Android Studio实现简易计算器源码
本文实例为大家分享了Android Studio实现简易计算器的具体代码,供大家参考,具体内容如下
效果图:
源码:
布局样式:
<?xml version="1.0" encoding="utf-8"?> <GridLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:baselineAligned="false" android:background="@color/grey" android:columnCount="4" android:rowCount="6"> <TextView android:id="@+id/textview_01" android:layout_columnSpan="4" android:layout_gravity="fill" android:gravity="right" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" android:background="@color/grey" android:paddingRight="20dp" android:paddingTop="40dp" android:text="0" android:layout_columnWeight="1" android:textSize="88sp"> </TextView> <Button android:id="@+id/button_return" android:layout_columnSpan="2" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="2dp" android:background="@color/white" android:textSize="30dp" android:textStyle="bold" android:text="回退" /> <Button android:id="@+id/button_clear" android:layout_columnSpan="2" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="2dp" android:background="@color/white" android:textSize="30dp" android:textStyle="bold" android:text="清空"/> <Button android:id="@+id/button_add" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="+"/> <Button android:id="@+id/button_01" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="1"/> <Button android:id="@+id/button_02" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="2"/> <Button android:id="@+id/button_03" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="3"/> <Button android:id="@+id/button_reduce" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="-"/> <Button android:id="@+id/button_04" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="4"/> <Button android:id="@+id/button_05" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="5"/> <Button android:id="@+id/button_06" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="6"/> <Button android:id="@+id/button_ride" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="*"/> <Button android:id="@+id/button_07" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="7"/> <Button android:id="@+id/button_08" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="8"/> <Button android:id="@+id/button_09" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="9"/> <Button android:id="@+id/button_except" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="/"/> <Button android:id="@+id/button_spot" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="."/> <Button android:id="@+id/button_00" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="0"/> <Button android:id="@+id/button_equal" android:layout_columnSpan="1" android:gravity="center" android:layout_columnWeight="1" android:layout_rowWeight="1" android:layout_margin="1dp" android:background="@color/white" android:textSize="50dp" android:text="="/> </GridLayout>
Java部分源码:
package com.example.pyfcalculator; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends AppCompatActivity implements View.OnClickListener { TextView textView; Button button_return,button_00,button_01,button_02,button_03, button_04,button_05,button_06,button_07,button_08,button_09,button_add, button_clear,button_equal,button_except,button_reduce,button_ride,button_spot; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViewAndListener(); } //注册监听方法 protected void initViewAndListener(){ button_return=findViewById(R.id.button_return); button_00=findViewById(R.id.button_00); button_01=findViewById(R.id.button_01); button_02=findViewById(R.id.button_02); button_03=findViewById(R.id.button_03); button_04=findViewById(R.id.button_04); button_05=findViewById(R.id.button_05); button_06=findViewById(R.id.button_06); button_07=findViewById(R.id.button_07); button_08=findViewById(R.id.button_08); button_09=findViewById(R.id.button_09); button_add=findViewById(R.id.button_add); button_clear=findViewById(R.id.button_clear); button_equal=findViewById(R.id.button_equal); button_except=findViewById(R.id.button_except); button_reduce=findViewById(R.id.button_reduce); button_ride=findViewById(R.id.button_ride); button_spot=findViewById(R.id.button_spot); button_return.setOnClickListener(this); button_00.setOnClickListener(this); button_01.setOnClickListener(this); button_02.setOnClickListener(this); button_03.setOnClickListener(this); button_04.setOnClickListener(this); button_05.setOnClickListener(this); button_06.setOnClickListener(this); button_07.setOnClickListener(this); button_08.setOnClickListener(this); button_09.setOnClickListener(this); button_add.setOnClickListener(this); button_clear.setOnClickListener(this); button_equal.setOnClickListener(this); button_except.setOnClickListener(this); button_reduce.setOnClickListener(this); button_ride.setOnClickListener(this); button_spot.setOnClickListener(this); textView=findViewById(R.id.textview_01); } private String num_in_now;//记录当前结果 private boolean flag=false;//记录计算器状态 int now_num=0; @Override public void onClick(View view) { //获取文本框内容 String currentText=textView.getText().toString(); switch (view.getId()){ case R.id.button_00: if ((textView.getText().toString().equals("0"))) return; isflag("0"); break; case R.id.button_01: isflag("1"); break; case R.id.button_02: isflag("2"); break; case R.id.button_03: isflag("3"); break; case R.id.button_04: isflag("4"); break; case R.id.button_05: isflag("5"); break; case R.id.button_06: isflag("6"); break; case R.id.button_07: isflag("7"); break; case R.id.button_08: isflag("8"); break; case R.id.button_09: isflag("9"); break; case R.id.button_add: // textView.setText(textView.getText()+"+"); now_num++; if(now_num>1){ equal(); } isflag("+"); break; case R.id.button_except: // textView.setText(textView.getText()+"/"); now_num++; if(now_num>1){ equal(); } isflag("/"); break; case R.id.button_spot: // textView.setText(textView.getText()+"."); isflag("."); break; case R.id.button_reduce: // textView.setText(textView.getText()+"-"); now_num++; if(now_num>1){ equal(); } isflag("-"); break; case R.id.button_ride: // textView.setText(textView.getText()+"*"); now_num++; if(now_num>1){ equal(); } isflag("*"); break; case R.id.button_clear: textView.setText("0"); flag=false; now_num=0; break; case R.id.button_return: if(TextUtils.isEmpty(textView.getText())){ return; } if (currentText.substring(0,currentText.length()-1).length()>0){ textView.setText(currentText.substring(0,currentText.length()-1)); } else{ textView.setText("0"); flag=false; now_num=0; } break; case R.id.button_equal: if(TextUtils.isEmpty(textView.getText())){ return; } equal(); flag=false; now_num=0; break; } } private void equal(){ textView.setText(operation(textView.getText().toString())); } //运算方法 private String operation(String string){ int index; double num_1,num_2; if (string.contains("+")){ index=string.indexOf("+"); num_1= Double.parseDouble(string.substring(0,index)); num_2= Double.parseDouble(string.substring(index+1,string.length())); return num_1+num_2+""; } if (string.contains("-")){ index=string.indexOf("-"); if(index==0){ String string_2=string.substring(1,string.length()); int index_2=string_2.indexOf("-"); num_1= Double.parseDouble(string_2.substring(0,index_2)); num_2= Double.parseDouble(string_2.substring(index_2+1,string_2.length())); return (-(num_1+num_2))+""; }else{ num_1= Double.parseDouble(string.substring(0,index)); num_2= Double.parseDouble(string.substring(index+1,string.length())); return num_1-num_2+""; } } if (string.contains("*")){ index=string.indexOf("*"); num_1= Double.parseDouble(string.substring(0,index)); num_2= Double.parseDouble(string.substring(index+1,string.length())); return num_1*num_2+""; } if (string.contains("/")){ index=string.indexOf("/"); num_1= Double.parseDouble(string.substring(0,index)); num_2= Double.parseDouble(string.substring(index+1,string.length())); return num_1/num_2+""; } return "error!!!"; } //判断0要不要被替换 看flag的状态 输入数字 private void isflag(String info){ if (flag){ textView.setText(textView.getText()+info); }else{ if(info.equals(".")||info.equals("+")||info.equals("-")||info.equals("*")||info.equals("/")){ textView.setText(textView.getText()+info); }else { textView.setText(info); } flag=true; } } }
其余资源没有太大难度,就不一展现了!
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