Java 不要在旋转时加载相关的横向/纵向布局
我的Android应用程序有一个非常令人不安的问题。我正在使用Java 不要在旋转时加载相关的横向/纵向布局,java,android,eclipse,user-interface,android-fragments,Java,Android,Eclipse,User Interface,Android Fragments,我的Android应用程序有一个非常令人不安的问题。我正在使用片段。每个片段包含一个单独的XML文件,用于纵向UI和横向UI 如果我从片段“InputFragment”移动到片段“OutputFragment”,并且如果我现在旋转设备,片段将更改为“InputFragment”!!这意味着,应用程序将返回到旋转时的前一个片段!但是,这不是应该发生的事情。如果我在纵向旋转设备,那么它应该调用相同片段的横向UI,反之亦然 下面是代码。我只显示代码的结构,因为所有其他都是变量声明和赋值等 InputF
片段
。每个片段包含一个单独的XML文件,用于纵向UI和横向UI
如果我从片段“InputFragment
”移动到片段“OutputFragment
”,并且如果我现在旋转设备,片段将更改为“InputFragment
”!!这意味着,应用程序将返回到旋转时的前一个片段!但是,这不是应该发生的事情。如果我在纵向旋转设备,那么它应该调用相同片段的横向UI,反之亦然
下面是代码。我只显示代码的结构,因为所有其他都是变量声明和赋值等
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)
{
}
}
}
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();
}
}
}
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;
}
}
OutputFragment.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)
{
}
}
}
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();
}
}
}
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;
}
}
MainActivity.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)
{
}
}
}
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();
}
}
}
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;
}
}
清单文件
<?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>
经过数小时的搜索,我找到了一个解决方案来解决这个问题。也就是说,将代码android:configChanges=“keyboardHidden | screenLayout | orientation | screenSize”
添加到清单文件中
现在,片段在旋转时不会移动到上一个片段,但是,它也不会加载其他布局!这意味着,如果我将手机从纵向旋转到横向,则不会加载“横向”用户界面,反之亦然!它只是试图调整自己以适应视图,这是不好的,因为在没有加载其他相关UI的情况下,图像和所有内容都会显示不好。这里发生了什么事 旋转后,将重新创建活动,并调用其
onCreate()
方法。
您要做的是检查活动是否第一次启动,然后用InputFragment
替换片段。在Activity first creation上,savedInstanceState为空,因此可以执行以下操作:
if(savedInstanceState == null) {
// replace fragment
}
编辑:
这是活动中的onCreate()
的外观:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
if(savedInstanceState == null) {
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();
}
}
现在,方向更改活动不会替换您的片段,您不需要在清单中设置任何属性您的布局不会更改,因为您使用了
android:configChanges
attr,这基本上是为了防止布局在旋转时重新创建而不是在片段中,在活动的onCreate
方法中。将碎片事务代码放在那里。请记住删除清单中的configChanges
attr。这似乎有效,但它包含一个问题。“public void processFinish(字符串输出)”方法开始运行。这是一种回调方法。InputFragment处理网络操作,执行此操作时,它将移动到OutputFragment以显示结果。输出片段在“processFinish()”中显示一个进度对话框,一旦操作完成,它将关闭对话框并显示结果,这意味着图像。在这里,它只显示进度对话框(这是不需要的),什么也不做。