从网页获取文本到字符串
我是Android的新手,我想将整个文本从网页转换为字符串。我发现了很多类似的问题,但是正如我所说的,我是Android的新手,我不知道如何在我的应用程序中使用它们。我遇到了错误。我只有一种方法设法使其起作用,它使用WebView和JavaScript,并且运行缓慢。有人可以告诉我其他方法或加快WebView的速度,因为我根本不使用它来查看内容。顺便说一句,我添加了以下代码来加速WebView
webView.getSettings().setJavaScriptEnabled(true); webView.getSettings().setBlockNetworkImage(true);
webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
webView.getSettings().setPluginsEnabled(false);
webView.getSettings().setSupportMultipleWindows(false);
webView.getSettings().setSupportZoom(false);
webView.getSettings().setSavePassword(false);
webView.setVerticalScrollBarEnabled(false);
webView.setHorizontalScrollBarEnabled(false);
webView.getSettings().setAppCacheEnabled(false);
webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
并且,如果您知道其他比使用WebView更好,更快的解决方案,请给我提供主要活动的全部源代码,或者解释一下我应该在哪里编写它,以便不会出错。
回答:
用这个:
public class ReadWebpageAsyncTask extends Activity { private TextView textView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textView = (TextView) findViewById(R.id.TextView01);
}
private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String response = "";
for (String url : urls) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse execute = client.execute(httpGet);
InputStream content = execute.getEntity().getContent();
BufferedReader buffer = new BufferedReader(
new InputStreamReader(content));
String s = "";
while ((s = buffer.readLine()) != null) {
response += s;
}
} catch (Exception e) {
e.printStackTrace();
}
}
return response;
}
@Override
protected void onPostExecute(String result) {
textView.setText(Html.fromHtml(result));
}
}
public void readWebpage(View view) {
DownloadWebPageTask task = new DownloadWebPageTask();
task.execute(new String[] { "http://www.google.com" });
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/readWebpage" android:onClick="readWebpage" android:text="Load Webpage"></Button>
<TextView android:id="@+id/TextView01" android:layout_width="match_parent" android:layout_height="match_parent" android:text="Example Text"></TextView>
</LinearLayout>
以上是 从网页获取文本到字符串 的全部内容, 来源链接: utcz.com/qa/405150.html