android简单计算器代码.doc

package hua.xing.demo;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class CalculatordemoActivity extends Activity implements OnClickListener /* Called when the activity is first created. */private Button but0 = null;private Button but1 = null;private Button but2 = null;private Button but3 = null;private Button but4 = null;private Button but5 = null;private Button but6 = null;private Button but7 = null;private Button but8 = null;private Button but9 = null;private Button dim = null;private Button add = null;private Button sub = null;private Button mult = null;private Button div = null;private Button equ = null;private EditText etext = null;private double value = 0;private String str1 = null;private String tem = ;private String sign = a;Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);super.setContentView(R.layout.main);add = (Button) findViewById(R.id.add);sub = (Button) findViewById(R.id.sub);mult = (Button) findViewById(R.id.mult);div = (Button) findViewById(R.id.divid);equ = (Button) findViewById(R.id.caculate);but1 = (Button) findViewById(R.id.but1);but3 = (Button) findViewById(R.id.but3);but2 = (Button) findViewById(R.id.but2);but4 = (Button) findViewById(R.id.but4);but5 = (Button) findViewById(R.id.but5);but6 = (Button) findViewById(R.id.but6);but7 = (Button) findViewById(R.id.but7);but8 = (Button) findViewById(R.id.but8);but9 = (Button) findViewById(R.id.but9);but0 = (Button) findViewById(R.id.but0);dim = (Button) findViewById(R.id.dim);etext = (EditText) findViewById(R.id.etext);add.setOnClickListener(new AListener();sub.setOnClickListener(new AListener();mult.setOnClickListener(new AListener();div.setOnClickListener(new AListener();equ.setOnClickListener(new Listener();but1.setOnClickListener(this);but3.setOnClickListener(this);but2.setOnClickListener(this);but4.setOnClickListener(this);but5.setOnClickListener(this);but6.setOnClickListener(this);but7.setOnClickListener(this);but8.setOnClickListener(this);but9.setOnClickListener(this);but0.setOnClickListener(this);dim.setOnClickListener(this);Overridepublic void onClick(View v) / TODO Auto-generated method stubif (v.equals(but1) tem = tem + 1;etext.setText(tem);if (v.equals(but2) tem = tem + 2;etext.setText(tem);if (v.equals(but3) tem = tem + 3;etext.setText(tem);if (v.equals(but4) tem = tem + 4;etext.setText(tem);if (v.equals(but5) tem = tem + 5;etext.setText(tem);if (v.equals(but6) tem = tem + 6;etext.setText(tem);if (v.equals(but7) tem = tem + 7;etext.setText(tem);if (v.equals(but8) tem = tem + 8;etext.setText(tem);if (v.equals(but9) tem = tem + 9;etext.setText(tem);if (v.equals(but0) tem = tem + 0;etext.setText(tem);class AListener implements OnClickListener Overridepublic void onClick(View arg) / TODO Auto-generated method stubstr1 = etext.getText().toString();if (str1.equals() else double d = Double.parseDouble(str1);if (sign = a) value = d;if (sign = *) value = value * d;if (sign = -) value = value - d;if (sign = /) value = value / d;if (sign = +) value = d + value;etext.setText();if (arg.equals(add) sign = +;if (arg.equals(div) sign = /;if (arg.equals(mult) sign = *;if (arg.equals(sub) sign = -;tem = ;class Listener implements OnClickListener Overridepublic void onClick(View arg) / TODO Auto-generated method stubstr1 = etext.getText().toString();if (str1.equals() else double d = Double.parseDouble(str1);if (sign = a) valu