如何从使用复选框和自定义适配器列表视图中选择列表中的项目？

本文介绍了如何从使用复选框和自定义适配器列表视图中选择列表中的项目？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个的ListView 与复选框就可以了。而且我在使用自定义适配器填充的ListView 。

I have a ListView with CheckBox on it. and i am using Custom Adapter to populate the ListView.

在我的 XML 文件我有一个按钮底部。我要的是让的ListView 键，当他/她点击了按钮得到位置的行用户选择号码选定的项目，使我能获得进一步的计算特定行的对象。

In my xml file i have a Button at bottom. what i want is let user select number of rows in ListView and when he/she clicked on the Button get the position of the selected items so that i could get the object for particular row for further calculations.

推荐答案

下面摘录不正是你想要的。

Below Snippet does exactly what you want.

package com.windrealm.android; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class PlanetsActivity extends Activity { private ListView mainListView; private Planet[] planets; private ArrayAdapter<Planet> listAdapter; private Button check; private Context context; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); context = PlanetsActivity.this; check = (Button) findViewById(R.id.check); // Find the ListView resource. mainListView = (ListView) findViewById(R.id.mainListView); // When item is tapped, toggle checked properties of CheckBox and // Planet. mainListView .setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View item, int position, long id) { Planet planet = listAdapter.getItem(position); planet.toggleChecked(); PlanetViewHolder viewHolder = (PlanetViewHolder) item .getTag(); viewHolder.getCheckBox().setChecked(planet.isChecked()); } }); // Create and populate planets. planets = (Planet[]) getLastNonConfigurationInstance(); if (planets == null) { planets = new Planet[] { new Planet("Mercury"), new Planet("Venus"), new Planet("Earth"), new Planet("Mars"), new Planet("Jupiter"), new Planet("Saturn"), new Planet("Uranus"), new Planet("Neptune"), new Planet("Ceres"), new Planet("Pluto"), new Planet("Haumea"), new Planet("Makemake"), new Planet("Eris") }; } ArrayList<Planet> planetList = new ArrayList<Planet>(); planetList.addAll(Arrays.asList(planets)); // Set our custom array adapter as the ListView's adapter. listAdapter = new PlanetArrayAdapter(this, planetList); mainListView.setAdapter(listAdapter); check.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { for (int i = 0; i < listAdapter.getCount(); i++) { Planet planet = listAdapter.getItem(i); if (planet.isChecked()) { Toast.makeText(context, planet.getName() + " is Checked!!", Toast.LENGTH_SHORT).show(); } } } }); } /** Holds planet data. */ private static class Planet { private String name = ""; private boolean checked = false; public Planet() { } public Planet(String name) { this.name = name; } public Planet(String name, boolean checked) { this.name = name; this.checked = checked; } public String getName() { return name; } public void setName(String name) { this.name = name; } public boolean isChecked() { return checked; } public void setChecked(boolean checked) { this.checked = checked; } public String toString() { return name; } public void toggleChecked() { checked = !checked; } } /** Holds child views for one row. */ private static class PlanetViewHolder { private CheckBox checkBox; private TextView textView; public PlanetViewHolder() { } public PlanetViewHolder(TextView textView, CheckBox checkBox) { this.checkBox = checkBox; this.textView = textView; } public CheckBox getCheckBox() { return checkBox; } public void setCheckBox(CheckBox checkBox) { this.checkBox = checkBox; } public TextView getTextView() { return textView; } public void setTextView(TextView textView) { this.textView = textView; } } /** Custom adapter for displaying an array of Planet objects. */ private static class PlanetArrayAdapter extends ArrayAdapter<Planet> { private LayoutInflater inflater; public PlanetArrayAdapter(Context context, List<Planet> planetList) { super(context, R.layout.simplerow, R.id.rowTextView, planetList); // Cache the LayoutInflate to avoid asking for a new one each time. inflater = LayoutInflater.from(context); } @Override public View getView(int position, View convertView, ViewGroup parent) { // Planet to display Planet planet = (Planet) this.getItem(position); // The child views in each row. CheckBox checkBox; TextView textView; // Create a new row view if (convertView == null) { convertView = inflater.inflate(R.layout.simplerow, null); // Find the child views. textView = (TextView) convertView .findViewById(R.id.rowTextView); checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01); // Optimization: Tag the row with it's child views, so we don't // have to // call findViewById() later when we reuse the row. convertView.setTag(new PlanetViewHolder(textView, checkBox)); // If CheckBox is toggled, update the planet it is tagged with. checkBox.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { CheckBox cb = (CheckBox) v; Planet planet = (Planet) cb.getTag(); planet.setChecked(cb.isChecked()); } }); } // Reuse existing row view else { // Because we use a ViewHolder, we avoid having to call // findViewById(). PlanetViewHolder viewHolder = (PlanetViewHolder) convertView .getTag(); checkBox = viewHolder.getCheckBox(); textView = viewHolder.getTextView(); } // Tag the CheckBox with the Planet it is displaying, so that we can // access the planet in onClick() when the CheckBox is toggled. checkBox.setTag(planet); // Display planet data checkBox.setChecked(planet.isChecked()); textView.setText(planet.getName()); return convertView; } } public Object onRetainNonConfigurationInstance() { return planets; } }