Question

所以我在下面的屏幕截图中看到了导致Type IOExceptions的代码段。

http://southwestdesign.org.uk/Code.jpg

我被告知我需要将它包装在try-catch块中，用try catch包装每个invididual块可以消除错误，但强制关闭Android。有人可以指出我正确的方向吗？

@Override
    public void onStart() {
        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet("http://1.php");
        HttpResponse response = client.execute(request);
        BufferedReader rd = new BufferedReader
        (new InputStreamReader(response.getEntity().getContent()));
        TextView textView = (TextView) findViewById(R.id.TextView1);
        String line = "";
        while ((line = rd.readLine()) != null) {
            textView.append(line);
        }
    }

谢谢你们。

Answer 1

你似乎在UI线程上做了网络IO，这是一个坏主意。因此，自从Android 2.3以来，系统“抓住”了这个并杀死了这个过程。

你应该把

 HttpResponse response = client.execute(request);

进入后台线程，例如使用AsyncTask。

Answer 2

try {

   //do something here
   //call method

}catch (IOException ioe){

// do something else
// log ioe

}

Answer 3

它应该是这样的：

@Override
    public void onStart() {

   try {
    HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet("http://1.php");
    HttpResponse response = client.execute(request);
    BufferedReader rd = new BufferedReader
    (new InputStreamReader(response.getEntity().getContent()));
    TextView textView = (TextView) findViewById(R.id.TextView1);
    String line = "";
    while ((line = rd.readLine()) != null) {
        textView.append(line);
    }

    }catch (IOException ex){
    }
}

更优选地使用AsyncTask在单独的线程上完成此操作。

Try-Catch声明麻烦

3 个答案: