Android：在運行時使用Java代碼創建radioButtons

Question

我正在嘗試創建radioButtons。 關鍵是我要創建的radioButtons的數量是可變的。 結果，我應該在我的android項目的Java代碼中實現它們的創建（而不是在xml中）。 我的問題是我不確定如何將這些radioButton添加到UI中。

for(int i=0; i< quizQuestion.getAnswers().size(); i++){
        radioButtons[i]  = new RadioButton(this);
        rb[i].setText(quizQuestion.getAnswers().get(i));

        //How do I add this to the UI?
}

謝謝。

Answer 1

一個簡單的例子。 希望對您有所幫助。

MainActivity.java

public class MainActivity extends AppCompatActivity {

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

        ////

        LinearLayout radioPanel= (LinearLayout) findViewById(R.id.radioPanel);

        for (int i = 0; i < 3; i++) {
            RadioButton radioButton=new RadioButton(this);

            radioButton.setSelected(false);

            radioButton.setLeft(16);
            radioButton.setRight(16);

            radioButton.setText("RadioButton "+ i);

            //Here you add these radioButton to the UI
            radioPanel.addView(radioButton);
        }


        ////

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:id="@+id/contentPanel"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">







<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Button"
    android:id="@+id/button"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />



<!--For RadioButton Content Area. (LinearLayout)-->

<!--You can use other layouts. This is just one example.-->

<LinearLayout
    android:id="@+id/radioPanel"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="200dp"
    android:layout_below="@+id/button"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true">

</LinearLayout>




<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/radioPanel"
    android:text="New Button 2"

    />