我是 Android 的新手,希望有人能帮助我。 每当我使用 OnclickListener 执行 Asynctask 时,程序就会崩溃。如果我在不使用 onclicklistener 的情况下执行 Asynctask,测试程序工作正常。
public class MainActivity extends Activity {
TextView label;
Button start;
MyAsyncTask test;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
label = (TextView)findViewById(R.id.tvIndicator);
start = (Button)findViewById(R.id.btSend);
test = new MyAsyncTask();
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
test.execute();
}
});
}
public class MyAsyncTask extends AsyncTask{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("htt://****.php");//left out the address
@Override
protected Object doInBackground(Object... params) {
// TODO Auto-generated method stub
label.setText("Please Work");
String MyName = "testing";
String response = null;
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("emailAdd", MyName));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
ResponseHandler<String> responseHandler = new BasicResponseHandler();
response = httpclient.execute(httppost, responseHandler);
label.setText(response.length());
return response;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
最佳答案
您不能在不同于 UI Thread
本身的 Thread
中更新 UI 元素。您必须使用 Handler
或使用 runOnUiThread
例如
runOnUiThread(new Runnable() {
public void run() {
label.setText("Please Work");
}
});
关于android - 异步任务在 OnclickListener 中崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16438016/