[android] ListView 选中状态的动态改变

ListView 选中状态时改变背景，可以标识当前选中的是哪一个元素，在继承 BaseAdapter 的类里实现。

1.MainActivity.java 里的相关代码：

private MyAdapter adapter = null ;list = (ListView) findViewById(R.id.listView1) ;//获取ListViewadapter = new MyAdapter(MainActivity.this) ;list.setAdapter(adapter) ;list.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) {PlayMusicByNum(position) ;adapter.setSelectItem(position) ;adapter.notifyDataSetInvalidated() ;}}) ;

2.MyAdapter.java

package com.audioplayer.dao;import android.content.Context;import android.graphics.Color;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.audioplayer.bean.Music;import com.example.audioplayer.R;public class MyAdapter extends BaseAdapter {private int selectItem = -1 ;//选中的Itemprivate LayoutInflater myInflater ;MyAdapter(Context c) {myInflater = LayoutInflater.from(c) ;}@Overridepublic int getCount() {return MainActivity.musicList.size() ;}@Overridepublic Object getItem(int position) {return MainActivity.musicList.get(position).getTitle() ;}@Overridepublic long getItemId(int position) {return position ;}@Overridepublic View getView(int position, View convertView, ViewGroup Groupparent) {convertView = myInflater.inflate(R.layout.another_layout, null) ;ImageView imgLogo = (ImageView) convertView.findViewById(R.id.imageView1) ;TextView txtName = (TextView) convertView.findViewById(R.id.name) ;TextView txtArtist = (TextView) convertView.findViewById(R.id.artist) ;TextView txtDuration = (TextView) convertView.findViewById(R.id.duration) ;Music music = MainActivity.musicList.get(position) ;imgLogo.setImageResource(R.drawable.music) ;txtName.setText(music.getTitle()) ;txtArtist.setText(music.getArtist()) ;txtDuration.setText( timeParse(music.getDuration()) ) ;if(position == selectItem){convertView.setBackgroundColor(Color.CYAN) ;}else{convertView.setBackgroundColor(Color.TRANSPARENT) ;}return convertView ;}public void setSelectItem(int selectItem) {this.selectItem = selectItem ;}public static String timeParse(long duration) {//将毫秒数时间转化为“03:50”形式String time = "" ;long minute = duration / 60000 ;long seconds = duration % 60000 ;long second = Math.round((float)seconds/1000) ;if( minute < 10 ){time += "0" ;}time += minute+":" ; if( second < 10 ){time += "0" ;}time += second ;return time ;}}

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