在开发中,不免针对部分文字进行特殊的颜色显示,一开始,我用很low的办法就是TextView来拼接,这样既浪费时间又影响性能,所以这总结一下,当然使用Spannable来设置,网上一大堆案例,就不用多介绍,这里介绍一种Html来实现,也有大神写好了工具类
html实现字体颜色变化.png
其原理就是使用html里面的font标签,让字体的颜色和大小变化
String str = "这是第一个<font color='#ff0000'>红色字体</font>的标签";
当我们将这个字符串以Html的方式加载的时候,就会显示出对应的红色字体
textView.setText(Html.fromHtml(str));
Html方式的红色字体
这种方式非常简单,还可以使用size,span等各种html标签实现字体大小,为此我封装了一个方法,可以当做工具类使用,缺点是只能设置一种颜色
/***
*
* @param text 文字
* @param color 颜色
* @param childStrArr 需要变色的文字
* @return
*可变数组中,可以传入多个想改变的文字
*/
public StringBuffer setTextColor(String text, String color,String... childStrArr ) {
StringBuffer stringBuffer = new StringBuffer(text);
for (int i = 0; i < childStrArr.length; i++) {
if(text.contains(childStrArr[i])){
stringBuffer.insert(stringBuffer.indexOf(childStrArr[i]), "<font color='" + color + "'>");
stringBuffer.insert(stringBuffer.indexOf(childStrArr[i]) + childStrArr[i].length(), "</font>");
}
}
return stringBuffer;
}
TextView的setMovementMethod方法可以针对Html设置点击时间,这样变色部分就可以响应点击事件
我自定义了一个LinkMovementMethod类,解决其点击的响应,使用中,重写onLinkClicked方法即可
import android.content.Context;
import android.text.Layout;
import android.text.Spannable;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.text.style.URLSpan;
import android.util.Log;
import android.util.Patterns;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.TextView;
/**
* Created by wangjianfeng on 16/11/22.
* 自定义LinkMovementMethod类,返回超链接的url地址
*/
public class TextViewClickMovement extends LinkMovementMethod {
private final String TAG = TextViewClickMovement.class.getSimpleName();
private final OnTextViewClickMovementListener mListener;
private final GestureDetector mGestureDetector;
private TextView mWidget;
private Spannable mBuffer;
public enum LinkType {
/**
* Indicates that phone link was clicked
*/
PHONE,
/**
* Identifies that URL was clicked
*/
WEB_URL,
/**
* Identifies that Email Address was clicked
*/
EMAIL_ADDRESS,
/**
* Indicates that none of above mentioned were clicked
*/
NONE
}
/**
* Interface used to handle Long clicks on the {@link TextView} and taps
* on the phone, web, mail links inside of {@link TextView}.
*/
public interface OnTextViewClickMovementListener {
/**
* This method will be invoked when user press and hold
* finger on the {@link TextView}
*
* @param linkText Text which contains link on which user presses.
* @param linkType Type of the link can be one of {@link LinkType} enumeration
*/
void onLinkClicked(final String linkText, final LinkType linkType);
/**
* @param text Whole text of {@link TextView}
*/
void onLongClick(final String text);
}
public TextViewClickMovement(final OnTextViewClickMovementListener listener, final Context context) {
mListener = listener;
mGestureDetector = new GestureDetector(context, new SimpleOnGestureListener());
}
@Override
public boolean onTouchEvent(final TextView widget, final Spannable buffer, final MotionEvent event) {
mWidget = widget;
mBuffer = buffer;
mGestureDetector.onTouchEvent(event);
return false;
}
/**
* Detects various gestures and events.
* Notify users when a particular motion event has occurred.
*/
class SimpleOnGestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onDown(MotionEvent event) {
// Notified when a tap occurs.
return true;
}
@Override
public void onLongPress(MotionEvent e) {
// Notified when a long press occurs.
final String text = mBuffer.toString();
if (mListener != null) {
mListener.onLongClick(text);
}
}
@Override
public boolean onSingleTapConfirmed(MotionEvent event) {
// Notified when tap occurs.
final String linkText = getLinkText(mWidget, mBuffer, event);
LinkType linkType = LinkType.NONE;
if (Patterns.PHONE.matcher(linkText).matches()) {
linkType = LinkType.PHONE;
} else if (Patterns.WEB_URL.matcher(linkText).matches()) {
linkType = LinkType.WEB_URL;
} else if (Patterns.EMAIL_ADDRESS.matcher(linkText).matches()) {
linkType = LinkType.EMAIL_ADDRESS;
}
if (mListener != null) {
Log.d(TAG, "----> Tap Occurs on TextView with ID: " + mWidget.getId() + "\n" +
"Link Text: " + linkText + "\n" +
"Link Type: " + linkType + "\n<----");
mListener.onLinkClicked(linkText, linkType);
}
return false;
}
private String getLinkText(final TextView widget, final Spannable buffer, final MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
x -= widget.getTotalPaddingLeft();
y -= widget.getTotalPaddingTop();
x += widget.getScrollX();
y += widget.getScrollY();
Layout layout = widget.getLayout();
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line, x);
URLSpan[] link = buffer.getSpans(off, off, URLSpan.class);
if (link.length != 0) {
return link[0].getURL().toString();
}
return "";
}
private String getLinkString(final TextView widget, final Spannable buffer, final MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
x -= widget.getTotalPaddingLeft();
y -= widget.getTotalPaddingTop();
x += widget.getScrollX();
y += widget.getScrollY();
Layout layout = widget.getLayout();
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line, x);
ClickableSpan[] link = buffer.getSpans(off, off, ClickableSpan.class);
if (link.length != 0) {
return buffer.subSequence(buffer.getSpanStart(link[0]),
buffer.getSpanEnd(link[0])).toString();
}
return "";
}
}
}
网友评论