菜鸟求助啊！！！！！
package com.examplebmi;import java.text.DecimalFormat;
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 MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button=(Button)findViewById(R.id.submit);
button.setOnClickListener(calcBMI);
}
public void setContentView(View main) {
// TODO Auto-generated method stub
}
private OnClickListener calcBMI=new OnClickListener()
{public void onClick(View V)
{
DecimalFormat nf=new DecimalFormat("0.00");
EditText fieldheight=(EditText)findViewById(R.id.height);
EditText fieldweight=(EditText)findViewById(R.id.weight);
double height=Double.parseDouble(fieldheight.getText().toString())/100;
double weight=Double.parseDouble(fieldweight.getText().toString());
double BMI=weight/(height*height);
TextView result=(TextView)findViewById(R.id.result);
result.setText("Your BMI is "+nf.format(BMI));
TextView fieldsuggest=(TextView)findViewById(R.id.suggest);
if(BMI>25)
{
fieldsuggest.setText(R.string.advice_heavy);
}
else if (BMI<20)
{fieldsuggest.setText(R.string.advice_light);
}
else
{fieldsuggest.setText(R.string.advice_average);
}
}
};
public EditText findViewById(int height) {
// TODO Auto-generated method stub
return null;
}
}
求助，运行时候红字部份出现错误“Cannot cast from EditText to Button”，什么问题，怎么解决？ --------------------编程问答-------------------- 说明你的布局文件上的id搞错了
检查下 --------------------编程问答-------------------- R.id.submit 这是个 edittext？ --------------------编程问答-------------------- 你的这个ID是EditText的ID。。控件名可能错啦。 --------------------编程问答-------------------- <EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="19dp"
android:ems="10"
android:inputType="text" />
<Button android:id="@+id/submit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="计算BMI值"
/>
哪里错了？？？
刚学实在不懂！
--------------------编程问答--------------------
哪里错了，刚学实在不懂啊！ --------------------编程问答-------------------- clean project
save files
Build & run
补充：移动开发 , Android
