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[英]How to open new activity in recyclerview with firebase database
[英]Open new activity from Recyclerview containing cards
有一个看似简单的任务-
使用回收站视图显示项目列表,每个项目应为卡片视图。单击任何项目时,应打开一个新屏幕,其中将显示该项目的详细信息。
我已经见过关于同一主题的各种问题, 我将为我所做的尝试提供一些帮助,而不是将我重定向到那里,因为我很新,并且无法仅通过查看这些答案就无法确切理解如何实现。试图严格按照教程进行操作,但是显然无法复制结果。
MainActivity.java
. package com.example.hardikvats.recylerviewdemo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private String[] phones={"MotoX","Nokia Asha","Lumia 710","Iphone 7s"};
private String[] OperatingSytem={"Android","Symbian","Windows","Ios"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
RecyclerView recyclerView= (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setItemAnimator(new DefaultItemAnimator());
MyAdapter adapter=new MyAdapter(this,phones);
recyclerView.setAdapter(adapter);
}
}
MyAdapter.java
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Hardik Vats on 20-Jan-17.
*/
public class MyAdapter extends RecyclerView.Adapter<MyHolder> {
Context c;
String[] phones;
String[] OperatingSystem;
//CONSTRUCTOR
public MyAdapter(Context c, String[] PhoneModel){
this.c=c;
this.phones=PhoneModel;
//this.OperatingSystem=OperatingSystem;
}
@Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//INFLATING FROM XML TO JAVA VIEW
View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.model,null);
MyHolder holder=new MyHolder(v);
return holder;
}
@Override
public void onBindViewHolder(MyHolder holder, int position) {
holder.PhoneModel.setText(phones[position]);
holder.setItemClickListner(new ItemClickListner() {
@Override
public void onItemClick(View v, int position) {
Intent i=new Intent(c,DetailActivity.class);
i.putExtra("OS name",OperatingSystem[position]);
}
});
}
@Override
public int getItemCount() {
return phones.length;
}
}
MyHolder.java
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
/**
* Created by Hardik Vats on 20-Jan-17.
*/
public class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView PhoneModel;
ItemClickListner icl;
public MyHolder(View itemView) {
super(itemView);
PhoneModel=(TextView) itemView.findViewById(R.id.MobilePhone);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
this.icl.onItemClick(v,getLayoutPosition());
}
public void setItemClickListner(ItemClickListner itemClickListner){
this.icl=itemClickListner;
}
}
DetailActivity.java
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
public class DetailActivity extends AppCompatActivity {
TextView OperatingSystem;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail2);
Intent i=getIntent();
final String OperatingSystem =i.getExtras().getString("Operating System");
}
}
ItemClickListner.java(接口)
`import android.view.View;
/**
* Created by Hardik Vats on 20-Jan-17.
*/
public interface ItemClickListner {
void onItemClick(View v, int position);
}`
目的是单击电话阵列中的每个列表项,并获得一个在新文本字段的新活动中列出操作系统的活动。
在i.putExtra(“ OS NAME ....之后,添加此行
c.startActivity(c,DetailActivity.class);
如您所做的,为了使更改很小,请尝试以下操作:
holder.PhoneModel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(c,DetailActivity.class);
i.putExtra("OS name",OperatingSystem[holder.getAdapterPosition()]);
}
});
持有人将始终保持您的位置。
//set on item click listener like this
mRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener(this, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(MainActivity.this, "Card at " + position + " is clicked", Toast.LENGTH_SHORT).show();
// here you can start your detail Activity
Intent i=new Intent(c,DetailActivity.class);
i.putExtra("OS name",OperatingSystem[position]);
c.startActivity(i);
}
}));
// here is the on item click listener class
public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
private OnItemClickListener mListener;
GestureDetector mGestureDetector;
public interface OnItemClickListener{
public void onItemClick(View view, int position);
}
public RecyclerItemClickListener(Context context, OnItemClickListener listener) {
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View childView = rv.findChildViewUnder(e.getX(),e.getY());
if(childView != null && mListener != null && mGestureDetector.onTouchEvent(e)){
mListener.onItemClick(childView, rv.getChildAdapterPosition(childView));
return true;
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
@Override`enter code here`
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
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