我想创建一个声音首选项,其功能类似于闹钟和计时器应用程序中的声音选择。简而言之,首选项以标准列表首选项开始,但是一旦选择了音乐或铃声,就会显示另一个对话框,允许选择音频。
我是创建自定义偏好处理程序的唯一选择吗?我可以捕获初始列表首选项更改,然后显示音频处理程序吗?
答案 0 :(得分:0)
这是我的解决方案。我用自己的类扩展了ListPreference。关闭对话框后,我会调用音频列表的选择器。选择完成后,将调用自定义父PreferenceActivity。
相关代码位:
public class AlertBehaviorPreference extends ListPreference {
...
public void onDialogClosed(boolean positiveResult)
{
super.onDialogClosed(positiveResult);
if(positiveResult)
{
String s = this.getValue();
if(s != null && s.equals(SONG_ALARM_ACTION)) // play song
{
// Get the parent activity.
// This activity will be notified when the audio has been selected
PreferenceActivity pActivity = (PreferenceActivity)this.getContext();
// Select a recording
Intent i = new Intent(pActivity, pActivity.getClass());
i.setAction(Intent.ACTION_GET_CONTENT);
i.setType("audio/*");
pActivity.startActivityForResult(Intent.createChooser(i, "Select song"), 1);
Log.d(TAG, "Started audio activity chooser");
}
public class MyPreferenceActivity extends PreferenceActivity {
...
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Call back into the preference to save data
// Where the result can be validated and settings can be
// be reset if the user cancelled the request.
((AlertBehaviorPreference)(findPreference("alertBehaviorPreference"))).onSongActivitySelectionComplete(data);
}