Java Android.R.id.list ListView片段异常

我有一个android应用程序，当我添加

ListFragment

时，它会不断崩溃。我不断地得到和错误，并已阅读了相同的错误消息的其他网站。我还没有找到任何对我有用的东西。例外情况是：

Unable to start Activity Component {com.alarm/com.alarm.activity.AlarmListActivity} java.lang.RuntimeException: Content has view with android.R.id.list that is not a ListView class.

但这很奇怪，因为我没有id为“list”的ListView。下面是我的片段是如何定义的

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/alarm_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

活动：

    package com.alarm.activity;

import android.app.Activity;
import android.app.FragmentManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import com.alarm.R;
import com.alarm.fragments.AlarmListFragment;

public class AlarmListActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FragmentManager fm = getFragmentManager();  

          if (fm.findFragmentById(android.R.id.content) == null) {  
           fm.beginTransaction().add(android.R.id.content, new AlarmListFragment()).commit();  
          }  

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.alarm_list_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.action_add_alarm:
            Intent addAlarm = new Intent(this, AlarmCreateActivity.class);
            startActivity(addAlarm);
            return true;
        case R.id.settings:
            Intent settings = new Intent(this, SettingsActivity.class);
            startActivity(settings);
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
}

---

如果您能提供任何帮助或解释为什么会发生这种情况，我们将不胜感激

您必须使用

android:id=“@id/android:list”

作为您的

ListView

android前缀必须在at符号之后

    package com.alarm.activity;

import android.app.Activity;
import android.app.FragmentManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import com.alarm.R;
import com.alarm.fragments.AlarmListFragment;

public class AlarmListActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FragmentManager fm = getFragmentManager();  

          if (fm.findFragmentById(android.R.id.content) == null) {  
           fm.beginTransaction().add(android.R.id.content, new AlarmListFragment()).commit();  
          }  

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.alarm_list_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.action_add_alarm:
            Intent addAlarm = new Intent(this, AlarmCreateActivity.class);
            startActivity(addAlarm);
            return true;
        case R.id.settings:
            Intent settings = new Intent(this, SettingsActivity.class);
            startActivity(settings);
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
}