java – Html.ImageGetter TextView

发布时间：2020-12-15 07:38:36 所属栏目：Java 来源：网络整理

导读：所以我使用 ImageGetter来显示 JSON博客文章中的图像.我在日志中获取了正确的源,但是当URL达到setBounds时URL会发生变化.有任何想法吗？码： protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.

所以我使用 ImageGetter来显示 JSON博客文章中的图像.我在日志中获取了正确的源,但是当URL达到setBounds时URL会发生变化.有任何想法吗？

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,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

但在捕获中错误是：

无法解码流：

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

解决方法

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,empty);
        d.setBounds(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,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);
            }
        }
    }
}

图像下载后有一种不太优雅的方式重新布局TextView：

// 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

（编辑：李大同）

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