Android Studio实现人民币与美元的转换
16lz
2021-01-23
1.MainActivity
package com.example.flyyu.first2;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements View.OnClickListener{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public void onClick(View v) { EditText editTextren = (EditText)findViewById(R.id.editTextren); EditText editTextmei = (EditText)findViewById(R.id.editTextmei); EditText editTexthui = (EditText)findViewById(R.id.editTexthui); double R1 = 0; double M; double Huan; String a; String s; String b; if (v.getId()==R.id.button){ a=editTextren.getText().toString(); if("".equals(a)){ R1 = 0; } else{ R1 =Float.valueOf(a); } b=editTexthui.getText().toString(); if("".equals(b)){ Huan = 0; } else{ Huan =Float.valueOf(b); } if (Huan==0){ Toast.makeText(MainActivity.this,"输入有误",Toast.LENGTH_SHORT).show(); } else { M=R1/Huan; editTextmei.setText(M+""); } } else{ a=editTextmei.getText().toString(); if("".equals(a)){ M = 0; } else{ M =Float.valueOf(a); } b=editTexthui.getText().toString(); if("".equals(b)){ Huan = 0; } else{ Huan =Float.valueOf(b); } if (Huan==0){ Toast.makeText(MainActivity.this,"输入有误",Toast.LENGTH_SHORT).show(); }else { R1=M*Huan; editTextren.setText(R1+""); } } }}2.activity_main
<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.flyyu.first2.MainActivity"> <LinearLayout android:layout_width="368dp" android:layout_height="495dp" android:orientation="vertical" tools:layout_editor_absoluteY="8dp" tools:layout_editor_absoluteX="8dp"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="8dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="8dp" android:layout_weight="1" android:text="人民币金额：" app:layout_constraintBottom_toTopOf="@+id/edittxt_ren" app:layout_constraintHorizontal_bias="0.176" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/edittxt_huilv" app:layout_constraintVertical_bias="0.812" /> <EditText android:id="@+id/editTextren" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="8dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="8dp" android:layout_weight="1" android:ems="10" android:inputType="numberDecimal" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintHorizontal_bias="0.326" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.181" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView2" android:layout_width="match_parent" android:layout_height="27dp" android:layout_marginBottom="8dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="8dp" android:layout_weight="1" android:text="美元兑人民币汇率：" app:layout_constraintBottom_toTopOf="@+id/edittxt_huilv" app:layout_constraintHorizontal_bias="0.226" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/edittxt_mei" app:layout_constraintVertical_bias="1.0" /> <EditText android:id="@+id/editTexthui" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="7dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="8dp" android:layout_weight="1" android:ems="10" android:inputType="numberDecimal" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintHorizontal_bias="0.326" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.607" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView3" android:layout_width="match_parent" android:layout_height="27dp" android:layout_marginBottom="0dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="8dp" android:layout_weight="1" android:text="美元金额：" app:layout_constraintBottom_toTopOf="@+id/edittxt_mei" app:layout_constraintHorizontal_bias="0.182" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.744" /> <EditText android:id="@+id/editTextmei" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="8dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="8dp" android:layout_weight="1" android:ems="10" android:inputType="numberDecimal" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintHorizontal_bias="0.326" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.389" /> </LinearLayout> <Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="39dp" android:layout_marginBottom="8dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="28dp" android:onClick="onClick" android:text="美元转人民币" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintHorizontal_bias="0.287" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/btn_ren" app:layout_constraintVertical_bias="0.088" /> <Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="40dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:onClick="onClick" android:text="人民币转美元" app:layout_constraintHorizontal_bias="0.29" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/edittxt_ren" tools:layout_editor_absoluteY="350dp" /> </LinearLayout></android.support.constraint.ConstraintLayout>更多相关文章
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