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爲什麼我的Recycler視圖選擇錯誤的項目以及精確選定的被點擊的項目？ Image To Show Recycler View Problem爲什麼我的Recycler視圖選擇了錯誤的項目以及精確選定的被點擊的項目？
我想將RecyclerView放置在單擊事件啓動的彈出式活動中，並且RecycleView應該從視圖中更改所選項目的背景。我用下面的代碼活動，使其彈出
拉網活動代碼
DisplayMetrics metrics=new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
float width=metrics.widthPixels*8/10;
float height=metrics.heightPixels*6/10;
getWindow().setLayout((int)width, (int) height);
代碼爲我的回收站查看適配器如下
public class PopUp extends Activity {
public int counter=0;
private int mItemSelected=-1;
public List<student> students=new ArrayList<student>();
public RecyclerView recyclerView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//to set content view for that activity
setContentView(R.layout.popup);
//end of the setting the layout for the activity
//this is mechanism to calculate the width and height of the screen
DisplayMetrics metrics=new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
float width=metrics.widthPixels*8/10;
float height=metrics.heightPixels*6/10;
getWindow().setLayout((int)width, (int) height);
//end of the mechanism
//the method to populate the list
populateList();
//end of the method
//now creating the recycler view
recyclerView=(RecyclerView) findViewById(R.id.my_recycler_view);
recyclerView.setHasFixedSize(true);
// use a linear layout manager
LinearLayoutManager mLayoutManager = new
LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
recyclerView.setLayoutManager(mLayoutManager);
MyAdapter adapter=new MyAdapter(students);
recyclerView.setAdapter(adapter);
//end of the recycler view
}
//this is event for the ok button
public void Ok(View view){
}
//end of the ok button for the pop activity
//this is event for the button named as cancel
public void Cancel(View view){
}
//end of the cancel button event
//this is method for printing line
public void PrintLine(String line){
Toast.makeText(getApplicationContext(),line,Toast.LENGTH_SHORT).show();
}
//end of the method
//this method to populate the ArrayList
public void populateList(){
String name="Mashhood Qadeer Bhatti";
String address="Sammundri Faisalabad";
boolean status=false;
for(int i=0; i<10; i++){
students.add(new student(name+"\t"+i,address,status));
}
}
//end of the method
//this is section for recycler adapter
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<student> values;
//this is constructor
public MyAdapter(List<student> myDataset) {
values = myDataset;
}
//end of the constructor
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(
parent.getContext());
View v = inflater.inflate(R.layout.row_layout, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.name.setText(values.get(position).getName().toString());
holder.address.setText(values.get(position).getAddress().toString());
holder.status.setSelected(values.get(position).getSelction());
holder.name.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(mItemSelected==position){
v.setBackground(getResources().getDrawable(R.drawable.im));
PrintLine("The position matched"+position);
values.get(position).setSelction(!values.get(position).getSelction());
holder.status.setChecked(values.get(position).getSelction());
}
}
});
}
@Override
public int getItemCount() {
return values.size();
}
//there will be view holder
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView name;
public TextView address;
public View layout;
public RadioButton status;
public ViewHolder(View v) {
super(v);
layout = v;
name = (TextView) v.findViewById(R.id.name);
address = (TextView) v.findViewById(R.id.address);
status=(RadioButton) v.findViewById(R.id.status);
layout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
notifyDataSetChanged();
mItemSelected=getAdapterPosition();
}
});
/* v.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mItemSelected=getAdapterPosition();
PrintLine("This is position for the"+getAdapterPosition());
notifyDataSetChanged();
values.get(mItemSelected).setSelction(!values.get(mItemSelected).getSelction());
}
});*/
}
}
//end of the view holder
}
//end of that section
}
用戶holder.getAdapterPosition（），而不是位置。 –
先生原諒我，因爲我處於學習的早期階段而寫錯了任何東西。我使用持有者來獲取我的ui小部件，例如我的ViewAdapter中有一個名爲狀態的單選按鈕，所以我想將收音機設置爲作爲檢查點擊時，這就是爲什麼我使用holder.status.setSelected（）;然後爲其提供反轉布爾值，僅用於切換功能以顯示被選中或未選中。先生！如果使用holder.getAdapterPosition（）它會給我適配器的id然後如何改變它的背景。 – Mashhood
持有者給我們的兩個位置是onBindViewHolderMethod中的int位置，它是可見屏幕上的位置。另一個是holder.getAdapterPosition（），它是該項目的實際位置。所以我建議你使用第二個。 –