【移動(dòng)應(yīng)用開發(fā)技術(shù)】如何使用android實(shí)現(xiàn)簡易計(jì)算器

【移動(dòng)應(yīng)用開發(fā)技術(shù)】如何使用android實(shí)現(xiàn)簡易計(jì)算器

這篇文章將為大家詳細(xì)講解有關(guān)如何使用android實(shí)現(xiàn)簡易計(jì)算器，在下覺得挺實(shí)用的，因此分享給大家做個(gè)參考，希望大家閱讀完這篇文章后可以有所收獲。具體內(nèi)容如下效果圖：一、如圖，首先布局計(jì)算器主頁顯示activity_main.xml<RelativeLayout

xmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

>

<EditText

android:id="@+id/num1"

android:layout_width="80dp"

android:layout_height="wrap_content"

android:inputType="number"

/>

<TextView

android:id="@+id/type"

android:layout_width="40dp"

android:layout_height="50dp"

android:layout_toRightOf="@id/num1"

android:gravity="center"

/>

<EditText

android:id="@+id/num2"

android:layout_width="80dp"

android:layout_height="wrap_content"

android:layout_toRightOf="@id/num1"

android:layout_marginLeft="50dp"

android:inputType="number"

/>

<TextView

android:id="@+id/equal"

android:layout_width="80dp"

android:layout_height="50dp"

android:layout_toRightOf="@id/num2"

android:gravity="center"

/>

<Button

android:id="@+id/add"

android:layout_width="70dp"

android:layout_height="wrap_content"

android:layout_below="@id/num1"

android:text="@string/add"

/>

<Button

android:id="@+id/sub"

android:layout_width="70dp"

android:layout_height="wrap_content"

android:layout_toRightOf="@id/add"

android:layout_alignTop="@id/add"

android:text="@string/sub"

/>

<Button

android:id="@+id/mul"

android:layout_width="70dp"

android:layout_height="wrap_content"

android:layout_toRightOf="@id/sub"

android:layout_alignTop="@id/sub"

android:text="@string/mul"

/>

<Button

android:id="@+id/div"

android:layout_width="70dp"

android:layout_height="wrap_content"

android:layout_toRightOf="@id/mul"

android:layout_alignTop="@id/mul"

android:text="@string/div"

/>

</RelativeLayout>二、計(jì)算器實(shí)現(xiàn)的方法public

class

CalculatorBiz

{

public

float

add(float

num1,float

num2){

return

num1+num2;

}

public

float

sub(float

num1,float

num2){

return

num1-num2;

}

public

float

mul(float

num1,float

num2){

return

num1*num2;

}

public

float

div(float

num1,float

num2){

return

num1/num2;

}

}三、MainActivity主要方法public

class

MainActivity

extends

Activity

{

//定義組件

private

EditText

inputnum1;

private

EditText

inputnum2;

private

TextView

type;

private

TextView

equal;

private

Button

add;

private

Button

sub;

private

Button

mul;

private

Button

div;

CalculatorBiz

calculator=new

CalculatorBiz();

@Override

public

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//查找組件

inputnum1=(EditText)

findViewById(R.id.num1);

inputnum2=(EditText)

findViewById(R.id.num2);

type=(TextView)

findViewById(R.id.type);

equal=(TextView)

findViewById(R.id.equal);

add=(Button)

findViewById(R.id.add);

sub=(Button)

findViewById(R.id.sub);

mul=(Button)

findViewById(R.id.mul);

div=(Button)

findViewById(R.id.div);

type.setTextColor(Color.WHITE);

equal.setTextColor(Color.WHITE);

add.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

v)

{

String

num1=inputnum1.getText().toString();

String

num2=inputnum2.getText().toString();

float

a=Float.parseFloat(num1);

float

b=Float.parseFloat(num2);

type.setText("+");

equal.setText("="+calculator.add(a,

b));

}});

sub.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

v)

{

String

num1=inputnum1.getText().toString();

String

num2=inputnum2.getText().toString();

float

a=Float.parseFloat(num1);

float

b=Float.parseFloat(num2);

type.setText("-");

equal.setText("="+calculator.sub(a,

b));

}});

mul.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

v)

{

String

num1=inputnum1.getText().toString();

String

num2=inputnum2.getText().toString();

float

a=Float.parseFloat(num1);

float

b=Float.parseFloat(num2);

type.setText("*");

equal.setText("="+calculator.mul(a,

b));

}});

div.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

v)

{

String

num1=inputnum1.getText().toString();

String

num2=inputnum2.getText().toString();

float

a=Float.parseFloat(num1);

float

b=Float.parseFloat(num2);

type.setText("/");

equal.setText("="+calculator.div(a,

b));

}});

}

@Override

public

boolean

onCreateOptionsMenu(Menu

menu)

{

super.onCreateOptionsMenu(menu);

menu.add(0,

1,

0,

"關(guān)于");

menu.add(0,

2,

1,

"退出");

menu.findItem(2);

return

true;

}

public

boolean

onOptionsItemSelected(MenuItem

item){

if(item.getItemId()

==

1){

Toast.makeText(this,

"詳細(xì)內(nèi)容\n"+"作者：dyp\n"+"版本：version1",

Toast.LENGTH_LONG).show();

}else

if(i