Android中TextView实现富文本展示效果

在项目中遇到这样一个问题，所有的内容都是html标签进行来写的，里面还有图片展示。于是，我在百度上一通问度娘，可是百度中展示的富文本内容，没有一个适合我的。都存在问题，经过一番搜索，最后进行解决了。

本文主要用来就是通过TextView来进行展示内容、图片。实现TextView加载富文本功能，废话我就不做过多的说，直接上代码。

代码如下:

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.graphics.drawable.LevelListDrawable;import android.os.AsyncTask;import android.text.Html;import android.util.Log;import android.widget.TextView;import com.wekair.app.R;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.net.MalformedURLException;import java.net.URL;import java.security.KeyManagementException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.security.cert.X509Certificate;import javax.net.ssl.HostnameVerifier;import javax.net.ssl.HttpsURLConnection;import javax.net.ssl.SSLContext;import javax.net.ssl.SSLSession;import javax.net.ssl.TrustManager;import javax.net.ssl.X509TrustManager;/** * File Name:HtmlImageGetter * Author:jinghui liu * Created Time:2017/12/13 16:58 */public class HtmlImageGetter implements Html.ImageGetter{    private Context context;    private final int widthPixels;    private TextView textView;    public HtmlImageGetter(Context context, TextView textView){        this.context = context;        this.textView = textView;        widthPixels = context.getResources().getDisplayMetrics().widthPixels;    }    /**     * 获取图片     */    @Override    public Drawable getDrawable(String source) {        LevelListDrawable d = new LevelListDrawable();        Drawable empty = context.getResources().getDrawable(                R.mipmap.img_default);        d.addLevel(0, 0, empty);        d.setBounds(0, 0,widthPixels,                empty.getIntrinsicHeight());        new LoadImage().execute(source, d);        return d;    }    /**     * 异步下载图片类     *     * @author Ruffian     * @date 2016年1月15日     *     */    class LoadImage extends AsyncTask<Object, Void, Bitmap> {        private LevelListDrawable mDrawable;        @Override        protected Bitmap doInBackground(Object... params) {            String source = (String) params[0];            mDrawable = (LevelListDrawable) params[1];            //特殊处理，进行来处理https协议进行来显示的图片            X509TrustManager xtm = new X509TrustManager() {                @Override                public void checkClientTrusted(X509Certificate[] chain, String authType) {                }                @Override                public void checkServerTrusted(X509Certificate[] chain, String authType) {                }                @Override                public X509Certificate[] getAcceptedIssuers() {                    X509Certificate[] x509Certificates = new X509Certificate[0];                    return x509Certificates;                }            };            SSLContext sslContext = null;            try {                sslContext = SSLContext.getInstance("SSL");                sslContext.init(null, new TrustManager[]{xtm}, new SecureRandom());            } catch (NoSuchAlgorithmException e) {                e.printStackTrace();            } catch (KeyManagementException e) {                e.printStackTrace();            }            HostnameVerifier DO_NOT_VERIFY = new HostnameVerifier() {                @Override                public boolean verify(String hostname, SSLSession session) {                    return true;                }            };            try {                URL url = new URL(source);                HttpsURLConnection httpsURLConnection= (HttpsURLConnection) url.openConnection();                httpsURLConnection.setHostnameVerifier(DO_NOT_VERIFY);                httpsURLConnection.setSSLSocketFactory(sslContext.getSocketFactory());                InputStream is = httpsURLConnection.getInputStream();                return BitmapFactory.decodeStream(is);            } catch (Exception e) {                e.printStackTrace();            }            return null;        }        /**         * 图片下载完成后执行         */        @Override        protected void onPostExecute(Bitmap bitmap) {            if (bitmap != null) {                try{                    BitmapDrawable d = new BitmapDrawable(bitmap);                    mDrawable.addLevel(1, 1, d);                    /**                     * 适配图片大小 <br/>                     * 默认大小：bitmap.getWidth(), bitmap.getHeight()<br/>                     * 适配屏幕：getDrawableAdapter                     */                    mDrawable = getDrawableAdapter(context, mDrawable,                            bitmap.getWidth(), bitmap.getHeight());                    // mDrawable.setBounds(0, 0, bitmap.getWidth(),                    // bitmap.getHeight());                    mDrawable.setLevel(1);                    /**                     * 图片下载完成之后重新赋值textView<br/>                     * mtvActNewsContent:我项目中使用的textView                     *                     */                    textView.invalidate();                    CharSequence t = textView.getText();                    textView.setText(t);                }catch (Exception e){                    Log.e("onPostExecute", "onPostExecute: "+e.toString() );                }            }        }        /**         * 加载网络图片,适配大小         *         * @param context         * @param drawable         * @param oldWidth         * @param oldHeight         * @return         * @author Ruffian         * @date 2016年1月15日         */        public LevelListDrawable getDrawableAdapter(Context context,                                                    LevelListDrawable drawable, int oldWidth, int oldHeight) {            LevelListDrawable newDrawable = drawable;            long newHeight = 0;// 未知数            newHeight = (widthPixels * oldHeight) / oldWidth;            // LogUtils.w("oldWidth:" + oldWidth + "oldHeight:" +            // oldHeight);            // LogUtils.w("newHeight:" + newHeight + "newWidth:" +            // newWidth);            newDrawable.setBounds(0, 0, widthPixels, (int) newHeight);            return newDrawable;        }    }}

进行使用:

 courseIntroduction.setText(Html.fromHtml(s,new HtmlImageGetter(mContext,courseIntroduction), null));

为了让大家看见，我在下面贴一下效果图：