android 3 (API <=11) 组件中的新可选 TextView [英] new Selectable TextView in android 3 (API <=11) component

问题描述

经过漫长而耗时的搜索，我找不到可以在 textview for android API level <=11 中选择文本的组件.我写的这个组件可能对你有帮助:

After a long and time consuming search, I can't find a component that can select text in textview for android API level <=11. I have written this component that may be of help to you :

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;
            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;
            }
            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;
}

}

getOffset 获取 Touched 用户使用该组件设置这些属性的文本的选定偏移量:

getOffset get the selected offset of text that Touched user for using this component set these attributes:

        SelectableTextView textView1 = new SelectableTextView(context);
    textView1.setClickable(false);
    textView1.setCursorVisible(false);
    textView1.setOnTouchListener(getOnTextTouch());//new after text select touch
    textView1.setEnabled(this.selectable);
    textView1.setTextIsSelectable(this.selectable);

谁能升级这个组件?

这是git hub中的代码

推荐答案

由于this

    public SelectableTextView(Context context,AttributeSet attrs)
{
    super(context,attrs);
}

public SelectableTextView(Context context,AttributeSet attrs,int defStyle)
{
    super(context,attrs,defStyle);
}

我还在代码中添加了以下内容:

I have also added the following to the code:

    @SuppressLint("NewApi")
public void setTextIsSelectable(boolean selectable) {
    if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB)
        super.setTextIsSelectable(true);
    else
    {   
        super.setLongClickable(true);
        super.setOnLongClickListener(getSelectableLongClick());
        super.setOnTouchListener(getSelectableOnTouch());
    }
}

我是这样使用的，没有 OnTouchListener:

I used it like this,without an OnTouchListener:

txt_copyFrom.setClickable(false);
txt_copyFrom.setCursorVisible(false);
txt_copyFrom.setEnabled(true);
txt_copyFrom.setTextIsSelectable(true);
txt_copyFrom.setOnLongClickListener(new OnLongClickListener(){

    @Override
    public boolean onLongClick(View v) {
        int start=txt_copyFrom.getSelectionStart();
        int end=txt_copyFrom.getSelectionEnd();

        mSelectedText=txt_copyFrom.getText().toString().substring(start, end);
        Log.d(TAG, "Selected text: "+mSelectedText);
        return true;
    }

});

使用 XML:

<com.example.clipboardtest.SelectableTextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Old Buccaneer1The Old Sea-dog at the Admiral BenbowSquire Trelawney, Dr. Livesey, and the rest of these gentlemen having asked me to write down the whole particulars about Treasure Island, from the beginning to the end, keeping nothing back but the bearings of the island, and that only because there is still treasure not yet lifted, I take up my pen in the year of grace 17--and go back to the time when my father kept the Admiral Benbow inn and the brown old seaman with the sabre cut first took up his lodging under our roof."
    android:id="@+id/txt_copyfrom"
/>         

我想我必须在 OnLongClickListener 中为 Activity 本身的 TextView 设置一个 OnTouchListener.

I guess I have to set an OnTouchListener within the OnLongClickListener for the TextView in the Activity itself.

尝试将日志放在 SelectableTextView 中的所有位置，它似乎不起作用...我发现 LongClickListener 被调用但 TouchListener 甚至没有被调用...

Tried putting Logs all over the place in SelectableTextView,it does not seem to be working...I find that the LongClickListener is called but the TouchListener is not even called...

在 OnLongClickListener 中设置 OnTouchListener 做了 this

Setting the OnTouchListener inside the OnLongClickListener did this

这篇关于android 3 (API &lt;=11) 组件中的新可选 TextView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！