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[英]Is it possible to display inline images from html in an Android TextView?
[英]Modern way to download and caching inline images from html content inside TextView (Kotlin)
根據這個問題,我使用以下兩個類來下載里面的圖像(HTML內容<img標簽),但由於某些原因效率不高,首先有時它不是緩存所有圖像,其次static Picasso字段導致泄漏該應用程序,所以我正在尋找更好的方法並肯定支持高嶺土
畢加索緩存
public class PicassoCache {
// @SuppressLint("StaticFieldLeak")
private static Picasso picassoInstance = null;
private PicassoCache(Context context) {
Downloader downloader = new OkHttp3Downloader(context, Integer.MAX_VALUE);
Picasso.Builder builder = new Picasso.Builder(context);
builder.downloader(downloader);
picassoInstance = builder.build();
}
public static Picasso getPicassoInstance(Context context) {
if (picassoInstance == null) {
//noinspection InstantiationOfUtilityClass
new PicassoCache(context);
return picassoInstance;
}
return picassoInstance;
}
}
畢加索ImageGetter
public class PicassoImageGetter implements Html.ImageGetter {
private static final String TAG = "PicassoImageGetter";
private TextView textView = null;
Context mContext;
public PicassoImageGetter(TextView target, Context context) {
textView = target;
mContext = context;
}
public PicassoImageGetter() {
}
@Override
public Drawable getDrawable(String source) {
BitmapDrawablePlaceHolder drawable = new BitmapDrawablePlaceHolder();
// Picasso.get().load(source).into(drawable);
PicassoCache.getPicassoInstance(mContext)
.load(source)
.priority(Picasso.Priority.HIGH)
.error(R.drawable.no_image)
.into(drawable);
return drawable;
}
@SuppressWarnings("deprecation")
private class BitmapDrawablePlaceHolder extends BitmapDrawable implements com.squareup.picasso.Target {
protected Drawable drawable;
@Override
public void draw(final Canvas canvas) {
if (drawable != null) {
drawable.draw(canvas);
}
}
public void setDrawable(Drawable drawable) {
this.drawable = drawable;
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
drawable.setBounds(0, 0, width, height);
setBounds(0, 0, width, height);
if (textView != null) {
textView.setText(textView.getText());
}
}
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
setDrawable(new BitmapDrawable(mContext.getResources(), bitmap));
}
@Override
public void onBitmapFailed(Exception e, Drawable errorDrawable) {
setDrawable(errorDrawable);
Log.e(TAG, "onBitmapFailed: "+e.toString() );
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
}
}
我像這樣使用它
val imageGetter = PicassoImageGetter(binding.blogContent, this)
val html: Spannable = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
Html.fromHtml(content, Html.FROM_HTML_MODE_LEGACY, imageGetter, null) as Spannable
} else {
Html.fromHtml(content, imageGetter, null) as Spannable
}
binding.blogContent.text = html
結果
我發現這個庫html-textview sufficientlysecure.htmltextview.HtmlTextView
secure.htmltextview.HtmlTextView
依賴
在項目 Gradle 文件中:
repositories {
jcenter()
}
在應用程序 Gradle 文件中:
dependencies {
implementation 'org.sufficientlysecure:html-textview:3.9'
}
在 XML 文件中,將您的 textView 替換為:
<org.sufficientlysecure.htmltextview.HtmlTextView
android:id="@+id/allNewsBlockTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:textColor="#000"
android:textSize="18sp"
app:htmlToString="@{detailsViewModel.selectedText}" />
有一個問題項目已停止。 4.0 是最后一個版本,沒有更多更新/維護,我會一直使用它,直到找到更好的解決方案
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