问题描述

所以我使用 ImageGetter 来显示来自 JSON 博客文章的图像.我在日志中获得了正确的来源，但 URL 在到达 setBounds 时会发生变化.有什么想法吗?

So Im using ImageGetter to display the images from JSON blog posts. Im getting the correct source in the log but the URL changes when it reaches setBounds. Any ideas?

代码:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_blog_view);

    Intent intent = getIntent();
    Uri blogUri = intent.getData();
    mPost = blogUri.toString();
    mUrl = getIntent().getStringExtra("mUrl");

    TextView textView = (TextView) findViewById(R.id.scrollView1);
    textView.setText(Html.fromHtml(mPost, imgGetter, null));
}

private ImageGetter imgGetter = new ImageGetter(){
    @Override
    public Drawable getDrawable(String source){
         Drawable drawable = Drawable.createFromPath(source);
        try {
            drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
        }catch (NullPointerException e){
            logException(e);
        }
        return drawable;
    }
};

尝试前的来源"是

http://www.domain.com/images_blog/feature.png

但在 catch 中，错误是:

but in the catch the error is:

无法解码流:

java.io.FileNotFoundException: /http:/www.domain.com/images_blog/feature.png : open failed: ENOENT (No such file or directory)

推荐答案

最简单的解决方案是:

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);
            }
        }
    }
}

在图像下载后重新布局 TextView 有一种不太优雅的方法:

there is one not quite elegant way to re-layout a TextView after image downloading:

// 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);

如果有人知道更好的解决方案，请告诉我

if anybody knows better solution please let me know

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