Android计算器小软件源码（一）

package edu.zone.sun.calc; import java.text.DecimalFormat; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class Calc extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); findView(); //Listen for button clicks setListener(); } private EditText fieldfirst; private EditText fieldsecond; private TextView result; private Button button; private DecimalFormat df; private double first; private double second; private double sum; private void setListener() { button.setOnClickListener(CalcB); } private void findView() { fieldfirst=(EditText)findViewById(R.id.first); fieldsecond=(EditText)findViewById(R.id.second); button=(Button)findViewById(R.id.button); } private OnClickListener CalcB=new OnClickListener() { @Override public void onClick(View v) { df=new DecimalFormat("0.00"); first=Double.parseDouble(fieldfirst.getText().toString()); second=Double.parseDouble(fieldsecond.getText().toString()); sum=first+second; result=(TextView)findViewById(R.id.result); //result.setText("你的计算结果是:"+df.format(sum)); result.setText(getText(R.string.calcresult)+df.format(sum)); //R.string.calcresult不能和数字连接 openOptionsDialog(); } }; //计算结果后，弹出对话框（通过AlertDialog实现的） private void openOptionsDialog(){ new AlertDialog.Builder(Calc.this) .setTitle(R.string.about) .setMessage(R.string.message) .setPositiveButton(R.string.label_ok,new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }) .show(); } }