android加法编程,Android简单的加法计算器

package com.example.calculator;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends Activity {

private TextView tv1;

private EditText et1;

private EditText et2;

private Button btn;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv1 = (TextView) this.findViewById(R.id.textView1);

et1 = (EditText) this.findViewById(R.id.editText1);

et2 = (EditText) this.findViewById(R.id.editText2);

btn = (Button) this.findViewById(R.id.button1);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

String inputText1 = et1.getText().toString();

String inputText2 = et2.getText().toString();

int num1 = Integer.valueOf(inputText1).intValue();

int num2 = Integer.valueOf(inputText2).intValue();

num1 = num1+num2;

inputText1 = String.valueOf(num1);

tv1.setText(inputText1);

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}