修改状态栏为全透明 @param activity

把Assets目录下的音乐文件写入SD卡 @throws IOException

{@inheritDoc}

{@inheritDoc}

<p>Clears the selection. When the selection is cleared, no radio button in this group is selected and {@link #getCheckedRadioButtonId()} returns null.

clear the cookie in the SharedPreferences

根据手机的分辨率从 dp 的单位 转成为 px(像素) @param context @param dpValue @return

{@inheritDoc}

<p>Returns the identifier of the selected radio button in this group. Upon empty selection, the returned value is -1.</p> @return the unique id of th

get the cookie which store in the SharedPreferences @return default return ""

Retrieve a float value from the preferences. @param key @return default return 0

Retrieve a long value from the preferences. @param key @return default return 0