先直接上效果图

上图为实现目标,实现了Android图文混排,文字环绕,支持Span的识别,表情的嵌入,支持文字字体大小的设置等。
由于项目中需要用到图文混排技术,在此稍微研究了两天,出来一个效果还算不错的东西
图文混排技术,在不少Android应用中都已经实现,说穿了其实就是两个TextView加一个ImageView的布局罢了,代码里面实现下String的剪切就可以了,不过我这里的这个除了要实现混排效果外,还要支持Span,支持表情等,这就有点麻烦了。下面慢慢分解。先贴出RichTextImageView的布局。
<?xml version=”1.0″ encoding=”utf-8″?>
<!– com.demonzym.richtextdemo.RichTextImageView –>
<com.demonzym.richtextdemo.RichTextImageView xmlns:android=”http://schemas.android.com/apk/res/android”
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”
android:orientation=”vertical”
android:id=”@+id/richview” >
<LinearLayout
android:id=”@+id/linearLayout1″
android:layout_width=”fill_parent”
android:layout_height=”wrap_content” >
<RelativeLayout
android:id=”@+id/layout_preimage_isgif_left”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_weight=”0″
android:visibility=”gone” >
<ImageView
android:id=”@+id/preimage_statues_left”
android:layout_width=”134dip”
android:layout_height=”134dip”
android:background=”@drawable/preview_back”
android:cropToPadding=”true”
android:scaleType=”centerCrop”
android:src=”@drawable/preview_back_small” />
<ImageView
android:id=”@+id/preimage_isgif_left”
android:layout_width=”24dip”
android:layout_height=”17dip”
android:layout_alignBottom=”@+id/preimage_statues”
android:layout_alignRight=”@+id/preimage_statues”
android:layout_marginBottom=”9dip”
android:layout_marginRight=”7dip” />
</RelativeLayout>
<com.demonzym.richtextdemo.RichTextView
android:id=”@+id/lefttext”
android:layout_width=”wrap_content”
android:layout_height=”fill_parent”
android:layout_weight=”1″/>
<RelativeLayout
android:id=”@+id/layout_preimage_isgif_right”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_weight=”0″
android:visibility=”gone” >
<ImageView
android:id=”@+id/preimage_statues_right”
android:layout_width=”134dip”
android:layout_height=”134dip”
android:background=”@drawable/preview_back”
android:cropToPadding=”true”
android:scaleType=”centerCrop”
android:src=”@drawable/preview_back_small” />
<ImageView
android:id=”@+id/preimage_isgif_right”
android:layout_width=”24dip”
android:layout_height=”17dip”
android:layout_alignBottom=”@+id/preimage_statues”
android:layout_alignRight=”@+id/preimage_statues”
android:layout_marginBottom=”9dip”
android:layout_marginRight=”7dip” />
</RelativeLayout>
</LinearLayout>
<com.demonzym.richtextdemo.RichTextView
android:id=”@+id/bottomtext”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”/>
</com.demonzym.richtextdemo.RichTextImageView>
布局中的RichTextView是另外封装的一个实现Span的TextView,就是实现效果图中表情啊,@啊,#话题# 之类的,了解Span的都懂的,就不细说了。读者研究这个图文混排的时候,可以直接用TextView替代。
RichTextImageView 即本文中的图文混排的View。继承于LinearLayout,该类实现的关键代码如下:
public void setText(String t) {
mTopText.setText(“”);
mBottomText.setText(“”);
mTopText.setVisibility(View.INVISIBLE);
mBottomText.setVisibility(View.GONE);
bRequestBottomLayout = true;
if (t == null)
t = “”;
// Log.e(“setText”, t);
mTextContent = t;
mTopText.setText(mTextContent);
requestLayout();
}
public void setImage(int id) {
mImageContent = id;
mPreviewImage.setImageResource(id);
mPreview.setVisibility(View.VISIBLE);
if (!Util.isStringEmpty(mTextContent))
setText(mTextContent);
}
private void iniViews() {
mLinearLayout = (LinearLayout) findViewById(R.id.linearLayout1);
mTopText = (RichTextView) findViewById(R.id.lefttext);
mBottomText = (RichTextView) findViewById(R.id.bottomtext);
if(IMAGE_LOCATION == IMAGE_LOCATION_RIGHT){
mPreview = (RelativeLayout) findViewById(R.id.layout_preimage_isgif_right);
mPreviewImage = (ImageView) findViewById(R.id.preimage_statues_right);
mPreviewImageIsGif = (ImageView) findViewById(R.id.preimage_isgif_right);
}else if(IMAGE_LOCATION == IMAGE_LOCATION_LEFT){
mPreview = (RelativeLayout) findViewById(R.id.layout_preimage_isgif_left);
mPreviewImage = (ImageView) findViewById(R.id.preimage_statues_left);
mPreviewImageIsGif = (ImageView) findViewById(R.id.preimage_isgif_left);
}
}
public void setImageLocation(int l){
if(l != IMAGE_LOCATION_RIGHT && l != IMAGE_LOCATION_LEFT)
return;
else{
IMAGE_LOCATION = l;
mPreview.setVisibility(View.GONE);
iniViews();
setImage(mImageContent);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
super.onLayout(changed, l, t, r, b);
if (Util.isStringEmpty(mTextContent))
return;
// Log.e(“top text 宽 高”,
// mTopText.getWidth() + ” ” + mTopText.getHeight());
// Log.e(“top text 单行高度”, “” + mTopText.getLineHeight());
// Rect rect = getStringRect(mTextContent, mTopText.getPaint());
// Log.e(“文本的宽 高”, rect.width() + ” ” + rect.height());
// toptext最多能显示的行数
int topTextMaxRows = mTopText.getHeight() / mTopText.getLineHeight();
// 显示这些内容真实占用的行数
int textRows = mTopText.getLineCount();
// Log.e(“top text最多能显示的行数”, “” + topTextMaxRows);
// Log.e(“当前文本实际占用的行数”, “” + textRows);
//由于文本可能带有表情,重新计算显示行数,以保证显示正确
Rect lineR = new Rect();
int realH = 0; //toptext真实高度
int i = 0;
for(i = 0; i < topTextMaxRows; i++){
try{
mTopText.getLineBounds(i, lineR);
}catch(IndexOutOfBoundsException e){
break;
}
realH += lineR.height();
if(realH >= mTopText.getHeight())
break;
}
// Log.e(“当前view实际能显示的行数为”, “” + i);
topTextMaxRows = i;
//如果toptext显示不下的话,显示到bottomtext里面去
if (textRows >= topTextMaxRows && bRequestBottomLayout) {
// toptext最后一个可见字符的位置
int lastindex = mTopText.getLayout().getLineVisibleEnd(
topTextMaxRows – 1);
ClickableSpan[] cs = mTopText.getSpans();
int spanstart = 0;
int spanend = 0;
spanstring = “”;
STATE = 0; // 1网页 2人名 3话题
for (ClickableSpan c : cs) {
spanstart = mTopText.getSpanStart(c);
spanend = mTopText.getSpanEnd(c);
if (spanstart <= lastindex && spanend > lastindex) {
if (c instanceof LinkClickableSpan) {
// Log.e(“转角span类型”, “网页”);
spanstring = ((LinkClickableSpan) c).getLink();
STATE = 1;
}
if (c instanceof NameClickableSpan) {
// Log.e(“转角span类型”, “人名”);
spanstring = ((NameClickableSpan) c).getName();
STATE = 2;
}
if (c instanceof TopicClickableSpan) {
// Log.e(“转角span类型”, “话题”);
spanstring = ((TopicClickableSpan) c).getTopic();
STATE = 3;
}
break;
}
}
mTopText.setText(mTextContent.substring(0, lastindex));
mTopText.setVisibility(View.VISIBLE);
// 当行数不是整数时,调整内容会有下面半行没遮住,所以干脆都处理完以后再显示出来
mBottomText.setText(mTextContent.substring(lastindex,
mTextContent.length()) + mBottomText.getText().toString());
if (mBottomText.getText().length() > 0 && bRequestBottomLayout){
mBottomText.setVisibility(View.VISIBLE);
mHandler.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
mBottomText.requestLayout();
bRequestBottomLayout = false;
}
});
}
if (STATE != 0 || !bRequestBottomLayout) {
Log.e(“spanstring”, spanstring);
// Log.e(“”, “移除转角span”);
mTopText.getSpannable().removeSpan(mTopText.getSpans()[mTopText.getSpans().length – 1]);
switch (STATE) {
case 1:
mTopText.getSpannable().setSpan(
mTopText.new LinkClickableSpan(spanstring),
spanstart,
lastindex,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mBottomText.getSpannable().setSpan(
mBottomText.new LinkClickableSpan(spanstring),
0,
spanend – lastindex,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Log.e(“”, “网页”);
break;
case 2:
mTopText.getSpannable().setSpan(
mTopText.new NameClickableSpan(spanstring),
spanstart,
lastindex,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mBottomText.getSpannable().setSpan(
mBottomText.new NameClickableSpan(spanstring),
0,
spanend – lastindex,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Log.e(“”, “人名”);
break;
case 3:
mTopText.getSpannable().setSpan(
mTopText.new TopicClickableSpan(spanstring),
spanstart,
lastindex,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mBottomText.getSpannable().setSpan(
mBottomText.new TopicClickableSpan(spanstring),
0,
spanend – lastindex,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Log.e(“”, “话题”);
break;
}
mTopText.setText(mTopText.getSpannable(), BufferType.SPANNABLE);
mBottomText.setText(mBottomText.getSpannable(), BufferType.SPANNABLE);
}
}
}
说明下难点:
第一,转角处可能存在Span,比如一个话题 #话题话题话题话题话题话题话题话题话题#,可能一半内容在mTopText里面的最后一行显示,而另一半显示不下了,这就需要剪切剩余的String显示到mBottomText里面去,可是Span的内容就会出错,这就需要重新设置下转角处的Span效果了
第二,由于存在图片Span,会导致行高不正确,所以需要在获取到mTopText能显示的最多行数以后,重新判断一次是否正确,如果不正确的话,需要重新调整,不然mTopText会有一部分内容显示不下。
该View实现完成后,在布局中使用include条用,代码中find出来就可以直接使用了
不考虑Span的话,直接将代码中转角处理Span部分删除即可使用,我注释的挺清楚了
代码写的较急,可能有点乱,仅作交流
文章转自:http://blog.sina.com.cn/s/blog_47021dd401012szb.html
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