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I apologise if an answer to this has already been posted, but I have looked for ages and can't find anything suitable.

I have four radio buttons and want to process a different calculation depending on which one has been selected from input data (from edit text). I also have a button to press to start the calculation.

The whole process works apart from the radio buttons. I know I need to use a switch/case command, but i am not sure ow to set it up.

I have tried the following in the main activity java class:

package com.minichanic.idealgas;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.RadioButton;
import android.widget.RadioGroup;


public class MainActivity extends Activity implements android.view.View.OnClickListener{
    Button add, subtract, multiply, divide, mod;
    EditText pressin, volin, molin, tempin;
    RadioButton radio0, radio1, radio2, radio3;
    RadioGroup RadioGroup1;
    private int variable;

    /** Called when the activity is first created  */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RadioGroup1 = (RadioGroup) findViewById(R.id.radioGroup1);

        // Reference TextViews and Buttons 

        pressin = (EditText) findViewById(R.id.editText1);
        volin = (EditText) findViewById(R.id.editText2);
        molin = (EditText) findViewById(R.id.editText3);
        tempin = (EditText) findViewById(R.id.editText4);
        add = (Button) findViewById(R.id.button1);


        // Set listeners for when buttons are pressed 
        add.setOnClickListener(this);


    }

    /**
     * Switch statement to decide which button was pressed droidacid.com
     */
    public void onClick(View arg0) {
        // Get values from EditTexts
        double pressure = Double.parseDouble(pressin.getText().toString());
        double volume = Double.parseDouble(volin.getText().toString());
        double moles = Double.parseDouble(molin.getText().toString());
        double temperature = Double.parseDouble(tempin.getText().toString());


          // Perform relevant operations depending on radio button
          // Check which radio button was clicked


        switch(variable){
                 case R.id.radio0:
                pressure = ((moles * 8.31* temperature)/volume);
                break;
                 case R.id.radio1:
                        volume = ((moles * 8.31* temperature)/pressure);
                        break;
                 case R.id.radio2:
                    moles = ((pressure * volume) /  (temperature * 8.31));
                        break;
                 case R.id.radio3:
                    temperature = ((pressure * volume) /  (moles * 8.31));
                        break;



            }

        // Add result to Running total stored in output TextView 
        String tempresult = ""+temperature;
        TextView tresult = (EditText) findViewById(R.id.editText4);
        tresult.setText(tempresult);
        String pressresult = ""+pressure;
        TextView presult = (EditText) findViewById(R.id.editText1);
        presult.setText(pressresult);
        String molresult = ""+moles;
        TextView mresult = (EditText) findViewById(R.id.editText3);
        mresult.setText(molresult);
        String volresult = ""+volume;
        TextView vresult = (EditText) findViewById(R.id.editText2);
        vresult.setText(volresult);


    }

}

The xml layout contains: 

    <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>

It was working fine, until I started introduced the radio buttons and now it crashes. Many thanks for any ideas.

4

2 回答 2

3

我将其发布为另一个答案，因为评论太长了。

设置android:onClick="onRadioButtonClicked"为每个单选按钮

<RadioButton
        android:id="@+id/radio0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="@string/pressure"

        android:onClick="onRadioButtonClicked"

 />
...

在存储当前选定单选按钮的位置创建局部变量并将其设置为默认单选按钮

...
View selectedRadio;
...
public void onCreate(Bundle savedInstanceState) {
    ...
    selectedRadio = findViewById(R.id.radio0);
    ...
}
...

创建方法onRadioButtonClicked将在单击指定的单选按钮并将我们的变量 selectedRadio 设置为当前选择的单选按钮后调用

public void onRadioButtonClicked(View view) {
    selectedRadio = view;
}

然后调整你的onClick方法来执行计算

public void onClick(View arg0) {
    ...
    switch(selectedRadio.getId()) {
        case R.id.radio0:
            // your code
            break;
        case R.id.radio1:
            // another code
            break;
        ...
    }
    ...
}

希望这对您有所帮助。没有测试此代码，但应该可以工作。

于 2013-06-26T11:47:21.090 回答
0

所有单选按钮都应在 radiogroup 内。请看这个例子。

http://www.mkyong.com/android/android-radio-buttons-example/

开关的使用很好。

于 2013-06-26T09:43:24.700 回答