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我开发了一个简单的单位换算器,并且我被困在2个问题上。 第一个是我编译和运行APK后,应用程序崩溃点击转换按钮。 第二个是我不知道如何连接forResult(计算后的答案变量)到Text“After”旁边的框中。 我真的乞求你的帮助....谢谢.... ^^单位换算的问题
Main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="left|right"
android:orientation="vertical"
android:background="#66FFFF" >
<FrameLayout
android:id="@+id/frameLayout2"
android:layout_width="match_parent"
android:layout_height="20dp" >
</FrameLayout>
<TextView
android:id="@+id/UnitText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/UnitText"
android:textColor="@android:color/black"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Spinner
android:id="@+id/Spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:prompt="@string/UnitPrompt"/>
<FrameLayout
android:id="@+id/frameLayout3"
android:layout_width="match_parent"
android:layout_height="20dp" >
</FrameLayout>
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right"
android:orientation="vertical" >
<Button
android:onClick="converter"
android:id="@+id/ConvertButton"
android:layout_width="131dp"
android:layout_height="wrap_content"
android:text="@string/ConvertText" />
</LinearLayout>
<FrameLayout
android:id="@+id/frameLayout1"
android:layout_width="match_parent"
android:layout_height="30dip" >
</FrameLayout>
<TableLayout
android:id="@+id/tableLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<EditText
android:id="@+id/BeforeBox"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:inputType="numberDecimal" />
<TextView
android:id="@+id/BeforeText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/BeforeText"
android:textColor="@android:color/black"
android:textAppearance="?android:attr/textAppearanceLarge" />
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<EditText
android:id="@+id/AfterBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal" />
<TextView
android:id="@+id/AfterText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/AfterText"
android:textColor="@android:color/black"
android:textAppearance="?android:attr/textAppearanceLarge" />
</TableRow>
</TableLayout>
BasicUnitconverterActivity.Java
package arirang.unit.converter;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Button;
import android.widget.TextView;
public class BasicUnitConverterActivity extends Activity {
private double val1;
Spinner Type;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner1 = (Spinner) findViewById(R.id.Spinner1);
ArrayAdapter adapter1 = ArrayAdapter.createFromResource(
this, R.array.UnitList, android.R.layout.simple_spinner_item);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter1);
}
public void converter() {
Type = (Spinner)findViewById(R.id.Spinner1);
val1 = (R.id.BeforeBox);
double dbResult = 0;
if(Type.getSelectedItem().toString().equals("meter to inch"))
{
dbResult = val1 * 39.3700787 ;
}
else if(Type.getSelectedItem().toString().equals("meter to feet"))
{
dbResult = val1 * 3.2808399;
}
else if(Type.getSelectedItem().toString().equals("feet to inch"))
{
dbResult = val1 * 12;
}
else if(Type.getSelectedItem().toString().equals("feet to meter"))
{
dbResult = val1/3.2808399;
}
else if(Type.getSelectedItem().toString().equals("inch to meter"))
{
dbResult = val1/39.3700787 ;
}
else if(Type.getSelectedItem().toString().equals("inch to feet"))
{
dbResult = val1/12;
}
else if(Type.getSelectedItem().toString().equals("kilogram to pound"))
{
dbResult = val1 * 2.20462262;
}
else if(Type.getSelectedItem().toString().equals("pound to kilogram"))
{
dbResult = val1/2.20462262;
}
else if(Type.getSelectedItem().toString().equals("Fahernheit to Celsius"))
{
dbResult=(val1 - 32)/(5/9);
}
else if(Type.getSelectedItem().toString().equals("Celsius to Fahernheit"))
{
dbResult = (9/5) * val1 + 32;
}
TextView ShowBox = (TextView)findViewById(R.id.AfterBox);
ShowBox.setText("forResult");
}
}
我用android:onClick =“转换器”...但是我需要用什么命令或代码从BeforeBox中获取数字到val1? – user1193653 2012-02-08 00:02:00
BeforeBox是一个EditText,所以你从EditText开始。t =(EditText)findViewById(R.id.BeforeBox);然后,您可以使用String s = t.getText()。toString();来检索文本。然后你可以做Double d(s)这样的事情;最后val1 = s.doubleValue(); - 抱歉格式在这里,但我不能在此评论框中插入换行符。 – 2012-02-08 03:05:59