今天小編給大家分享一下Android開發(fā)怎么實現(xiàn)計算器功能的相關(guān)知識點,內(nèi)容詳細,邏輯清晰,相信大部分人都還太了解這方面的知識,所以分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后有所收獲,下面我們一起來了解一下吧。
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比較簡單,所以我就沒怎么寫注釋,應(yīng)該一看就能明白的
有不明白的可以發(fā)信問我
先貼MainActivity.java代碼
package com.example.calculator; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { Button b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, bp, bs, bm, bd, bc, be; ImageView delete; TextView tv; EditText show; String showString = "", option = ""; int showfirst = 0; String exception = ""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); b0 = (Button) findViewById(R.id.bt_0); b1 = (Button) findViewById(R.id.bt_1); b2 = (Button) findViewById(R.id.bt_2); b3 = (Button) findViewById(R.id.bt_3); b4 = (Button) findViewById(R.id.bt_4); b5 = (Button) findViewById(R.id.bt_5); b6 = (Button) findViewById(R.id.bt_6); b7 = (Button) findViewById(R.id.bt_7); b8 = (Button) findViewById(R.id.bt_8); b9 = (Button) findViewById(R.id.bt_9); bp = (Button) findViewById(R.id.bt_plus); bs = (Button) findViewById(R.id.bt_sub); bm = (Button) findViewById(R.id.bt_mutilate); bd = (Button) findViewById(R.id.bt_div); bc = (Button) findViewById(R.id.bt_c); be = (Button) findViewById(R.id.bt_equ); b1.setOnClickListener(this); b2.setOnClickListener(this); b3.setOnClickListener(this); b4.setOnClickListener(this); b5.setOnClickListener(this); b6.setOnClickListener(this); b7.setOnClickListener(this); b8.setOnClickListener(this); b9.setOnClickListener(this); b0.setOnClickListener(this); bp.setOnClickListener(this); bs.setOnClickListener(this); bm.setOnClickListener(this); bd.setOnClickListener(this); bc.setOnClickListener(this); be.setOnClickListener(this); show = (EditText) findViewById(R.id.et_show); delete = (ImageView) findViewById(R.id.iv_delete); delete.setOnClickListener(this); tv=(TextView) findViewById(R.id.author); tv.setOnClickListener(this); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.bt_0: showString += "0"; break; case R.id.bt_1: showString += "1"; break; case R.id.bt_2: showString += "2"; break; case R.id.bt_3: showString += "3"; break; case R.id.bt_4: showString += "4"; break; case R.id.bt_5: showString += "5"; break; case R.id.bt_6: showString += "6"; break; case R.id.bt_7: showString += "7"; break; case R.id.bt_8: showString += "8"; break; case R.id.bt_9: showString += "9"; break; case R.id.bt_plus: if (showString.equals("")) exception = "先輸入數(shù)值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "+"; } break; case R.id.bt_sub: if (showString.equals("")) exception = "先輸入數(shù)值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "-"; } break; case R.id.bt_mutilate: if (showString.equals("")) exception = "先輸入數(shù)值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "*"; } break; case R.id.bt_div: if (showString.equals("")) exception = "先輸入數(shù)值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "/"; } break; case R.id.bt_equ: if (option.equals("+")) showString = showfirst + Integer.parseInt(showString) + ""; else if (option.equals("-")) { showString = showfirst - Integer.parseInt(showString) + ""; } else if (option.equals("*")) { showString = showfirst * Integer.parseInt(showString) + ""; } else if (option.equals("/")) { if (showString.equals("0")) { exception = "除數(shù)不能為0!"; } else showString = showfirst / Integer.parseInt(showString) + ""; } break; case R.id.bt_c: showString = ""; break; case R.id.iv_delete: Toast.makeText(MainActivity.this, showString + "已被清空", Toast.LENGTH_SHORT).show(); showString = ""; break; case R.id.author: Toast.makeText(MainActivity.this, "鄭明亮\n軟件工程\nQQ:1072307340", Toast.LENGTH_SHORT).show(); break; default: break; } if (exception.equals("")) show.setText(showString); else { show.setText(exception); exception = ""; } // 設(shè)置文本框顏色; if (!show.getText().toString().equals("")) { delete.setBackgroundColor(R.drawable.delete_gray); } else { delete.setBackgroundResource(R.drawable.delete); } } }
再貼布局activity_main.xml:
<LinearLayout 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" android:orientation="vertical" tools:context="com.example.calculator.MainActivity" > <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <EditText android:id="@+id/et_show" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="請輸入數(shù)字" /> <ImageView android:id="@+id/iv_delete" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@id/et_show" android:src="@drawable/delete_and_deletegray" > </ImageView> </RelativeLayout> <GridLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@+id/et_show" android:focusable="false" android:gravity="center" android:layout_marginTop="25dp" android:columnCount="4" android:horizontalSpacing="0dp" android:orientation="horizontal" android:stretchMode="none" > <Button android:id="@+id/bt_1" android:layout_height="wrap_content" android:text="1" /> <Button android:id="@+id/bt_2" android:text="2" /> <Button android:id="@+id/bt_3" android:text="3" /> <Button android:id="@+id/bt_div" android:text="/" /> <Button android:id="@+id/bt_4" android:text="4" /> <Button android:id="@+id/bt_5" android:text="5" /> <Button android:id="@+id/bt_6" android:text="6" /> <Button android:id="@+id/bt_mutilate" android:text="X" /> <Button android:id="@+id/bt_7" android:text="7" /> <Button android:id="@+id/bt_8" android:text="8" /> <Button android:id="@+id/bt_9" android:text="9" /> <Button android:id="@+id/bt_sub" android:text="-" /> <Button android:id="@+id/bt_0" android:layout_columnSpan="2" android:layout_gravity="fill_horizontal" android:text="0" android:width="2dp" /> <Button android:id="@+id/bt_c" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="C" /> <Button android:id="@+id/bt_plus" android:layout_gravity="fill_vertical" android:layout_rowSpan="2" android:text="+" /> <Button android:id="@+id/bt_equ" android:layout_columnSpan="3" android:layout_gravity="fill_horizontal" android:text="=" /> </GridLayout> <TextView android:id="@+id/author" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Author:Bri" /> <TextView android:id="@+id/test" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="test:www.jb51.net" /> </LinearLayout>
我還寫了一個drawable的xml,自己看吧
delete_and_deletegray.xml:
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/delete_gray" android:state_focused="false" android:state_pressed="false"></item> <item android:drawable="@drawable/delete" android:state_focused="false" android:state_pressed="false" android:state_selected="true"/> <item android:drawable="@drawable/delete" android:state_pressed="true" android:state_selected="false"/> <item android:drawable="@drawable/delete" android:state_focused="true" android:state_pressed="true"/> </selector>
以上就是“Android開發(fā)怎么實現(xiàn)計算器功能”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家閱讀完這篇文章都有很大的收獲,小編每天都會為大家更新不同的知識,如果還想學(xué)習(xí)更多的知識,請關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
文章標題:Android開發(fā)怎么實現(xiàn)計算器功能-創(chuàng)新互聯(lián)
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