假设我有一个元素的ListView,我想改变这个ListView中第一个元素的背景色,不是通过setOnItemClickListener,而是在ListView创建上。R.layout.fragment_manage, container, false);
listArrayAdapter = new ArrayAdapterjava.lang.NullPointerException: Attempt to in
我想用旋转器显示自定义对话框。奇怪的是,当我试图设置旋转器的适配器时,我得到了NullPointerException。dialog = new Dialog(this.getApplicationContext());
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this, android</e