最も簡単な解決策は次のとおりです。
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import org.pskink.soom.R;
import android.app.Activity;
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.os.Bundle;
import android.text.Html;
import android.text.Html.ImageGetter;
import android.text.Spanned;
import android.util.Log;
import android.widget.TextView;
public class TestImageGetter extends Activity implements ImageGetter {
private final static String TAG = "TestImageGetter";
private TextView mTv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_image_getter);
String source = "this is a test of <b>ImageGetter</b> it contains " +
"two images: <br/>" +
"<img src=\"http://developer.android.com/assets/images/dac_logo.png\"><br/>and<br/>" +
"<img src=\"http://developer.android.com/assets/images/icon_search.png\">";
Spanned spanned = Html.fromHtml(source, this, null);
mTv = (TextView) findViewById(R.id.text);
mTv.setText(spanned);
}
@Override
public Drawable getDrawable(String source) {
LevelListDrawable d = new LevelListDrawable();
Drawable empty = getResources().getDrawable(R.drawable.ic_launcher);
d.addLevel(0, 0, empty);
d.setBounds(0, 0, empty.getIntrinsicWidth(), empty.getIntrinsicHeight());
new LoadImage().execute(source, d);
return d;
}
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];
Log.d(TAG, "doInBackground " + source);
try {
InputStream is = new URL(source).openStream();
return BitmapFactory.decodeStream(is);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Bitmap bitmap) {
Log.d(TAG, "onPostExecute drawable " + mDrawable);
Log.d(TAG, "onPostExecute bitmap " + bitmap);
if (bitmap != null) {
BitmapDrawable d = new BitmapDrawable(bitmap);
mDrawable.addLevel(1, 1, d);
mDrawable.setBounds(0, 0, bitmap.getWidth(), bitmap.getHeight());
mDrawable.setLevel(1);
// i don't know yet a better way to refresh TextView
// mTv.invalidate() doesn't work as expected
CharSequence t = mTv.getText();
mTv.setText(t);
}
}
}
}
画像のダウンロード後に TextView を再レイアウトする、あまり洗練されていない方法が 1 つあります。
// i don't know yet a better way to refresh TextView
// mTv.invalidate() doesn't work as expected
CharSequence t = mTv.getText();
mTv.setText(t);
誰かがより良い解決策を知っているなら、私に知らせてください