Android动态RadioGroup

Question

我正在尝试制作均衡器RadioGroup。我想为预设动态添加单选按钮。

这是我的布局XML：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <RadioGroup
        android:id="@+id/rgEqualizerPreset"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
    </RadioGroup>

</LinearLayout>

这是Java代码：

RadioGroup rgEqualizer;
List<RadioButton> radioButtonList;
MediaPlayer mPlayer;
Equalizer mEqualizer;
LinearLayout.LayoutParams layoutParams;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    setContentView(R.layout.equalizer);
    rgEqualizer = (RadioGroup) findViewById(R.id.rgEqualizerPreset);

    mPlayer = new MediaPlayer();
    mEqualizer = new Equalizer(0, mPlayer.getAudioSessionId());
    rgEqualizer = new RadioGroup(this);
    radioButtonList = new ArrayList<RadioButton>();

    fillRadioGroupWithRadioButtons();
    rgEqualizer.setOnCheckedChangeListener(this);
}

private void fillRadioGroupWithRadioButtons() {

    Short noPresets = mEqualizer.getNumberOfPresets();
    int i = 0;
    while (i < noPresets) {
        RadioButton rb = new RadioButton(this);
        rb.setText(mEqualizer.getPresetName((short) i));
        layoutParams = new RadioGroup.LayoutParams(
                RadioGroup.LayoutParams.FILL_PARENT,
                RadioGroup.LayoutParams.FILL_PARENT);
        rgEqualizer.addView(rb, layoutParams);
        i++;
    }
}

@Override
public void onCheckedChanged(RadioGroup arg0, int arg1) {
    // TODO Auto-generated method stub

}

当此活动打开时，不会显示任何空白布局屏幕。 我错过了什么？

由于

Answer 1

问题是rgEqualizer实际上不是布局中的RadioGroup。你可能意味着：

rgEqualizer = (RadioGroup) this.findViewById(R.id.rgEqualizerPreset);

取代：

rgEqualizer = new RadioGroup(this);

所以你的单选按钮添加得很好，它们与你的布局无关。我感觉到你的痛苦。