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我按照教程學習瞭如何在操作欄中正確顯示自定義列表。 問題是,現在我想要突出顯示(或選擇)列表中的特定項目,例如當用戶退出應用程序時,應該記下用戶在列表中選擇的最後一個項目是什麼(我可以做到這一點使用共享偏好),然後當用戶再次打開我的應用時,列表視圖應該將自己恢復到最後選擇的項目。如何在操作欄中引用列表視圖Android
我不知道如何在自定義列表視圖中以編程方式選擇一個項目。也許我必須先反悔。但我也不知道。
這裏是我的代碼: bus_names.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:yourapp="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp" >
<ImageView
android:id="@+id/busIcon"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_marginRight="5dp"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/busTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="Alaknanda"
android:textColor="@color/white"
android:textSize="18sp"
android:textStyle="bold" />
</LinearLayout>
SpinnerNavItem.java:
package com.hpubts50.hpubustracker.model;
public class SpinnerNavItem {
private String title;
private int icon;
public SpinnerNavItem(String title, int icon){
this.title = title;
this.icon = icon;
}
public String getTitle(){
return this.title;
}
public int getIcon(){
return this.icon;
}
}
BusNavigation.java:
package com.hpubts50.hpubustracker.adapter;
import java.util.ArrayList;
import android.content.Context;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
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.hpubts50.hpubustracker.R;
import com.hpubts50.hpubustracker.model.SpinnerNavItem;
public class BusNavigation extends BaseAdapter {
private ImageView busIcon;
private TextView busTitle;
private ArrayList<SpinnerNavItem> spinnerNavItem;
private Context context;
public BusNavigation(Context context, ArrayList<SpinnerNavItem> spinnerNavItem) {
this.spinnerNavItem = spinnerNavItem;
this.context = context;
}
@Override
public int getCount() {
return spinnerNavItem.size();
}
@Override
public Object getItem(int index) {
return spinnerNavItem.get(index);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(ActionBarActivity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.bus_names, parent, false);
}
busIcon = (ImageView) convertView.findViewById(R.id.busIcon);
busTitle = (TextView) convertView.findViewById(R.id.busTitle);
busIcon.setImageResource(spinnerNavItem.get(position).getIcon());
busIcon.setVisibility(View.GONE);
busTitle.setText(spinnerNavItem.get(position).getTitle());
return convertView;
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(ActionBarActivity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.bus_names, parent, false);
}
busIcon = (ImageView) convertView.findViewById(R.id.busIcon);
busTitle = (TextView) convertView.findViewById(R.id.busTitle);
busIcon.setImageResource(spinnerNavItem.get(position).getIcon());
busTitle.setText(spinnerNavItem.get(position).getTitle());
return convertView;
}
}