嗨，我只想在单击转换按钮后才在edittext 2中显示结果，还有第二个按钮（清除）在我运行程序时未显示如何显示它，因为屏幕尺寸很小这里是代码
package converter.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class now extends Activity {
/** defining variables */
String[] currencys1,currencys2;
String e,l,f,u,d;
double EURO=5,dollar=6,franc=7,LE=1,UAE=8,txtvalue;
EditText txt1,txt2;
Button convert,clear;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txt1 =(EditText)findViewById(R.id.txt1);
txt2 =(EditText)findViewById(R.id.txt2);
convert=(Button)findViewById(R.id.btn1);
clear=(Button)findViewById(R.id.clear_btn);
currencys1=getResources().getStringArray(R.array.currency);
final Spinner s1=(Spinner)findViewById(R.id.sp1);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_dropdown_item, currencys1);
s1.setAdapter(adapter);
s1.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3)
{
switch(arg2)
{
case 0:
break;
case 1:
break;
case 2:
break;
case 3:
break;
case 4:
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
currencys2=getResources().getStringArray(R.array.currency1);
final Spinner s2=(Spinner)findViewById(R.id.sp2);
ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_dropdown_item, currencys2);
s2.setAdapter(adapter1);
s2.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3)
{
txtvalue = Double.parseDouble(txt1.getText().toString());
switch(arg2)
{
case 0:
final String fromCurrencyCode = s1.getSelectedItem().toString();
final String toCurrencyCode = s2.getSelectedItem().toString();
if (fromCurrencyCode.equals(toCurrencyCode)) {
txt2.setText(txt1.getText());
}
else
{
double EURO1=txtvalue*EURO;
txt2.setText(String.valueOf(EURO1));
}
break;
case 1:
final String fromCurrencyCode1 = s1.getSelectedItem().toString();
final String toCurrencyCode1 = s2.getSelectedItem().toString();
if (fromCurrencyCode1.equals(toCurrencyCode1)) {
txt2.setText(txt1.getText());
}
else
{
double LE1=txtvalue*LE;
txt2.setText(String.valueOf(LE1));
}
break;
case 2:
final String fromCurrencyCode2 = s1.getSelectedItem().toString();
final String toCurrencyCode2 = s2.getSelectedItem().toString();
if (fromCurrencyCode2.equals(toCurrencyCode2)) {
txt2.setText(txt1.getText());
}
else
{
double franc1=txtvalue*franc;
txt2.setText(String.valueOf(franc1));
}
break;
case 3:
final String fromCurrencyCode3 = s1.getSelectedItem().toString();
final String toCurrencyCode3 = s2.getSelectedItem().toString();
if (fromCurrencyCode3.equals(toCurrencyCode3)) {
txt2.setText(txt1.getText());
}
else
{
double UAE1=txtvalue*UAE;
txt2.setText(String.valueOf(UAE1));
}
break;
case 4:
final String fromCurrencyCode4 = s1.getSelectedItem().toString();
final String toCurrencyCode4 = s2.getSelectedItem().toString();
if (fromCurrencyCode4.equals(toCurrencyCode4)) {
txt2.setText(txt1.getText());
}
else
{
double dollar1=txtvalue*dollar;
txt2.setText(String.valueOf(dollar1));
}
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
convert.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
//i want to put the code here which show result only after click that button
}
});
clear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
txt2.setText(" ");
}
});
}
}
这是xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#cad1d9"
>
<TableLayout android:layout_width="match_parent" android:id="@+id/tableLayout1" android:layout_height="wrap_content">
<TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="from" android:textColor="#5c6471"></TextView>
</TableLayout>
<Spinner android:id="@+id/sp1" android:layout_height="50dip" android:layout_width="match_parent"></Spinner>
<TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Amount" android:textColor="#5c6471"></TextView>
<EditText android:text="1" android:id="@+id/txt1" android:layout_width="match_parent" android:layout_height="wrap_content" android:numeric="decimal"></EditText>
<TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="To" android:textColor="#5c6471"></TextView>
<Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/sp2"></Spinner>
<TextView android:id="@+id/textView4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="value" android:textColor="#5c6471"></TextView>
<EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/txt2" android:text="1" android:editable="false"></EditText>
<Button android:editable="false" android:width="100px" android:gravity="center" android:id="@+id/btn1" android:text="Convert" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<Button android:text="@string/clear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:minWidth="400px" android:id="@+id/clear_btn"></Button>
</LinearLayout>