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我的Android應用程序出現非常令人不安的麻煩。我正在使用Fragments。每個片段都包含一個用於Portrait UI和Landscape UI的獨立XML文件。請勿在旋轉時加載相關的橫向/縱向佈局
如果我從片段'InputFragment'移動到片段'OutputFragment'，並且如果我現在旋轉設備，則片段變爲'InputFragment'！這意味着，應用程序正在旋轉時返回到前一個片段！但是，這不是應該發生的。如果我將設備旋轉到縱向位置，那麼它應該調用相同片段的橫向UI，反之亦然。
以下是驗證碼。我只顯示代碼的結構，因爲所有其它的變量聲明和分配值等
InputFragment.java
public class InputFragment extends Fragment {
//Declaring variables. CODE REMOVED
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
//Intializing instance variables. CODE REMOVED
view = inflater.inflate(R.layout.input, container,false);
restoreStates(savedInstanceState);
return view;
}
//This method will save the instances
@Override
public void onSaveInstanceState(Bundle savedInstanceStateBundle)
{
super.onSaveInstanceState(savedInstanceStateBundle);
try{
}
catch(NullPointerException e)
{
}
}
//This method will restore the instances
@Override
public void onActivityCreated(Bundle savedInstanceStateBundle)
{
super.onActivityCreated(savedInstanceStateBundle);
if(savedInstanceStateBundle!=null)
{
}
}
//Action Listener for the Submit Bar
private class SubmitButtonAction implements OnClickListener
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
//Put the JSON. Calling to the JSON handling class. CODE REMOVED
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Fragment frag = new OutputFragment();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_container, frag);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
}
}
private void restoreStates(Bundle savedInstanceStateBundle)
{
if(savedInstanceStateBundle!=null)
{
}
}
}
OutputFragment.Java
public class OutputFragment extends Fragment implements AsyncResponse{
//Delclaring variables. CODE REMOVED
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
//Intializing instance variables. CODE REMOVED
view = inflater.inflate(R.layout.output, container,false);
return view;
}
//ActionListener for the manual back button
private class BackButtonAction implements OnClickListener
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
FragmentManager fm = getFragmentManager();
fm.popBackStackImmediate();
}
}
@Override
public void processFinish(String output) {
// TODO Auto-generated method stub
Log.d("OUTPUT_FRAGMENT", output);
try {
progressDialog.dismiss();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
MainActivity.java
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.Window;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
Fragment frag = new InputFragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.fragment_container, frag);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
清單文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xxx.xxx"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/xxx_logo"
android:label="@string/xxx"
android:theme="@style/AppTheme">
<activity
android:name="com.xxx.xxx.MainActivity"
android:configChanges="keyboardHidden|screenLayout|orientation|screenSize"
android:label="@string/xxx" >
</activity>
<activity
android:name="com.xxx.xxx.SplashScreen"
android:configChanges="keyboardHidden|screenLayout|orientation|screenSize"
android:label="@string/xxx" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
搜尋小時後，我發現了一個解決方案，以阻止這個問題。也就是說，將代碼android:configChanges="keyboardHidden|screenLayout|orientation|screenSize"添加到Manifest文件中。
現在，片段不會移動到旋轉中的上一個片段，但它不會加載其他佈局！這意味着，如果將手機從縱向旋轉到橫向，則不會加載「橫向」UI，反之亦然！它只是試圖調整自己的視圖，這是不好的，因爲圖像和一切都顯示不好，沒有加載其他相關的用戶界面。這裏發生了什麼？
你的佈局d因爲你使用了'android：configChanges'屬性，所以不會改變，因爲它基本上是用來防止佈局在旋轉時重新創建的 – Hellboy