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點擊添加按鈕後，它只顯示第一項。但是當我觸摸編輯文本字段時，剩餘的項目會顯示並消失。爲什麼Recylerview無法正確顯示數據？
這裏是在MainActivity：
package com.example.mysecondapp.myapplication;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
EditText editText;
Button add,ins;
ArrayList<item> list;
Adapter adpter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ins= (Button) findViewById(R.id.button1);
add= (Button) findViewById(R.id.button2);
editText= (EditText) findViewById(R.id.editText2);
recyclerView= (RecyclerView) findViewById(R.id.recycler);
list=new ArrayList<item>();
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setItemAnimator(new DefaultItemAnimator());
adpter =new Adapter(new ArrayList<item>());
recyclerView.setAdapter(adpter);
ins.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String str=editText.getText().toString();
InputMethodManager inputMethodManager= (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(),0);
editText.setText(" ");
Toast.makeText(getBaseContext(),"Added to list",Toast.LENGTH_SHORT).show();
item i=new item(str);
list.add(i);
}
});
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
adpter.adplist=list;
Toast.makeText(getBaseContext(),"Adding to Recycler View",Toast.LENGTH_SHORT).show();
adpter.notifyDataSetChanged();
}
});
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
這裏是適配器
package com.example.mysecondapp.myapplication;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
public class Adapter extends RecyclerView.Adapter<Adapter.MyHolder> {
ArrayList<item> adplist;
public ArrayList<item> getAdplist() {
return adplist;
}
public void setAdplist(ArrayList<item> adplist) {
this.adplist = adplist;
}
public Adapter(ArrayList<item>list) {
adplist=new ArrayList<item>();
adplist=list;
}
@Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.item,parent,false);
return new MyHolder(v);
}
@Override
public void onBindViewHolder(MyHolder holder, int position) {
item i=adplist.get(position);
holder.tv.setText(i.getStr());
}
@Override
public int getItemCount() {
return adplist.size();
}
public class MyHolder extends RecyclerView.ViewHolder{
TextView tv;
public MyHolder(View itemView) {
super(itemView);
tv=itemView.findViewById(R.id.item_text_view);
}
}
}
這裏是項目
package com.example.mysecondapp.myapplication;
public class item {
String str;
public item(String str) {
this.str = str;
}
public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
}
下面是活動的xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.mysecondapp.myapplication.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main"/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
app:srcCompat="@android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
下面是內容的XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_main"
tools:context="com.example.mysecondapp.myapplication.MainActivity">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:id="@+id/editText2"
android:layout_weight="1" />
<Button
android:text="INSERT"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:id="@+id/button1"
android:layout_weight="2" />
<Button
android:text="ADD"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:id="@+id/button2"
android:layout_weight="2" />
</LinearLayout>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="60dp"/>
</RelativeLayout>
和項目的xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/item_text_view"/>
</LinearLayout>
有什麼不好的代碼？
在此先感謝
你想說的話，你可以請解釋一點 –
回收站視圖僅僅只顯示做什麼它的數據集中的第一項。剩餘項目不顯示。 –