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が、私はまだJavaとの両方を持つ新たなんだアンドロイドRecycleView文句を言わない更新
私の問題はrecycleviewのみ更新さという点であると私はアプリを閉じて、もう一度それを実行した場合、新たな付加されたタグを追加します。新しいタグを表示するために、アプリケーションにリサイクルビューを直ちに更新させるにはどうすればよいですか？
Javaコード
package com.deitel.favoritesites;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.preference.DialogPreference;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.TextInputLayout;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.Adapter;
import android.widget.EditText;
import android.widget.TextView;
import android.view.Menu;
import android.view.MenuItem;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final String SITES="Sites";
private EditText urlEditText; //where user enters the URL
private EditText tagEditText;
private FloatingActionButton saveFloatingActionButton;
private SharedPreferences savedSites;
private List<String> tags;
private SitesAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
urlEditText = ((TextInputLayout) findViewById(
R.id.URLTextInputLayout)).getEditText();
urlEditText.addTextChangedListener(textWatcher);
tagEditText=((TextInputLayout)findViewById(R.id.tagTextInputLayout)).getEditText();
tagEditText.addTextChangedListener(textWatcher);
//get the shared prefrences containing the user saved URLs
savedSites = getSharedPreferences(SITES, MODE_PRIVATE);
//get the shared tags in an ArrayList then sort them
tags = new ArrayList<>(savedSites.getAll().keySet());
Collections.sort(tags, String.CASE_INSENSITIVE_ORDER);
//get reference to the recycle to configure it
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
//use a linerlayout to display items in a vertical list
recyclerView.setLayoutManager(new LinearLayoutManager(this));
//create recyclerView.Adopter to bind tags to the RecyclerView
adapter = new SitesAdapter(tags, itemClickListener, itemLongClickListener);
recyclerView.setAdapter(adapter);
recyclerView.addItemDecoration(new ItemDivider(this));
//register listner to save a new or edit search
saveFloatingActionButton = (FloatingActionButton) findViewById(R.id.fab);
saveFloatingActionButton.setOnClickListener(saveButtonListener);
updateSaveFAB();
}
private final TextWatcher textWatcher= new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
updateSaveFAB();
}
@Override
public void afterTextChanged(Editable s) {
}
};
//show or hide the saveFloatingActionButton
private void updateSaveFAB() {
//check if there is input in both EditButton
if (urlEditText.getText().toString().isEmpty() || tagEditText.getText().toString().isEmpty())
saveFloatingActionButton.hide();
else
saveFloatingActionButton.show();
}
//saveButtonListener save a tag query pair into sharedPrefrece
private final OnClickListener saveButtonListener=new OnClickListener() {
@Override
public void onClick(View view) {
String query = urlEditText.getText().toString();
String tag = tagEditText.getText().toString();
if (!query.isEmpty() && !tag.isEmpty()) {
//hide the virtual keyboard
((InputMethodManager) getSystemService(
Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(view.getWindowToken(),0);
addTaggedSites(tag, query);//add/update the search
urlEditText.setText("");//Clear queryEditText
tagEditText.setText("");//clear tagEditText
urlEditText.requestFocus();
}
}
};
//add new search to file then refresh all button
private void addTaggedSites(String tag, String query) {
//get a sharedprefrence editor to store new tag/query pair
SharedPreferences.Editor preferencesEditor = savedSites.edit();
preferencesEditor.putString(tag, query);
preferencesEditor.apply();
//if tag is new> add and sort tags then display update
if (!tag.contains(tag)) {
tags.add(tag);
Collections.sort(tags, String.CASE_INSENSITIVE_ORDER);
adapter.notifyDataSetChanged();
}
}
//itemClickListener launches web broswer to display search results
private final OnClickListener itemClickListener=new OnClickListener() {
@Override
public void onClick(View view) {
//get query string and create a URL represeting the search
String tag= ((TextView) view).getText().toString();
String urlString=getString(R.string.search_URL)+Uri.encode(savedSites.getString(tag,""),"UTF-8");
//create an intent to lanuch a web broswer
Intent webIntent= new Intent(Intent.ACTION_VIEW,Uri.parse(urlString));
startActivity(webIntent);
}
};
//itemLongClickListener displays a dialog allowing the user to share edit or delete a saved search
private final OnLongClickListener itemLongClickListener= new OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
//get the tag that the user long touched
final String tag = ((TextView) view).getText().toString();
//creatw a new AlertDialog
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
//set the alertDialog title
builder.setTitle(getString(R.string.share_edit_delete_title, tag));
//set list of items to display and create event handler
builder.setItems(R.array.dialog_items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0://share
shareSites(tag);
break;
case 1://edit
tagEditText.setText(tag);
urlEditText.setText(savedSites.getString(tag, ""));
break;
case 2: //delete
deleteSites(tag);
break;
}
}
}
);
//set the alertDialog negetive button
builder.setNegativeButton(getString(R.string.cancel), null);
builder.create().show();//display the alert dialog
return true;
}
};
//allow user to choose app for sharing URL of a saved search
private void shareSites(String tag){
//create the URL representing the search
String urlString= getString(R.string.search_URL)+Uri.encode(savedSites.getString(tag, ""), "UTF-8");
//create an intent to share urlString
Intent shareIntent= new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.share_subject));
shareIntent.putExtra(Intent.EXTRA_TEXT,getString(R.string.share_message,urlString));
shareIntent.setType("text/plain");
//display app that can share plain text
startActivity(Intent.createChooser(shareIntent,getString(R.string.share_search)));
}
//delete search after user confirms
private void deleteSites(final String tag){
//create a new AlertDialog and set its message
AlertDialog.Builder confirmBuilder= new AlertDialog.Builder(this);
confirmBuilder.setMessage(getString(R.string.confirm_message, tag));
//cancel button configration
confirmBuilder.setNegativeButton(getString(R.string.cancel), null);
//positive DELETE button
confirmBuilder.setPositiveButton(getString(R.string.delete),new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog , int id){
tags.remove(tag);
//remove sharedPerefrences.Editor from Sharedprefrences
SharedPreferences.Editor preferenceEditor= savedSites.edit();
preferenceEditor.remove(tag);
preferenceEditor.apply();
adapter.notifyDataSetChanged();
}
}
);
confirmBuilder.create().show();
}
}
これは私の採用コード
package com.deitel.favoritesites;
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.List;
public class SitesAdapter extends RecyclerView.Adapter<SitesAdapter.ViewHolder> {
private final View.OnClickListener clickListener;
private final View.OnLongClickListener longClickListener;
private final List<String> tags;
public SitesAdapter(List<String> tags, View.OnClickListener clickListener, View.OnLongClickListener longClickListener) {
this.tags = tags;
this.clickListener = clickListener;
this.longClickListener = longClickListener;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public final TextView textView;
public ViewHolder(View itemView, View.OnClickListener clickListener, View.OnLongClickListener longClickListener) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.textView);
itemView.setOnClickListener(clickListener);
itemView.setOnLongClickListener(longClickListener);
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
return (new ViewHolder(view, clickListener, longClickListener));
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.textView.setText(tags.get(position));
}
@Override
public int getItemCount() {
return tags.size();
}
}
ここでアダプタコードを共有します。 –