【发布时间】：2018-06-01 15:56:45
【问题描述】：
我创建了一个 firebase 搜索查询，它运行良好。但现在我似乎无法弄清楚如何进行 onlick 并获取项目位置。以下是我的 Firebase 搜索活动：
mUserDatabase=FirebaseDatabase.getInstance().getReference("Users").child("UserProfile";
mSearchField = findViewById(R.id.search_field);
mSearchBtn = findViewById(R.id.search_btn);
mResultList = findViewById(R.id.result_list);
mResultList.setHasFixedSize(true);
mResultList.setLayoutManager(new LinearLayoutManager(this));
mSearchBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String searchText = mSearchField.getText().toString();
firebaseUserSearch(searchText);
}
});
}
private void firebaseUserSearch(String searchText) {
Toast.makeText(SearchActivity.this, "Searching......", Toast.LENGTH_LONG).show();
Query firebaseSearchQuery = mUserDatabase.orderByChild("profession").startAt(searchText).endAt(searchText + "\uf8ff");
FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(
Users.class,
R.layout.search_list_layout,
UsersViewHolder.class,
firebaseSearchQuery
) {
@Override
protected void populateViewHolder(UsersViewHolder viewHolder, Users model, int position) {
viewHolder.setDetails(getApplicationContext(), model.getUsername(), model.getSummary(), model.getImageurl());
}
};
mResultList.setAdapter(firebaseRecyclerAdapter);
}
public static class UsersViewHolder extends RecyclerView.ViewHolder {
View mView;
private TextView user_name;
private TextView user_summary;
private ImageView user_image;
public UsersViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setDetails(Context ctx, String userName,String userSummary,String userImage){
user_name = mView.findViewById(R.id.name_text);
user_summary = mView.findViewById(R.id.summary_text);
user_image = mView.findViewById(R.id.profile_image);
user_name.setText(userName);
user_summary.setText(userSummary);
Glide.with(ctx).load(userImage).into(user_image);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = getAdapterPosition();
Snackbar.make(v, "Hello,How may i help you", Snackbar.LENGTH_LONG).setAction("Action", null).show();
}
});
}
当单击搜索结果中的单个项目时，我如何在详细信息活动中显示内容。
根据Parag Pawar的建议，我尝试了以下方法，但没有成功>
@Override
protected void populateViewHolder(UsersViewHolder viewHolder, Users model, int position) {
viewHolder.setDetails(getApplicationContext(), model.getUsername(), model.getSummary(), model.getImageurl());
final String each_key = getRef(position).getKey();
}
};
然后在我的 UserViewHolder 中我初始化了 onclick：
mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent pDetail = new Intent(SearchActivity.this, ProfileDetail.class);
Users each_key = each_key.get(getAdapterPosition());
pDetail.putExtra(ProfileDetail.EXTRA_POSITION, each_key.getUserId());
startActivity(pDetail);
}
});
但我收到错误可能没有初始化变量 each_key
根据 Parag Pawar 的顶级建议修复了我的错误，并在 populateView`holder 中实现了他的 onclick，如下所示：
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
/*Here use intent.putExtra() to send each_key on other activity and fetch data there*/
Toast.makeText(SearchActivity.this, "u clicked......" +position, Toast.LENGTH_LONG).show();
Intent each_key = new Intent(SearchActivity.this, ProfileDetail.class);
Users user = mResultList.get(position);
each_key.putExtra(ProfileDetail.EXTRA_POSITION, user.getUserId());
startActivity(each_key);
} });
但我在这里收到错误：
Users user = mResultList.get(position);
无法解析方法“get(int)”
mReultList 是我的 Recyclerview 的名称，我将其初始化如下：
private RecyclerView mResultList;
但我不知道我这样做是否正确。我知道我应该将结果附加到适配器，但我不知道该怎么做。所以我尝试了：
listItems = new ArrayList<>();
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<UsersList>(listItems,this);
但这似乎也不起作用
更新代码
我创建了一个数组：
private List<UsersList> listItems;//UsersList is my modal class
然后将其添加到我的 onCreate 中：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
listItems = new ArrayList<>();
然后我使用这个数组如下实现了putExtra：
Intent each_key = new Intent(TestSearch.this, ProfileDetail.class);
UsersList user = listItems.get(position);
//Here use intent.putExtra() to send each_key on other activity and fetch data there
Toast.makeText(TestSearch.this, "u clicked......" +position, Toast.LENGTH_LONG).show();
each_key.putExtra(ProfileDetail.EXTRA_POSITION, user.getUserId());
startActivity(each_key);
但是当我点击一个项目时出现这个错误：
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.get(ArrayList.java:411)
at com.ecard.ecard.search.TestSearch$2$1.onClick(TestSearch.java:94)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
【问题讨论】：
标签： java android firebase firebase-realtime-database