Question

我试过这段代码。当模拟器启动时，它会在一行中显示三个单选按钮。但我需要一个按钮事件。即;如果我点击按钮，它应该询问单选按钮的数量。那么如果我给出计数，它必须根据给定的计数显示单选按钮。例如，如果我将计数设为3，则必须在一行中显示三个单选按钮。非常感谢您的帮助。提前谢谢。

  public class MyActivity extends Activity {
    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        for(int row=0; row < 1; row++)
        {
            LinearLayout ll = new LinearLayout(this);
            ll.setOrientation(LinearLayout.HORIZONTAL);
            for(int i = 1; i < 4; i++) {
                RadioButton rdbtn = new RadioButton(this);
                rdbtn.setId((row * 2) + i);
                rdbtn.setText("Radio " + rdbtn.getId());
                ll.addView(rdbtn);
            }
            ((ViewGroup)findViewById(R.id.radiogroup)).addView(ll);
        }
    }
    }

这是xml

<?xml version="1.0" encoding="utf-8"?>
<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"
                tools:context=".MainActivity" >

    <RadioGroup
            android:id="@+id/radiogroup"
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"/>

    </RelativeLayout>

Answer 1

请在下面找到代码，我在xml布局中创建了一个'EditText'和一个'Button'。在'EditText'中输入一个数字，然后单击Button，同样的no。单选按钮将添加到布局中。

这是您的 ActivityMain

public class ActivityMain extends Activity {    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final EditText editText=(EditText)findViewById(R.id.et_no);

        findViewById(R.id.btn).setOnClickListener(new OnClickListener() {           
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                int number=Integer.parseInt(editText.getText().toString());
                addRadioButtons(number);
            }
        });         
    }

    public void addRadioButtons(int number) {
        for (int row = 0; row < 1; row++) {
            RadioGroup ll = new RadioGroup(this);
            ll.setOrientation(LinearLayout.HORIZONTAL);

            for (int i = 1; i <= number; i++) {
                RadioButton rdbtn = new RadioButton(this);
                rdbtn.setId(View.generateViewId());
                rdbtn.setText("Radio " + rdbtn.getId());
                ll.addView(rdbtn);
            }
            ((ViewGroup) findViewById(R.id.radiogroup)).addView(ll);
        }
    }
}

这是布局文件

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context=".MainActivity" >

    <RadioGroup
        android:id="@+id/radiogroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:orientation="vertical" />

    <LinearLayout
        android:layout_marginTop="20dp"
        android:layout_marginLeft="20dp"
        android:layout_height="wrap_content"
        android:layout_width="match_parent">

        <EditText android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:hint="Enter no."
            android:inputType="number"
            android:id="@+id/et_no"/>

        <Button
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:text="Add Radio btn"
            android:id="@+id/btn"/>

    </LinearLayout>

</RelativeLayout>

Answer 2

尝试以下内容：

RadioGroup rgp= (RadioGroup) findViewById(R.id.radiogroup);
RadioGroup.LayoutParams rprms;

for(int i=0;i<3;i++){
      RadioButton radioButton = new RadioButton(this);
      radioButton.setText("new"+i);
      radioButton.setId(View.generateViewId());
      rprms= new RadioGroup.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
      rgp.addView(radioButton, rprms);
}

Answer 3

这是这样做的方法：

    RadioGroup rgp = (RadioGroup) findViewById(R.id.radio_group);        
    int buttons = 5;
    for (int i = 1; i <= buttons ; i++) {
        RadioButton rbn = new RadioButton(this);
        rbn.setId(View.generateViewId());
        rbn.setText("RadioButton" + i);
        rgp.addView(rbn);
    }

但是，如果您需要水平执行此操作，只需使用setOrientation()方法添加方向（默认值为垂直）：

    RadioGroup rgp = (RadioGroup) findViewById(R.id.radio_group);
    rgp.setOrientation(LinearLayout.HORIZONTAL);
    int buttons = 5;
    for (int i = 1; i <= buttons; i++) {
        RadioButton rbn = new RadioButton(this);
        rbn.setId(View.generateViewId());
        rbn.setText("RadioButton" + i);
        rbn.setLayoutParams(params);
        rgp.addView(rbn);
    }

这是完整的代码：

首先在我们的布局中定义RadioGroup：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    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">

    <RadioGroup
        android:id="@+id/radio_group"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</RelativeLayout>

MainActivity中的代码：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Defining 5 buttons.
        int buttons = 5;
        AppCompatRadioButton[] rb = new AppCompatRadioButton[buttons];

        RadioGroup rgp = (RadioGroup) findViewById(R.id.radio_group);
        rgp.setOrientation(LinearLayout.HORIZONTAL);

        for (int i = 1; i <= buttons; i++) {
            RadioButton rbn = new RadioButton(this);
            rbn.setId(View.generateViewId());
            rbn.setText("RadioButton" + i);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, 1f);
            rbn.setLayoutParams(params);
            rgp.addView(rbn);
        }

    }
}

Answer 4

在xml中添加Button和EditText，并将editText中的输入转换为变量inputValue并尝试此操作，

public class MyActivity extends Activity {

    /**
     * Called when the activity is first created.
     */
    LinearLayout ll=null;
    ViewGroup   vwgroup;
    Button btnClick;    

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        vwgroup=((ViewGroup)findViewById(R.id.radiogroup)
        btnClick=(Button)findViewById(R.id.button1);


        btnClick.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                if(ll!=null)
                    viewgroup.removeView(ll);
                ll = new LinearLayout(this);
                for(int i = 1; i < inputValue; i++) {
                    RadioButton rdbtn = new RadioButton(this);
                    rdbtn.setId(View.generateViewId());
                    rdbtn.setText("Radio " + rdbtn.getId());
                    ll.addView(rdbtn);
                }
                vwgroup.addView(ll);

            }
        });
    }
}

如何根据给定的计数动态添加单选按钮？

4 个答案: