Android的TextView利用HTML类处理图片显示、字体样式
1 Spanned android.text.Html.fromHtml(String source)
输入的参数为（html格式的文本）
2 Spanned android.text.Html.fromHtml(String source, ImageGetter imageGetter, TagHandler tagHandler)
Source： 需处理的html文本
imageGetter ：对图片处理
tagHandler ：对标签进行处理
项目结构图：
一.MainActivity.java
package com.texthtml;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Environment;
import android.text.Html.ImageGetter;
import android.widget.TextView;
public class CImageGetter implements ImageGetter {
private Context context;
private TextView tv;
public CImageGetter(Context context, TextView tv) {
this.context = context;
this.tv = tv;
}
@Override
public Drawable getDrawable(String source) {
String imageName = Common.md5(source);
String sdcardPath = Environment.getExternalStorageDirectory().toString();
String[] ss = source.split("\\.");
String ext = ss[ss.length - 1];
String savePath = sdcardPath + "/" + context.getPackageName() + "/" + imageName + "." + ext;
File file = new File(savePath);
if (file.exists()) {
Drawable drawable = Drawable.createFromPath(savePath);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
return drawable;
}
Resources res = context.getResources();
URLDrawable drawable = new URLDrawable(res.getDrawable(R.drawable.ic_launcher));
new ImageAsync(drawable).execute(savePath, source);
return drawable;
}
private class ImageAsync extends AsyncTask<String, Integer, Drawable> {
private URLDrawable drawable;
public ImageAsync(URLDrawable drawable) {
this.drawable = drawable;
}
@Override
protected Drawable doInBackground(String... params) {
String savePath = params[0];
String url = params[1];
InputStream in = null;
try {
HttpGet http = new HttpGet(url);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(http);
BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(response.getEntity());
in = bufferedHttpEntity.getContent();
} catch (Exception e) {
try {
if (in != null)
in.close();
} catch (Exception e2) {
// TODO: handle exception
}
}
if (in == null) return drawable;
try {
File file = new File(savePath);
String basePath = file.getParent();
File basePathFile = new File(basePath);
if (!basePathFile.exists()) {
basePathFile.mkdirs();
}
file.createNewFile();
FileOutputStream fileout = new FileOutputStream(file);
byte[] buffer = new byte[4*1024];
while (in.read(buffer) != -1) {
fileout.write(buffer);
}
fileout.flush();
fileout.close(); //关闭流
Drawable mDrawable = Drawable.createFromPath(savePath);
return mDrawable;
} catch (Exception e) {
// TODO: handle exception
}
return drawable;
}
@Override
protected void onPostExecute(Drawable result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (result != null) {
drawable.setDrawable(result);
tv.setText(tv.getText()); // 更新UI
}
}
}
public class URLDrawable extends BitmapDrawable {
private Drawable drawable;
public URLDrawable(Drawable defaultDraw) {
setDrawable(defaultDraw);
}
private void setDrawable(Drawable nDrawable) {
drawable = nDrawable;
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
}
@Override
public void draw(Canvas canvas) {
drawable.draw(canvas);
}
}
}
二.CImageGetter.java 继承ImageGetter
public class CImageGetter implements ImageGetter {
private Context context;
private TextView tv;
public CImageGetter(Context context, TextView tv) {
this.context = context;
this.tv = tv;
}
@Override
public Drawable getDrawable(String source) {
String imageName = Common.md5(source);
String sdcardPath = Environment.getExternalStorageDirectory().toString();
String[] ss = source.split("\\.");
String ext = ss[ss.length - 1];
String savePath = sdcardPath + "/" + context.getPackageName() + "/" + imageName + "." + ext;
File file = new File(savePath);
if (file.exists()) {
Drawable drawable = Drawable.createFromPath(savePath);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
return drawable;
}
Resources res = context.getResources();
URLDrawable drawable = new URLDrawable(res.getDrawable(R.drawable.ic_launcher));
new ImageAsync(drawable).execute(savePath, source);
return drawable;
}
private class ImageAsync extends AsyncTask<String, Integer, Drawable> {
private URLDrawable drawable;
public ImageAsync(URLDrawable drawable) {
this.drawable = drawable;
}
@Override
protected Drawable doInBackground(String... params) {
String savePath = params[0];
String url = params[1];
InputStream in = null;
try {
HttpGet http = new HttpGet(url);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(http);
BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(response.getEntity());
in = bufferedHttpEntity.getContent();
} catch (Exception e) {
try {
if (in != null)
in.close();
} catch (Exception e2) {
// TODO: handle exception
}
}
if (in == null) return drawable;
try {
File file = new File(savePath);
String basePath = file.getParent();
File basePathFile = new File(basePath);
if (!basePathFile.exists()) {
basePathFile.mkdirs();
}
file.createNewFile();
FileOutputStream fileout = new FileOutputStream(file);
byte[] buffer = new byte[4*1024];
while (in.read(buffer) != -1) {
fileout.write(buffer);
}
fileout.flush();
fileout.close(); //关闭流
Drawable mDrawable = Drawable.createFromPath(savePath);
return mDrawable;
} catch (Exception e) {
// TODO: handle exception
}
return drawable;
}
@Override
protected void onPostExecute(Drawable result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (result != null) {
drawable.setDrawable(result);
tv.setText(tv.getText()); // 更新UI
}
}
}
public class URLDrawable extends BitmapDrawable {
private Drawable drawable;
public URLDrawable(Drawable defaultDraw) {
setDrawable(defaultDraw);
}
private void setDrawable(Drawable nDrawable) {
drawable = nDrawable;
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
}
@Override
public void draw(Canvas canvas) {
drawable.draw(canvas);
}
}
}
三.CTagHandler.java 继承TagHandler
public class CTagHandler implements TagHandler {
private Context context;
public CTagHandler(Context context) {
this.context = context;
}
@Override
public void handleTag(boolean opening, String tag, Editable output,
XMLReader xmlReader) {
if (tag.toLowerCase().equals("img")) {
int len = output.length();
ImageSpan[] images = output.getSpans(len-1, len, ImageSpan.class);
String imgURL = images[0].getSource();
output.setSpan(new ImageClick(context, imgURL), len-1, len, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
private class ImageClick extends ClickableSpan {
private String url;
private Context context;
public ImageClick(Context context, String url) {
this.context = context;
this.url = url;
}
@Override
public void onClick(View widget) {
String imageName = Common.md5(url);
String sdcardPath = Environment.getExternalStorageDirectory().toString(); // 获取SDCARD的路径
String[] ss = url.split("\\.");
String ext = ss[ss.length - 1];
String savePath = sdcardPath + "/" + context.getPackageName() + "/" + imageName + "." + ext;
File file = new File(savePath);
if (file.exists()) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "image/*");
context.startActivity(intent);
Log.i("Load","data");
}
}
}
}
一个公用类Common.java
public class Common {
public static String md5(String sourceStr) {
byte[] source = sourceStr.getBytes();
String s = null;
char hexDigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(source);
byte tmp[] = md.digest();
char[] str = new char[16 * 2];
int k = 0;
for (int i = 0; i < 16; i++) {
byte byte0 = tmp[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
s = new String(str);
} catch (Exception e) {
// TODO: handle exception
}
return s;
}
}
转自洪生鹏博客网站，原文地址：http://hongshengpeng.com/article/show/199.aspx