如何在 TextView 中的选定文本上设置侦听器 [英] How to set up a listener on the selected text in TextView

问题描述

我正在使用 ActionMode.Callback 但我需要知道文本何时完成选择...例如

I am using ActionMode.Callback but I need to know when the text has finished being selected... for example

推荐答案

in .xml:

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textIsSelectable="true" />

在.class中:

textview.setCustomSelectionActionModeCallback(new callback(textview));
...
public class callback implements Callback {

    private TextView mTextView;

    public callback(TextView text) {
        this.mTextView = text;

    }

    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        int start = mTextView.getSelectionStart();
        int end = mTextView.getSelectionEnd();
        Spannable wordtoSpan = (Spannable) mTextView.getText();

        switch (item.getItemId()) {

        case R.id.item_blue:
            wordtoSpan.setSpan(new BackgroundColorSpan(Color.BLUE), start
                    , end,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        singlenton.getInstance().getDatabase().createMarkText(mTextView,Color.BLUE);
            return true;

        case R.id.item_green:
            wordtoSpan.setSpan(new BackgroundColorSpan(Color.GREEN), start, end,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            singlenton.getInstance().getDatabase().createMarkText(mTextView,Color.GREEN);
            return true;

        case R.id.item_red:
            wordtoSpan.setSpan(new BackgroundColorSpan(Color.RED), start, end,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            singlenton.getInstance().getDatabase().createMarkText(mTextView,Color.RED);
            return true;
        case R.id.item_yellow:
            wordtoSpan.setSpan(new BackgroundColorSpan(Color.YELLOW), start, end,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            singlenton.getInstance().getDatabase().createMarkText(mTextView,Color.YELLOW);
            return true;
        case R.id.item_erase:
            wordtoSpan.setSpan(new BackgroundColorSpan(Color.TRANSPARENT), start, end,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            singlenton.getInstance().getDatabase().createMarkText(mTextView,Color.TRANSPARENT);
            return true;
        }
        return false;
    }

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        mode.setTitle("Selecione a cor");
        mode.getMenuInflater().inflate(R.menu.menu_text_context, menu);

        return true;
    }

    @Override
    public void onDestroyActionMode(ActionMode mode) {

    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        menu.removeItem(android.R.id.selectAll);
        // Remove the "cut" option
        menu.removeItem(android.R.id.cut);
        // Remove the "copy all" option
        menu.removeItem(android.R.id.copy);
        return true;
    }

}

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