@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(); 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 { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } }} 我代码这么写不对吗? 指点一下
package com.example.calculator;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;public class MainActivity extends ActionBarActivity {
private int number = 0;
private int result = 0;
private int operatorId;
private EditText input;
String sb=new String();
@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();
}
}
public boolean vbegin = true;
public void onNumberButtonClick(View view) {
Button button = (Button) view;
number = number * 10 + Integer.parseInt(button.getText().toString());
show(number);
}
public void onOperatorButtonClick(View view) {
operatorId = view.getId();
result = number;
number = 0;
}
public void onEqualButtonClick(View view) {
switch (operatorId) {
case R.id.bt_plus:
result += number;
break; case R.id.bt_hyphen:
result -= number;
break; case R.id.bt_asterisk:
result *= number;
break; case R.id.bt_slash:
result /= number;
break; default:
assert false;
break;
} number = 0;
show(result);
}
public void onClearButtonClick(View view) {
number = 0;
result = 0;
operatorId = 0;
show(number);
}
//从这里开始
public void onBackspaceButtonClick(View view){
String str = input.getText().toString();
if(str.length() > 1)
input.setText(str.substring(0, str.length() - 1));
else if(str.length() == 1) {
input.setText("0");
vbegin = true;
}
}
//到这里
private void show(int number) {
// TODO Auto-generated method stub
TextView resultView = (TextView) findViewById(R.id.input);
resultView.setText(Integer.toString(number));
}
@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();
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 { public PlaceholderFragment() {
} @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}}
我代码这么写不对吗?
指点一下