作业在android studio中。我需要制作一个BMI计算器。我还需要使用一个片段,到目前为止我只有这个问题但是当我点击我的计算器按钮时,我的setText()没有显示答案。我相信这很简单,但我是新手,所以任何帮助都会受到赞赏。
package jrodriguez.bmicalculator;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class BMIFragment extends Fragment{
EditText weightT;
EditText heightT;
TextView out;
Button btnBMI;
public BMIFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_bmi, container, false);
weightT = (EditText)v.findViewById(R.id.weightEditText);
heightT = (EditText)v.findViewById(R.id.heightEditText);
out = (TextView)v.findViewById(R.id.veredictTextView);
btnBMI=(Button)v.findViewById(R.id.computeBMIButton);
btnBMI.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
computeBMI(v);
}
});
return v;
}
public void computeBMI(View v){
double w = Double.valueOf(weightT.getText().toString());
double h = Double.valueOf(heightT.getText().toString());
out.setText(""+703*w/(h*h));
}
}
这是我的片段xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/weightEditText"
android:hint="@string/weight" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/heightEditText"
android:hint="@string/height" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/computeBMIButton"
android:id="@+id/computeBMIButton"
android:enabled="true"
android:clickable="true"
android:contextClickable="true"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/veredictTextView"
android:editable="true"
android:enabled="true"
android:elegantTextHeight="false"
android:text=""/>
</LinearLayout>
答案 0 :(得分:1)
试试这个解决方案
public void computeBMI(View v){
double w = Double.valueOf(weightT.getText().toString());
double h = Double.valueOf(heightT.getText().toString());
double bmiResult = 703 * (w / (h * h));
out.setText(String.valueOf(bmiResult));
}
答案 1 :(得分:1)
从Button
和Textview
中删除不必要的标记。按钮始终可以点击,editable
属性不会与Textview
一起使用。其中一个标记是阻止listener
运行。