是ActivityGroup 的BUG？是对机制理解不深刻？还是逻辑错误？还是。。。不知道了？

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喷到这里。

 

这一两天碰到一个问题，是一个关于ActivityGroup 的问题，因为项目需要，必须把一个自定义的PreferenceActivity 的界面嵌套在ActivityGroup 里面，可是当我嵌套在里面的时候发现了一个问题。就是PreferenceActivity 的元素不会自动更新UI，这是比较致命的，不知道为什么会出现这个问题。

查了很久，首先我怀疑是我的自定义preference写的有问题，改了一遍，然后再运行还是一样。

单独运行该 preferenceActivity 试了一下，界面可以按照自己的需求更新UI，那就是说不是我这个自定义的preference 的逻辑问题？这点还不敢确定。

那么我怀疑是 ActivityGroup 不允许底下Activity 元素的UI自动更新，那么新建一个普通的Activity 来试试，在这普通的Activity 里面只有一个按钮同样是点击之后弹出对话框然后改变按钮的字，试了一下，。更新成功。。。耶？那么说ActivityGroup 还是允许底下Activity UI 元素更新的？那么问题出在哪呢？

我又再调试跟踪了代码，确定有执行settext的代码？那是不是说preferenceActivity 和ActivityGroup有冲突？不知道所然，下面贴出我碰到问题的全部代码，由于在公司有加密软件无法将DEMO提供给大家，大家可以根据代码新建一个工程，一起来研究这个问题。

 

自定义的PreferenceScreenExt 源码：

 

package asai.cn.seekbardemo;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.preference.Preference;
import android.preference.PreferenceGroup;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public   class  PreferenceScreenExt extends PreferenceGroup implements
        OnItemClickListener, DialogInterface.OnDismissListener {

     private  Dialog dialog;
     private  TextView title, summary;
     private  SharedPreferences share;
     private  RelativeLayout area;
     private  ListView listView;
    List < Preference >  list;

     private  List < HashMap < String, String >>  listStr;
     private  CharSequence[] mEntries;
     private  String mValue;

     private  SimpleAdapter simple;

     public  PreferenceScreenExt(Context context, AttributeSet attrs) {
         this (context, attrs, android.R.attr.preferenceScreenStyle);
         //  TODO Auto-generated constructor stub
    }

     public  PreferenceScreenExt(Context context, AttributeSet attrs,  int  defStyle) {
        super(context, attrs, android.R.attr.preferenceScreenStyle);
         //  TODO Auto-generated constructor stub
         int  resouceId  =  attrs.getAttributeResourceValue( null ,  " Entries " ,  0 );
         if  (resouceId  >   0 ) {
            mEntries  =  getContext().getResources().getTextArray(resouceId);
        }
    }

    @Override
     protected  View onCreateView(ViewGroup parent) {
         //  TODO Auto-generated method stu
        View view  =  LayoutInflater.from(getContext()).inflate(
                R.layout.preference_screen,  null );
        area  =  (RelativeLayout) view.findViewById(R.id.area);
        share  =  getPreferenceManager().getSharedPreferences();
        title  =  (TextView) view.findViewById(R.id.title);
        summary  =  (TextView) view.findViewById(R.id.summary);
        title.setText(getTitle());
        summary.setText(share.getString(getKey(), getSummary()  ==   null   ?   ""
                : getSummary().toString()));
        area.setOnClickListener( new  OnClickListener() {

            @Override
             public   void  onClick(View v) {
                 //  TODO Auto-generated method stub
                showDialog();
            }
        });
         return  view;
    }

     public   void  bindView(ListView listview) {
         int  length  =  mEntries.length;
         int  i  =   0 ;
        listStr  =   new  ArrayList < HashMap < String, String >> ();
         for  (i  =   0 ; i  <  length; i ++ ) {
            HashMap < String, String >  map  =   new  HashMap < String, String > ();
            map.put( " keyname " , mEntries[i].toString());
            listStr.add(map);
        }
        simple  =   new  SimpleAdapter(getContext(), listStr, R.layout.dialog_view,
                 new  String[] {  " keyname "  },  new   int [] { R.id.text });
        listview.setAdapter(simple);
        listview.setOnItemClickListener( this );
    }

     public   void  showDialog() {
        listView  =   new  ListView(getContext());
        bindView(listView);
        dialog  =   new  Dialog(getContext(), android.R.style.Theme_NoTitleBar);
        dialog.setContentView(listView);
        dialog.setOnDismissListener( this );
        dialog.show();
    }

    @Override
     public   void  onItemClick(AdapterView <?>  parent, View view,  int  position,
             long  id) {
         //  TODO Auto-generated method stub
        mValue  =  listStr. get (position). get ( " keyname " ).toString();
        SharedPreferences.Editor editor  =  getEditor();
        editor.putString(getKey(), mValue);
        callChangeListener(mValue);
        PreferenceScreenExt. this
                .setOnPreferenceChangeListener( new  OnPreferenceChangeListener() {

                    @Override
                     public  boolean onPreferenceChange(Preference preference,
                            Object newValue) {
                         //  TODO Auto-generated method stub
                         if  (temp  !=   null ) {
                            temp.onPreferenceChange(PreferenceScreenExt. this ,
                                    newValue);
                        }
                         return   true ;
                    }
                });
        editor.commit();
        dialog.dismiss();
    }

    @Override
     public   void  onDismiss(DialogInterface dialog) {
         //  TODO Auto-generated method stub
    }

     private  OnPreferenceChangeListener temp;

     public   interface  OnPreferenceChangeListener {
         public  boolean onPreferenceChange(Preference preference, Object newValue);
    }

     public   void  setOnPreferenceChangeListener(
            OnPreferenceChangeListener preference) {
         this .temp  =  preference;
    }

     public   void  setValue(String value) {
        summary.setText(value);
        persistString(value);
    }

}

 

对应的XML布局文件：

 

dialog_view.xml

<? xml version="1.0" encoding="utf-8" ?>
< LinearLayout  android:layout_width ="fill_parent"
    xmlns:android ="http://schemas.android.com/apk/res/android"
    android:orientation ="vertical"  android:gravity ="center"
    android:layout_height ="fill_parent"   >


     < TextView  android:id ="@+id/text"  android:layout_marginLeft ="20dp"
        android:textAppearance ="?android:attr/textAppearanceLarge"
        android:textSize ="35sp"  android:layout_width ="wrap_content"
        android:layout_height ="wrap_content" >
     </ TextView >


</ LinearLayout >  

 

 

 

preference_screen.xml

<? xml version="1.0" encoding="utf-8" ?>
< RelativeLayout  android:id ="@+id/area"  android:gravity ="center_vertical"
    android:layout_marginTop ="5px"  android:clickable ="true"
    xmlns:android ="http://schemas.android.com/apk/res/android"
     android:layout_width ="fill_parent"
    android:layout_height ="wrap_content" >

     < TextView  android:id ="@+id/title"  android:layout_marginLeft ="20dp"
        android:textAppearance ="?android:attr/textAppearanceLarge"
        android:textSize ="35sp"  android:layout_width ="wrap_content"
        android:layout_height ="wrap_content" >
     </ TextView >
     < TextView  android:id ="@+id/summary"
        android:layout_marginRight ="20dp"  android:textSize ="35sp"
        android:textAppearance ="?android:attr/textAppearanceLarge"
        android:layout_alignParentRight ="true"  android:layout_width ="wrap_content"
        android:layout_height ="wrap_content" >
     </ TextView >
</ RelativeLayout >

 

 

XML文件夹下的XML文件：

 

preference.xml

<? xml version="1.0" encoding="utf-8" ?>
< PreferenceScreen  xmlns:android ="http://schemas.android.com/apk/res/android" >

     < asai.cn.seekbardemo.PreferenceScreenExt
         Entries ="@array/country"  android:title ="收音区域"  android:summary ="美国"
        android:persistent ="true"  android:key ="eeg" >
     </ asai.cn.seekbardemo.PreferenceScreenExt >
</ PreferenceScreen >

 

 

main.java 对应代码

 

package asai.cn.seekbardemo;

import android.app.ActivityGroup;
import android.app.LocalActivityManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

public   class  main extends ActivityGroup implements OnClickListener {

     private  LocalActivityManager lm;
     private  LinearLayout layout;
     private  Button btn, btn2;

    @Override
     protected   void  onCreate(Bundle savedInstanceState) {
         //  TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.group);

        lm  =  getLocalActivityManager();
        btn  =  (Button) findViewById(R.id.Button01);
        btn2  =  (Button) findViewById(R.id.Button02);

        btn.setOnClickListener( this );
        btn2.setOnClickListener( this );
        layout  =  (LinearLayout) findViewById(R.id.layout);
        Intent intent  =   new  Intent( this , seekBarDemo. class );
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Window w  =  lm.startActivity( " test " , intent);
        View v  =  w.getDecorView();
        layout.removeAllViews();
        layout.addView(v);
    }

    @Override
     public   void  onClick(View v) {
         //  TODO Auto-generated method stub
         switch  (v.getId()) {
         case  R.id.Button01:
            Intent intent  =   new  Intent( this , seekBarDemo. class );
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            Window w  =  lm.startActivity( " test " , intent);
            View view  =  w.getDecorView();
            layout.removeAllViews();
            layout.addView(view);
             break ;
         case  R.id.Button02:
            Intent  in   =   new  Intent( this , test. class );
             in .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            Window win  =  lm.startActivity( " ww " ,  in );
            View vw  =  win.getDecorView();
            layout.removeAllViews();
            layout.addView(vw);
             break ;
         default :
             break ;
        }
    }
}

 

 

对应的XML布局文件：

 

group.xml

<? xml version="1.0" encoding="utf-8" ?>
< LinearLayout  android:orientation ="vertical"
    android:layout_width ="fill_parent"  android:layout_height ="fill_parent"
    xmlns:android ="http://schemas.android.com/apk/res/android" >

     < LinearLayout  android:layout_width ="fill_parent"
        android:gravity ="center_horizontal"  android:layout_height ="wrap_content" >
         < Button  android:text ="preference界面"  android:id ="@+id/Button01"
            android:layout_width ="wrap_content"  android:layout_height ="wrap_content" ></ Button >
         < Button  android:text ="普通"  android:id ="@+id/Button02"
            android:layout_width ="wrap_content"  android:layout_height ="wrap_content" ></ Button >
     </ LinearLayout >
     < LinearLayout  android:id ="@+id/layout"
        android:layout_width ="fill_parent"  android:layout_height ="wrap_content" ></ LinearLayout >
</ LinearLayout >     

 

 

 

PreferenceActivity 界面代码 SeekBarDemo.java：

 

package asai.cn.seekbardemo;

import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.Preference.OnPreferenceChangeListener;
import android.widget.TextView;

public   class  seekBarDemo extends PreferenceActivity {
     private  Preference eeg;

     /* * Called when the activity is first created.  */
    @Override
     public   void  onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preference);

        final PreferenceScreenExt pre  =  (PreferenceScreenExt) findPreference( " eeg " );
        pre.setOnPreferenceChangeListener( new  OnPreferenceChangeListener() {

            @Override
             public  boolean onPreferenceChange(Preference preference,
                    Object newValue) {
                 //  TODO Auto-generated method stub
                pre.setValue(String.valueOf(newValue));
                 return   true ;
            }
        });
    }

}

 

 

普通的Activity 界面代码test.java：

 

package asai.cn.seekbardemo;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public   class  test extends Activity {
    @Override
     protected   void  onCreate(Bundle savedInstanceState) {
         //  TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);

        final Button btn  =  (Button) findViewById(R.id.Button01);
        btn.setOnClickListener( new  OnClickListener() {

            @Override
             public   void  onClick(View v) {
                 //  TODO Auto-generated method stub
                 new  AlertDialog.Builder(test. this ).setMessage( " 修改 " ).setTitle(
                         " 提示 " ).setPositiveButton(android.R. string .ok,
                         new  DialogInterface.OnClickListener() {

                            @Override
                             public   void  onClick(DialogInterface dialog,
                                     int  which) {
                                 //  TODO Auto-generated method stub
                                btn.setText( " 修改后的按钮 " );
                            }
                        }).show();
            }
        });
    }
}

 

 

配置文件：

 

AndroidManifest.xml

<? xml version="1.0" encoding="utf-8" ?>
< manifest  xmlns:android ="http://schemas.android.com/apk/res/android"
    package ="asai.cn.seekbardemo"  android:versionCode ="1"
    android:versionName ="1.0" >
     < application  android:icon ="@drawable/icon"  android:label ="@string/app_name" >
         < activity  android:name =".main"  android:label ="@string/app_name" >
             < intent-filter >
                 < action  android:name ="android.intent.action.MAIN"   />
                 < category  android:name ="android.intent.category.LAUNCHER"   />
             </ intent-filter >
         </ activity >
         < activity  android:name =".test"  android:label ="@string/app_name" >
             < intent-filter >

                 < category  android:name ="android.intent.category.LAUNCHER"   />
             </ intent-filter >
         </ activity >
         < activity  android:name =".seekBarDemo"  android:label ="@string/app_name" >
             < intent-filter >
             
                 < category  android:name ="android.intent.category.LAUNCHER"   />
             </ intent-filter >
         </ activity >

     </ application >
     < uses-sdk  android:minSdkVersion ="7"   />

</ manifest >  

 

 

希望就此问题和大家探讨一下。