如何处理列表视图中点击事件的android？ [英] How to handle the click event in Listview in android?

问题描述

下面是我的测试code创建列表视图，列表视图中显示成功，但是，没有在点击事件的错误。我想创建一个意图发送硬code消息到一个新的活动。然而，它显示错误行

 意向意图=新的意图（背景下，SendMessage.class）;
 

所以，问题是，我应该为这个类呢？

另外，代替c中的输出消息硬$ C $，如何捕捉在列表视图中的行的数据，并传递到新的活动？例如 BBB，AAA，R.drawable.tab1_hdpi 的第一行。

感谢。

 公共类MainActivity延伸活动{
    公共最后静态字符串EXTRA_MESSAGE =com.example.ListViewTest.MESSAGE;

    @覆盖
    保护无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        ArrayList的＆LT;一个ListEntry＆GT;成员=新的ArrayList＆LT;一个ListEntry＆GT;（）;
        members.add（新一个ListEntry（BBB，AAA，R.drawable.tab1_hdpi））;
        members.add（新一个ListEntry（CCC，DDD，R.drawable.tab2_hdpi））;
        members.add（新一个ListEntry（阿萨，第一百一十五号，R.drawable.tab3_hdpi））;
        members.add（新一个ListEntry（BcxsadvBB，AcxdxvAA））;
        members.add（新一个ListEntry（BcxvadsBB，AcxzvAA））;
        members.add（新一个ListEntry（BcxvBB，AcxvAA））;
        members.add（新一个ListEntry（BvBB，AcxsvAA））;
        members.add（新一个ListEntry（BcxvBB，AcxsvzAA））;
        members.add（新一个ListEntry（Bcxadv，AcsxvAA））;
        members.add（新一个ListEntry（BcxcxB，AcxsvAA））;
        ListView的LV =（ListView控件）findViewById（R.id.listView1）;
        Log.i（testTag，启动适配器之前）;
        StringArrayAdapter广告=新StringArrayAdapter（成员，这一点）;
        Log.i（testTag，启动适配器之后）;
        Log.i（testTag，设置适配器）;
        lv.setAdapter（广告）;
        lv.setOnItemClickListener（新OnItemClickListener（）{
            @覆盖
            公共无效onItemClick（适配器视图＆LT;＆GT;母公司视图中查看，INT位置，
                    长ID）{
                意向意图=新的意图（背景下，SendMessage.class）;
                字符串消息=ABC;
                intent.putExtra（EXTRA_MESSAGE，消息）;
                startActivity（意向）;
            }
        }）;
    }
 

解决方案

我看不到你在哪里申报上下文。在意向创作，你可以使用的目的 MainActivity.this

  lv.setOnItemClickListener（新OnItemClickListener（）{
            @覆盖
            公共无效onItemClick（适配器视图＆LT;＆GT;母公司视图中查看，INT位置，
                    长ID）{
                意向意图=新的意图（MainActivity.this，SendMessage.class）;
                字符串消息=ABC;
                intent.putExtra（EXTRA_MESSAGE，消息）;
                startActivity（意向）;
            }
        }）;
 

要检索的对象后，你点击就可以使用适配器视图：

 一个ListEntry项=（一个ListEntry）parent.getItemAtPosition（位置）;
 

The below is my testing code to create the list view, the list view display successfully, however, there is error in click event. I would like to create an intent to send a hardcode message to an new activity. However, it show error for the line

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

So , the problem is , what should I provide for this class?

Also , instead of hard code the output message, how to capture the data in list view row and pass to the new activity? e.g. BBB,AAA,R.drawable.tab1_hdpi for the first row.

Thanks.

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);
            }
        });
    }

解决方案

I can not see where do you declare context. For the purpose of the intent creation you can use 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);
            }
        });

To retrieve the object upon you have clicked you can use the AdapterView:

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

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