android - Intercept back button from soft keyboard

Question

I have the activity with several input fields. When activity started soft keyboard is shown. When back button pressed soft keyboard closes and to close activity I need to press back button one more time.

So the question: is it possible to intercept back button to close soft keyboard and finish activity in one press of back button without creating custom InputMethodService?

P.S. I know how to intercept back button in other cases: onKeyDown() or onBackPressed() but it doesn't work in this case: only second press of back button is intercepted.

Answer 1

onKeyDown() and onBackPressed() doesn't work for this case. You have to use onKeyPreIme.

Initially, you have to create custom edit text that extends EditText. And then you have to implement onKeyPreIme method which controls KeyEvent.KEYCODE_BACK. After this, one back press enough for solve your problem. This solution works for me perfectly.

CustomEditText.java

public class CustomEditText extends EditText {

    public CustomEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onKeyPreIme(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            // User has pressed Back key. So hide the keyboard
            InputMethodManager mgr = (InputMethodManager)         

           getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            mgr.hideSoftInputFromWindow(this.getWindowToken(), 0);
            // TODO: Hide your view as you do it in your activity
        }
        return false;
}

In your XML

<com.YOURAPP.CustomEditText
     android:id="@+id/CEditText"
     android:layout_height="wrap_content"
     android:layout_width="match_parent"/> 

In your Activity

public class MainActivity extends Activity {
   private CustomEditText editText;

   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      editText = (CustomEditText) findViewById(R.id.CEditText);
   }
}