ListView具有多种item布局

Android使用的BaseAdapter提供了解决多种布局文件的重用方法。

1）重写 getViewTypeCount() – 该方法返回多少个不同的布局
2）重写 getItemViewType(int) – 根据position返回相应的Item

[java] view plain copy print?
/**
* 比原来的多了getItemViewType和getViewTypeCount这两个方法，
*
* */
public class ChatAdapter extends BaseAdapter {

public static final String KEY = "key";
public static final String VALUE = "value";

public static final int VALUE_TIME_TIP = 0;// 7种不同的布局
public static final int VALUE_LEFT_TEXT = 1;
public static final int VALUE_LEFT_IMAGE = 2;
public static final int VALUE_LEFT_AUDIO = 3;
public static final int VALUE_RIGHT_TEXT = 4;
public static final int VALUE_RIGHT_IMAGE = 5;
public static final int VALUE_RIGHT_AUDIO = 6;
private LayoutInflater mInflater;

private List myList;

public ChatAdapter(Context context, List myList) {
this.myList = myList;

mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
return myList.size();
}

@Override
public Object getItem(int arg0) {
return myList.get(arg0);
}

@Override
public long getItemId(int arg0) {
return arg0;
}

@Override
public View getView(int position, View convertView, ViewGroup arg2) {

Message msg = myList.get(position);
int type = getItemViewType(position);
ViewHolderTime holderTime = null;
ViewHolderRightText holderRightText = null;
ViewHolderRightImg holderRightImg = null;
ViewHolderRightAudio holderRightAudio = null;
ViewHolderLeftText holderLeftText = null;
ViewHolderLeftImg holderLeftImg = null;
ViewHolderLeftAudio holderLeftAudio = null;

if (convertView == null) {
switch (type) {
case VALUE_TIME_TIP:
holderTime = new ViewHolderTime();
convertView = mInflater.inflate(R.layout.list_item_time_tip,
null);
holderTime.tvTimeTip = (TextView) convertView
.findViewById(R.id.tv_time_tip);
holderTime.tvTimeTip.setText(msg.getValue());
convertView.setTag(holderTime);
break;
// 左边
case VALUE_LEFT_TEXT:
holderLeftText = new ViewHolderLeftText();
convertView = mInflater.inflate(R.layout.list_item_left_text,
null);
holderLeftText.ivLeftIcon = (ImageView) convertView
.findViewById(R.id.iv_icon);
holderLeftText.btnLeftText = (Button) convertView
.findViewById(R.id.btn_left_text);
holderLeftText.btnLeftText.setText(msg.getValue());
convertView.setTag(holderLeftText);
break;

case VALUE_LEFT_IMAGE:
holderLeftImg = new ViewHolderLeftImg();
convertView = mInflater.inflate(R.layout.list_item_left_iamge,
null);
holderLeftImg.ivLeftIcon = (ImageView) convertView
.findViewById(R.id.iv_icon);
holderLeftImg.ivLeftImage = (ImageView) convertView
.findViewById(R.id.iv_left_image);
holderLeftImg.ivLeftImage.setImageResource(R.drawable.test);
convertView.setTag(holderLeftImg);
break;

case VALUE_LEFT_AUDIO:
holderLeftAudio = new ViewHolderLeftAudio();
convertView = mInflater.inflate(R.layout.list_item_left_audio,
null);
holderLeftAudio.ivLeftIcon = (ImageView) convertView
.findViewById(R.id.iv_icon);
holderLeftAudio.btnLeftAudio = (Button) convertView
.findViewById(R.id.btn_left_audio);
holderLeftAudio.tvLeftAudioTime = (TextView) convertView
.findViewById(R.id.tv_left_audio_time);
holderLeftAudio.tvLeftAudioTime.setText(msg.getValue());
convertView.setTag(holderLeftAudio);
break;
// 右边
case VALUE_RIGHT_TEXT:
holderRightText= new ViewHolderRightText();
convertView = mInflater.inflate(R.layout.list_item_right_text,
null);
holderRightText.ivRightIcon = (ImageView) convertView
.findViewById(R.id.iv_icon);
holderRightText.btnRightText = (Button) convertView
.findViewById(R.id.btn_right_text);
holderRightText.btnRightText.setText(msg.getValue());
convertView.setTag(holderRightText);
break;

case VALUE_RIGHT_IMAGE:
holderRightImg= new ViewHolderRightImg();
convertView = mInflater.inflate(R.layout.list_item_right_iamge,
null);
holderRightImg.ivRightIcon = (ImageView) convertView
.findViewById(R.id.iv_icon);
holderRightImg.ivRightImage = (ImageView) convertView
.findViewById(R.id.iv_right_image);
holderRightImg.ivRightImage.setImageResource(R.drawable.test);
convertView.setTag(holderRightImg);
break;

case VALUE_RIGHT_AUDIO:
holderRightAudio=new ViewHolderRightAudio();
convertView = mInflater.inflate(R.layout.list_item_right_audio,
null);
holderRightAudio.ivRightIcon = (ImageView) convertView
.findViewById(R.id.iv_icon);
holderRightAudio.btnRightAudio = (Button) convertView
.findViewById(R.id.btn_right_audio);
holderRightAudio.tvRightAudioTime = (TextView) convertView
.findViewById(R.id.tv_right_audio_time);
holderRightAudio.tvRightAudioTime.setText(msg.getValue());
convertView.setTag(holderRightAudio);
break;

default:
break;
}

} else {
Log.d("baseAdapter", "Adapter_:"+(convertView == null) );
switch (type) {
case VALUE_TIME_TIP:
holderTime=(ViewHolderTime)convertView.getTag();
holderTime.tvTimeTip.setText(msg.getValue());
break;
case VALUE_LEFT_TEXT:
holderLeftText=(ViewHolderLeftText)convertView.getTag();
holderLeftText.btnLeftText.setText(msg.getValue());
break;
case VALUE_LEFT_IMAGE:
holderLeftImg=(ViewHolderLeftImg)convertView.getTag();
holderLeftImg.ivLeftImage.setImageResource(R.drawable.test);
break;
case VALUE_LEFT_AUDIO:
holderLeftAudio=(ViewHolderLeftAudio)convertView.getTag();
holderLeftAudio.tvLeftAudioTime.setText(msg.getValue());
break;
case VALUE_RIGHT_TEXT:
holderRightText=(ViewHolderRightText)convertView.getTag();
holderRightText.btnRightText.setText(msg.getValue());
break;
case VALUE_RIGHT_IMAGE:
holderRightImg=(ViewHolderRightImg)convertView.getTag();
holderRightImg.ivRightImage.setImageResource(R.drawable.test);
break;
case VALUE_RIGHT_AUDIO:
holderRightAudio=(ViewHolderRightAudio)convertView.getTag();
holderRightAudio.tvRightAudioTime.setText(msg.getValue());
break;

default:
break;
}

//holder = (ViewHolder) convertView.getTag();
}
return convertView;
}