android

package com.digitas.weight;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.RadioButton;public class Weight extends Activity { private EditText heightEdit; private RadioButton maleRadio; private RadioButton femaleRadio; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //加载 main.xml 布局和各个元素 setContentView(R.layout.main); heightEdit = (EditText) findViewById(R.id.heightEdit); maleRadio = (RadioButton) findViewById(R.id.maleRadio); femaleRadio = (RadioButton) findViewById(R.id.femaleRadio); //以findViewById()取得Button对象，并加入onClickListener Button doButton = (Button) findViewById(R.id.doButton); doButton.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {//取得输入身高double height = Double.parseDouble(heightEdit.getText().toString());//取得性别String sex = "";if(maleRadio.isChecked()){sex = "m";}if(femaleRadio.isChecked()){sex = "f";}//新建一个Intent对象,并指定传递的classIntent intent = new Intent();intent.setClass(Weight.this, WeightResult.class);//新建一个Bundle对象，并设置要传递的数据Bundle bundle = new Bundle(); bundle.putDouble("height", height); bundle.putString("sex", sex); //绑定数据到Intent intent.putExtras(bundle); //调用Activity WeightResult,第二个参数为requestCode startActivityForResult(intent, 0);} }); } //重写 onActivityResult 方法 @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent){ switch (resultCode) { case RESULT_OK: //取得数据，并重新显示到画面上 Bundle bunde = intent.getExtras(); String sex = bunde.getString("sex"); double height = bunde.getDouble("height"); heightEdit.setText(height + ""); if(sex.equals("m")){ maleRadio.setChecked(true); } if(sex.equals("f")){ femaleRadio.setChecked(true); } break; default: break; } } }