Button.OnClickListener是什么意思呢？
private Button.OnClickListener calcBMI = new Button.OnClickListener()看不懂？
package com.demo.android.bmi;
import java.text.DecimalFormat;
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 Bmi extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViews();
setListensers();
}
private Button button_calc;
private EditText field_height;
private EditText field_weight;
private TextView view_result;
private TextView view_suggest;
private void findViews()
{
button_calc = (Button)findViewById(R.id.submit);
field_height = (EditText)findViewById(R.id.height);
field_weight = (EditText)findViewById(R.id.weight);
view_result = (TextView)findViewById(R.id.result);
view_suggest = (TextView)findViewById(R.id.suggest);
}
private void setListensers()
{
button_calc.setOnClickListener(calcBMI);
}
//?
private Button.OnClickListener calcBMI = new Button.OnClickListener()
{
public void onClick(View arg0)
{
DecimalFormat nf = new DecimalFormat("0.00");
double height = Double.parseDouble(field_height.getText().toString())/100;
double weight = Double.parseDouble(field_weight.getText().toString());
double BMI = weight / (height * height);
view_result.setText(getText(R.string.bmi_result) + nf.format(BMI));
//Give health advice
if (BMI > 25)
{
view_suggest.setText(R.string.advice_heavy);
}
else if (BMI < 20)
{
view_suggest.setText(R.string.advice_light);
}
else
{
view_suggest.setText(R.string.advice_average);
}
}
};
}
