android简单计算器说课材料

a n d r o i d简单计算器

欢迎大家补充

package com.example.zzz;

//此文使用了fragment的模块。

//此文使用了fragment的模块。

//此文使用了fragment的模块。

//此文使用了fragment的模块。

import android.support.v7.app.ActionBarActivity;

import android.support.v7.app.ActionBar;

import android.support.v4.app.Fragment;

import android.os.Bundle;

import youtInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

import android.os.Build;

public class MainActivity extends ActionBarActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(yout.activity_main);

if (savedInstanceState == null) {

getSupportFragmentManager().beginTransaction()

.add(R.id.container, new PlaceholderFragment()).commit();

}

}

@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;

}

@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 { //此文使用了fragment的模块。

private double a,b;

private int num=0;

private Button button1;

private Button button2;

private Button button3;

private Button button4;

private Button button5;

private Button button6;

private Button button7;

private Button button8;

private Button button9;

private Button button0;

private Button buttonjia;

private Button buttonjian;

private Button buttoncheng;

private Button buttonchu;

private Button buttonxiaoshudian;

private Button buttonqingchu;

private Button buttondengyu;

private TextView text;

public PlaceholderFragment() {

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View rootView =

inflater.inflate(yout.fragment_main, container,

false);

findbutton(rootView);//定义一个函数用于找组件

ViewEvent(rootView);//定义一个函数。用于初始化监听

器（将组件与监听器相连接）

//注意，设置监听器的时候必须保证找到了组件。否则程序

用易出错。特别提醒

return rootView;//使用fragment，此处的返回值必须为rootView，上面有函数可以看一下、

}

private void findbutton(View rootView){

button0=(Button)rootView.findViewById(R.id.button0);

button1=(Button)rootView.findViewById(R.id.button1);

button2=(Button)rootView.findViewById(R.id.button2);

button3=(Button)rootView.findViewById(R.id.button3);

button4=(Button)rootView.findViewById(R.id.button4);

button5=(Button)rootView.findViewById(R.id.button5);

button6=(Button)rootView.findViewById(R.id.button6);

button7=(Button)rootView.findViewById(R.id.button7);

button8=(Button)rootView.findViewById(R.id.button8);

button9=(Button)rootView.findViewById(R.id.button9);

button0=(Button)rootView.findViewById(R.id.button0);

buttonjia=(Button)rootView.findViewById(R.id.buttonjia);

buttonjian=(Button)rootView.findViewById(R.id.buttonjian);

buttoncheng=(Button)rootView.findViewById(R.id.buttoncheng);