TextView加載帶有圖片的Html時，會顯示一個藍色的小框框，而不會顯示圖片

想要顯示圖片，就需要調用fromHtml(String source, Html.ImageGetter imageGetter, Html.TagHandler tagHandler)方法。

重寫ImageGetter
先判斷drawable是否已經下載，沒有下載就開啟線程下載

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

下載圖片，并且等比例放大

private void getPic(final String s) {new Thread(new Runnable() {@Overridepublic void run() {try {final Drawable drawable = Drawable.createFromStream(new URL(s).openStream(), "");activity. runOnUiThread(new Runnable() {@Overridepublic 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));elsetext.setText(Html.fromHtml(resource,imageGetter,null));}}});} catch (IOException e) {e.printStackTrace();}}}).start();}

最后附上自己用的工具欄

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));elsetext.setText(Html.fromHtml(resource,imageGetter,null));}Html.ImageGetter imageGetter = new Html.ImageGetter() {@Overridepublic Drawable getDrawable(String s) {if (pic != null) {Log.d("TAG", "顯示");return pic;}else {Log.d("TAG", "加載"+s);getPic(s);}return null;}};/*** 加載網絡圖片* @param s*/private void getPic(final String s) {new Thread(new Runnable() {@Overridepublic void run() {try {final Drawable drawable = Drawable.createFromStream(new URL(s).openStream(), "");activity. runOnUiThread(new Runnable() {@Overridepublic 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));elsetext.setText(Html.fromHtml(resource,imageGetter,null));}}});} catch (IOException e) {e.printStackTrace();}}}).start();} }

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

總結

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