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我正在使用一個片段，我使用GridView來生成一些類別。當用戶選擇一個類別時，我將用一個新的片段替換之前的片段，該片段用於獲取該類別的詳細信息。但是當我回到前一個片段顯示的類別時，我想使用戶以前點擊過的選擇的類別。我試圖使用選擇器，但它不適合我。這裏是我的代碼。如何在基於點擊位置的GridView中選擇TextView？
這裏是我的佈局xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="20dp"
>
<GridView
android:id="@+id/hindernisTypGridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="auto_fit"
android:columnWidth="190dp"
android:verticalSpacing="20dp"
android:layout_below="@+id/topBar"
android:horizontalSpacing="5dp"
android:paddingLeft="32dp"
android:paddingRight="32dp"
/>
</LinearLayout>
這裏是我的GridView的自定義XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools=" http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="190dp"
android:layout_height="180dp"
android:padding="2dp"
tools:ignore="MissingPrefix"
>
<TextView
android:textColor="@color/redText"
android:textSize="37.14sp"
android:layout_gravity="center_horizontal"
android:gravity="center_vertical"
android:textAlignment="center"
android:layout_width="match_parent"
android:layout_height="180dp"
android:text="OBW"
android:id="@+id/hindernisTypTextView"
fontPath="DBSansRegular.otf"
android:textAppearance="@style/DBSansRegular"
android:background="@drawable/grid_view_item_selector"
/>
</RelativeLayout>
這是我的選擇
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/redText" android:state_pressed="true"/>
</selector>
這裏是用來給片段顯示類別
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.Toast;
import com.example.anikdey.railwayapp.R;
import com.example.anikdey.railwayapp.adapters.HindernisTypGridViewAdapter;
import com.example.anikdey.railwayapp.models.HindernisTyp;
public class HindernisTypFragment extends Fragment {
private GridView projectListGridView;
private View view;
private HindernisTyp hindernisTyp;
private HindernisTypGridViewAdapter hindernisTypGridViewAdapter;
private OnHindernisTypSelectedListener hindernisTypSelectedListener;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.kategorie_wahlen_grid_view, container, false);
projectListGridView = (GridView) view.findViewById(R.id.kategoryWahlenGridView);
hindernisTyp = new HindernisTyp();
hindernisTypGridViewAdapter = new HindernisTypGridViewAdapter(getActivity().getApplicationContext(), hindernisTyp.getHindernisTyps());
projectListGridView.setAdapter(hindernisTypGridViewAdapter);
projectListGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setSelected(true);
hindernisTypSelectedListener.setHindernisTyp(hindernisTyp.getHindernisTyps().get(position).getHindernisTypName());
FragmentManager fragmentManager = getActivity().getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new DetailsFragment(),"DetailsFragment");
fragmentTransaction.addToBackStack("df");
fragmentTransaction.commit();
}
});
return view;
}
}
我已經使用在GridView中顯示的類別適配器
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.anikdey.railwayapp.R;
import com.example.anikdey.railwayapp.models.HindernisTyp;
import java.util.ArrayList;
import java.util.List;
public class HindernisTypGridViewAdapter extends BaseAdapter {
private Context context;
private List<HindernisTyp> hindernisTyps = new ArrayList<HindernisTyp>();
public HindernisTypGridViewAdapter(Context context, List<HindernisTyp> hindernisTyps){
this.context = context;
this.hindernisTyps = hindernisTyps;
}
@Override
public int getCount() {
return hindernisTyps.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
private static final class ViewHolder {
private TextView hindernisTypTextView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.hindernis_typ_grid_view_custom_layout, null, true);
holder = new ViewHolder();
holder.hindernisTypTextView = (TextView) convertView.findViewById(R.id.hindernisTypTextView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.hindernisTypTextView.setText(hindernisTyps.get(position).getHindernisTypName());
return convertView;
}
}
您可以使用「觀察者模式」來實現自己的目標，記錄片段應對在GridView中位置的位置，並在片段的生命週期方法中恢復選定的狀態 –