Question

我的应用程序由一个由两个片段组成的活动组成。第一个片段通过XML添加，第二个片段根据第一个片段的输入动态添加。该应用程序在模拟器上完美运行。但是，当在真实设备（三星Galaxy标签）上进行测试时，应用程序只需在更改设备方向时退出（不会崩溃且没有任何错误）。我正在使用android 4.0。我经常搜索这个问题并尝试了本网站和其他人提供的各种解决方案，但问题仍然存在。我还想补充一点，我的应用程序版本不使用片段在两个方向都可以正常工作。

主布局文件（activity_main.xml）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" 
android:orientation="vertical" >

<fragment 
android:name="androiapps.autoqos.FirstFragment"
android:id="@+id/fragment"
android:layout_weight="2"
android:layout_width="fill_parent"
android:layout_height="0dp" 
/>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_height="0dp"
android:orientation="vertical"
android:id="@+id/frameLayout" >

</FrameLayout>
</LinearLayout>

MainActivity.java

public class MainActivity extends FragmentActivity implements OnInputReceivedListener, MessageSendListener{
//variable declarations 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
public void onConfirm(Bundle bundle) {
    // TODO Auto-generated method stub
    if(bundle!=null){
        //int PT = bundle.getInt("PT");
        System.out.println("Got:"+bundle.getString("ip")+bundle.getString("port")+bundle.getString("tcpip")
                +bundle.getString("tcpport")+bundle.getInt("PT",0));
        udpHost=bundle.getString("ip");
        udpPort=bundle.getString("port");
        tcpHost=bundle.getString("tcpip");
        tcpPort=bundle.getString("tcpport");
        pType=bundle.getInt("pType",0);
        FragmentManager fragmentManager = getSupportFragmentManager();
        MessageFragment fragment = new MessageFragment();
        fragment.setArguments(bundle);
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.replace(R.id.frameLayout, fragment);
        transaction.commit();
    }
}

@Override
public void send(Bundle bundle) {
    // TODO Auto-generated method stub
    if(bundle==null)
        return;

    msg = bundle.getString("msg");
    delay = bundle.getInt("delay",0);
    System.out.println("Got: "+msg+delay);          
    startTransmission();
}
void startTransmission(){
    System.out.println("\nTrying to send data");
    sendFilter = new IntentFilter(UdpResponseReceiver.ACTION_RESP1);
    sendFilter.addCategory(Intent.CATEGORY_DEFAULT);
    receiver1 = new UdpResponseReceiver(); 
    receiveFilter = new IntentFilter(UdpHandlerReceiver.ACTION_RESP2);
    receiveFilter.addCategory(Intent.CATEGORY_DEFAULT);
    receiver2 = new UdpHandlerReceiver();
    registerReceiver(receiver1, sendFilter);
    registerReceiver(receiver2, receiveFilter);
    udpServiceIntent = new Intent(MainActivity.this,UdpSendService.class);
    udpReceiveIntent = new Intent(MainActivity.this,UdpReceiveService.class);
    udpServiceIntent.putExtra("host",udpHost);
    udpServiceIntent.putExtra("port", udpPort);
    udpServiceIntent.putExtra("msg",msg);
    udpServiceIntent.putExtra("delay",delay);
    udpServiceIntent.putExtra("pType",pType);
    startService(udpServiceIntent);
    udpReceiveIntent.putExtra("tcpHost", tcpHost);
    udpReceiveIntent.putExtra("tcpPort", tcpPort);
    startService(udpReceiveIntent);
}
public class UdpResponseReceiver extends BroadcastReceiver {
    public static final String ACTION_RESP1 = "com.example.udpmessageclient.intent.action.MESSAGE_PROCESSED";
    @Override
    public void onReceive(Context context, Intent intent) {

        // Update UI, new "message" processed by SimpleIntentService
        System.out.println(intent.getStringExtra(UdpSendService.PARAM_OUT_MSG));

    }      
}   
public class UdpHandlerReceiver extends BroadcastReceiver {
    public static final String ACTION_RESP2 = "com.example.udpmessageclient.intent.action.MESSAGE_RECEIVED";
    @Override
    public void onReceive(Context context, Intent intent) {

        // Update UI, new "message" processed by SimpleIntentService
        System.out.println("Received message from server: "+intent.getStringExtra(UdpReceiveService.OUT_MSG));

    }    
}

@Override
public void stop() {
    // TODO Auto-generated method stub
    endTransmission();
    Button btn = (Button)findViewById(R.id.btn_confirm);
    btn.setEnabled(true);

}
void endTransmission(){
    UdpSendService.send=false;
    if(receiver1!=null && receiver2!=null){
        unregisterReceiver(receiver1);
        unregisterReceiver(receiver2);
        receiver1=null;
        receiver2=null;
    }
    //while(stopService(udpReceiveIntent)!=true);
    if(udpReceiveIntent!=null)
        stopService(udpReceiveIntent);
    System.out.println("\nreceive service stopped");
    //while(stopService(udpServiceIntent)!=true);
    if(udpServiceIntent!=null)
        stopService(udpServiceIntent);
    System.out.println("\nsend service stopped");
    return;
}
@Override
public void onBackPressed() {
    if(UdpSendService.send)
        stop();
    finish();

}
@Override
public void onStop() {
    super.onStop();
    stop();
    finish();
}

    }

FirstFragment.java

public class FirstFragment extends Fragment{
//variable declarations
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View contentView = inflater.inflate(R.layout.activity_message_form, null);
    contentView.setDrawingCacheEnabled(false);
    text1 = (EditText) contentView.findViewById(R.id.ip);
    text2 = (EditText) contentView.findViewById(R.id.port);
    text3 = (EditText) contentView.findViewById(R.id.tcpip);
    text4 = (EditText) contentView.findViewById(R.id.tcpport);
    if(onSaveInstance!=null){
        text1.setText(onSaveInstance.getString("ip"));
        text2.setText(onSaveInstance.getString("port"));
        text3.setText(onSaveInstance.getString("tcpip"));
        text4.setText(onSaveInstance.getString("tcpport"));
    }
    button= (Button) contentView.findViewById(R.id.btn_confirm);
    rb1 = (RadioButton) contentView.findViewById(R.id.rbtn_1);
    rb2 = (RadioButton) contentView.findViewById(R.id.rbtn_2);
    rb3 = (RadioButton) contentView.findViewById(R.id.rbtn_3);
    rb4 = (RadioButton) contentView.findViewById(R.id.rbtn_4);
    confirmButtonListener = new OnClickListener(){
        public void onClick(View view){
            button.setEnabled(false);
            if (rb1.isChecked())
                PT = 0;
            else if (rb2.isChecked())
                PT = 1;
            else if (rb3.isChecked())
                PT = 2;
            else if (rb4.isChecked())
                PT = 3;
            else
                PT = 0;
            ip = text1.getText().toString().trim();
            port = text2.getText().toString().trim();
            tcpip=text3.getText().toString().trim();
            tcpport=text4.getText().toString().trim();
            if(ip=="" || port=="" || tcpip == "" || tcpport ==""){
                Toast.makeText(getActivity(), "Please fill in all the fields", Toast.LENGTH_SHORT).show();
            }
            else{
                Bundle b = new Bundle();
                b.putString("ip",ip);
                b.putString("port", port);
                b.putString("tcpip",tcpip);
                b.putString("tcpport", tcpport);
                b.putInt("pType", PT);

                if ( listener != null ){
                    System.out.println("Bundle:"+ip+port+tcpip+tcpport+PT);
                    listener.onConfirm(b);
                }
            }
            }
    };
    return contentView;
}
@Override
public void onStart(){
super.onStart();
button.setOnClickListener(confirmButtonListener);
}
@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
super.onAttach(activity);
try {
    listener = (OnInputReceivedListener)activity;
}catch (ClassCastException e) {
    Toast.makeText( activity, "Activity must implement this interface.", Toast.LENGTH_SHORT).show();
}
}
public interface OnInputReceivedListener{
    public void onConfirm(Bundle bundle);
}
@Override
public void onPause(){
    super.onPause();
    onSaveInstance = new Bundle();
    onSaveInstance.putString("udpHost", ip);
    onSaveInstance.putString("udpPort", port);
    onSaveInstance.putString("tcpHost", tcpip);
    onSaveInstance.putString("tcpPort", tcpport);

}
@Override
public void onResume(){
    super.onResume();
    if(onSaveInstance!=null){
        text1.setText(onSaveInstance.getString("ip"));
        text2.setText(onSaveInstance.getString("port"));
        text3.setText(onSaveInstance.getString("tcpip"));
        text4.setText(onSaveInstance.getString("tcpport"));
    }
}
}

MessageFragment.java

public class MessageFragment extends Fragment{
//variable declarations
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View contentView = inflater.inflate(R.layout.activity_message, null);
    contentView.setDrawingCacheEnabled(false);
    msgText = (EditText) contentView.findViewById(R.id.msg);
    sendBtn = (Button) contentView.findViewById(R.id.btn_send);
    stopBtn = (Button) contentView.findViewById(R.id.btn_stop);
    if(onSaveInstance!=null){
        msgText.setText(onSaveInstance.getString("msg"));
        delayField.setText(onSaveInstance.getInt("delay", 0));
    }
    b = getArguments();
    System.out.println("PT="+b.getInt("pType",0));
    if(b!=null){
        int pType = b.getInt("pType");
        if(pType==1 || pType== 3){
            delayField = (EditText) contentView.findViewById(R.id.delay);
            tvDelay = (TextView) contentView.findViewById(R.id.tvDelay);
            tvDelay.setVisibility(View.VISIBLE);
            delayField.setVisibility(View.VISIBLE);
        }
    }
    sendButtonListener=new OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            sendBtn.setEnabled(false);
            Bundle b = new Bundle();
            msg=msgText.getText().toString();
            delay=Integer.parseInt(delayField.getText().toString());
            b.putString("msg", msg);
            if(delayField!=null)
                b.putInt("delay",delay);
            if(mListener!=null)
                mListener.send(b);
        }
    };
    stopButtonListener = new OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            sendBtn.setEnabled(true);
            mListener.stop();
        }
    };
    return contentView;
}
@Override
public void onStart(){
    super.onStart();
    sendBtn.setOnClickListener(sendButtonListener);
    stopBtn.setOnClickListener(stopButtonListener);
}
@Override
public void onAttach(Activity activity) {
    // TODO Auto-generated method stub
    super.onAttach(activity);
    try {
        mListener = (MessageSendListener)activity;
    }catch (ClassCastException e) {
        Toast.makeText( activity, "Activity must implement this interface.", Toast.LENGTH_SHORT).show();
    }
}
public interface MessageSendListener{
    public void send(Bundle bundle);
    public void stop();
}
@Override
public void onPause(){
    super.onPause();
    onSaveInstance = new Bundle();
    onSaveInstance.putString("msg", msg);
    onSaveInstance.putInt("delay", delay);
}
@Override
public void onResume(){
    super.onResume();
    if(onSaveInstance!=null){
        msgText.setText(onSaveInstance.getString("msg"));
        delayField.setText(onSaveInstance.getInt("delay", 0));
    }
}
}

Answer 1

您是否使用此代码

android:configChanges="keyboard|keyboardHidden|orientation"

有关详细信息，请查看此link

Answer 2

public void onStop() {
    super.onStop();
    stop();
    finish();

为什么要完成（）？您的应用程序正在执行您编写的操作。当方向改变时，调用onStop（）。然后，finish()您的活动。

当设备的方向改变时，带有片段的android活动退出

2 个答案: