同步显示有网络图片的List

更新方法啦

现在通过WebView来加载图片，由于WebView会自动从cache中读取已下载过的图片，所以可以有效的复用已有资源，而且不会增加额外的代码。

不过还是有一些小缺陷
1. 必须要在layout中设定图片要显示的大小
2. 有时会看到图片会缩小

以后有机会再改进吧。

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Picture;
import android.os.AsyncTask;
import android.util.AttributeSet;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebSettings.LayoutAlgorithm;
import android.webkit.WebView;
import android.webkit.WebView.PictureListener;
import android.webkit.WebViewClient;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;

public class LoadImageSync extends RelativeLayout {

	private WebView mWebView;
	private ProgressBar mLoading;
	private ImageView mImage;

	public LoadImageSync(Context context) {
		this(context, null);
	}

	public LoadImageSync(Context context, AttributeSet attrs) {
		super(context, attrs);

		setupComponent(context);
	}

	private void setupComponent(Context context) {

		LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
				LayoutParams.WRAP_CONTENT);
		params.addRule(RelativeLayout.CENTER_IN_PARENT);

		mLoading = new ProgressBar(context);
		mLoading.setLayoutParams(params);
		mLoading.setProgress(android.R.attr.progressBarStyleSmall);

		mImage = new ImageView(context);
		mImage.setLayoutParams(params);

		mWebView = new WebView(context);
		mWebView.setBackgroundColor(0);
		mWebView.setScrollBarStyle(0);
		mWebView.setLayoutParams(params);
		mWebView.setWebViewClient(new LoadImageWebViewClient());
		mWebView.setPictureListener(picListener);

		WebSettings webSettings = mWebView.getSettings();
		webSettings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);

		removeAllViews();
		addView(mLoading);
		addView(mWebView);
		addView(mImage);
	}

	public void setImageUrl(String url) {
		load(url);
	}

	private void load(String url) {

		new AsyncTask<String, Void, Void>() {

			@Override
			protected Void doInBackground(String... params) {

				String url = params[0];

				mWebView.loadDataWithBaseURL(null,
						getHtmlContent(url, mWebView), "text/html", "utf-8",
						null);

				return null;
			}

		}.execute(url);
	}

	private String getHtmlContent(String imageUrl, WebView view) {

		StringBuffer sb = new StringBuffer();

		sb.append("<center>");
		sb.append("<img width=\"100%\" src=\"" + imageUrl + "\" />");
		sb.append("</center>");

		return sb.toString();
	}

	private class LoadImageWebViewClient extends WebViewClient {

		@Override
		public void onReceivedError(WebView view, int errorCode,
				String description, String failingUrl) {

			mLoading.setVisibility(View.GONE);
		}

		@Override
		public void onPageStarted(WebView view, String url, Bitmap favicon) {
			mLoading.setVisibility(View.VISIBLE);
			mWebView.setVisibility(View.GONE);
			mImage.setVisibility(View.GONE);
		}

		@Override
		public void onPageFinished(WebView view, String url) {

			mWebView.setVisibility(View.VISIBLE);
			mWebView.setHorizontalScrollBarEnabled(false);
			mWebView.setVerticalScrollBarEnabled(false);

			mLoading.setVisibility(View.GONE);
		}
	}

	PictureListener picListener = new PictureListener() {

		public void onNewPicture(WebView view, Picture picture) {

			Picture pic = mWebView.capturePicture();

			int w = pic.getWidth();
			int h = pic.getHeight();

			Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
			final Canvas c = new Canvas(b);
			view.draw(c);

			mWebView.setVisibility(View.GONE);

			mImage.setImageBitmap(b);
			mImage.setVisibility(View.VISIBLE);
		}
	};
}

自己做了个类，用来同步显示网络图片。
放到List里，好像也能正常工作，截图如下


完整sourse一并共享，希望对大家有用。

评论

1 楼 edison_cool911 2010-09-15  

兄弟,jar包啊
帮发个
谢谢
QQ:21413244