Question

我在照片中制作了一个ui： Sketch

因此，当我点击gridView项目时，它会将其内容更改为小菜单。
接近这个的正确方法是什么？我的解决方案是2个布局，点击后膨胀项目，并使用：adapter.notifyDataSetChanged（）;
一直运行良好，直到你向下滚动（直到项目出现在视线之外）然后崩溃。

这是我的getView（）代码：

public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
RecordHolder holder = null;


Item item = data.get(position);
LayoutInflater inflater = ((Activity) context).getLayoutInflater();

if (row == null) {

    row = inflater.inflate(layoutResourceId, parent, false);
    holder = new RecordHolder();
    holder.txtTitle = (TextView) row.findViewById(R.id.item_text);
    holder.imageItem = (ImageView) row.findViewById(R.id.item_image);   
    row.setTag(holder);
}
else {
    holder = (RecordHolder) row.getTag();
}

if(item.showMenu == true && item.menuShown == false)
{
    item.menuShown = true;
    row = inflater.inflate(layoutResourceId_menu, parent, false);
    holder = new RecordHolder();
    holder.button1 = (Button) row.findViewById(R.id.button1);
    holder.button2 = (Button) row.findViewById(R.id.button2);
    row.setTag(holder);
}

if(item.showMenu == true && item.menuShown == true)
{
    holder.button1.setText("asdsad");
    holder.button2.setText("asdasdd");
}

if(item.showMenu == false && item.menuShown == true)
{
    row = inflater.inflate(layoutResourceId, parent, false);
    holder = new RecordHolder();
    holder.txtTitle = (TextView) row.findViewById(R.id.item_text);
    holder.imageItem = (ImageView) row.findViewById(R.id.item_image);
    row.setTag(holder);
    holder.txtTitle.setText(item.getTitle());
    holder.imageItem.setImageBitmap(item.getImage());
}
if(item.showMenu == false && item.menuShown == false)
{
    holder.txtTitle.setText(item.getTitle());
    holder.imageItem.setImageBitmap(item.getImage());
}
return row;

}

无论我尝试了什么，它都会一直崩溃。我这样做对吗？

更新这是logcat：

06-21 17:37:39.735    3308-3308/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.menu_grid_view_page, PID: 3308
java.lang.NullPointerException
        at com.example.menu_grid_view_page.CustomGridViewAdapter.getView(CustomGridViewAdapter.java:91)
        at android.widget.AbsListView.obtainView(AbsListView.java:2240)
        at android.widget.GridView.makeAndAddView(GridView.java:1345)
        at android.widget.GridView.makeRow(GridView.java:345)
        at android.widget.GridView.fillDown(GridView.java:287)
        at android.widget.GridView.fillGap(GridView.java:247)
        at android.widget.AbsListView.trackMotionScroll(AbsListView.java:5136)
        at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:4247)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
        at android.view.Choreographer.doCallbacks(Choreographer.java:574)
        at android.view.Choreographer.doFrame(Choreographer.java:543)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5081)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:781)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
        at dalvik.system.NativeStart.main(Native Method)

Answer 1

您正在充气两个视图并仅使用一个视图持有者。可能存在这样的情况：当row不为null但holder.txtTitle为null。代码内容：

if (row == null) {
..
} else {
..
}

尝试使用：

boolean inflated = false;
if (row != null) {
    holder = (RecordHolder) row.getTag();
    if (holder.imageItem != null) {
        inflated = true;
    }
}

if(!inflated) {
    row = inflater.inflate(layoutResourceId, parent, false);
    holder = new RecordHolder();
    holder.txtTitle = (TextView) row.findViewById(R.id.item_text);
    holder.imageItem = (ImageView) row.findViewById(R.id.item_image);   
    row.setTag(holder);
}

在Gridview项目上膨胀2个布局= CRASH :(

1 个答案: