如何显示音频文件在Android的列表视图？ [英] How to show audio files in a listview in Android?

问题描述

我在对 SD卡特定目录中的一些音频文件。我需要表现出他们的名字在Android的列表视图，如果我要玩或删除特定文件，我可以做到这一点通过列表视图？我该怎么办呢？

 公共类MyPerformanceArrayAdapter扩展ArrayAdapter＆LT;字符串＆GT; {
    私人最终上下文的背景下;
    私人最终的String []值;

    公共MyPerformanceArrayAdapter（上下文的背景下，的String []值）{
        超（背景下，R.layout.main，价值观）;
        this.context =背景;
        this.values​​ =值;
    }

    @覆盖
    公共查看getView（INT位置，查看convertView，ViewGroup中父）{
        LayoutInflater充气=（LayoutInflater）上下文
                .getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
        查看rowView = inflater.inflate（R.layout.main，父母，假）;
        TextView中的TextView =（TextView中）rowView.findViewById（R.id.label）;
        ImageView的ImageView的=（ImageView的）rowView.findViewById（R.id.icon）;
        textView.setText（值[位置]）;
        //更改图标的Windows和iPhone
        字符串s =数值[立场]
        如果（s.startsWith（Windows7的）|| s.startsWith（iPhone）
                || s.startsWith（中的Solaris））{
            //imageView.setImageResource(R.drawable.no）;
        } 其他 {
            //imageView.setImageResource(R.drawable.ok）;
        }
        返回rowView;
    }
}

公共类SimpleListActivity扩展ListActivity {
    公共无效的onCreate（包冰柱）{
        super.onCreate（冰柱）;
        的String []值=新的String [] {机器人，iPhone，WindowsMo​​bile的，
                黑莓，WebOS的，Ubuntu的，Windows7的，最大OS X，
                Linux的，OS / 2};
        MyPerformanceArrayAdapter适配器=新MyPerformanceArrayAdapter（这一点，值）;
        setListAdapter（适配器）;
    }
}
 

这code是一个简单的列表视图。我需要从到适配器类特定的目录获取他们的名字。我该怎么办呢？

如果我做任何更改到特定的文件，这些都应该反映在列表视图。

解决方案

 公共类ReadAllFilesFromPathActivity延伸活动{
    / **第一次创建活动时调用。 * /
    私人列表＆LT;字符串＆GT; myList中;
    档案文件;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;
        ListView控件的ListView =（ListView控件）findViewById（R.id.mylist）;
        myList上=新的ArrayList＆LT;字符串＆GT;（）;

        文件目录= Environment.getExternalStorageDirectory（）;
        文件=新的文件（目录+/测试）;
        文件列表[] = file.listFiles（）;

        的for（int i = 0; I＆LT; list.length;我++）
        {
                myList.add（名单[I] .getName（））;
        }
        ArrayAdapter＆LT;字符串＆GT;适配器=新的ArrayAdapter＆LT;字符串＆GT;（这一点，
                android.R.layout.simple_list_item_1，android.R.id.text1，myList中）;
        listView.setAdapter（适配器）; //在列表中设置的所有文件。
    }
}
 

I have some audio files in a particular directory on the SD card. I need to show their names in a listview in Android, and if I want to play or delete that particular file, can I do this through that list view? How can I do it?

public class MyPerformanceArrayAdapter extends ArrayAdapter<String> {
    private final Context context;
    private final String[] values;

    public MyPerformanceArrayAdapter(Context context, String[] values) {
        super(context, R.layout.main, values);
        this.context = context;
        this.values = values;
    }           

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View rowView = inflater.inflate(R.layout.main, parent, false);
        TextView textView = (TextView) rowView.findViewById(R.id.label);
        ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
        textView.setText(values[position]);
        // Change the icon for Windows and iPhone
        String s = values[position];
        if (s.startsWith("Windows7") || s.startsWith("iPhone")
                || s.startsWith("Solaris")) {
            //imageView.setImageResource(R.drawable.no);
        } else {
            //imageView.setImageResource(R.drawable.ok);
        }    
        return rowView;
    }
}

public class SimpleListActivity extends ListActivity {
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        String[] values = new String[] { "Android", "iPhone", "WindowsMobile",
                "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
                "Linux", "OS/2" };
        MyPerformanceArrayAdapter adapter = new MyPerformanceArrayAdapter(this, values);
        setListAdapter(adapter);
    }    
}

This code is a simple listview. I need to fetch their names from a particular directory to adapter class. How can I do it?

If I do any changes to that particular file, these should be reflected in the listview.

解决方案

public class ReadAllFilesFromPathActivity extends Activity {
    /** Called when the activity is first created. */
    private List<String> myList;
    File file;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ListView listView = (ListView) findViewById(R.id.mylist);
        myList = new ArrayList<String>();

        File directory = Environment.getExternalStorageDirectory();
        file = new File( directory + "/Test" );
        File list[] = file.listFiles();

        for( int i=0; i< list.length; i++)
        {
                myList.add( list[i].getName() );
        }
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, android.R.id.text1, myList);
        listView.setAdapter(adapter); //Set all the file in the list.
    }
}

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