[Android UI 教學(6)] 總和計算應用程式

1. 建立新專案

2. 刪除預設的TextView

3. 新增2個EditText, 1個Button, 1個TextView

4. 修改Text屬性

5. 輸入程式

package com.example.sum;

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;
import android.widget.TextView;

public class SumActivity extends Activity {
    /** Called when the activity is first created. */

 EditText et1, et2;
 Button bt;
 TextView tv;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        et1 = (EditText) findViewById(R.id.EditText01);
        et2 = (EditText) findViewById(R.id.EditText02);
        tv = (TextView) findViewById(R.id.TextView01);
        bt = (Button) findViewById(R.id.Button01);
        bt.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    double d1,d2;
    d1 = Double.parseDouble(et1.getText().toString());
    d2 = Double.parseDouble(et2.getText().toString());
    tv.setText(Double.toString(d1+d2));
   }
         
        });

    }
}

6. 執行結果