我试图解决我的问题,所以我改变了这么多的代码。我甚至改变帖子的标题。 我可以成功地在首选项ui中更改imageview背景的颜色。但在离开碎片并再次启动后,用户界面无法像以前一样更新。如何在android中首选更改imageview背景颜色?
首先,我使用sherlockactionbar。有3个选项卡。当按下第三栏时,加载一个片段,包括按钮。当按下其中一个按钮时,将加载另一首选项片段。
下面的代码示出了如何调用偏好片段当按下按钮之一: SettingsMenuFragment.java
public class SettingsMenuFragment extends SherlockFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { Button ICSbutton= (Button) view.findViewById(R.id.CallSearchSettingsButton);
ICSbutton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
clearFragmentStack();
SettingsIncomingSearchFragment removeSISF = (SettingsIncomingSearchFragment) getActivity().getSupportFragmentManager().findFragmentByTag("SISF");
if(removeSISF != null)
{
getActivity().getSupportFragmentManager().beginTransaction().remove(removeSISF).commit() ;
getActivity().getSupportFragmentManager().executePendingTransactions();
}
SettingsIncomingSearchFragment Prefrag = new SettingsIncomingSearchFragment();
FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(android.R.id.content, Prefrag ,"SISF");
transaction.addToBackStack(null);
transaction.commit();
getActivity().getSupportFragmentManager().executePendingTransactions();
}
});}}
和下面的代码显示preferencefragment:
public class SettingsIncomingSearchFragment extends PreferenceListFragment implements SharedPreferences.OnSharedPreferenceChangeListener,PreferenceListFragment.OnPreferenceAttachedListener {
Context ctx ;
public static final String SHARED_PREFS_NAME = "settings";
LinearLayout mainlayout ;
LinearLayout sublayout ;
View view ;
Preference myPref ;
ImageView img ;
SharedPreferences sp ;
@Override
public void onCreate(Bundle icicle) {
ctx = getActivity() ;
super.onCreate(icicle);
addPreferencesFromResource(R.xml.pref_incomingsearchsettings);
myPref = (Preference) findPreference("incomingsearchbackgroundcolor");
setColor() ;
myPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
public boolean onPreferenceClick(Preference preference) {
HSVColorPickerDialog cpd = new HSVColorPickerDialog(ctx, 0xFF4488CC, new OnColorSelectedListener() {
@Override
public void colorSelected(Integer color)
{
sp.edit().putString("incomingsearchbackgroundcolor", String.valueOf(color)).commit();
}
});
cpd.setTitle("Pick a color");
cpd.show();
return true ;
}
});
}
private void setColor() {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater)
getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.rectangle_layout, null);
mainlayout = (LinearLayout)view.findViewById(R.id.rectangle_main_layout_ll);
sublayout = (LinearLayout)mainlayout.findViewById(R.id.rectangle_layout_ll);
sp = ctx.getSharedPreferences(SHARED_PREFS_NAME, ctx.MODE_PRIVATE);
String defValue = null ;
defValue = sp.getString("incomingsearchbackgroundcolor", null);
img = (ImageView)sublayout.findViewById(R.id.iv_priority);
img.setBackgroundColor(Integer.parseInt(defValue));
}
@Override
public void onPreferenceAttached(PreferenceScreen root, int xmlId) {
// TODO Auto-generated method stub
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
String key) {
// TODO Auto-generated method stub
if(key.equals("incomingsearchbackgroundcolor"))
{
sp = ctx.getSharedPreferences(SHARED_PREFS_NAME, ctx.MODE_PRIVATE);
String defValue = null ;
defValue = sp.getString("incomingsearchbackgroundcolor", null);
Log.d("Debug", defValue);
int iColor = Integer.parseInt(defValue);
img.setBackgroundColor(iColor);
img.invalidate();
if(this.isAdded())
{
getActivity().getSupportFragmentManager().beginTransaction().detach(this).commit() ;
getActivity().getSupportFragmentManager().executePendingTransactions();
getActivity().getSupportFragmentManager().beginTransaction().attach(this).commit();
getActivity().getSupportFragmentManager().executePendingTransactions();
}
}
}
@Override
public void onResume()
{
super.onResume();
sp.registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onPause() {
super.onPause();
sp.unregisterOnSharedPreferenceChangeListener(this);
}
}
这是首选xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory android:summary = "Options" android:title = "OPTIONS" android:key="options">
<CheckBoxPreference android:key="IncomingCallSearch" android:summary="On/Off" android:title="Enable Incoming Call Search" android:defaultValue="true"/>
</PreferenceCategory>
<PreferenceCategory android:summary = "Screen Settings" android:title = "Screen settings" android:key="ScreenSettings" >
<ListPreference
android:entries="@array/screenLocOptions"
android:entryValues="@array/screenLocValues"
android:key="incomingcallsearch_screenlocation"
android:title="Location"
android:defaultValue="Top"/>
<Preference
android:defaultValue="0xFF000000"
android:key="incomingsearchbackgroundcolor"
android:title="Background Color"
android:layout="@layout/rectangle_layout" />
</PreferenceCategory>
,这是rectangle_layout XML
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:id="@+id/rectangle_main_layout_ll">
<TextView
android:id="@+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="16sp"
android:text="Background color"
android:layout_weight= "0.9"/>
<LinearLayout
android:layout_width="50dp"
android:layout_height="50dp"
android:orientation="vertical"
android:layout_weight= "0.1"
android:id="@+id/rectangle_layout_ll">
<ImageView
android:id="@+id/iv_priority"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
/>
</LinearLayout>
我写这篇文章的先前版本,上面的代码成功运行在第一个片段加载,ImageView的背景颜色在偏好ui中更新。我尝试逐步写入失败状态:
1。我从操作栏中选择第三个小节,并加载一个包含按钮的片段。 2。我按下加载首选项片段的按钮(可以看到上面的代码)
3。在这个偏好片段中,有一个偏好,包括textview和imageview(你可以看到上面的细节)
4。当我点击这个首选项时,一个颜色选择器跑了(你可以看到上面的细节)
5。我从颜色选择器中选择颜色并将其保存为共享首选项(您可以看到上述详细信息)
6。 onsharedpreferencechanged事件触发,我改变了imageview的背景颜色(你可以看到上面的细节)成功。
7。我通过从操作栏选择另一个选项卡或使用后备按钮离开片段。
8。我在第3栏中按相同的按钮启动相同的片段。
9。我再次使用颜色选择器,并触发onsharedpreferencechanged事件。
10。我可以在调试中看到真正的颜色代码来自sharedpreference,并将其设置为imageview背景颜色,并运行以下代码:
getActivity()。getSupportFragmentManager()。beginTransaction()。detach(this).commit( ); getActivity()。getSupportFragmentManager()。executePendingTransactions(); getActivity()。getSupportFragmentManager()。beginTransaction()。attach(this).commit(); getActivity()。getSupportFragmentManager()。executePendingTransactions();
11。但是此时不会更新偏好。在Imageview中看到旧的颜色或黑色。
非常感谢您
正如我在这个问题(http://stackoverflow.com/questions/21360959/imageview-setbackgroundcolor-is-not-working-in-android)写的,该解决方案只适用于android 4.1.2。 – user3184643