我正在制作笔记应用。当我点击R.id.delete_settings或fab12时，会打开一个名为 NewNote.java 的新活动。
当我点击EditTexts时，我想在 MainActivity.java 中添加2个R.id.send_new_note我的recyclelerview。我无法弄清楚如何添加项目（是的，我看了很多网站）。正如你所看到的，当我点击它时，我可以删除内容。我已经包含了很多代码，所以你可以帮助我更好。任何帮助深表感谢！ ：d
package zeta.bedi.gursimran.zeta;
public class MainActivity extends AppCompatActivity {
//Toolbar
private Toolbar toolbar;
//RecyclerView
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private static String LOG_TAG = "MainActivity";
//FAB
private FloatingActionButton fab12;
private FloatingActionButton fab22;
private List<FloatingActionMenu> menus = new ArrayList<>();
private Handler mUiHandler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Toolbar
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
//RecyclerView
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyAdapter(getDataSet());
mRecyclerView.setAdapter(mAdapter);
DividerItemDecoration itemDecoration = new DividerItemDecoration(this, LinearLayoutManager.VERTICAL);
mRecyclerView.addItemDecoration(itemDecoration);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
//FAB
final FloatingActionMenu menu2 = (FloatingActionMenu) findViewById(R.id.menu2);
menus.add(menu2);
menu2.hideMenuButton(true);
int delay = 400;
for (final FloatingActionMenu menu : menus) {
mUiHandler.postDelayed(new Runnable() {
@Override
public void run() {
menu.showMenuButton(true);
}
}, delay);
delay += 150;
}
menu2.setOnMenuToggleListener(new FloatingActionMenu.OnMenuToggleListener() {
@Override
public void onMenuToggle(boolean opened) {
String text;
if (opened) {
text = "Menu opened";
} else {
text = "Menu closed";
}
Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show();
}
});
fab12 = (FloatingActionButton) findViewById(R.id.fab12);
fab22 = (FloatingActionButton) findViewById(R.id.fab22);
fab12.setOnClickListener(clickListener);
fab22.setOnClickListener(clickListener);
}
@Override
protected void onResume() {
super.onResume();
((MyAdapter) mAdapter).setOnItemClickListener(new MyAdapter.MyClickListener() {
@Override
public void onItemClick(int position, View v) {
//Delete items
Log.i(LOG_TAG, " Removed " + position);
((MyAdapter) mAdapter).deleteEntity(position);
}
});
}
public ArrayList<MyInformation> getDataSet() {
ArrayList results = new ArrayList<MyInformation>();
for (int i = 0; i < 5; i++) {
MyInformation information = new MyInformation("Hi " + i, "Secondary " + i);
results.add(i, information);
}
TextView newNote = (TextView) findViewById(R.id.edit_text_note);
TextView newTitle = (TextView) findViewById(R.id.edit_text_title);
return results;
}
@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) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
if (id == R.id.delete_settings) {
startActivity(new Intent(this, NewNote.class));
return true;
}
return super.onOptionsItemSelected(item);
}
public View.OnClickListener clickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
String text;
switch (v.getId()) {
case R.id.fab12:
text = fab12.getLabelText();
startActivity(new Intent(MainActivity.this, NewNote.class));
break;
case R.id.fab22:
text = fab22.getLabelText();
break;
}
}
};
}
package zeta.bedi.gursimran.zeta;
public class NewNote extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_note);
Toolbar toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
}
@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_new_note, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
if (id == android.R.id.home) {
NavUtils.navigateUpFromSameTask(this);
}
if (id == R.id.send_new_note) {
}
return super.onOptionsItemSelected(item);
}
}
package zeta.bedi.gursimran.zeta;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private ArrayList<MyInformation> information;
private static MyClickListener myClickListener;
private static String LOG_TAG = "MyRecyclerViewAdapter";
public static class ViewHolder
extends RecyclerView.ViewHolder
implements View.OnClickListener {
TextView title;
TextView note;
ImageView image;
public ViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.title);
note = (TextView) itemView.findViewById(R.id.note);
image = (ImageView) itemView.findViewById(R.id.imageView);
Log.i(LOG_TAG, "Adding Listener");
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
myClickListener.onItemClick(getPosition(), v);
Log.i(LOG_TAG, "CLICK Listener" + getPosition());
}
}
public void setOnItemClickListener(MyClickListener myClickListener) {
this.myClickListener = myClickListener;
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(ArrayList<MyInformation> information) {
this.information = information;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.title.setText(information.get(position).getTitle());
holder.note.setText(information.get(position).getNote());
}
public void addItem(MyInformation myInformation, int index) {
information.add(myInformation);
notifyItemInserted(index);
}
public void deleteItem(int index) {
information.remove(index);
notifyItemRemoved(index);
}
public void setData(final List<MyInformation> data) {
// Remove all deleted items.
for (int i = information.size() - 1; i >= 0; --i) {
if (getLocation(data, information.get(i)) < 0) {
deleteEntity(i);
}
}
// Add and move items.
for (int i = 0; i < data.size(); ++i) {
MyInformation entity = data.get(i);
int loc = getLocation(information, entity);
if (loc < 0) {
addEntity(i, entity);
} else if (loc != i) {
moveEntity(i, loc);
}
}
}
public void addEntity(int i, MyInformation entity) {
information.add(i, entity);
notifyItemInserted(i);
}
public void moveEntity(int i, int loc) {
move(information, i, loc);
notifyItemMoved(i, loc);
}
public void deleteEntity(int i) {
information.remove(i);
notifyItemRemoved(i);
}
private void move(List<MyInformation> data, int a, int b) {
MyInformation temp = data.remove(a);
data.add(b, temp);
}
private int getLocation(List<MyInformation> data, MyInformation entity) {
for (int j = 0; j < data.size(); ++j) {
MyInformation newEntity = data.get(j);
if (entity.equals(newEntity)) {
return j;
}
}
return -1;
}
@Override
public int getItemCount() {
return information.size();
}
public interface MyClickListener {
public void onItemClick(int position, View v);
}
}
package zeta.bedi.gursimran.zeta;
public class MyInformation {
String title;
String note;
public MyInformation(String title, String note) {
this.title = title;
this.note = note;
}
public String getNote() {
return note;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public void setNote(String note) {
this.note = note;
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="zeta.bedi.gursimran.zeta.NewNote">
<include
android:id="@+id/app_bar"
layout="@layout/app_bar"
/>
<EditText
android:layout_width="@dimen/edit_title_width"
android:layout_height="wrap_content"
android:id="@+id/edit_text_title"
android:hint="@string/hint_title"
android:layout_below="@+id/app_bar"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:textSize="@dimen/edit_text_large_size"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/edit_text_note"
android:hint="@string/hint_note"
android:layout_below="@+id/edit_text_title"
android:padding="5dp"
android:inputType="textCapSentences"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:textSize="@dimen/edit_text_medium_size"
android:imeOptions="actionSend"
/>
</RelativeLayout>