在创建和显示布局时如何设置视图的焦点？

Set focus: The framework will handled moving focus in response to user input. To force focus to a specific view, call requestFocus()

Try

comp.requestFocusInWindow();

Set

 android:focusable="true"

in your <EditText/>

The last suggestion is the correct solution. Just to repeat, first set android:focusable="true" in the layout xml file, then requestFocus() on the view in your code.

i think a text view is not focusable. Try to set the focus on a button for example, or to set the property focusable to true.

This works:

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

you can add an edit text of size "0 dip" as the first control in ur xml, so, that will get the focus on render.(make sure its focusable and all...)

You should add this:

android:focusableInTouchMode="true"

Set these lines to OnResume as well and make sure if focusableInTouch is set to true while you initialize your controls

<controlName>.requestFocus();


<controlName>.requestFocusFromTouch();

To set focus, delay the requestFocus() using a Handler.

private Handler mHandler= new Handler();


public class HelloAndroid extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


LinearLayout mainVw = (LinearLayout) findViewById(R.id.main_layout);


LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);


EditText edit = new EditText(this);
edit.setLayoutParams(params);
mainVw.addView(edit);


TextView titleTv = new TextView(this);
titleTv.setText("test");
titleTv.setLayoutParams(params);
mainVw.addView(titleTv);


mHandler.post(
new Runnable()
{
public void run()
{
titleTv.requestFocus();
}
}
);
}
}

You can try just hidding the keyboard. Something like this:

InputMethodManager inputManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);

None of the answers above works for me. The only (let's say) solution has been to change the first TextView in a disabled EditText that receives focus and then add

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

in the onCreate callback to prevent keyboard to be shown. Now my first EditText looks like a TextView but can get the initial focus, finally.

You can start by adding android:windowSoftInputMode to your activity in AndroidManifest.xml file.

<activity android:name="YourActivity"
android:windowSoftInputMode="stateHidden" />

This will make the keyboard to not show, but EditText is still got focus. To solve that, you can set android:focusableInTouchmode and android:focusable to true on your root view.

<LinearLayout android:orientation="vertical"
android:focusable="true"
android:focusableInTouchMode="true"
...
>
<EditText
...
/>
<TextView
...
/>
<Button
...
/>
</LinearLayout>

The code above will make sure that RelativeLayout is getting focus instead of EditText

Focus is for selecting UI components when you are using something besides touch (ie, a d-pad, a keyboard, etc.). Any view can receive focus, though some are not focusable by default. (You can make a view focusable with setFocusable(true) and force it to be focused with requestFocus().)

However, it is important to note that when you are in touch mode, focus is disabled. So if you are using your fingers, changing the focus programmatically doesn't do anything. The exception to this is for views that receive input from an input editor. An EditText is such an example. For this special situation setFocusableInTouchMode(true) is used to let the soft keyboard know where to send input. An EditText has this setting by default. The soft keyboard will automatically pop up.

If you don't want the soft keyboard popping up automatically then you can temporarily suppress it as @abeljus noted:

InputMethodManager inputManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);

When a user clicks on the EditText, it should still show the keyboard, though.

Further reading:

• Having Trouble Focusing? A Primer on Focus in Android
• Android Developers Blog: Touch Mode

to change the focus make the textView in xml focusable

<TextView
**android:focusable="true"**
android:id="@+id/tv_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

and in java in on create

textView.requestFocus();

or simply hide the keyboard

public void hideKeyBoard(Activity act) {
act.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
}

You can add

       android:importantForAccessibility="yes"
android:focusable="true"
android:focusableInTouchMode="true"

to your Layout to force Talkback/accessibility to go there first.

You really only need the first line, however, the others reinforce to the OS what you want focused.

You can use the following Kotlin extension

fun View.focusAndShowKeyboard() {
/**
* This is to be called when the window already has focus.
*/
fun View.showTheKeyboardNow() {
if (isFocused) {
post {
// We still post the call, just in case we are being notified of the windows focus
// but InputMethodManager didn't get properly setup yet.
val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
imm.showSoftInput(this, InputMethodManager.SHOW_IMPLICIT)
}
}
}


requestFocus()


if (hasWindowFocus()) {
// No need to wait for the window to get focus.
showTheKeyboardNow()
} else {
// We need to wait until the window gets focus.
viewTreeObserver.addOnWindowFocusChangeListener(
object : ViewTreeObserver.OnWindowFocusChangeListener {
override fun onWindowFocusChanged(hasFocus: Boolean) {
// This notification will arrive just before the InputMethodManager gets set up.
if (hasFocus) {
this@focusAndShowKeyboard.showTheKeyboardNow()
// It’s very important to remove this listener once we are done.
viewTreeObserver.removeOnWindowFocusChangeListener(this)
}
}
}
)
}
}

And just call your view.focusAndShowKeyboard() in override fun onViewCreated(..) or override fun OnCreate(..)

PS: For hiding Views use the following extension

fun View.hideKeyboard() {
val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
imm.hideSoftInputFromWindow(windowToken, 0)
}

Make sure the views are focusable before that using the following android XML attributes, u can also do it programmatically

android:focusableInTouchMode="true"
android:focusable="true"