Android requestFocus detailed explanation and example

Android requestFocus detailed explanation and example

Use of requestFocus

In summary in one sentence:

<requestFocus />: The tag is used to specify the focus view within the screen.

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

&lt;LinearLayout xmlns:andro 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:orientation="vertical" &gt; 
 
  &lt;Button 
    android: 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Set incoming ringtone" /&gt; 
 
  &lt;Button 
    android: 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Set alarm ringtone" /&gt; 
 
  &lt;Button 
    android: 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Set notification ringtone" /&gt; 
 
  &lt;EditText 
    android: 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" &gt; 
    &lt;!-- The current control is in focus --&gt; 
    &lt;requestFocus /&gt; 
  &lt;/EditText&gt; 
&lt;/LinearLayout&gt;

In this way, edittext gets focus when entering.

The use of Android requestFocus is finished.

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