实现加减乘除等简单计算的Android计算器源码包

package ymq.demo03; import android.app.Activity; import android.os.Bundle; import android.view.*; import android.widget.*; public class demo03 extends Activity { /** Called when the activity is first created. */ String str=""; EditText et; int c=0,flag=0; double b=0.0,g=0.0,f=0.0; View vi; public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub menu.add(0, 1, 1, "退出"); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub if(item.getItemId()==1){finish();} return super.onOptionsItemSelected(item); } //计算方法 public double calculater(){ switch(c){ case 0:f=g;break; case 1:f=b+g;break; case 2:f=b-g;break; case 3:f=b*g;break; case 4:f=b/g;break; } b=f; c=0; return f; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //获得按键 final Button number[]=new Button[10]; final Button fuhao[]=new Button[11]; fuhao[0]=(Button)findViewById(R.id.button01); fuhao[1]=(Button)findViewById(R.id.button02); fuhao[2]=(Button)findViewById(R.id.button03); fuhao[3]=(Button)findViewById(R.id.button04); fuhao[4]=(Button)findViewById(R.id.button05); fuhao[5]=(Button)findViewById(R.id.button06); fuhao[6]=(Button)findViewById(R.id.buttonce); fuhao[7]=(Button)findViewById(R.id.buttonc); fuhao[8]=(Button)findViewById(R.id.zheng); fuhao[9]=(Button)findViewById(R.id.kaifang); fuhao[10]=(Button)findViewById(R.id.pingfang); number[0]=(Button)findViewById(R.id.button0); number[1]=(Button)findViewById(R.id.button1); number[2]=(Button)findViewById(R.id.button2); number[3]=(Button)findViewById(R.id.button3); number[4]=(Button)findViewById(R.id.button4); number[5]=(Button)findViewById(R.id.button5); number[6]=(Button)findViewById(R.id.button6); number[7]=(Butto