在RecyclerView项目中替换片段
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在我的RecyclerView中，我需要将部分项目替换为我的片段。但只替换回收站视图中的第一项。我在做什么是错的？
我的容器（在回收商视图项目中）：
...
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/container" />
...
我在RecyclerView适配器中的更新代码：
...
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
...
MyFragment fragment = MyFragment.newInstance("fragment1");
fragmentManager.beginTransaction().replace(R.id.container, fragment).commit();
...
}
...
答案
我终于找到了解决方案问题是我设置了一个普通的容器ID。但是在recyclerview中需要为每个项目设置唯一的容器ID。
所以，我的代码现在这样：
MyFragment fragment = MyFragment.newInstance("fragment1");
fragmentManager.beginTransaction().replace(unique_id_here, fragment).commit();
如果有人会有用，这是我的完整代码（recyclerview中的实现片段）：
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
...
// Delete old fragment
int containerId = holder.mediaContainer.getId();// Get container id
Fragment oldFragment = fragmentManager.findFragmentById(containerId);
if(oldFragment != null) {
fragmentManager.beginTransaction().remove(oldFragment).commit();
}
int newContainerId = GetUniqueID();// My method
holder.mediaContainer.setId(newContainerId);// Set container id
// Add new fragment
MyFragment fragment = MyFragment.newInstance("fragment1");
fragmentManager.beginTransaction().replace(newContainerId, fragment).commit();
...
}
另一答案
感谢Mikhali，我能够为您提供一个完整的运行示例。特别注意onBindViewHolder（）中的注释
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewLedgerAdapter.ViewHolder>{
private final String TAG = RecyclerViewAdapter.class.getSimpleName();
private final float FINAL_OPACITY = 0.3f;
private final float START_OPACITY = 1f;
private final int ANIMATION_TIME = 500;
private final int TYPE_ITEM = 0;
private final int TYPE_DATE = 1;
private final int TYPE_TRANSACTION = 2;
private final int TYPE_PENDING = 3;
private HashMap<Integer, Integer> mElementTypes;
private List<Operation> mObjects;
private Context mContext;
private Utils.CURRENCIES mCurrencySelected; // Which currency is already selected
private boolean mCurrencyFilter; // Defines if a currency is already selected to apply filter
private Animation mAnimationUp;
private Animation mAnimationDown;
public RecyclerViewLedgerAdapter(List<Operation> objects, Context context) {
mElementTypes = new HashMap<Integer, Integer>();
mObjects = objects;
mContext = context;
mCurrencyFilter = false;
mCurrencySelected = null;
mAnimationUp = AnimationUtils.loadAnimation(context, R.anim.slide_up);
mAnimationDown = AnimationUtils.loadAnimation(context, R.anim.slide_down);
}
...
...
Not needed methods
...
...
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.rv_element_ledger, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
Operation operation = mObjects.get(position);
holder.setAppUserActivity(userActivityOperation);
// Remember that RecyclerView does not have onClickListener, you should implement it
holder.getView().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Hide details
// iDetailsContainer object could be checked on inner class ViewHolder
if(holder.iDetailsContainer.isShown()){
holder.iDetailsContainer.setVisibility(View.GONE);
}else{
// Show details
// Get fragment manager inside our fragment
FragmentManager fragmentManager = ((UserActivity)mContext).getSupportFragmentManager();
// Delete previous added fragment
int currentContainerId = holder.iDetailsContainer.getId();
// Get the current fragment
Fragment oldFragment = fragmentManager.findFragmentById(currentContainerId);
if(oldFragment != null) {
// Delete fragmet from ui, do not forget commit() otherwise no action
// is going to be observed
ragmentManager.beginTransaction().remove(oldFragment).commit();
}
// In order to be able of replacing a fragment on a recycler view
// the target container should always have a different id ALWAYS
int newContainerId = getUniqueId();
// Set the new Id to our know fragment container
holder.iDetailsContainer.setId(newContainerId);
// Just for Testing we are going to create a new fragment according
// if the view position is pair one fragment type is created, if not
// a different one is used
Fragment f;
if(position%2 == 0) {
f = new FragmentCard();
}else{
f=new FragmentChat();
}
// Then just replace the recycler view fragment as usually
manager.beginTransaction().replace(newContainerId, f).commit();
// Once all fragment replacement is done we can show the hidden container
holder.iDetailsContainer.setVisibility(View.VISIBLE);
}
}
// Method that could us an unique id
public int getUniqueId(){
return (int)SystemClock.currentThreadTimeMillis();
}
});
}
public class ViewHolder extends RecyclerView.ViewHolder{
private View iView;
private LinearLayout iContainer;
public LinearLayout iDetailsContainer;
private ImageView iOperationIcon;
private ImageView iOperationActionImage;
private TextView iOperation;
private TextView iAmount;
private TextView iTimestamp;
private TextView iStatus;
private UserActivityOperation mUserActivityOperation;
public ViewHolder(View itemView) {
super(itemView);
iView = itemView;
iContainer = (LinearLayout) iView.findViewById(R.id.operation_container);
iDetailsContainer = (LinearLayout) iView.findViewById(R.id.details_container);
iOperationIcon = (ImageView) iView.findViewById(R.id.ledgerOperationIcon);
iOperationActionImage = (ImageView) iView.findViewById(R.id.ledgerAction);
iOperation = (TextView) iView.findViewById(R.id.ledgerOperationDescription);
iAmount = (TextView) iView.findViewById(R.id.ledgerOperationCurrencyAmount);
iTimestamp = (TextView) iView.findViewById(R.id.ledgerOperationTimestamp);
iStatus = (TextView) iView.findViewById(R.id.ledgerOperationStatus);
// This linear layout status is GONE in order to avoid the view to use space
// even when it is not seen, when any element selected the Adapter will manage the
// behavior for showing the layout - container
iDetailsContainer.setVisibility(View.GONE);
}
...
...
Not needed methods
...
...
}
}
布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/operation_container_maximum"
android:layout_width="match_parent"
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