RecyclerView添加项目，但替换初始项目
RecyclerView添加项目，但替换初始项目
提问于 2016-09-19 19:44:31
每次我从编辑文本中添加新值时，初始文本都会消失，最近添加的文本会发生appears.Why吗？这是我的适配器类。
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ItemHolder> {
private List<String> itemsName;
private OnItemClickListener onItemClickListener;
private LayoutInflater layoutInflater;
public RecyclerViewAdapter(Context context){
layoutInflater = LayoutInflater.from(context);
itemsName = new ArrayList<String>();
}
@Override
public RecyclerViewAdapter.ItemHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = layoutInflater.inflate(R.layout.text_view, parent, false);
return new ItemHolder(itemView, this);
}
@Override
public void onBindViewHolder(RecyclerViewAdapter.ItemHolder holder, int position) {
holder.setItemName(itemsName.get(position));
}
@Override
public int getItemCount() {
return itemsName.size();
}
public void setOnItemClickListener(OnItemClickListener listener){
onItemClickListener = listener;
}
public OnItemClickListener getOnItemClickListener(){
return onItemClickListener;
}
public interface OnItemClickListener{
public void onItemClick(ItemHolder item, int position);
}
public void add(int location, String iName){
itemsName.add(location, iName);
notifyItemInserted(location);
}
public static class ItemHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
private RecyclerViewAdapter parent;
TextView textItemName;
public ItemHolder(View itemView, RecyclerViewAdapter parent) {
super(itemView);
itemView.setOnClickListener(this);
this.parent = parent;
textItemName = (TextView) itemView.findViewById(R.id.textview);
}
public void setItemName(CharSequence name){
textItemName.setText(name);
}
public CharSequence getItemName(){
return textItemName.getText();
}
@Override
public void onClick(View v) {
final OnItemClickListener listener = parent.getOnItemClickListener();
if(listener != null){
listener.onItemClick(this, getPosition());
}
}
}}这是我在单击按钮时发送编辑文本字段值的活动。
btnsave =(Button) findViewById(R.id.btn_save);
btnsave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String newName = txtHeading.getText().toString();
Intent intent = new Intent(getApplicationContext(),BuilderPage.class);
intent.putExtra("key",newName);
startActivity(intent);
Toast.makeText(MyEditor
.this,"You added" +newName.toUpperCase()+ "in your view",Toast.LENGTH_LONG).show();
}
});这是需要在其中显示项目的Builder.Activity。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.builder_layout);
ButterKnife.bind(this);
setSupportActionBar(toolbar1);
getSupportActionBar().setDisplayShowTitleEnabled(false);
dbHelper = new DbHelper(this);
dbHelper.getWritableDatabase();
String nameList = getIntent().getStringExtra("key");
myRecyclerView = (RecyclerView)findViewById(R.id.recyclerView_builderxml);
linearLayoutManager = new
LinearLayoutManager(this, LinearLayoutManager.VERTICAL,false);
myRecyclerViewAdapter = new RecyclerViewAdapter(this);
myRecyclerViewAdapter.setOnItemClickListener(this);
myRecyclerView.setAdapter(myRecyclerViewAdapter);
myRecyclerView.setLayoutManager(linearLayoutManager);
myRecyclerViewAdapter.add(0,nameList);构建器的xml类为
<?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"
android:id="@+id/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView_builderxml"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:animateLayoutChanges="false"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
<android.support.design.widget.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar_builderxml"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways" >
<EditText
android:layout_width="350dp"
android:id="@+id/edittxtsurvey"
android:layout_height="wrap_content"
android:hint="Enter Your SurveyName"/>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<RelativeLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="bottom" >
<SlidingDrawer android:layout_width="wrap_content"
android:id="@+id/SlidingDrawer"
android:handle="@+id/slideHandleButton"
android:content="@+id/contentLayout"
android:padding="10dip"
android:layout_height="120dip">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/slideHandleButton"
android:src="@drawable/arrowdown">
</ImageView>
<RelativeLayout
android:layout_width="wrap_content"
android:background="#1a237e"
android:id="@+id/contentLayout"
android:gravity="center|top"
android:padding="10dip"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/plaintext"
android:id="@+id/imgviewplaintext"
android:padding="5dp"
android:onClick="oOnClick_PlainText"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/checkbox"
android:id="@+id/imgviewcheckbox"
android:onClick="OnClick_CheckBox"
android:padding="5dp"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/imgviewradiobutton"
android:layout_toStartOf="@+id/imgviewradiobutton"
android:layout_marginRight="21dp"
android:layout_marginEnd="21dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/radio"
android:id="@+id/imgviewradiobutton"
android:padding="5dp"
android:onClick="OnClick_RadioButton"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/imgviewtextbox"
android:layout_toStartOf="@+id/imgviewtextbox"
android:layout_marginRight="37dp"
android:layout_marginEnd="37dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/textbox"
android:id="@+id/imgviewtextbox"
android:onClick="onClick_textbox"
android:padding="5dp"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="30dp"
android:layout_marginEnd="30dp" />
</RelativeLayout>
</SlidingDrawer>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>回答 2
Stack Overflow用户
回答已采纳
发布于 2016-09-30 18:56:27
并不是您认为每次单击项目时都会创建新的实例，因此每次您看到新值或replaced.But时，您都需要保存您添加的数据，然后使用somewhere.You DataStorageOptionsInAndroid。因此，您可以选择任何选项来保存数据。
Stack Overflow用户
发布于 2016-09-19 20:25:50
您正在onCreate上创建和设置适配器。它将始终创建一个新实例。
myRecyclerView.setAdapter(myRecyclerViewAdapter);在此之后，应采用以下方式。
myRecyclerViewAdapter.add(0,nameList);
myRecyclerViewAdapter.add(1,nameList);
myRecyclerViewAdapter.add(2,nameList);
myRecyclerViewAdapter.add(3,nameList);试着改变你的逻辑。不要通过字符串传递名称列表。获取所有名称并将其发送到该活动，然后以字符串数组的形式获取这些值，或者从该活动本身获取所有名称。将该数组设置为回收器视图。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/39572384
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