Файлы могут быть сохранены, но в R.id не добавится переменная. Сохраняй xml - Ctr+Shift+S
Держи мой код... тут с фрагментом.
MainActivity.java
[syntax=java]package com.example.p0191_simplecalculator;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
final int MENU_RESET_ID = 1;
final int MENU_QUIT_ID = 2;
//private Fragment fragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, MENU_RESET_ID, 0, "Reset");
menu.add(0, MENU_QUIT_ID, 0, "Quit");
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case MENU_RESET_ID:
// обработка меню
PlaceholderFragment.etNum1Text("");
PlaceholderFragment.etNum2Text("");
//((PlaceholderFragment) fragment).GetEtNum1().setText("");
//((PlaceholderFragment) fragment).GetEtNum2().setText("");
// tvResult.setText("");
break;
case MENU_QUIT_ID:
// завершение
finish();
break;
}
// 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment implements OnClickListener {
public PlaceholderFragment() {
}
public static void etNum1Text(String newText){
etNum1.setText(newText);
}
public static void etNum2Text(String newText){
etNum2.setText(newText);
}
// public EditText GetEtNum1() {
// return etNum1;
//
// }
// public EditText GetEtNum2() {
// return etNum2;
// }
static EditText etNum1;
static EditText etNum2;
Button btnAdd;
Button btnSub;
Button btnMult;
Button btnDiv;
TextView tvResult;
String oper = "";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
etNum1 = (EditText) rootView.findViewById(R.id.etNum1);
etNum2 = (EditText) rootView.findViewById(R.id.etNum2);
btnAdd = (Button) rootView.findViewById(R.id.btnAdd);
btnSub = (Button) rootView.findViewById(R.id.btnSub);
btnMult = (Button) rootView.findViewById(R.id.btnMult);
btnDiv = (Button) rootView.findViewById(R.id.btnDiv);
tvResult = (TextView) rootView.findViewById(R.id.tvResult);
btnAdd.setOnClickListener(this);
btnSub.setOnClickListener(this);
btnMult.setOnClickListener(this);
btnDiv.setOnClickListener(this);
return rootView;
}
@Override
public void onClick(View v) {
float num1 = 0;
float num2 = 0;
float result = 0;
if (TextUtils.isEmpty(etNum1.getText().toString())
|| TextUtils.isEmpty(etNum2.getText().toString())) {
return;
}
num1 = Float.parseFloat(etNum1.getText().toString());
num2 = Float.parseFloat(etNum2.getText().toString());
switch (v.getId()) {
case R.id.btnAdd:
oper = "+";
result = num1 + num2;
break;
case R.id.btnSub:
oper = "-";
result = num1 - num2;
break;
case R.id.btnMult:
oper = "*";
result = num1 * num2;
break;
case R.id.btnDiv:
oper = "/";
result = num1 / num2;
break;
default:
break;
}
tvResult.setText(num1 + " " + oper + " " + num2 + " = " + result);
}
}
}
[/syntax]
fragment_main.xml
[syntax=xml]<LinearLayout xmlns:android="
http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10pt"
android:layout_marginRight="10pt"
android:layout_marginTop="3pt" >
<EditText
android:id="@+id/etNum1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="5pt"
android:layout_weight="1"
android:inputType="numberDecimal" >
</EditText>
<EditText
android:id="@+id/etNum2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5pt"
android:layout_weight="1"
android:inputType="numberDecimal" >
</EditText>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5pt"
android:layout_marginRight="5pt"
android:layout_marginTop="3pt" >
<Button
android:id="@+id/btnAdd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="+"
android:textSize="8pt" >
</Button>
<Button
android:id="@+id/btnSub"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="-"
android:textSize="8pt" >
</Button>
<Button
android:id="@+id/btnMult"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="*"
android:textSize="8pt" >
</Button>
<Button
android:id="@+id/btnDiv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="/"
android:textSize="8pt" >
</Button>
</LinearLayout>
<TextView
android:id="@+id/tvResult"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5pt"
android:layout_marginRight="5pt"
android:layout_marginTop="3pt"
android:gravity="center_horizontal"
android:textSize="12pt" >
</TextView>
</LinearLayout>[/syntax]
Тут должна быть подпись.
