Question

我在尝试使用ListView时出现错误。

仔细查看android设备下方。错误。

它还说“在当前主题中找不到样式'listViewStyle'”

我还没有将适配器添加到此列表视图中。如果这是问题所在，请告诉我。

此活动的java代码

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);
}
}

这是我的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

您应该将ListView放在特定的布局中，例如RelativeLayout，LinearLayout等......

就像这个例子：

<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>

Answer 2

从右上角更改API级别，目前它是24.更改后运行应用程序。我希望它能奏效。

无法使用ListView

2 个答案: