Android 缺少ListView

我一直在网上寻找答案，但什么也没找到

所以我的问题是：我发现了一个有趣的教程，介绍了如何在android上开发自己的简单播放器，并开始将这些代码集成到我的程序中，但在视图方面遇到了问题。我甚至不明白为什么会出现这种情况：我尝试过在任何地方插入ListView，但什么也没发生。这是我的代码：

EasyLippingActivity.java

package my.easyflipping;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ViewFlipper;

public class EasyflippingActivity extends ListActivity {

    private ViewFlipper flipper;
    private static final String MEDIA_PATH = new String("/sdcard/");
    private List<String> songs = new ArrayList<String>();

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        this.flipper = (ViewFlipper)findViewById(R.id.flipper);
        Button groups;
        (groups = (Button)findViewById(R.id.groups)).setBackgroundDrawable(this.getResources().getDrawable(R.drawable.group));
        Button songs;
        (songs = (Button)findViewById(R.id.songs)).setBackgroundDrawable(this.getResources().getDrawable(R.drawable.songs));
        groups.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                im_going_left();
                flipper.showNext();
                groups_func();
            }
            });
        songs.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                update_song_list();
                im_going_right();
                flipper.showNext();
                songs_func();
            }
        });
    }

    public void update_song_list() {
        File home = new File(MEDIA_PATH);
        if (home.listFiles(new Mp3Filter()).length > 0) {
                for (File file : home.listFiles(new Mp3Filter())) {
                        songs.add(file.getName());
                }

                ArrayAdapter<String> songList = new ArrayAdapter<String>(this,
                                R.layout.song_item, songs);
                setListAdapter(songList);
        }
}


    public void songs_func ()
    {
        Button back;

        back = (Button)findViewById(R.id.back);
        back.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                im_going_left();
                flipper.showPrevious();
                return;

            }
        });
    }

    public void groups_func()
    {
        Button back;

        back = (Button)findViewById(R.id.back);
        back.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                im_going_right();
                flipper.showPrevious();
                return;

            }
        });
    }

    public void im_going_right()
    {
         Animation s_in  = AnimationUtils.loadAnimation(this, R.layout.slideinleft);
         Animation s_out = AnimationUtils.loadAnimation(this, R.layout.slideoutright);
         this.flipper.setInAnimation(s_in);
         this.flipper.setOutAnimation(s_out);
    }

    public void im_going_left()
    {
        Animation s_in  = AnimationUtils.loadAnimation(this, R.layout.slidein);
        Animation s_out = AnimationUtils.loadAnimation(this, R.layout.slideout);
        this.flipper.setInAnimation(s_in);
        this.flipper.setOutAnimation(s_out);
    }
}

song_item.xml

<?xml version="1.0" encoding="utf-8"?>
    <TextView android:id="@+id/text1" xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

如果有人帮助我，我将非常感激。提前谢谢你

 Your content must have a ListView whose id attribute is 'android.R.id.list'

如果您正在使用列表活动，则必须具有id为“@android:id/list”的listView

您正在扩展一个ListActivity，它要求您在布局中有一个id为

@android:id/list的ListView。尝试在main.xml中更改此选项：

<ListView android:id="@+id/list"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:layout_weight="1"
          android:drawSelectorOnTop="false"/>



为此：

<ListView android:id="@android:id/list"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:layout_weight="1"
          android:drawSelectorOnTop="false"/>


如果要扩展ListActivity，则必须在布局中具有id为
@android:id/list
的ListView。我有它，但仅在我的flipper的第二个布局中。所以我的问题是如何让系统看到它。@user1493420很高兴我能帮忙！请单击我答案左上角的复选标记，表示此问题已解决。
 Your content must have a ListView whose id attribute is 'android.R.id.list'

<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android”
android:orientation=”vertical”
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”
>
<TextView
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:text=” “
android:id=”@+id/selection”
/>
<ListView
android:id=”@android:id/list”
android:choiceMode=”multipleChoice”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”/>
</LinearLayout>

<ListView android:id="@+id/list"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:layout_weight="1"
          android:drawSelectorOnTop="false"/>

<ListView android:id="@android:id/list"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:layout_weight="1"
          android:drawSelectorOnTop="false"/>