抱歉,如果这是一个非常菜鸟的问题,但是下面的代码没有给出输出,而且我的 logcat 视图不清楚,所以我无法判断运行模拟器时它走了多远。
我的单选按钮编码是否正确?变量语句的编码是否正确?你能看到任何其他错误吗?
布局xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_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"
tools:context=".MainActivity" >
<EditText
android:id="@+id/editText4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText3"
android:layout_below="@+id/editText3"
android:layout_marginTop="27dp"
android:ems="10" />
<EditText
android:id="@+id/editText3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText2"
android:layout_below="@+id/editText2"
android:layout_marginTop="19dp"
android:ems="10" />
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/editText1"
android:layout_marginTop="16dp"
android:ems="10" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="21dp"
android:ems="10" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/editText1"
android:layout_toRightOf="@+id/editText1"
android:text="@string/pressu"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/editText3"
android:layout_toRightOf="@+id/editText2"
android:text="@string/volu"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/editText3"
android:layout_alignLeft="@+id/textView2"
android:text="@string/molu"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/editText4"
android:layout_alignLeft="@+id/textView3"
android:text="@string/tempu"
android:textAppearance="?android:attr/textAppearanceSmall" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText4"
android:layout_below="@+id/editText4"
android:layout_marginTop="35dp"
android:text="@string/calc" />
<RadioGroup
android:id="@+id/radioGroup1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/button1"
android:layout_marginRight="33dp" >
<RadioButton
android:id="@+id/radio0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="@string/pressure" />
<RadioButton
android:id="@+id/radio1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/vol" />
<RadioButton
android:id="@+id/radio2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/mol" />
<RadioButton
android:id="@+id/radio3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/temp" />
</RadioGroup>
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="22dp"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
主要活动的 Java 在这里
package com.minichanic.idealgas;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText pressure;
private EditText volume;
private EditText moles;
private EditText temperature;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pressure = (EditText) findViewById(R.id.editText1);
volume = (EditText) findViewById(R.id.editText2);
moles = (EditText) findViewById(R.id.editText3);
temperature= (EditText) findViewById(R.id.editText4);
}
public void onClick(View view) {
//set values to the input
float pressuren = Float.parseFloat(pressure.getText().toString());
float volumen = Float.parseFloat(volume.getText().toString());
float molesn = Float.parseFloat(moles.getText().toString());
float temperaturen = Float.parseFloat(temperature.getText().toString());
//change values to standard conditions if blank
if (pressuren == 0) {pressuren = 100000;
}
if (volumen == 0) {volumen = (float)0.0247;
}
if (molesn == 0) {molesn= 1;
}
if (temperaturen == 0) {temperaturen = 298;
}
//set input values as answers for set text later
float pressans = (float) pressuren;
float volans = (float) volumen;
float moleans = (float) molesn;
float temperaturans = (float) temperaturen;
//set calculation depending on radio button
switch (view.getId()) {
case R.id.radio0:
pressans = (float) (molesn * 8.31 * temperaturen ) / volumen;
break;
case R.id.radio1:
volans = (float) (molesn * 8.31 * temperaturen ) / pressuren;
break;
case R.id.radio2:
moleans = (float) ((float) (pressuren * volumen)/(8.31 * temperaturen));
break;
case R.id.radio3:
temperaturans = (float) ((float) (pressuren * volumen)/(8.31 * molesn));
break;
}
//print values in the EditText fields
pressure.setText(""+pressans);
volume.setText(""+volans);
moles.setText(""+moleans);
temperature.setText(""+temperaturans);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
我为这个包得到的 logCat 是:
打开跟踪文件时出错:没有这样的文件或目录
任何想法将不胜感激。