AndroidStudio编写简易计算器App(Java语言版)

2023年12月21日发(作者：宝骏560手动挡价格)

textSize=\"40dp\"text=\"\"textDirection=\"rtl\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"%\"textSize=\"30dp\"onClick=\"surplus\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"CE\"textSize=\"30dp\"onClick=\"clearce\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"C\"textSize=\"30dp\"onClick=\"clearc\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"?\"textSize=\"30dp\"onClick=\"backsprce\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"1/x\"textSize=\"30dp\"onClick=\"reciprocal\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"x?\"textSize=\"30dp\"onClick=\"square\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"?√x\"textSize=\"30dp\"onClick=\"squareroot\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"÷\"textSize=\"60dp\"onClick=\"division\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"7\"textSize=\"30dp\"onClick=\"number_7\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"8\"textSize=\"30dp\"onClick=\"number_8\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"9\"textSize=\"30dp\"onClick=\"number_9\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"×\"textSize=\"30dp\"onClick=\"multiplication\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"4\"textSize=\"30dp\"onClick=\"number_4\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"5\"textSize=\"30dp\"onClick=\"number_5\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"6\"textSize=\"30dp\"onClick=\"number_6\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"－\"textSize=\"30dp\"onClick=\"subtraction\"/>

layout_width=\"match_parent\"layout_height=\"0dp\"layout_weight=\"1\"orientation=\"horizontal\">

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"1\"textSize=\"30dp\"onClick=\"number_1\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"2\"textSize=\"30dp\"onClick=\"number_2\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"3\"textSize=\"30dp\"onClick=\"number_3\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"＋\"textSize=\"30dp\"onClick=\"addition\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"text=\"±\"textSize=\"30dp\"onClick=\"change\"/>

layout_width=\"match_parent\"layout_height=\"match_parent\"

// index = f(c).length();// t(viewStr); } //A + B

字符串形

改变 B

正负值 if (inde >= 0 && inde < index) { clearc(view); b = (a)[0]; int c = - nt((a)[1]); (b).append(a).append(f(c)); index = f(c).length(); t(viewStr); } } //清空按钮事件 public void clearc(View view) { StringBuilder temp = new StringBuilder(); viewStr = (\"\"); t(viewStr); index = 0; } public void clearce(View view) { StringBuilder temp = new StringBuilder(); viewStr = (\"\"); t(\"\"); t(viewStr); index = 0; } //等于按钮事件 public void equal(View view) { String[] asmd = {\"＋\",\"－\",\"×\",\"÷\",\"%\"}; StringBuilder temp = new StringBuilder(); for (int i = 0; i < 5; i ++) { int inde = f(asmd[i]); if (inde > 0 && inde != index-1) { t(calc(viewStr)); String a = calc(viewStr); viewStr = (a); t(viewStr); index = (); return; }else if (inde > 0 && inde == index-1) { CharAt(--index); t(viewStr); t(viewStr); } } t(viewStr); t(viewStr); } //加减乘除按钮事件 public void addition(View view) { if (() == 0) return; String[] asmd = {\"＋\",\"－\",\"×\",\"÷\",\"%\"}; StringBuilder temp = new StringBuilder(); for (int i = 0; i < 5; i ++) { int inde = f(asmd[i]); if (inde > 0 && (index-1) >= \'0\' && (index-1) <= \'9\') { t(calc(viewStr)); String a = calc(viewStr); viewStr = (a).append(\'＋\'); t(viewStr); index = ();

return; } } char a = (index-1); if (a == \'＋\') { return; } if (a == \'－\' || a == \'×\' || a == \'÷\' || a == \'%\') { rAt(index-1,\'＋\'); }else { (\"＋\"); index ++ ; } t(viewStr); } public void subtraction(View view) { if (() == 0) return; String[] asmd = {\"＋\",\"－\",\"×\",\"÷\",\"%\"}; StringBuilder temp = new StringBuilder(); for (int i = 0; i < 5; i ++) { int inde = f(asmd[i]); if (inde > 0 && (index-1) >= \'0\' && (index-1) <= \'9\') { t(calc(viewStr)); String a = calc(viewStr); viewStr = (a).append(\'－\'); t(viewStr); index = (); return; } } char a = (index-1); if (a == \'－\') { return; } if (a == \'＋\' || a == \'×\' || a == \'÷\' || a == \'%\') { rAt(index-1,\'－\'); }else { (\"－\"); index ++ ; } t(viewStr); } public void multiplication(View view) { if (() == 0) return; String[] asmd = {\"＋\",\"－\",\"×\",\"÷\",\"%\"}; StringBuilder temp = new StringBuilder(); for (int i = 0; i < 5; i ++) { int inde = f(asmd[i]); if (inde > 0 && (index-1) >= \'0\' && (index-1) <= \'9\') { t(calc(viewStr)); String a = calc(viewStr); viewStr = (a).append(\'×\'); t(viewStr); index = (); return; } } char a = (index-1); if (a == \'×\') { return; } if (a == \'＋\' || a == \'－\' || a == \'÷\' || a == \'%\') { rAt(index-1,\'×\'); }else { (\"×\"); index ++ ; } t(viewStr); } public void division(View view) { if (() == 0) return;

String[] asmd = {\"＋\",\"－\",\"×\",\"÷\",\"%\"}; StringBuilder temp = new StringBuilder(); for (int i = 0; i < 5; i ++) { int inde = f(asmd[i]); if (inde > 0 && (index-1) >= \'0\' && (index-1) <= \'9\') { t(calc(viewStr)); String a = calc(viewStr); viewStr = (a).append(\'÷\'); t(viewStr); index = (); return; } } char a = (index-1); if (a == \'÷\') { return; } if (a == \'＋\' || a == \'－\' || a == \'×\' || a == \'%\') { rAt(index-1,\'÷\'); }else { (\"÷\"); index ++ ; } t(viewStr); } //求余按钮事件 public void surplus(View view) { if (() == 0) return; String[] asmd = {\"＋\",\"－\",\"×\",\"÷\",\"%\"}; StringBuilder temp = new StringBuilder(); for (int i = 0; i < 5; i ++) { int inde = f(asmd[i]); if (inde > 0 && (index-1) >= \'0\' && (index-1) <= \'9\') { t(calc(viewStr)); String a = calc(viewStr); viewStr = (a).append(\'%\'); t(viewStr); index = (); return; } } char a = (index-1); if (a == \'%\') { return; } if (a == \'＋\' || a == \'－\' || a == \'×\' || a == \'÷\') { rAt(index-1,\'%\'); }else { (\"%\"); index ++ ; } t(viewStr); } //求倒数按钮事件 public void reciprocal(View view) { if (() == 0) return; String[] asmd = {\"＋\",\"－\",\"×\",\"÷\",\"%\"}; for (int i = 0; i < 5; i ++) { int inde = f(asmd[i]); if (inde > -1) { return; } } int a = nt(ng().trim()); if (a == 0) { xt(this,\"0不能为除数\",_SHORT).show(); return; } clearc(view);