[英]Refresh MainActivity on returning from preference setting screen
我有“首選項”屏幕。 我想立即執行在偏好屏幕中更改為MainActivity的列表視圖的設置
Preference.xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="Sys apps">
<CheckBoxPreference
android:title="Sytem Apps"
android:key="system"
android:defaultValue="true"
android:summary="Click To View Only Installed Apps"
/>
</PreferenceCategory>
</PreferenceScreen>
MainActivity.class
public class MainActivity extends ListActivity {
PackageManager packageManager;
List<ApplicationInfo> applist;
Listadapter listadapter;
String packageName="";
boolean isUnInstallClicked;
int mPosition;
boolean installed;
ApplicationInfo info;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
packageManager = getPackageManager();
new LoadApplications().execute();
}
@Override
protected void onResume() {
super.onResume();
if(isUnInstallClicked && !appInstalledOrNot(packageName)){
applist.remove(listadapter.getItem(mPosition));
listadapter.notifyDataSetChanged();
}
}
private boolean appInstalledOrNot(String uri){
PackageManager pm=getPackageManager();
boolean app_installed;
try{
pm.getPackageInfo(uri,PackageManager.GET_ACTIVITIES);
app_installed=true;
}catch (PackageManager.NameNotFoundException e){
app_installed=false;
}
return app_installed;
}
private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
ArrayList<ApplicationInfo> applist = new ArrayList<>();
SharedPreferences preferences= PreferenceManager.getDefaultSharedPreferences(getBaseContext());
installed=preferences.getBoolean("system", true);
for (ApplicationInfo info : list) {
try {
if(installed==true) {
if ((info.flags & ApplicationInfo.FLAG_SYSTEM)!=0) {
applist.add(info);
listadapter.notifyDataSetChanged();
}
}
else if(installed==false){
if ((info.flags & ApplicationInfo.FLAG_SYSTEM)==0) {
applist.add(info);
listadapter.notifyDataSetChanged();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
return applist;
}
private class LoadApplications extends AsyncTask<Void, Void, Void> {
private ProgressDialog progress = null;
@Override
protected Void doInBackground(Void... params) {
applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listadapter = new Listadapter(MainActivity.this, R.layout.list_item, applist);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
setListAdapter(listadapter);
progress.dismiss();
super.onPostExecute(aVoid);
}
@Override
protected void onPreExecute() {
progress = ProgressDialog.show(MainActivity.this, null, "loading apps info,,,");
super.onPreExecute();
}
}
@Override
protected void onPause() {
super.onPause();
}
}
我希望當“ system == false”時,只要單擊並返回mainactivity,mainactivity的listview就會使用已安裝的應用程序進行更新。
在onStart()
而不是onCreate()
加載應用程序列表。 (如果您不喜歡這,還有其他選擇,但這可能是最簡單的選擇。)
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