android简单计算器代码

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"; @Override public 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 AListe...