我的行包含一个按钮,该按钮在我的适配器的getView中设置了自己的单击侦听器。我可以使用行的父级中的android:descendantFocusability =“blocksDescendants”来区分我的按钮点击和实际的行项目点击。
当我点击一个按钮时,它正确地设置了按钮背景,我的问题是当我滚动列表时,它也为不同的行设置它。我认为他们的问题在哪里回收。
这是我的代码:
@Override
public View getView(int position, View convertView, ViewGroup parent){
if(convertView == null){
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.todays_sales_favorite_row, null);
holder.favCatBtn = (Button)convertView.findViewById(R.id.favCatBtn);
convertView.setTag(holder);
} else {
holder = (ViewHolder)convertView.getTag();
}
holder.favCatBtn.setTag(position);
holder.favCatBtn.setOnClickListener(this);
return convertView;
}
@Override
public void onClick(View v) {
int pos = (Integer) v.getTag();
Log.d(TAG, "Button row pos click: " + pos);
RelativeLayout rl = (RelativeLayout)v.getParent();
holder.favCatBtn = (Button)rl.getChildAt(0);
holder.favCatBtn.setBackgroundResource(R.drawable.icon_yellow_star_large);
}
因此,如果我点击第1行的按钮,按钮背景会发生变化。但是当我随机向下滚动列表时,其他按钮也会被设置。然后有时当我向上滚动到位置1时,按钮背景将再次恢复为原始状态。
我在这里缺少什么?我知道我就在那里它只是一些我不做的小事。
答案 0 :(得分:8)
是的,你是对的,意见被回收了。您需要跟踪已点击的位置,并使用getView
方法更新后台资源。例如,我扩展了代码以添加背景切换:
private final boolean[] mHighlightedPositions = new boolean[NUM_OF_ITEMS];
@Override
public View getView(int position, View convertView, ViewGroup parent){
if(convertView == null){
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.todays_sales_favorite_row, null);
holder.favCatBtn = (Button)convertView.findViewById(R.id.favCatBtn);
holder.favCatBtn.setOnClickListener(this);
convertView.setTag(holder);
}else {
holder = (ViewHolder)convertView.getTag();
}
holder.favCatBtn.setTag(position);
if(mHighlightedPositions[position]) {
holder.favCatBtn.setBackgroundResource(R.drawable.icon_yellow_star_large);
}else {
holder.favCatBtn.setBackgroundResource(0);
}
return convertView;
}
@Override
public void onClick(View view) {
int position = (Integer)view.getTag();
Log.d(TAG, "Button row pos click: " + position);
// Toggle background resource
RelativeLayout layout = (RelativeLayout)view.getParent();
Button button = (Button)layout.getChildAt(0);
if(mHighlightedPositions[position]) {
button.setBackgroundResource(0);
mHighlightedPositions[position] = false;
}else {
button.setBackgroundResource(R.drawable.icon_yellow_star_large);
mHighlightedPositions[position] = true;
}
}
答案 1 :(得分:0)
我使用StateListDrawable:
找到了一个完美,简洁的解决方案@Override
public View getView(final int position, View convertView, ViewGroup parent) {
currentPosition = position;
holder = null;
if (convertView == null) {
holder = new Holder();
LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.grid_item, null);
holder.imageView = (ImageView) convertView.findViewById(R.id.gridItemBtn);
StateListDrawable states = new StateListDrawable();
states.addState(new int[] {android.R.attr.state_pressed},
ContextCompat.getDrawable(context, R.drawable.pressed_state));
states.addState(new int[] {android.R.attr.state_focused},
ContextCompat.getDrawable(context, R.drawable.focused_state));
states.addState(new int[]{},
ContextCompat.getDrawable(context, R.drawable.default_state));
holder.imageView.setImageDrawable(states);
}
return convertView;
}
这与OnClickListener一起工作仍然很完美,你可以在那里做重要的事情。
答案 2 :(得分:-1)
holder.btnUnLock.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// Button btn = Button(v);
holder = (ViewHolder) v.getTag();
holder.btnSetLock.setBackgroundResource(R.drawable.btn_lock_bg_right);
holder.btnUnLock.setBackgroundResource(R.drawable.btn_unlock_bg_left);
}
});