Kann ListView nicht verwenden

Question

Meine Vorschau gibt einen Fehler, während ich versuche, ListView zu verwenden.

Blick sorgfältig unter dem Android-Gerät. der Fehler.

es sagt auch, „Failed Stil finden‚listViewStyle‘in aktuellem Thema“

Ich habe noch nicht den Adapter zu dieser Liste Ansicht hinzugefügt. Wenn das das Problem ist, dann sag es mir.

mein Java-Code für diese Tätigkeit

package com.justforyou.bestnarutosongs; 

import android.media.AudioManager; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.WindowManager; 

public class SongsListActivity extends AppCompatActivity { 

private MediaPlayer mediaplayer; 
private AudioManager mAudioManager; 
private AudioManager.OnAudioFocusChangeListener mOnAudioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() 
{ 
    @Override 
    public void onAudioFocusChange(int focusChange){ 
     if(focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK || focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT){ 
      mediaplayer.pause(); 
      mediaplayer.seekTo(0); 
     } 
     else if(focusChange == AudioManager.AUDIOFOCUS_GAIN){ 
      mediaplayer.start(); 
     } 
     else if(focusChange == AudioManager.AUDIOFOCUS_LOSS){ 
      if(mediaplayer != null) 
      { 
       mediaplayer.release(); 
       mediaplayer = null; 
      } 
     } 
    } 
}; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    setContentView(R.layout.activity_songs_list); 
} 
} 

hier ist mein style.xml

<!-- Copyright (C) 2016 The Android Open Source Project 

Licensed under the Apache License, Version 2.0 (the "License"); 
you may not use this file except in compliance with the License. 
You may obtain a copy of the License at 

     http://www.apache.org/licenses/LICENSE-2.0 

Unless required by applicable law or agreed to in writing, software 
distributed under the License is distributed on an "AS IS" BASIS, 
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
See the License for the specific language governing permissions and 
limitations under the License. 
--> 

<!-- Base application theme. --> 
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"> 
    <item name="colorPrimary">@color/primary_color</item> 
    <item name="colorPrimaryDark">@color/primary_dark_color</item> 
</style> 

<!-- Style for a category of vocabulary words --> 
<style name="CategoryStyle"> 
    <item name="android:layout_width">match_parent</item> 
    <item name="android:layout_height">@dimen/list_item_height</item> 
    <item name="android:gravity">center_vertical</item> 
    <item name="android:padding">16dp</item> 
    <item name="android:textColor">@android:color/white</item> 
    <item name="android:textStyle">bold</item> 
    <item name="android:textAppearance">?android:textAppearanceMedium</item> 
</style> 

Answer 1

Ändern der API-Ebene von rechts oben, Derzeit ist es ist 24. Nach dem Ändern führen Sie die Anwendung aus. Ich hoffe, dass es funktionieren wird.

Answer 2

Sie Ihre Listview in einem bestimmten Layout wie RelativeLayout, Linearlayout, etc ...

wie in diesem Beispiel setzen sollen:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:padding="6dip" > 

    <ListView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/listview" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" /> 

</RelativeLayout>