Html.from()加载网络图片

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TextView加载带有图片的Html时，会显示一个蓝色的小框框，而不会显示图片
这里写图片描述

想要显示图片，就需要调用fromHtml(String source, Html.ImageGetter imageGetter, Html.TagHandler tagHandler)方法。

重写ImageGetter
先判断drawable是否已经下载，没有下载就开启线程下载

Html.ImageGetter imageGetter = new Html.ImageGetter() {        @Override        public Drawable getDrawable(String s) {            if (pic != null) {                Log.d("TAG", "显示");                return pic;            }            else {                Log.d("TAG", "加载"+s);                getPic(s);            }            return null;        }    };

下载图片，并且等比例放大

 private void getPic(final String s) {        new Thread(new Runnable() {            @Override            public void run() {                try {                    final Drawable drawable = Drawable.createFromStream(new URL(s).openStream(), "");                    activity. runOnUiThread(new Runnable() {                        @Override                        public void run() {                            if (drawable != null) {                                WindowManager wm = (WindowManager) activity.getSystemService(Context.WINDOW_SERVICE);                                DisplayMetrics outMetrics = new DisplayMetrics();                                wm.getDefaultDisplay().getMetrics(outMetrics);                                float picW = drawable.getIntrinsicWidth();                                float picH = drawable.getIntrinsicHeight();                                int width = outMetrics.widthPixels;                                drawable.setBounds(0,0,width,(int)((picH/picW)*width));                                pic = drawable;                                if (Build.VERSION.SDK_INT >= 24)                                    text.setText(Html.fromHtml(resource,Html.FROM_HTML_MODE_COMPACT,imageGetter,null));                                else                                    text.setText(Html.fromHtml(resource,imageGetter,null));                            }                        }                    });                } catch (IOException e) {                    e.printStackTrace();                }            }        }).start();    }

这里写图片描述

最后附上自己用的工具栏

import android.app.Activity;import android.content.Context;import android.graphics.drawable.Drawable;import android.os.Build;import android.text.Html;import android.util.DisplayMetrics;import android.util.Log;import android.view.WindowManager;import android.widget.TextView;import java.io.IOException;import java.net.URL;/** * Created by CKZ on 2017/8/8. */public class HtmlUtils {    private static HtmlUtils instance;    private Activity activity;    private TextView text;    private Drawable pic;    private String resource;    private HtmlUtils(Activity activity,TextView text){        this.activity =activity;        this.text = text;    }    public static HtmlUtils getInstance(Activity activity,TextView text){        if (instance == null){            instance = new HtmlUtils(activity,text);        }        return instance;    }    public void setHtmlWithPic(String resource){        this.resource = resource;        if (Build.VERSION.SDK_INT >= 24)            text.setText(Html.fromHtml(resource,Html.FROM_HTML_MODE_COMPACT,imageGetter,null));        else            text.setText(Html.fromHtml(resource,imageGetter,null));    }    Html.ImageGetter imageGetter = new Html.ImageGetter() {        @Override        public Drawable getDrawable(String s) {            if (pic != null) {                Log.d("TAG", "显示");                return pic;            }            else {                Log.d("TAG", "加载"+s);                getPic(s);            }            return null;        }    };    /**     * 加载网络图片     * @param s     */    private void getPic(final String s) {        new Thread(new Runnable() {            @Override            public void run() {                try {                    final Drawable drawable = Drawable.createFromStream(new URL(s).openStream(), "");                    activity. runOnUiThread(new Runnable() {                        @Override                        public void run() {                            if (drawable != null) {                                WindowManager wm = (WindowManager) activity.getSystemService(Context.WINDOW_SERVICE);                                DisplayMetrics outMetrics = new DisplayMetrics();                                wm.getDefaultDisplay().getMetrics(outMetrics);                                float picW = drawable.getIntrinsicWidth();                                float picH = drawable.getIntrinsicHeight();                                int width = outMetrics.widthPixels;                                drawable.setBounds(0,0,width,(int)((picH/picW)*width));                                pic = drawable;                                if (Build.VERSION.SDK_INT >= 24)                                    text.setText(Html.fromHtml(resource,Html.FROM_HTML_MODE_COMPACT,imageGetter,null));                                else                                    text.setText(Html.fromHtml(resource,imageGetter,null));                            }                        }                    });                } catch (IOException e) {                    e.printStackTrace();                }            }        }).start();    }}

然后再Activity中调用
HtmlUtils.getInstance(this,texthtnl).setHtmlWithPic(resource); 即可。

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