Android ListView常用小技巧汇总

** 类似聊天界面，ListView中有多种item样式效果

//实现ListView中多种item样式
public class TypeActivity extends Activity {
  private ListView type_lv;
  private List<TestBean> dataList;
  private TypeAdapter adapter;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_type);
    initDatas();
    initViews();

  }

  private void initDatas() {
    dataList = new ArrayList<>();
    for (int i = 0; i < 9; i++) {
      TestBean bean = new TestBean();
      bean.setTitle("标题_" + i);
      bean.setContent("这是内容_" + i);
      bean.setType(i % 2 == 0 ? 1 : 2);
      dataList.add(bean);
    }
  }

  private void initViews() {
    this.type_lv = (ListView) findViewById(R.id.type_lv);
    adapter = new TypeAdapter(this, dataList);
    type_lv.setAdapter(adapter);

  }
}
//对应Adapter
public class TypeAdapter extends BaseAdapter {
  private Context mContext;
  private List<TestBean> listDatas;

  public TypeAdapter(Context mContext, List<TestBean> listDatas) {
    this.mContext = mContext;
    this.listDatas = listDatas;
  }

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

  @Override
  public Object getItem(int position) {
    return listDatas.get(position);
  }

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

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;
    //根据样式设置不同的布局及数据展示
    int type = getItemViewType(position);
    if (convertView == null) {
      holder = new ViewHolder();
      if (type == 1) {
        convertView = LayoutInflater.from(mContext).inflate(R.layout.test_item, null);
        holder.title = (TextView) convertView.findViewById(R.id.item_title);
        holder.content = (TextView) convertView.findViewById(R.id.item_content);
      } else {
        convertView = LayoutInflater.from(mContext).inflate(R.layout.type_item, null);
        holder.title = (TextView) convertView.findViewById(R.id.type_title);
        holder.content = (TextView) convertView.findViewById(R.id.type_title);
      }
      convertView.setTag(holder);
    } else {
      holder = (ViewHolder) convertView.getTag();
    }
    holder.content.setText(listDatas.get(position).getContent());
    holder.title.setText(listDatas.get(position).getTitle());
    return convertView;
  }
//关键方法之getViewTypeCount：获取有多少种样式
  @Override
  public int getViewTypeCount() {
    return 2;
  }
//关键方法之getItemViewType：获取item类型
  @Override
  public int getItemViewType(int position) {
    return listDatas.get(position).getType();
  }

  final class ViewHolder {
    TextView title;
    TextView content;
  }
}

								 
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