如何在android中的Listview中处理click事件？

时间：2013-07-25 07:30:02

标签： android listview android-intent onitemclicklistener onitemclick

以下是我的测试代码，用于创建列表视图，列表视图显示成功，但是，点击事件中存在错误。我想创建一个向新活动发送硬编码消息的意图。但是，它显示行

的错误 
Intent intent = new Intent(context, SendMessage.class);

所以，问题是，我应该为这个课提供什么？

另外，输出消息代替硬编码，如何捕获列表视图行中的数据并传递给新活动？例如第一行BBB,AAA,R.drawable.tab1_hdpi。

感谢。

public class MainActivity extends Activity {
    public final static String EXTRA_MESSAGE = "com.example.ListViewTest.MESSAGE";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ArrayList<ListEntry> members = new ArrayList<ListEntry>(); 
        members.add(new ListEntry("BBB","AAA",R.drawable.tab1_hdpi));
        members.add(new ListEntry("ccc","ddd",R.drawable.tab2_hdpi));
        members.add(new ListEntry("assa","cxv",R.drawable.tab3_hdpi));
        members.add(new ListEntry("BcxsadvBB","AcxdxvAA"));
        members.add(new ListEntry("BcxvadsBB","AcxzvAA"));
        members.add(new ListEntry("BcxvBB","AcxvAA"));
        members.add(new ListEntry("BvBB","AcxsvAA"));
        members.add(new ListEntry("BcxvBB","AcxsvzAA"));
        members.add(new ListEntry("Bcxadv","AcsxvAA"));
        members.add(new ListEntry("BcxcxB","AcxsvAA"));
        ListView lv = (ListView)findViewById(R.id.listView1);
        Log.i("testTag","before start adapter");
        StringArrayAdapter ad = new StringArrayAdapter (members,this);
        Log.i("testTag","after start adapter");
        Log.i("testTag","set adapter");
        lv.setAdapter(ad);
        lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                    long id) {
                Intent intent = new Intent(context, SendMessage.class);
                String message = "abc";
                intent.putExtra(EXTRA_MESSAGE, message);
                startActivity(intent);
            }
        });
    }

6 个答案:

答案 0 :(得分：93)

我看不出你在哪里声明context。出于创建意图的目的，您可以使用MainActivity.this 

 lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                    long id) {
                Intent intent = new Intent(MainActivity.this, SendMessage.class);
                String message = "abc";
                intent.putExtra(EXTRA_MESSAGE, message);
                startActivity(intent);
            }
        });

要在点击后检索对象，可以使用AdapterView：

ListEntry entry = (ListEntry) parent.getItemAtPosition(position);

答案 1 :(得分：13)

ListView具有Item click侦听器回调。您应该在onItemClickListener中设置ListView。回调包含AdapterView和position作为参数。哪个可以给你ListEntry。 

lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                    long id) {
                ListEntry entry= (ListEntry) parent.getAdapter().getItem(position);
                Intent intent = new Intent(MainActivity.this, SendMessage.class);
                String message = entry.getMessage();
                intent.putExtra(EXTRA_MESSAGE, message);
                startActivity(intent);
            }
        });

答案 2 :(得分：6)

正如您所说的

，您的代码中出现了错误 
Intent intent = new Intent(context, SendMessage.class);

这是因为您将OnItemClickListener匿名类的上下文提供给Intent构造函数但是根据Intent的构造函数

android.content.Intent.Intent(Context packageContext, Class<?> cls)

您必须提供您使用intent的活动的上下文，即MainActivity类上下文。所以给出错误的陈述将转换为

Intent intent = new Intent(MainActivity.this, SendMessage.class);

另外，要将此消息从此MainActivity发送到SendMessage类，请参阅下面的代码

lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                    long id) {
                ListEntry entry= (ListEntry) parent.getAdapter().getItem(position);
                Intent intent = new Intent(MainActivity.this, SendMessage.class);
                intent.putExtra(EXTRA_MESSAGE, entry.getMessage());
                startActivity(intent);
            }
        });

如果这对你有帮助，请告诉我

修改： - 如果你发现了一些问题来获取list的值，那么就有一件事会解析你的数组列表

ArrayList<ListEntry> members = new ArrayList<ListEntry>();

全局，即在创建和更改您的监听器之前，如下所示

 lv.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position,
                        long id) {
                    Intent intent = new Intent(MainActivity.this, SendMessage.class);
                    intent.putExtra(EXTRA_MESSAGE, members.get(position));
                    startActivity(intent);
                }
            });

所以你的整个代码看起来像

public class MainActivity extends Activity {
    public final static String EXTRA_MESSAGE = "com.example.ListViewTest.MESSAGE";
ArrayList<ListEntry> members = new ArrayList<ListEntry>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        members.add(new ListEntry("BBB","AAA",R.drawable.tab1_hdpi));
        members.add(new ListEntry("ccc","ddd",R.drawable.tab2_hdpi));
        members.add(new ListEntry("assa","cxv",R.drawable.tab3_hdpi));
        members.add(new ListEntry("BcxsadvBB","AcxdxvAA"));
        members.add(new ListEntry("BcxvadsBB","AcxzvAA"));
        members.add(new ListEntry("BcxvBB","AcxvAA"));
        members.add(new ListEntry("BvBB","AcxsvAA"));
        members.add(new ListEntry("BcxvBB","AcxsvzAA"));
        members.add(new ListEntry("Bcxadv","AcsxvAA"));
        members.add(new ListEntry("BcxcxB","AcxsvAA"));
        ListView lv = (ListView)findViewById(R.id.listView1);
        Log.i("testTag","before start adapter");
        StringArrayAdapter ad = new StringArrayAdapter (members,this);
        Log.i("testTag","after start adapter");
        Log.i("testTag","set adapter");
        lv.setAdapter(ad);
        lv.setOnItemClickListener(new OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position,
                            long id) {
                        Intent intent = new Intent(MainActivity.this, SendMessage.class);
                        intent.putExtra(EXTRA_MESSAGE, members.get(position).getMessage());
                        startActivity(intent);
                    }
                });
    }

其中getMessage（）将是您在ListEntry类中指定的getter方法，用于获取先前设置的消息。

答案 3 :(得分：6)

首先，该类必须实现点击侦听器： 

implements OnItemClickListener

然后将侦听器设置为ListView 

yourList.setOnItemclickListener(this);

最后，创建click方法：

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Toast.makeText(MainActivity.this, "You Clicked at ",   
 Toast.LENGTH_SHORT).show();
}

答案 4 :(得分：2)

    //get main activity
    final Activity main_activity=getActivity();

    //list view click listener
    final ListView listView = (ListView) inflatedView.findViewById(R.id.listView_id);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String stringText;

            //in normal case
            stringText= ((TextView)view).getText().toString();                

            //in case if listview has separate item layout
            TextView textview=(TextView)view.findViewById(R.id.textview_id_of_listview_Item);
            stringText=textview.getText().toString();                

            //show selected
            Toast.makeText(main_activity, stringText, Toast.LENGTH_LONG).show();
        }
    });

    //populate listview

答案 5 :(得分：2)

根据我的测试，

  1. 实现OnItemClickListener - ＆gt;作品。

  2. setOnItemClickListener - ＆gt;作品。

  3. 默认情况下，ListView是可点击的（API 19）

    4. 重要的是，“click”仅适用于TextView（如果选择simple_list_item_1.xml作为项目）。这意味着如果您为ListView提供文本数据，单击文本区域时“单击”将起作用。点击空白区域不会触发“点击事件”。

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