笔记|Android开发实战——计算器

实习第四天了,第一天熟悉了一下java,这三天学习了解了一下安卓开发的一些基础知识。做了一个小程序—计算器,以此帖来记录一下。也许也有人可以参考一下)功能真的只有最基本哈哈,最最新手的人可以参考hh
首先是activity_main.xml的布局代码


这是布局的效果,渐变文本框的效果还需要加一个drawable布局资源
笔记|Android开发实战——计算器
文章图片

需要用到drawable里的rectborder.xml如下:
xmlns:android="http://schemas.android.com/apk/res/android" >

接下来是MainActivity.java文件
package com.example.test_0; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private Button num0_btn; private Button num1_btn; private Button num2_btn; private Button num3_btn; private Button num4_btn; private Button num5_btn; private Button num6_btn; private Button num7_btn; private Button num8_btn; private Button num9_btn; private Button mult_btn; private Button divide_btn; private Button dot_btn; private Button result_btn; private Button back_btn; private Button delete_btn; private Button plus_btn; private Button minus_btn; private TextView textview_1; private double NO1=0; private int flag=0; private int flag_1=0; private double NO2=0; private double end=0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); num0_btn = (Button) findViewById(R.id.num0_btn); num1_btn = (Button) findViewById(R.id.num1_btn); num2_btn = (Button) findViewById(R.id.num2_btn); num3_btn = (Button) findViewById(R.id.num3_btn); num4_btn = (Button) findViewById(R.id.num4_btn); num5_btn = (Button) findViewById(R.id.num5_btn); num6_btn = (Button) findViewById(R.id.num6_btn); num7_btn = (Button) findViewById(R.id.num7_btn); num8_btn = (Button) findViewById(R.id.num8_btn); num9_btn = (Button) findViewById(R.id.num9_btn); divide_btn = (Button) findViewById(R.id.divide_btn); mult_btn = (Button) findViewById(R.id.mult_btn); dot_btn = (Button) findViewById(R.id.dot_btn); result_btn = (Button) findViewById(R.id.result_btn); delete_btn = (Button) findViewById(R.id.delete_btn); back_btn = (Button) findViewById(R.id.back_btn); plus_btn = (Button) findViewById(R.id.plus_btn); minus_btn = (Button) findViewById(R.id.minus_btn); textview_1 = (TextView) findViewById(R.id.textview_1); num0_btn.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("0"); if (flag==0) { NO1 = 10 * NO1 + 0; } else { NO2 =10* NO2+0; } } }); num1_btn.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("1"); if (flag==0) { NO1 = 10 * NO1 + 1; } else { NO2 =10* NO2+1; } } }); num2_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("2"); if (flag==0) { NO1 = 10 * NO1 + 2; } else { NO2 =10* NO2+2; } } }); num3_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("3"); if (flag==0) { NO1 = 10 * NO1 + 3; } else { NO2 =10* NO2+3; } } }); num4_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("4"); if (flag==0) { NO1 = 10 * NO1 + 4; } else { NO2 =10* NO2+4; } } }); num5_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("5"); if (flag==0) { NO1 = 10 * NO1 + 5; } else { NO2 =10* NO2+5; } } }); num6_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("6"); if (flag==0) { NO1 = 10 * NO1 + 6; } else { NO2 =10* NO2+6; } } }); num7_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("7"); if (flag==0) { NO1 = 10 * NO1 + 7; } else { NO2 =10* NO2+7; } } }); num8_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("8"); if (flag==0) { NO1 = 10 * NO1 + 8; } else { NO2 =10* NO2+8; } } }); num9_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { //System.out.println(textview_1.getText()); if (flag_1!=0) { textview_1.setText(""); flag_1=0; } textview_1.append("9"); if (flag==0) { NO1 = 10 * NO1 + 9; } else { NO2 =10* NO2+9; } } }); delete_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (textview_1.getText()=="0") { textview_1.setText(""); } textview_1.setText(""); flag=0; } }); plus_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { flag=1; flag_1=1; // textview_1.setText(""); } }); mult_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { flag=3; flag_1=1; //textview_1.setText(""); } }); divide_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { flag=4; flag_1=1; //textview_1.setText(""); } }); minus_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { flag=2; flag_1=1; //textview_1.setText(""); } }); result_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (flag==1) {end=NO1+NO2; textview_1.setText((String.valueOf(end))); NO1=0; NO2=0; } else if (flag==3) { end=NO1*NO2; textview_1.setText((String.valueOf(end))); NO1=0; NO2=0; } else if (flag==2) { end=NO1-NO2; textview_1.setText((String.valueOf(end))); NO1=0; NO2=0; } else if (flag==4) { end=NO1/NO2; textview_1.setText((String.valueOf(end))); NO1=0; NO2=0; } } }); //divide_btn.setOnClickListener(this); //mult_btn.setOnClickListener(this); //dot_btn.setOnClickListener(this); //result_btn.setOnClickListener(this); }}

【笔记|Android开发实战——计算器】然后这个最最最最基础的计算器就做完啦。 可以进行最简单的加减乘除,每次结果算出来之后得按清除才可以进行下一次计算hh

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