我的应用程序包含一个由两个片段组成的活动。第一个片段通过 XML 添加，第二个片段根据来自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，在真实设备（三星 Galaxy 选项卡）上进行测试时，应用程序会在更改设备方向时退出（不会崩溃且没有任何错误）。我使用的是安卓 4.0。我搜索了很多这个问题，并尝试了这个网站和其他网站上给出的各种解决方案，但问题仍然存在。我还想补充一点，我的应用程序不使用片段的版本在两个方向上都可以正常工作。
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));
}
}
}