Android開發簡單計算機

介面

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(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtvFH.setText(btnJia.getText());    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())+Integer.parseInt(et2.getText().toString())));}                });        //減        btnJian.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtvFH.setText(btnJian.getText());    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())-Integer.parseInt(et2.getText().toString())));}                });        //乘以        btnCheng.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtvFH.setText(btnCheng.getText());    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())*Integer.parseInt(et2.getText().toString())));}                });        //除以        btnChu.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtvFH.setText(btnChu.getText());    tvResult.setText(Integer.toString(Integer.parseInt(et1.getText().toString())/Integer.parseInt(et2.getText().toString())));}                });    }}

運行結果