Android 彻底征服 ListView 五 动态改变ListView布局

如果要动态地改变点击Item的布局来达到一个Focus的效果,有两种方法.
一种:将两种布局写在一起,通过控制布局的显示 隐藏,来达到切换布局的效果;
二种:在getView()的时候,通过判断来选择加载不同的布局.

public class FocusListViewAdapter extends BaseAdapter {

    private List<String> mData;
    private Context mContext;
    private int mCurrentItem = 0;

    public FocusListViewAdapter(Context context, List<String> data) {
        this.mContext = context;
        this.mData = data;
    }

    public int getCount() {
        return mData.size();
    }

    public Object getItem(int position) {
        return mData.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        LinearLayout layout = new LinearLayout(mContext);
        layout.setOrientation(LinearLayout.VERTICAL);
        if (mCurrentItem == position) {
            layout.addView(addFocusView(position));
        } else {
            layout.addView(addNormalView(position));
        }
        return layout;
    }

    public void setCurrentItem(int currentItem) {
        this.mCurrentItem = currentItem;
    }

    private View addFocusView(int i) {
        ImageView iv = new ImageView(mContext);
        iv.setImageResource(R.drawable.ic_launcher);
        return iv;
    }

    private View addNormalView(int i) {
        LinearLayout layout = new LinearLayout(mContext);
        layout.setOrientation(LinearLayout.HORIZONTAL);
        ImageView iv = new ImageView(mContext);
        iv.setImageResource(R.drawable.in_icon);
        layout.addView(iv, new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
        TextView tv = new TextView(mContext);
        tv.setText(mData.get(i));
        layout.addView(tv, new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
        layout.setGravity(Gravity.CENTER);
        return layout;
    }
}