Android-如何在 textview 上显示文本选择? [英] Android- How can I show text selection on textview?

问题描述

我正在实现一个 epub 阅读应用程序，我使用 textview 来显示 epub 的文本.当用户长按 textview 时，我想从 textview 中选择文本，然后对 textview 的选定文本进行多项操作，例如突出显示等.那么，如何向用户显示这些光标以选择用户想要的任何文本.

I am implementing a epub reading app where I am using textview for showing text of epub. I want to select text from textview when user long presses on textview and then do multiple operations on selected text of textview like highlight etc.. So, How can I show those cursors to user to select text whatever user wants.

*我不想使用 EditText 并让它看起来像 textview.可能会优先使用覆盖文本视图.

*I dont want to use EditText and make it look like textview. May be overriding textview is prefered.

*我附上了截图来解释我在找什么-

*I have attached screenshot to explain what I am looking for-

推荐答案

这是很久以前问的，当时我自己也有这个问题.我自己为自己的应用 Jade Reader 制作了一个 Selectable TextView.我已将解决方案托管到 GitHub.(BitBucket 的代码与应用程序相关联，但更完整和完善.)

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.)

可选文本视图(在 GitHub 上)

Jade 阅读器(在 BitBucket 上)

使用以下代码将使您的 TextView 可选择.

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);
        }
    }
}

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