实现TextView中link的点击效果

Posted 2020-09-18 yxysuanfa

朋友们，你们在TextView处理link的时候是不是一直被苦逼的android默认的方式困扰？每次点击link的时候，点击效果是整个textview来响应。非常烂吧？原因就不多赘述了。

那么以下这个控件就适合你了。 gitbub的链接：https://github.com/zhangjizxc/LinkClickTextView

好用的话。帮忙点个赞。

 

package com.zhang.linkclick;

import com.test.zhang.R;

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.os.Handler;
import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.style.ClickableSpan;
import android.text.style.ForegroundColorSpan;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.widget.TextView;

/**
 * 
 * @author zhangji
 *
 */
public class LinkClickTextView extends TextView {

    private static final String TAG = "LinkClickTextView";
    private ClickableSpan mSelectedLink;
    private boolean mHasPerformedLongPress;
    private CheckForLongPress mPendingCheckForLongPress;
    private ForegroundColorSpan mForegroundColorSpan;
    private UnsetLinkPressedState mUnsetLinkPressedState;

    public LinkClickTextView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public LinkClickTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setLinksClickable(false);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LinkClickTextView, defStyle, 0);
        ColorStateList titleColor = a.getColorStateList(R.styleable.LinkClickTextView_textColorLinkClick);
        if (titleColor != null) {
            mForegroundColorSpan =new ForegroundColorSpan(titleColor.getColorForState(EMPTY_STATE_SET, Color.RED));
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean handled = handledLinkTouch(event);

        if (handled) {
            return true;
        } else {
            return super.onTouchEvent(event);
        }
    }

    @Override
    public void cancelLongPress() {
        removeLongPressCallback();
        super.cancelLongPress();
    }

    @Override
    protected void onDetachedFromWindow() {
        removeLongPressCallback();
        super.onDetachedFromWindow();
    }

    private boolean handledLinkTouch(MotionEvent event) {

        CharSequence text = getText();
        int pointCount = event.getPointerCount();
        if (!(text instanceof Spannable) || pointCount > 1) {
            return false;
        }
        int action = event.getAction();
        Spannable buffer = (Spannable) text;
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                int x = (int) event.getX();
                int y = (int) event.getY();

                x -= this.getTotalPaddingLeft();
                y -= this.getTotalPaddingTop();

                x += this.getScrollX();
                y += this.getScrollY();

                Layout layout = this.getLayout();
                int line = layout.getLineForVertical(y);
                int off = layout.getOffsetForHorizontal(line, x);

                ClickableSpan[] link = buffer.getSpans(off, off, ClickableSpan.class);
                if (link.length != 0) {
                    checkForLongClick(0);
                    mSelectedLink = link[0];
                    setLinkPressed(true);
                    return true;
                } else {
                    mSelectedLink = null;
                }
                break;
            case MotionEvent.ACTION_MOVE:
                if (mSelectedLink != null) {
                    return true;
                }
                break;
            case MotionEvent.ACTION_UP:
                if (mSelectedLink != null) {
                    if (!mHasPerformedLongPress) {
                        // This is a tap, so remove the longpress check
                        removeLongPressCallback();
                        mSelectedLink.onClick(this);
                    }
                    if (mUnsetLinkPressedState == null) {
                        mUnsetLinkPressedState = new UnsetLinkPressedState();
                    }
                    postDelayed(mUnsetLinkPressedState,
                            ViewConfiguration.getPressedStateDuration());
                    mSelectedLink = null;
                    return true;
                }
                break;
            case MotionEvent.ACTION_CANCEL:
                removeLongPressCallback();
                break;
            default:
                break;
        }
        return false;
    }

    private void checkForLongClick(int delayOffset) {
        if (isLongClickable()) {
            mHasPerformedLongPress = false;

            if (mPendingCheckForLongPress == null) {
                mPendingCheckForLongPress = new CheckForLongPress();
            }
            mPendingCheckForLongPress.rememberWindowAttachCount();
            postDelayed(mPendingCheckForLongPress,
                    ViewConfiguration.getLongPressTimeout() - delayOffset);
        }
    }

    private void removeLongPressCallback() {
        if (mPendingCheckForLongPress != null) {
            removeCallbacks(mPendingCheckForLongPress);
        }
    }

    class CheckForLongPress implements Runnable {

        private int mOriginalWindowAttachCount;

        public void run() {
            if (mOriginalWindowAttachCount == getWindowAttachCount()) {
                if (performLongClick()) {
                    mHasPerformedLongPress = true;
                }
            }
        }

        public void rememberWindowAttachCount() {
            mOriginalWindowAttachCount = getWindowAttachCount();
        }
    }

    private void setLinkPressed(boolean pressed) {
        if (!(getText() instanceof Spannable) || mForegroundColorSpan == null) {
            return;
        }
        Spannable buffer = (Spannable) getText();
        if (buffer == null) {
            return;
        }
        if (pressed) {
            buffer.setSpan(mForegroundColorSpan, buffer.getSpanStart(mSelectedLink),
                    buffer.getSpanEnd(mSelectedLink), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        } else {
            buffer.removeSpan(mForegroundColorSpan);
        }
    }

    private final class UnsetLinkPressedState implements Runnable {
        public void run() {
            setLinkPressed(false);
        }
    }
}