为什么我的活动自动重启？ [英] Why is my activity restarting automatically?
问题描述
我在Android应用程序开发的初学者。最近，开始研制聊天应用。我实现了客户端服务器消息交换的基本功能。我面临着Android的活动就会自动重启的问题。正因为如此，创建视图一个新的实例，我不能看到列表视图中的消息。
I am beginner in android app development. Recently, started to develop a chat app. I achieved basic functionality of client server message exchange. I am facing an issue that android activity gets restarted automatically. Because of this, a new instances of views are created and am not able see the messages on list view.
从痕迹，我可以看到，活动停止，自动创建。因此，主要活动的新实例重新创建。
From the traces, I can see that activity is stopped and created automatically. Hence, a new instance of MAIN activity is created again.
12-21 14:47:50.744 1913-1913/? I/System.out﹕ **********MainActivity.onCreate()-->com.chat.client.MainActivity@1e611def
12-21 14:48:11.209 1913-1913/chat.com.android_client I/System.out﹕ ********onStop() app is killed!!!
12-21 14:48:11.216 1913-1913/chat.com.android_client I/System.out﹕ **********MainActivity.onCreate()-->com.chat.client.MainActivity@7ea43db
[ MainActivity.java ]
package com.chat.client;
import android.app.Activity;
import android.database.DataSetObserver;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AbsListView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import com.chat.client.config.ChatProtocolConstants;
import com.chat.client.config.ServerUriConstants;
import com.chat.client.connect.ChatServerListener;
import com.chat.client.connect.ChatWebSocketHandler;
import com.chat.client.connect.ConnectionManager;
import chat.com.android_client.R;
import de.tavendo.autobahn.WebSocketHandler;
public class MainActivity extends Activity {
private ChatArrayAdapter chatArrayAdapter;
private ListView listView;
private EditText chatEditText;
private Button buttonSend;
private boolean side = false;
private ConnectionManager connectionManager;
private final String from = "Ramu", to = "Omkar";
@Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println("**********MainActivity.onCreate()-->"+this);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonSend = (Button) findViewById(R.id.buttonSend);
listView = (ListView) findViewById(R.id.listView1);
chatArrayAdapter = new ChatArrayAdapter(getApplicationContext(), R.layout.activity_chat_singlemessage);
chatEditText = (EditText) findViewById(R.id.chatText);
chatEditText.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
ChatMessage chatMessage = new ChatMessage(false, chatEditText.getText().toString());
return sendChatMessage(chatMessage);
}
return false;
}
});
buttonSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ChatMessage chatMessage = new ChatMessage(false, chatEditText.getText().toString());
sendChatMessage(chatMessage);
}
});
listView.setTranscriptMode(AbsListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
listView.setAdapter(chatArrayAdapter);
chatArrayAdapter.registerDataSetObserver(new DataSetObserver() {
@Override
public void onChanged() {
super.onChanged();
listView.setSelection(chatArrayAdapter.getCount() - 1);
}
});
// Connect to chat server
connectToServer();
}
@Override
protected void onStop() {
super.onStop();
System.out.println("********onStop() app is killed!!!");
}
private boolean sendChatMessage(ChatMessage chatMessage) {
connectionManager.sendMessage(from + ChatProtocolConstants.DELIMITER + to + ChatProtocolConstants.DELIMITER + chatMessage.message);
return updateChatList(chatMessage);
}
private boolean updateChatList(ChatMessage chatMessage) {
chatArrayAdapter.add(chatMessage);
chatEditText.setText("");
return true;
}
private void connectToServer() {
connectionManager = ConnectionManager.getInstance();
WebSocketHandler chatWebSocketHandler = new ChatWebSocketHandler(from);
((ChatWebSocketHandler) chatWebSocketHandler).setWebSocketListener(new ChatServerListener() {
@Override
public void messageReceived(String message) {
ChatMessage chatMessage = new ChatMessage(true, message);
System.out.println("Received message from web socket handler: " + message);
updateChatList(chatMessage);
}
}
);
connectionManager.connect(ServerUriConstants.serverUri + ServerUriConstants.connectEndPoint, chatWebSocketHandler);
}
}
[ activity_main.xml中]
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="80dp"></ListView>
<RelativeLayout
android:id="@+id/form"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:orientation="vertical">
<EditText
android:id="@+id/chatText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/buttonSend"
android:ems="10"
android:inputType="textMultiLine" />
<Button
android:id="@+id/buttonSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/chatText"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:text="@string/button_send" />
</RelativeLayout>
我评论呼吁connectToServer（）来检查的行为却是相同的。所以没有造成connectToServer（）。
I commented call to connectToServer() to check the behaviour but it is the same. So there is no issue caused by connectToServer().
以下是我使用在Android Studio中来运行这个应用程序模拟器
由于活动的自动重启预计不会有什么可以在这里失踪。请建议。
Following is the emulator which I am using in android studio to run this app Since automatic restarting of an activity is NOT expected, what could be missing here. Please suggest.
推荐答案
是的，有采用的是Android 1.0的工作室和Ubuntu 14.04使用模拟器棒棒糖一个问题。
它被赋予以下错误：
Yes there is a problem with emulator for Lollipop in android studio 1.0 and Ubuntu 14.04. It was giving following error:
12-21 15:47:02.512 1900-1916/chat.com.android_client W/EGL_emulation﹕ eglSurfaceAttrib not implemented
12-21 15:47:02.512 1900-1916/chat.com.android_client W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa6da4140, error=EGL_SUCCESS
由于此的onCreate的（）是得到在这种情况下叫了两声。
Because of this onCreate() was getting called twice in this case.
我切换到奇巧模拟器，它现在是罚款。
I switched to KitKat emulator and it is fine now.
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