English 中文(简体)
Android 动态无线电组
原标题:Android Dynamic RadioGroup

我想做一个均衡的无线电组。我想为预设添加动态的无线电按钮。

以下是我的版式 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>

这是爪哇代码:

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

}

When this activity opens nothing is displayed only blank layout screen. What am I missing?

谢谢 谢谢

问题回答

问题在于 rgEqualizer 实际上不是您布局中的 无线电组。 您可能的意思是 :

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

取代:

rgEqualizer = new RadioGroup(this);

所以,你的收音机按钮被加起来了,很好, 它们只是与你的布局无关。我感觉到你的痛苦。





相关问题
Android - ListView fling gesture triggers context menu

I m relatively new to Android development. I m developing an app with a ListView. I ve followed the info in #1338475 and have my app recognizing the fling gesture, but after the gesture is complete, ...

AsyncTask and error handling on Android

I m converting my code from using Handler to AsyncTask. The latter is great at what it does - asynchronous updates and handling of results in the main UI thread. What s unclear to me is how to handle ...

Android intent filter for a particular file extension?

I want to be able to download a file with a particular extension from the net, and have it passed to my application to deal with it, but I haven t been able to figure out the intent filter. The ...

Android & Web: What is the equivalent style for the web?

I am quite impressed by the workflow I follow when developing Android applications: Define a layout in an xml file and then write all the code in a code-behind style. Is there an equivalent style for ...

TiledLayer equivalent in Android [duplicate]

To draw landscapes, backgrounds with patterns etc, we used TiledLayer in J2ME. Is there an android counterpart for that. Does android provide an option to set such tiled patterns in the layout XML?

Using Repo with Msysgit

When following the Android Open Source Project instructions on installing repo for use with Git, after running the repo init command, I run into this error: /c/Users/Andrew Rabon/bin/repo: line ...

Android "single top" launch mode and onNewIntent method

I read in the Android documentation that by setting my Activity s launchMode property to singleTop OR by adding the FLAG_ACTIVITY_SINGLE_TOP flag to my Intent, that calling startActivity(intent) would ...

From Web Development to Android Development

I have pretty good skills in PHP , Mysql and Javascript for a junior developer. If I wanted to try my hand as Android Development do you think I might find it tough ? Also what new languages would I ...

热门标签