java - Listview致命的な例外：doInBackground内から呼び出す場合のAsyncTask＃1

Question

クライアント/サーバーを介して簡単なチャットを行っています。サーバーにメッセージを送信すると、ListViewバブルが完全に表示されます。しかし、サーバーから送信し、クライアントがそれを受信すると、addItems（）を実行しようとし、シャットダウンします。私はすべてを試しました。UIをAsynctaskから変更できないためですが、Android / Javaを初めて使用するため、何をすればよいかわかりません。PLEASEEEEを助けてください!!!!!

***MY LOG CAT** 01-08 18:32:41.023: E/AndroidRuntime(1242): FATAL EXCEPTION: AsyncTask #1
01-08 18:32:41.023: E/AndroidRuntime(1242): java.lang.RuntimeException: An error occured while executing doInBackground()
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.lang.Thread.run(Thread.java:856)
01-08 18:32:41.023: E/AndroidRuntime(1242): Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4609)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:835)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.view.View.requestLayout(View.java:15129)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.view.View.requestLayout(View.java:15129)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.view.View.requestLayout(View.java:15129)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.view.View.requestLayout(View.java:15129)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:292)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.view.View.requestLayout(View.java:15129)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.widget.AbsListView.requestLayout(AbsListView.java:1932)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.widget.AdapterView$AdapterDataSetObserver.onChanged(AdapterView.java:813)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.widget.AbsListView$AdapterDataSetObserver.onChanged(AbsListView.java:6051)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:37)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.widget.BaseAdapter.notifyDataSetChanged(BaseAdapter.java:50)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.widget.ArrayAdapter.notifyDataSetChanged(ArrayAdapter.java:286)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.widget.ArrayAdapter.add(ArrayAdapter.java:182)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at com.i911.emergency.response.DiscussArrayAdapter.add(DiscussArrayAdapter.java:26)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at com.i911.emergency.response.HelloBubblesActivity.addItems(HelloBubblesActivity.java:148)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at com.i911.emergency.response.HelloBubblesActivity.access$0(HelloBubblesActivity.java:147)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at com.i911.emergency.response.HelloBubblesActivity$TcpClientTask.doInBackground(HelloBubblesActivity.java:116)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at com.i911.emergency.response.HelloBubblesActivity$TcpClientTask.doInBackground(HelloBubblesActivity.java:1)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-08 18:32:41.023: E/AndroidRuntime(1242):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
01-08 18:32:41.023: E/AndroidRuntime(1242):     ... 5 more

これが私のコードです：

  package com.ChatWithMe;

  import java.io.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.OutputStreamWriter;
        import java.net.Socket;
  import java.net.UnknownHostException;
  import com.ChatWithMe.OneComment;
  import android.app.Activity;
  import android.os.AsyncTask;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.KeyEvent;
  import android.view.View;
  import android.view.View.OnKeyListener;
  import android.widget.EditText;
  import android.widget.ListView;
  import android.widget.TextView;

  public class HelloBubblesActivity extends Activity {
private com.ChatWithMe.DiscussArrayAdapter adapter;
private ListView lv;
private EditText editText1;
public Socket s;
public BufferedWriter out;
public BufferedReader in;
public TextView i911Log;
public EditText DataToSend;



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_discuss);
    lv = (ListView) findViewById(R.id.listView1);
    adapter = new DiscussArrayAdapter(getApplicationContext(), R.layout.listitem_discuss);
    lv.setAdapter(adapter);
    new TcpClientTask().execute();

    editText1 = (EditText) findViewById(R.id.editText1);
    editText1.setOnKeyListener(new OnKeyListener() {
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            // If the event is a key-down event on the "enter" button
            if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
                // Perform action on key press
                adapter.add(new OneComment(false, "User: " + editText1.getText().toString()));
                adapter.add(new OneComment(true, "User: " + editText1.getText().toString()));
                try {
                out.write("TXT:" + editText1.getText().toString());
                out.flush();
                } catch (UnknownHostException e) {
                     e.printStackTrace();
                     adapter.add(new OneComment(false, "Error Sending: " + editText1.getText().toString()));
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    adapter.add(new OneComment(false, "Error Sending: " + editText1.getText().toString()));
                    Log.i("TcpClient", "Button Clicked, but IOException Occured");
                }

                editText1.setText("");
                return true;
            }
            return false;
        }
    });

}

class TcpClientTask extends AsyncTask<Void, Void, Void> {
    private static final int TCP_SERVER_PORT = 1234;
    private boolean error = false;
    Boolean SocketStarted = false;
    private BufferedReader in;
    protected Void doInBackground(Void... arg0) {
        try {
            Socket s = new Socket("10.0.2.2", TCP_SERVER_PORT);
            //10.0.2.2
                in = new BufferedReader(new InputStreamReader(s.getInputStream()));
                out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));

            //send output msg
            String outMsg = "VER:Android,ID:1038263,SND:1,VDO:1,GPS:1,";
            out.write(outMsg);
            out.flush();
            String outMsg2 = com.ChatWithMe.MainActivity.GPSTracker.toString();
            out.write(outMsg2);
            out.flush();
            Log.i("TcpClient", "sent: " + outMsg);

            String WhatsIN = in.readLine();
            while(WhatsIN!=null){
            String inMsg = in.readLine() + System.getProperty("line.separator");
            Log.i("TcpClient", "received: " + inMsg);


            String inMsg3 = inMsg.substring(1,inMsg.length() - 1);
            Log.i("Info", "info: " + inMsg3);

            if (inMsg3.equals("GPSX")) {
                String GPSTracking = com.ChatWithMe.MainActivity.GPSTracker.toString();
                Log.i("GPSX", "Sent:" + GPSTracking.toString());
                out.write(GPSTracking);
                out.flush();
            }

            // Check Commands
            String CmdCheck = inMsg3.substring(0,4);
            if (CmdCheck.equals("TXT:")) {
           String SpitItOut = inMsg3.substring(4, inMsg3.length() - 1); 
           Log.i("SpitItOut", "Msg:" + SpitItOut.toString());

          //ERROR IS HERE
           addItems();
          //ERROR IS HERE   
            }

            } 

        } catch (UnknownHostException e) {
            error = true;
            e.printStackTrace();
        } catch (IOException e) {
            error = true;
            e.printStackTrace();
        } 

        return null;
    }

    protected void onPostExecute() {
        if(error) {
            // Something bad happened

        }
        else {
            // Success

        }
    }


}

private void addItems() {
    adapter.add(new OneComment(true, "Hello bubbles!"));
}

}

score 6 · Accepted Answer

に移動addItems()しonPostExecute()ます。バックグラウンドスレッドに関連するUIは変更できません。

score 2 · Accepted Answer

ここで非同期タスクについて読んでください。基本onPostExecute()的に、UIスレッドで実行されるメソッドがあり、そこから結果を渡しdoInBackground()、UIまたはメインスレッドで実行する必要があるすべてのことを変更する必要があります。したがって、addItems()アダプタをバックグラウンドスレッドから変更しようとしているため、メソッドはエラーを生成します。中に移動するとonPostExecute()、問題が解決するはずです。

java - Listview致命的な例外：doInBackground内から呼び出す場合のAsyncTask＃1

2 に答える 2

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