如何在我的 SMS 应用程序中设置 onItemClickListener

Question

1.如何设置 onItemClickListener 以便如果我进入 SMS 收件箱并单击联系人，它将打开一个新活动，显示我和该联系人之间的对话视图？

2.我的第二个问题是我的代码应该把 onItemClickListener 放在哪里？

package techyapp.greg.spanglish;

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class Inbox extends Activity implements OnItemClickListener {

    ListView lViewSMS;
    String thread_id, body;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.inbox);

        ListView list = (ListView) findViewById(R.id.lvlistViewSMS);
        List<String> msgList = getSMS();

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, msgList);
        list.setAdapter(adapter);

    }

    public List<String> getSMS() {
        List<String> sms = new ArrayList<String>();
        Uri uriSMSURI = Uri.parse("content://mms-sms/conversations/");
        Cursor cur = getContentResolver().query(uriSMSURI, null, null, null,
                "date");

        while (cur.moveToNext()) {
            String address = cur.getString(cur.getColumnIndex("address"));
            String body = cur.getString(cur.getColumnIndexOrThrow("body"));
            String person = cur.getString(cur.getColumnIndexOrThrow("person"));
            String thread_id = cur.getString(cur
                    .getColumnIndexOrThrow("thread_id"));
            sms.add(address + " " + person + "\n" + body);

        }
        return sms;

    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        Intent myIntent = new Intent(getApplicationContext(),
                Conversation.class);
        startActivity(myIntent);
    }
}    

---

01-21 15:33:33.674：E/AndroidRuntime(4749)：致命异常：主要

01-21 15:33:33.674：E/AndroidRuntime(4749)：java.lang.RuntimeException：无法实例化活动 ComponentInfo{techyapp.greg.spanglish/techyapp.greg.spanglish.Conversation}：java.lang。空指针异常

01-21 15:33:33.674：E/AndroidRuntime(4749)：在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2255)

01-21 15:33:33.674: E/AndroidRuntime(4749): 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)

01-21 15:33:33.674: E/AndroidRuntime(4749): at android.app.ActivityThread.access$600(ActivityThread.java:153)

01-21 15:33:33.674: E/AndroidRuntime(4749): 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)

01-21 15:33:33.674: E/AndroidRuntime(4749): 在 android.os.Handler.dispatchMessage(Handler.java:99)

01-21 15:33:33.674: E/AndroidRuntime(4749): 在 android.os.Looper.loop(Looper.java:137)

01-21 15:33:33.674: E/AndroidRuntime(4749): 在 android.app.ActivityThread.main(ActivityThread.java:5289)

01-21 15:33:33.674: E/AndroidRuntime(4749): at java.lang.reflect.Method.invokeNative(Native Method)

01-21 15:33:33.674: E/AndroidRuntime(4749): at java.lang.reflect.Method.invoke(Method.java:525)

01-21 15:33:33.674: E/AndroidRuntime(4749): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)

01-21 15:33:33.674: E/AndroidRuntime(4749): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)

01-21 15:33:33.674: E/AndroidRuntime(4749): at dalvik.system.NativeStart.main(Native Method)

01-21 15:33:33.674：E/AndroidRuntime(4749)：原因：java.lang.NullPointerException

01-21 15:33:33.674: E/AndroidRuntime(4749): at techyapp.greg.spanglish.Conversation.(Conversation.java:23)

01-21 15:33:33.674: E/AndroidRuntime(4749): at java.lang.Class.newInstanceImpl(Native Method)

01-21 15:33:33.674: E/AndroidRuntime(4749): at java.lang.Class.newInstance(Class.java:1130)

01-21 15:33:33.674: E/AndroidRuntime(4749): 在 android.app.Instrumentation.newActivity(Instrumentation.java:1061)

01-21 15:33:33.674：E/AndroidRuntime(4749)：在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2246)

01-21 15:33:33.674: E/AndroidRuntime(4749): ... 11 更多

Answer 1

您似乎忘记将项目点击侦听器添加到列表视图。

list.setOnItemClickListener(this);

您还需要将相关数据传递给新活动。

你可以做类似的事情

    Intent myIntent = new Intent(getApplicationContext(),
            Conversation.class);
    myIntent.putExtra("msg", myMsgData);
    startActivity(myIntent);

请记住，myMsgData 必须是在活动之间传递的少数受支持格式之一。看看这个帖子How do I pass data between Activities in Android application?