学步园

问题：

EditText要求输入数字，点击之后，getview()这个方法再次被执行，软键盘从数字很快变成普通键盘，并且失去焦点。

原因：

软键盘弹出式，listview被重新绘制。

解决方法：

1. 重新绘制之前，记录下焦点位置；

2. 绘制完成之后，重新获取焦点；

栗子(项目中用到的)：

public class OrderTotalDetailListAdapter extends BaseAdapter {
	private ArrayList<OrderTotal> orderList = new ArrayList<OrderTotal>();
	
	public OrderTotalDetailListAdapter(int product_id) {
		orderList = OrderTotalDAO.getOrderTotalList(product_id);
	}

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

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

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

	@SuppressLint("InflateParams")
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		OrderTotal orderTotal = (OrderTotal) getItem(position);
		if (convertView == null) {
			LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
			convertView = inflater.inflate(R.layout.order_detail_4_sine_item, null);
		} 
		((OrderTotalDetailView)convertView).setValue(orderTotal, position);
		return convertView;
	}

}

public class OrderTotalDetailView extends LinearLayout {
	private EditText real_volume;
	private OrderTotal orderTotal;
	
	private int index = -1;

	public OrderTotalDetailView(Context context) {
		super(context);
	}

	public OrderTotalDetailView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}
	
	@SuppressLint("ClickableViewAccessibility")
	public void setValue(OrderTotal _orderTotal, final int position) {
		this.orderTotal = _orderTotal;
		if (real_volume == null) {
			real_volume = (EditText) findViewById(R.id.real_volume);
		}
		pop_name.setText(orderTotal.getPop());
		pred_volume.setText(orderTotal.getPred_volume() + "");
		real_volume.setText(orderTotal.getReal_volume()  + "");
		
		real_volume.setOnTouchListener(new OnTouchListener() { 
            @Override 
            public boolean onTouch(View v, MotionEvent event) { 
                if (event.getAction() == MotionEvent.ACTION_UP) { 
                	// 在TOUCH的UP事件中，要保存当前的行下标，因为弹出软键盘后，整个画面会被重画
                    // 在getView方法的最后，要根据index和当前的行下标手动为EditText设置焦点
                    index = position; 
                }
                return false; 
            } 
        });
		
		real_volume.addTextChangedListener(new TextWatcher() {
			
			private String preValue = "";
			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {
				if (preValue.equals(s.toString())) {
					return;
				}
				orderTotal.setReal_volume(Integer.parseInt(s.toString()));
				OrderTotalDAO.updateOrdersTotalVolume(orderTotal);
			}
			
			@Override
			public void beforeTextChanged(CharSequence s, int start, int count,
					int after) {
				preValue = s.toString();
			}
			
			@Override
			public void afterTextChanged(Editable s) {
				
			}
		});
		
		real_volume.clearFocus();
		// 如果当前的行下标和点击事件中保存的index一致，手动为EditText设置焦点。
        if(index!= -1 && index == position) {
        	real_volume.requestFocus();
        }
        // 焦点移到最后
        real_volume.setSelection(real_volume.getText().length());
	}
	
}

参考：

http://blog.csdn.net/l_serein/article/details/7517011

http://www.tuicool.com/articles/MNFFna