Android开发简单计算器

界面如图

src/Ex03_16.java

package gphone.EX03_16;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class EX03_16 extends Activity {
	EditText et1=null;
	EditText et2=null;
	Button btnJia=null;
	Button btnJian=null;
	Button btnCheng=null;
	Button btnChu=null;
	TextView tvFH=null;
	TextView tvResult=null;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        et1=(EditText)findViewById(R.id.et1);
        et2=(EditText)findViewById(R.id.et2);
        btnJia=(Button)findViewById(R.id.btnJia);
        btnJian=(Button)findViewById(R.id.btnJian);
        btnCheng=(Button)findViewById(R.id.btnCheng);
        btnChu=(Button)findViewById(R.id.btnChu);
        tvFH=(TextView)findViewById(R.id.tvFH);
        tvResult=(TextView)findViewById(R.id.tvResult);
       //加
        btnJia.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				tvFH.setText(btnJia.getText());
			    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())+Integer.parseInt(et2.getText().toString())));
			}
        	
        });
        //减
        btnJian.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				tvFH.setText(btnJian.getText());
			    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())-Integer.parseInt(et2.getText().toString())));
			}
        	
        });
        //乘以
        btnCheng.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				tvFH.setText(btnCheng.getText());
			    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())*Integer.parseInt(et2.getText().toString())));
			}
        	
        });
        //除以
        btnChu.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				tvFH.setText(btnChu.getText());
			    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())/Integer.parseInt(et2.getText().toString())));
			}
        	
        });
    }
}

运行结果