My Android advanced tour ------ & gt; Android & lt; requestFocus/& gt; tag usage, androidrequestfocus

My Android advanced tour ------> Android <requestFocus/> label usage, androidrequestfocus

You can use container controls (such as LinearLayout and FrameLayout) or non-container controls (such as EditText and TextView) to layout the root node of the resource file ). For non-container controls, the <requestFocus/> label can only be placed in the non-container control label, indicating that the current control is set to focus. The following code:

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "match_parent" android: layout_height = "match_parent" android: orientation = "vertical"> <Button android: id = "@ + id/buttonRingtone" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: text = "set ringtone"/> <Button android: id = "@ + id/buttonAlarm" android: layout_width = "wrap_content" android: l Ayout_height = "wrap_content" android: text = "Set alert tone"/> <Button android: id = "@ + id/buttonNotification" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: text = "set notification ringtones"/> <EditText android: id = "@ + id/text" android: layout_width = "match_parent" android: layout_height = "wrap_content"> <! -- The current control is in focus state --> <requestFocus/> </EditText> </LinearLayout>

After running, the EditText control is in the focus state, and the cursor keeps moving and cannot be captured. As shown in:

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