本文实例为大家分享了android实现简易计算器展示的具体代码，供大家参考，具体内容如下
效果图：
一、如图，首先布局计算器主页显示
activity_main.xml
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/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、计算器实现的方法
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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
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public class MainActivity extends Activity { //定义组件 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); //查找组件 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, "关于"); menu.add(0, 2, 1, "退出"); menu.findItem(2); return true; } public boolean onOptionsItemSelected(MenuItem item){ if(item.getItemId() == 1){ Toast.makeText(this, "详细内容\n"+"作者：dyp\n"+"版本：version1", Toast.LENGTH_LONG).show(); }else if(item.getItemId() == 2){ Toast.makeText(this, "退出\n"+"你确定退出程序？", Toast.LENGTH_LONG).show(); } return super.onOptionsItemSelected(item); } } |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/duyuping/article/details/7989530
