总体思路如下：
在 TextView 中显示图片，可以使用Html.fromHtml(source, imageGetter, tagHandler)通过自定义imageGetter来异步加载图片，最后完成图文混排。
1、自定义imageGetter
public class UrlImageGetter implements ImageGetter {
@Overridepublic Drawable getDrawable(String source) {
return null;
}
}
继承ImageGetter实现里面的getDrawable方法。
在getDrawable中的source就是 img标签里src的值也就是图片的路径。
我们使用universal-image-loader.jar来异步加载这些图片
ImageLoader.getInstance().loadImage(source, new SimpleImageLoadingListener() {
@Overridepublic void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
}
});
2、因为图片是异步加载的，所以我们要先建立一个BitmapDrawable，当没有异步加载的时候用来getDrawable的返回
public class UrlDrawable extends BitmapDrawable {
protected Bitmap bitmap;
@Override
public void draw(Canvas canvas) {
// override the draw to facilitate refresh function later
if (bitmap != null) {
canvas.drawBitmap(bitmap, 0, 0, getPaint());
}
}
}
在异步加载成功设置监听，成功的时候，我们把BitmapDrawable的bitmap赋上我们异步得到的Bitmap对象在重新绘制，就可以显示出图片,由于图片可能没有固定的尺寸，为了美观我们同意把图片的宽度设置成和手机屏幕的宽度一致
具体代码如下：
ImageLoader.getInstance().loadImage(source, new SimpleImageLoadingListener() {
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
// 计算缩放比例
float scaleWidth = ((float) width)/loadedImage.getWidth();
// 取得想要缩放的matrix参数
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleWidth);
loadedImage = Bitmap.createBitmap(loadedImage, 0, 0, loadedImage.getWidth(), loadedImage.getHeight(), matrix, true);
urlDrawable.bitmap = loadedImage;
urlDrawable.setBounds(0, 0, loadedImage.getWidth(), loadedImage.getHeight());
container.invalidate();
container.setText(container.getText()); // 解决图文重叠
}
});
效果图如下:
效果图
最后发上代码
HtmlTextView.java
public class HtmlTextView extends TextView {
public static final String TAG = "HtmlTextView";
public static final boolean DEBUG = false;
public HtmlTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public HtmlTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public HtmlTextView(Context context) {
super(context);
}
/**
* @param is
* @return
*/
static private String convertStreamToString(InputStream is) {
java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
return s.hasNext() ? s.next() : "";
}
/**
* Parses String containing HTML to Android's Spannable format and displays
* it in this TextView.
*
* @param html String containing HTML, for example: "<b>Hello world!</b>"
*/
public void setHtmlFromString(String html, boolean useLocalDrawables) {
Html.ImageGetter imgGetter;
if (useLocalDrawables) {
imgGetter = new LocalImageGetter(getContext());
} else {
imgGetter = new UrlImageGetter(this, getContext());
}
// this uses Android's Html class for basic parsing, and HtmlTagHandler
setText(Html.fromHtml(html, imgGetter, new HtmlTagHandler()));
// make links work
setMovementMethod(LinkMovementMethod.getInstance());
text.setTextColor(getResources().getColor(android.R.color.secondary_text_dark_nodisable));
}
}
UrlImageGetter.java
public class UrlImageGetter implements ImageGetter {
Context c;
TextView container;
int width;
/**
*
* @param t
* @param c
*/
public UrlImageGetter(TextView t, Context c) {
this.c = c;
this.container = t;
width = c.getResources().getDisplayMetrics().widthPixels;
}
@Override
public Drawable getDrawable(String source) {
final UrlDrawable urlDrawable = new UrlDrawable();
ImageLoader.getInstance().loadImage(source,
new SimpleImageLoadingListener() {
@Override
public void onLoadingComplete(String imageUri, View view,
Bitmap loadedImage) {
// ??????
float scaleWidth = ((float) width) / loadedImage.getWidth();
// ???????matrix??
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleWidth);
loadedImage = Bitmap.createBitmap(loadedImage, 0, 0,
loadedImage.getWidth(), loadedImage.getHeight(),
matrix, true);
urlDrawable.bitmap = loadedImage;
urlDrawable.setBounds(0, 0, loadedImage.getWidth(),
loadedImage.getHeight());
container.invalidate();
container.setText(container.getText()); // ??????
}
});
return urlDrawable;
}
@SuppressWarnings("deprecation")
public class UrlDrawable extends BitmapDrawable {
protected Bitmap bitmap;
@Override
public void draw(Canvas canvas) {
// override the draw to facilitate refresh function later
if (bitmap != null) {
canvas.drawBitmap(bitmap, 0, 0, getPaint());
}
}
}
}
最后的设置文本
String html = "下面是图片了 " +"src='http://www.qqpk.cn/Article/UploadFiles/201411/20141116135722282.jpg'/>" +
"这也是图片" +"src='http://h.hiphotos.baidu.com/image/pic/item/d000baa1cd11728b2027e428cafcc3cec3fd2cb5.jpg'/>" +
"还有一张"+ "src='http://img.61gequ.com/allimg/2011-4/201142614314278502.jpg' />";
private HtmlTextView main;
@Overrideprotected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
main = (HtmlTextView) this.findViewById(R.id.main_text);
main.setHtmlFromString(html,false);
}
请在scr 前补上<img
简书markdown会把img标签转成图片，🈶️知道的望告知怎么破
如有什么不对或者不规范的地方请留言或私信我，非常感谢
传送门：
1、Android 图文混排（一） TextView实现图文显示
2、Android 图文混排（二） EditText实现图文显示
3、Android 图文混排（三）TextView图片点击
