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我的当前源代码有问题。我对此很新。这是关于BMI计算，并将通过使用alertdialog显示输出。我已经提出了条件，但在其他条件下输出始终是“您超越”，即使我的输入是合法的应该是IDEAL输出。BMI计算，使用alertdialog输出
活动没有在运行中的错误，但我有一种感觉，这是我不知道的计算问题。如果这是一个重复的问题，我真的很抱歉。
public class BMIcalcu extends Activity{
EditText weight, height;
final Context context = this;
Button calculate;
float result, height1, weight1;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.bmi_calcu);
height = (EditText)findViewById(R.id.editText1);
weight = (EditText)findViewById(R.id.editText2);
calculate = (Button)findViewbyId(R.id.btn_bmi);
String str1 = height.getText().toString();
String str2 = weight.getText().toString();
try{
height1 = Float.parseFloat(str1)/100;
weight1 = Float.parseFloat(str2);
}catch(NumberFormatException nfe){
}
calculate.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
result = weight1/(height1*height1);
if(result<18.5){
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setTitle("Your BMI");
alertDialogBuilder
.setMessage("You are UNDERWEIGHT! START EATING!")
.setCancelable(false)
.setPositiveButton("List", new DialogInterface.OnClickLister(){
public void onClick(DialogInterface dialog, int id){
Intent intent = new Intent(BMIcalcu.this, list.class);
startActivity(intent);
}
})
.setNegativeButton("Back", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
else if(result<25){
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setTitle("Your BMI");
alertDialogBuilder
.setMessage("You are on your IDEAL!")
.setCancelable(false)
.setPositiveButton("List", new DialogInterface.OnClickLister(){
public void onClick(DialogInterface dialog, int id){
Intent intent = new Intent(BMIcalcu.this, list.class);
startActivity(intent);
}
})
.setNegativeButton("Back", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
else{
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setTitle("Your BMI");
alertDialogBuilder
.setMessage("You are OVERWEIGHT! START EXERCISING!")
.setCancelable(false)
.setPositiveButton("List", new DialogInterface.OnClickLister(){
public void onClick(DialogInterface dialog, int id){
Intent intent = new Intent(BMIcalcu.this, list.class);
startActivity(intent);
}
})
.setNegativeButton("Back", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
}
});
}
}
这是XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_gravity="center"
android:layout_width="266dp"
android:layout_height="wrap_content"
android:inputType="text|number"
android:hint="Height (Centimeter)"
android:ems="10"
android:id="@+id/editText1" />
<EditText
android:layout_gravity="center"
android:layout_width="266dp"
android:layout_height="wrap_content"
android:inputType="text|number"
android:hint="Weight (Kilogram)"
android:ems="10"
android:id="@+id/editText2"/>
<Button
android:id="@+id/btn_bmi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_below="@+id/editText2"
android:text="Calculate"/>
</LinearLayout>
你的代码看起来不错，你可以举一个例子，根据你是正确的，但不通过代码工作？ – Sanjeet
我输入157为高度，50为重量。这将是20作为bmi（理想）。但它仍然打印为“超重” –
我建议您使用调试来浏览您的代码并查看变量的值。 –