你能帮我弄清楚如何为此实现线程,这样它就不会在等待服务器响应时卡住吗? 我已经尝试了 5 个小时左右,我只是找不到在线程中使用它的方法,然后返回它以使用 tv.setText(); 设置文本;
package zee.rhs.dk;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class AndroidClientActivity extends Activity {
private String ip = "90.184.254.246";
private int port = 8081;
private String line;
private TextView tv;
private Button btn;
private Socket socket;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView) findViewById(R.id.tv);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
BufferedReader in = null;
PrintWriter out = null;
try {
socket = new Socket(ip, port);
out = new PrintWriter(socket.getOutputStream(), true);
out.println("update");
in = new BufferedReader(new InputStreamReader(socket
.getInputStream()));
while ((line = in.readLine()) == null) {
}
tv.setText(line);
} catch (UnknownHostException e) {
Toast.makeText(AndroidClientActivity.this,
"Can't reach ip: " + ip, Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (IOException e) {
Toast.makeText(AndroidClientActivity.this,
"Accept failed at port: " + port, Toast.LENGTH_LONG)
.show();
e.printStackTrace();
} finally {
out.close();
}
}
});
}
}
最佳答案
AsyncTask是你要找的。从帮助页面:
private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
int count = urls.length;
long totalSize = 0;
for (int i = 0; i < count; i++) {
totalSize += Downloader.downloadFile(urls[i]);
publishProgress((int) ((i / (float) count) * 100));
}
return totalSize;
}
protected void onProgressUpdate(Integer... progress) {
setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
showDialog("Downloaded " + result + " bytes");
}
}
请记住,doInBackground
在单独的线程中运行,onPostExecute
在 doInBackground
完成后在 UI 线程中运行。
关于java - 我的应用程序卡住,如何在其中实现线程?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10507171/