简陋计算器
1 public class FActivity extends Activity implements OnClickListener{ 2 Button btn_0; 3 Button btn_1; 4 Button btn_2; 5 Button btn_3; 6 Button btn_4; 7 Button btn_5; 8 Button btn_6; 9 Button btn_7; 10 Button btn_8; 11 Button btn_9; 12 Button btn_point; 13 Button btn_clear; 14 Button btn_delete; 15 Button btn_add; 16 Button btn_minus; 17 Button btn_multiple; 18 Button btn_divide; 19 Button btn_equal; 20 private EditText et; 21 String string; 22 Boolean flag=false; 23 @Override 24 protected void onCreate(Bundle savedInstanceState) { 25 // TODO Auto-generated method stub 26 super.onCreate(savedInstanceState); 27 setContentView(R.layout.factivity); 28 29 btn_0=(Button) findViewById(R.id.button_0); 30 btn_1=(Button) findViewById(R.id.button_1); 31 btn_2=(Button) findViewById(R.id.button_2); 32 btn_3=(Button) findViewById(R.id.button_3); 33 btn_4=(Button) findViewById(R.id.button_4); 34 btn_5=(Button) findViewById(R.id.button_5); 35 btn_6=(Button) findViewById(R.id.button_6); 36 btn_7=(Button) findViewById(R.id.button_7); 37 btn_8=(Button) findViewById(R.id.button_8); 38 btn_9=(Button) findViewById(R.id.button_9); 39 btn_point=(Button) findViewById(R.id.button_point); 40 btn_divide=(Button) findViewById(R.id.button_divide); 41 btn_add=(Button) findViewById(R.id.button_add); 42 btn_minus=(Button) findViewById(R.id.button_minus); 43 btn_multiple=(Button) findViewById(R.id.button_multiple); 44 btn_delete=(Button) findViewById(R.id.button_delete); 45 btn_equal=(Button) findViewById(R.id.button_equal); 46 btn_clear=(Button) findViewById(R.id.button_clear); 47 et=(EditText) findViewById(R.id.editText1); 48 49 btn_0.setOnClickListener(this); 50 btn_1.setOnClickListener(this); 51 btn_2.setOnClickListener(this); 52 btn_3.setOnClickListener(this); 53 btn_4.setOnClickListener(this); 54 btn_5.setOnClickListener(this); 55 btn_6.setOnClickListener(this); 56 btn_7.setOnClickListener(this); 57 btn_8.setOnClickListener(this); 58 btn_9.setOnClickListener(this); 59 btn_point.setOnClickListener(this); 60 btn_delete.setOnClickListener(this); 61 btn_add.setOnClickListener(this); 62 btn_minus.setOnClickListener(this); 63 btn_multiple.setOnClickListener(this); 64 btn_divide.setOnClickListener(this); 65 btn_equal.setOnClickListener(this); 66 btn_clear.setOnClickListener(this); 67 68 69 } 70 @Override 71 public void onClick(View v) { 72 string=et.getText().toString(); 73 74 switch (v.getId()) { 75 case R.id.button_0: 76 case R.id.button_1: 77 case R.id.button_2: 78 case R.id.button_3: 79 case R.id.button_4: 80 case R.id.button_5: 81 case R.id.button_6: 82 case R.id.button_7: 83 case R.id.button_8: 84 case R.id.button_9: 85 case R.id.button_point: 86 { 87 if (flag){ 88 flag=false; 89 string=""; 90 91 } 92 et.setText(string+((Button)v).getText()); 93 94 break; 95 } 96 case R.id.button_add: 97 case R.id.button_minus: 98 case R.id.button_multiple: 99 case R.id.button_divide: 100 { 101 et.setText(string+" "+((Button)v).getText()+" "); 102 103 break; 104 } 105 case R.id.button_clear: 106 { 107 et.setText(""); 108 109 break; 110 } 111 case R.id.button_delete: 112 { 113 if (!string.equals("")){ 114 string=string.substring(0,string.length()-1); 115 et.setText(string); 116 117 } 118 break; 119 } 120 case R.id.button_equal: 121 { 122 getResult(); 123 break; 124 } 125 } 126 } 127 private void getResult(){ 128 string=et.getText().toString(); 129 Double result=(double) 0; 130 if (string=="") 131 return; 132 if (!string.contains(" ")) 133 return; 134 if (flag){ 135 // flag=false; 136 return; 137 } 138 flag=true; 139 String s1=string.substring(0,string.indexOf(" ")); 140 String op=string.substring(string.indexOf(" ")+1,string.indexOf(" ")+2); 141 String s2=string.substring(string.indexOf(" ")+3); 142 143 double num1=Double.parseDouble(s1); 144 double num2=Double.parseDouble(s2); 145 146 147 if (!s1.equals("")&&!s2.equals("")){ 148 if (op.equals("+")){ 149 result=num1+num2; 150 } 151 if (op.equals("-")){ 152 result=num1-num2; 153 154 } 155 if (op.equals("*")){ 156 result=num1*num2; 157 158 } 159 if (op.equals("÷")){ 160 if (num2!=0) 161 result=num1/num2; 162 else 163 result=0.0; 164 165 } 166 }else if (s1.equals("")&&!s2.equals("")){ 167 result=num2; 168 }else if (!s1.equals("")&&s2.equals("")){ 169 result=num1; 170 } 171 172 et.setText(result+""); 173 } 174 175 }
intent传递
