOnLongClick = l;
	}

	private OnTouchListener getSelectableOnTouch() {
		return new OnTouchListener() {
			@Override
			public boolean onTouch(View v, MotionEvent event) {
				int action = event.getAction();

				if (action == MotionEvent.ACTION_DOWN) {
					if (lastInstance == null)
						lastInstance = SelectableTextView.this;
					if (lastInstance != null && lastInstance != SelectableTextView.this) {
						lastInstance.clean();
						lastInstance = SelectableTextView.this;
					}

					int offset = getOffset(event);
					if ((offset < textOffsetEnd && offset > textOffsetStart)
							|| (offset > textOffsetEnd && offset < textOffsetStart)) {
						if (textOffsetEnd - offset > offset - textOffsetStart)
							textOffsetStart = textOffsetEnd;
					} else {
						clean();
						textOffsetStart = offset;
					}
					isDowned = true;
				} else if (isDowned && longCliked && action == MotionEvent.ACTION_MOVE) {
					selectTextOnMove(event);
				} else if (action == MotionEvent.ACTION_UP) {
					isDowned = false;
					longCliked = false;
					enableParentScrolling();
				}
				if (lastOnTouch != null)
					lastOnTouch.onTouch(v, event);
				return false;
			}

		};
	}

	private void selectTextOnMove(MotionEvent event) {
		int offset = getOffset(event);
		if (offset != Integer.MIN_VALUE) {
			String text = getText().toString();
			SpannableStringBuilder sb = new SpannableStringBuilder(text);
			BackgroundColorSpan bgc = new BackgroundColorSpan(_SelectedBackgroundColor);
			ForegroundColorSpan textColor = new ForegroundColorSpan(_SelectedTextColor);

			int start = textOffsetStart;
			textOffsetEnd = offset;
			int end = offset;
			if (start > end) {
				int temp = start;
				start = end;
				end = temp;
			}
			int[] curectStartEnd = curectStartEnd(text, start, end);
			start = curectStartEnd[0];
			end = curectStartEnd[1];
			SelectableTextView.this.textSelectedStart = start;
			SelectableTextView.this.textSelectedEnd = end;
			sb.setSpan(bgc, start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
			sb.setSpan(textColor, start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);

			setText(sb);
		}
	}

	private int[] curectStartEnd(String text, int start, int end) {
		int length = text.length();

		while (start < length && start > 0 && text.charAt(start) != ' ') {
			start--;
		}
		while (end < length && text.charAt(end) != ' ') {
			end++;
		}
		return new int[] { start, end };
	}

	private int getOffset(MotionEvent event) {
		Layout layout = getLayout();
		if (layout == null)
			return Integer.MIN_VALUE;
		float x = event.getX() + getScrollX();
		float y = event.getY() + getScrollY();
		int line = layout.getLineForVertical((int) y);
		int offset = layout.getOffsetForHorizontal(line, x);
		return offset;
	}

	protected void clean() {
		if (this.getText() != null) {
			this.setText(this.getText().toString());
			textSelectedStart = 0;
			textSelectedEnd = 0;
		}
	}

	@Override
	public int getSelectionStart() {
		return textSelectedStart;
	}

	@Override
	public int getSelectionEnd() {
		return textSelectedEnd;
	}

	protected void enableParentScrolling() {
		ViewParent parent = this.getParent();
		if (parent == null) {
			this.setScrollContainer(false);
			return;
		}
		View v = (View) parent;
		while (v != null && !ScrollView.class.isAssignableFrom(v.getClass())
				&& !ListView.class.isAssignableFrom(v.getClass())) {
			v = (View) v.getParent();
		}
		if (ScrollView.class.isAssignableFrom(v.getClass())) {
			// TODO:FORM Custom ScrollView set stopMove
		} else if (SelectableListView.class.isAssignableFrom(v.getClass())) {
			((SelectableListView) v).stopMove = false;
		}
	}

	protected void disableParentScrolling() {
		ViewParent parent = this.getParent();
		if (parent == null) {
			this.setScrollContainer(false);
			return;
		}
		View v = (View) parent;
		while (v != null && !ScrollView.class.isAssignableFrom(v.getClass())
				&& !ListView.class.isAssignableFrom(v.getClass())) {
			v = (View) v.getParent();
		}
		if (ScrollView.class.isAssignableFrom(v.getClass())) {
			// TODO:FORM Custom ScrollView set stopMove
		} else if (SelectableListView.class.isAssignableFrom(v.getClass())) {
			((SelectableListView) v).stopMove = true;
		}
	}
}