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所以这是我第一个没有遵循教程的应用程序。我已经把所有的xml都布置好了，spinner下来工作也是第一次由EditText数字完成的计算工作。 我现在想用这首计算的答案与微调选择值的一个一起做下计算 这里是我的xml如何将微调值与以前计算的答案一起添加到新计算中？
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<EditText
android:id="@+id/inside"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_weight="1"
android:ems="10"
android:inputType="number"
android:gravity="center" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="Inside Ø \n(mm)"
android:textSize="16dp" />
</LinearLayout>
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_marginTop="16dp"
android:background="@android:color/darker_gray" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<EditText
android:id="@+id/outside"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_weight="1"
android:ems="10"
android:inputType="number"
android:gravity="center" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="Outside Ø \n(mm)"
android:textSize="16dp" />
</LinearLayout>
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_marginTop="16dp"
android:background="@android:color/darker_gray" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<EditText
android:id="@+id/coils"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_weight="1"
android:ems="10"
android:inputType="number"
android:gravity="center"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="Number of Coils"
android:textSize="16dp" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="16dp">
<Spinner
android:id="@+id/thickness"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="8dp"
android:layout_weight="1"
android:background="@android:drawable/btn_dropdown"
android:spinnerMode="dropdown" />
<Spinner
android:id="@+id/width"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_weight="1"
android:background="@android:drawable/btn_dropdown"
android:spinnerMode="dropdown" />
</LinearLayout>
<Button
android:id="@+id/bt_calculate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:onClick="calculate"
android:text="Calculate" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="24dp">
<TextView
android:id="@+id/result_m"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="24dp">
<TextView
android:id="@+id/result_kg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="24dp"
android:layout_marginRight="24dp">
<TextView
android:id="@+id/result_m2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
<Button
android:id="@+id/clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="24dp"
android:layout_gravity="center_horizontal"
android:onClick="clear"
android:text="Clear" />
这里是代码
package com.example.android.engineerstoolbox;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import static com.example.android.engineerstoolbox.R.id.result_kg;
import static com.example.android.engineerstoolbox.R.id.result_m;
import static com.example.android.engineerstoolbox.R.id.result_m2;
public class CoilCalculator extends AppCompatActivity {
private EditText editText1;
private EditText editText2;
private EditText editText3;
private Spinner spinner1;
private Spinner spinner2;
private TextView resultM;
private TextView resultKG;
private TextView resultM2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_coil_calculator);
//set spinner1 for user input of available thickness
Spinner dropdown = (Spinner) findViewById(R.id.thickness);
String[] items = new String[]{"Thickness", "1.2", "1.5", "2", "2.5", "3", "4"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, items);
dropdown.setAdapter(adapter);
//set spinner2 for user input of available width
dropdown = (Spinner) findViewById(R.id.width);
items = new String[]{"Width", "1219", "1500", "1524"};
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, items);
dropdown.setAdapter(adapter);
editText1 = (EditText) findViewById(R.id.inside);
editText2 = (EditText) findViewById(R.id.outside);
editText3 = (EditText) findViewById(R.id.coils);
resultM = (TextView) findViewById(result_m);
resultKG = (TextView) findViewById(result_kg);
resultM2 = (TextView) findViewById(result_m2);
//Set button to do calculations
Button bt_calculate = (Button) findViewById(R.id.bt_calculate);
bt_calculate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
makeCalculations();
}
});
//Set reset button to reset inputs
Button mButtonReset = (Button) findViewById(R.id.clear);
mButtonReset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
editText1.setText("");
editText2.setText("");
editText3.setText("");
resultM.setText("");
}
});
}
private void makeCalculations() {
double n1 = Double.valueOf(editText1.getText().toString());
double n2 = Double.valueOf(editText2.getText().toString());
double n3 = Double.valueOf(editText3.getText().toString());
//do the Lineal meter calculation
Double calculatedValue = ((((n1 + n2)/2) * 3.141592654) * n3)/1000;
double output = (double) Math.round(calculatedValue * 1000)/1000;
//set the value to the textview, to display on screen.
resultM.setText(output + " Lineal Meters");
}
}
我知道我需要设置某种侦听器来获取微调器值;但我不确定在哪里，到目前为止，我还没有在这里找到一个问题，解释了代码的放置位置。
下一个计算将是这个样子
Double calculatedValue2 = output * (value of spinner2/1000);
//set the value to the textview, to display on screen.
resultM2.setText(calculatedValue2 + " M²");
我敢肯定双是不是要走的路，但想表现的东西在未来计算
简单地使用spinner.getSelectedItem（） – Pavya