Comment obtenir la valeur de préférence partagée de baseadaptor à l'activité

Question

Sélection de plusieurs éléments de la vue de liste personnalisée et passage à une autre vue de liste . Lorsque je ferme l'application, ces éléments sélectionnés deviennent propres.

J'ai utilisé la préférence partagée, je ne pouvais pas en mesure d'obtenir les données> MainActivity

MainActivity.java

public class MainActivity extends Activity { 
private Button bt_inst_app; 
GridView gridView, gv_shortcut; 
List<AppList> installedApps; 
List<AppList> res = new ArrayList<AppList>(); 
private String appName, appPackageName; 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main_layout); 
    gv_shortcut = (GridView) findViewById(R.id.gv_shortcut); 
    bt_inst_app = (Button) findViewById(R.id.bt_inst_app); 
    bt_inst_app.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      AlertDialog.Builder quick_links_alert = new AlertDialog.Builder(MainActivity.this); 
      quick_links_alert.setTitle("Edit Quick Links"); 
      LinearLayout quick_links_layout = new LinearLayout(MainActivity.this); 
      quick_links_layout.setOrientation(LinearLayout.VERTICAL); 
      LinearLayout.LayoutParams quick_links_layoutparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); 
      quick_links_layoutparams.setMargins(20, 0, 30, 0); 
      gridView = new GridView(MainActivity.this); 
      installedApps = getInstalledApps(); 
      final GridViewAdapter gridViewAdapter = new GridViewAdapter(MainActivity.this, installedApps); 
      gridView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 
      gridView.setAdapter(gridViewAdapter); 
      gridView.setNumColumns(5); 
      quick_links_alert.setView(gridView); 
      quick_links_alert.setPositiveButton("OK", new DialogInterface.OnClickListener() { 
       public void onClick(DialogInterface dialog, int whichButton) { 
        final List<AppList> mArrayProducts = gridViewAdapter.getCheckedItems(); 
        final QuickLinksGridViewAdaptor selected_apps = new QuickLinksGridViewAdaptor(MainActivity.this, mArrayProducts); 
        gv_shortcut.setAdapter(selected_apps); 
        gv_shortcut.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
         @Override 
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
          String s = mArrayProducts.get(position).getPackageName(); 
          Intent PackageManagerIntent = getPackageManager().getLaunchIntentForPackage(s);//Here some time getting NULL 
          startActivity(PackageManagerIntent); 
         } 
        }); 
       } 
      }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 
       public void onClick(DialogInterface dialog, int whichButton) { 
       } 
      }); 
      quick_links_alert.show(); 

     } 

     private List<AppList> getInstalledApps() { 
      List<PackageInfo> packs = getPackageManager().getInstalledPackages(0); 
      for (int i = 0; i < packs.size(); i++) { 
       PackageInfo p = packs.get(i); 
       //if ((isSystemPackage(p) == false)) { 
       if (((p.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) != true) { 
        appName = p.applicationInfo.loadLabel(getPackageManager()).toString(); 
        Drawable icon = p.applicationInfo.loadIcon(getPackageManager()); 
        appPackageName = p.applicationInfo.packageName; 
        res.add(new AppList(icon, appName, appPackageName)); 
       } 
      } 
      return res; 
     } 
    }); 
} 
} 

GridViewAdapter.java

public class GridViewAdapter<T> extends BaseAdapter { 
Context mContext; 
//private final int length = 9;*/ 
private LayoutInflater layoutInflater; 
List<AppList> listStorage; 
MainActivity homeactivity; 
private int selectedIndex; 
private int selectedColor = Color.parseColor("#1b1b1b"); 
SparseBooleanArray mSparseBooleanArray; 
SharedPreferences settings; 
public GridViewAdapter(Context context, List<AppList> customizedListView) { 
    layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    this.mContext = context; 
    listStorage = customizedListView; 
    mSparseBooleanArray = new SparseBooleanArray(); 
} 
public void setSelectedIndex(int ind) { 
    selectedIndex = ind; 
    notifyDataSetChanged(); 
} 
public ArrayList<T> getCheckedItems() { 
    ArrayList<T> mTempArry = new ArrayList<T>(); 
    for (int i = 0; i < listStorage.size(); i++) { 
     if (mSparseBooleanArray.get(i)) { 
      mTempArry.add((T) listStorage.get(i)); 
     } 
    } 
    return mTempArry; 
} 
@Override 
public int getCount() { 
    return listStorage.size(); 
} 
public Object getItem(int position) { 
    return listStorage.get(position); 
} 
@Override 
public long getItemId(int position) { 
    return 0; 
} 
@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    final ViewHolder listViewHolder; 
    if (convertView == null) { 
     listViewHolder = new ViewHolder(); 
     LayoutInflater vi = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = vi.inflate(R.layout.add_apps_grid_item, parent, false); 
     listViewHolder.textInListView = (TextView) convertView.findViewById(R.id.item_name); 
     listViewHolder.imageInListView = (ImageView) convertView.findViewById(R.id.item_type); 
     listViewHolder.tvPkgName = (TextView) convertView.findViewById(R.id.tvPack); 
     listViewHolder.select_app = (CheckBox) convertView.findViewById(R.id.select_app); 
     convertView.setTag(listViewHolder); 
    } else { 
     listViewHolder = (ViewHolder) convertView.getTag(); 
    } 
    listViewHolder.textInListView.setText(listStorage.get(position).getName()); 
    listViewHolder.imageInListView.setImageDrawable(listStorage.get(position).getIcon()); 
    listViewHolder.tvPkgName.setText(listStorage.get(position).getPackageName()); 
    listViewHolder.select_app.setTag(position); 
    listViewHolder.select_app.setChecked(mSparseBooleanArray.get(position)); 
    final AppList item = listStorage.get(position); 
    listViewHolder.textInListView.setText(item.getName()); 
    SharedPreferences settings = mContext.getSharedPreferences("data", Context.MODE_PRIVATE); 
    boolean Checked = settings.getBoolean(item.getName(), false); 
    listViewHolder.select_app.setChecked(Checked); 
    listViewHolder.select_app.setOnCheckedChangeListener(new OnCheckedChangeListener() { 
     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
      Toast.makeText(mContext, "pkg name==" + listStorage.get(position).getPackageName(), Toast.LENGTH_LONG).show(); 
      if (listViewHolder.select_app.isChecked() == true) { 
       SharedPreferences settings = mContext.getSharedPreferences("data", Context.MODE_PRIVATE); 
       // Toast.makeText(mContext, "You deselected " + Context.MODE_PRIVATE, Toast.LENGTH_SHORT).show(); 
       mSparseBooleanArray.put((Integer) buttonView.getTag(), settings.edit().putBoolean(item.getName(), true).commit()); 
       // Toast.makeText(mContext, "You selected " + item.getName(), Toast.LENGTH_SHORT).show(); 
      } else { 
       SharedPreferences settings = mContext.getSharedPreferences("data", Context.MODE_PRIVATE); 
       mSparseBooleanArray.put((Integer) buttonView.getTag(), settings.edit().putBoolean(item.getName(), false).commit()); 
       // Toast.makeText(mContext, "You deselected " + item.getName(), Toast.LENGTH_SHORT).show(); 
      } 
      // Toast.makeText(mContext, "Shared prefernce---->" + mContext.toString(), Toast.LENGTH_SHORT).show(); 

     } 
    }); 

    return convertView; 
} 
OnCheckedChangeListener mCheckedChangeListener = new OnCheckedChangeListener() { 

    @Override 
    public void onCheckedChanged(CompoundButton buttonView, 
           boolean isChecked) { 
     mSparseBooleanArray.put((Integer) buttonView.getTag(), isChecked); 
    } 

}; 
static class ViewHolder { 
    TextView textInListView, tvPkgName; 
    ImageView imageInListView; 
    CheckBox select_app; 
} 
} 

AppList.java

public class AppList implements Parcelable { 
private String name; 
private String packageName; 
Drawable icon; 
private boolean selected; 

public AppList(Drawable icon, String name, String packageName) { 
    this.name = name; 
    this.icon = icon; 
    this.packageName = packageName; 
} 
protected AppList(Parcel in) { 
    name = in.readString(); 
    packageName = in.readString(); 
    selected = in.readByte() != 0; 
} 
public static final Creator<AppList> CREATOR = new Creator<AppList>() { 
    @Override 
    public AppList createFromParcel(Parcel in) { 
     return new AppList(in); 
    } 

    @Override 
    public AppList[] newArray(int size) { 
     return new AppList[size]; 
    } 
}; 
public String getName() { 
    return name; 
} 
public String getPackageName() { 
    return packageName; 
} 
public Drawable getIcon() { 
    return icon; 
} 
public String toString() { 
    return name; 
} 
@Override 
public int describeContents() { 
    return 0; 
} 
@Override 
public void writeToParcel(Parcel parcel, int i) { 
    parcel.writeString(name); 
    parcel.writeString(packageName); 
    parcel.writeByte((byte) (selected ? 1 : 0)); 
} 
public boolean isSelected() { 
    return selected; 
} 
public void setSelected(boolean selected) { 
    this.selected = selected; 
} 
} 

QuickLinksGridViewAdaptor.java

public class QuickLinksGridViewAdaptor<T> extends BaseAdapter { 
private Context context; 
//private final int length = 9;*/ 
private LayoutInflater layoutInflater; 
List<AppList> listStorage; 
MainActivity homeactivity; 
private int selectedIndex; 
SparseBooleanArray mSparseBooleanArray; 
int num = 1; 
public QuickLinksGridViewAdaptor(Context context, List<AppList> customizedListView) { 
    layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    listStorage = customizedListView; 
    mSparseBooleanArray = new SparseBooleanArray(); 
} 
public void setSelectedIndex(int ind) { 
    selectedIndex = ind; 
    notifyDataSetChanged(); 
} 
public ArrayList<T> getCheckedItems() { 
    ArrayList<T> mTempArry = new ArrayList<T>(); 
    for (int i = 0; i < listStorage.size(); i++) { 
     if (mSparseBooleanArray.get(i)) { 
      mTempArry.add((T) listStorage.get(i)); 
     } 
    } 
    return mTempArry; 
} 
@Override 
public int getCount() { 
    //return 8; 
    if(num*8 >= listStorage.size()){ 
     return listStorage.size(); 
    }else{ 
     return num*8; 
    } 
} 
public Object getItem(int position) { 
    return listStorage.get(position); 
} 
@Override 
public long getItemId(int position) { 
    return 0; 
} 
@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    ViewHolder listViewHolder; 
    if (convertView == null) { 
     listViewHolder = new ViewHolder(); 
     convertView = layoutInflater.inflate(R.layout.add_apps_grid_item1, parent, false); 
     listViewHolder.textInListView = (TextView) convertView.findViewById(R.id.item_name1); 
     listViewHolder.imageInListView = (ImageView) convertView.findViewById(R.id.item_type1); 
     convertView.setTag(listViewHolder); 

    } else { 
     listViewHolder = (ViewHolder) convertView.getTag(); 
    } 
    listViewHolder.textInListView.setText(listStorage.get(position).getName()); 
    listViewHolder.imageInListView.setImageDrawable(listStorage.get(position).getIcon()); 
    return convertView; 
} 
static class ViewHolder { 
    TextView textInListView; 
    ImageView imageInListView; 
} 
    } 

Answer 1

Vous pouvez utiliser la méthode savedInstanceState pour enregistrer et récupérer des données dans une activité ou vous pouvez enregistrer la valeur de contrôle booléen chaque temps que vous modifiez la valeur de votre sélection (état sélectionné ou non sélectionné) dans SharedPreferences en utilisant la clé comme nom/id de la valeur à sélectionner, et la valeur comme vrai ou faux.

Vous pouvez facilement vérifier les préférences partagées puis, pour vérifier si cette valeur est présente dans les préférences partagées ou non. Et utilisez la valeur booléenne pour afficher la sélection.

J'espère que vous obtenez cette réponse. Où avez-vous enregistré les données dans sharedPreference?