在fragment中动态添加单选框时(参照的https://blog.csdn.net/shihuiyun/article/details/52935392), radiogroup.addView(button);报错Attempt to invoke virtual method 'void android.widget.RadioGroup.addView(android.view.View)' on a null object reference;我的定义radiobutton了啊
``` public void initViewTwo(){
RadioGroup radiogroup=(RadioGroup)getActivity().findViewById(R.id.gadiogroup);
addview(radiogroup);
}
public List<String> getListSize(){
List<String>list=new ArrayList<String>();
list.add("服装33333");
list.add("玩具44444");
list.add("饰品5555");
list.add("饰品6666");
list.add("文具7777");
list.add("文具8888");
list.add("文具9999");
return list;
}
//动态添加视图
public void addview(RadioGroup radiogroup){
int index=0;
for(String ss:getListSize()){
RadioButton button=new RadioButton(getActivity());
setRaidBtnAttribute(button,ss,index);
radiogroup.addView(button);
LinearLayout.LayoutParams layoutParams= (LinearLayout.LayoutParams) button
.getLayoutParams();
layoutParams.setMargins(0, 0, DensityUtil.dpToPx(getActivity(),10), 0);//4个参数按顺序分别是左上右下
button.setLayoutParams(layoutParams);
index++;
}
}
@SuppressLint("ResourceType")
private void setRaidBtnAttribute(final RadioButton codeBtn, String btnContent, int id ){
if( null == codeBtn ){
return;
}
// codeBtn.setBackgroundResource(R.drawable.radio_select);
codeBtn.setTextColor(this.getResources().getColorStateList(R.drawable.top_select));
codeBtn.setButtonDrawable(new ColorDrawable(Color.TRANSPARENT));
//codeBtn.setTextSize( ( textSize > 16 )?textSize:24 );
codeBtn.setId( id );
codeBtn.setText( btnContent );
//codeBtn.setPadding(2, 0, 2, 0);
codeBtn.setGravity( Gravity.CENTER );
codeBtn.setOnClickListener( new OnClickListener( ) {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(), codeBtn.getText().toString(), Toast.LENGTH_SHORT).show();
}
});
//DensityUtilHelps.Dp2Px(this,40)
LinearLayout.LayoutParams rlp = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT , DensityUtil.dpToPx(getActivity(),25) );
codeBtn.setLayoutParams( rlp );
}