[android] Soft keyboard open and close listener in an activity in Android

This only works when android:windowSoftInputMode of your activity is set to adjustResize in the manifest. You can use a layout listener to see if the root layout of your activity is resized by the keyboard.

I use something like the following base class for my activities:

public class BaseActivity extends Activity {
    private ViewTreeObserver.OnGlobalLayoutListener keyboardLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            int heightDiff = rootLayout.getRootView().getHeight() - rootLayout.getHeight();
            int contentViewTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();

            LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(BaseActivity.this);

            if(heightDiff <= contentViewTop){
                onHideKeyboard();

                Intent intent = new Intent("KeyboardWillHide");
                broadcastManager.sendBroadcast(intent);
            } else {
                int keyboardHeight = heightDiff - contentViewTop;
                onShowKeyboard(keyboardHeight);

                Intent intent = new Intent("KeyboardWillShow");
                intent.putExtra("KeyboardHeight", keyboardHeight);
                broadcastManager.sendBroadcast(intent);
            }
        }
    };

    private boolean keyboardListenersAttached = false;
    private ViewGroup rootLayout;

    protected void onShowKeyboard(int keyboardHeight) {}
    protected void onHideKeyboard() {}

    protected void attachKeyboardListeners() {
        if (keyboardListenersAttached) {
            return;
        }

        rootLayout = (ViewGroup) findViewById(R.id.rootLayout);
        rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(keyboardLayoutListener);

        keyboardListenersAttached = true;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (keyboardListenersAttached) {
            rootLayout.getViewTreeObserver().removeGlobalOnLayoutListener(keyboardLayoutListener);
        }
    }
}

The following example activity uses this to hide a view when the keyboard is shown and show it again when the keyboard is hidden.

The xml layout:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/rootLayout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">              

    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        >

        <!-- omitted for brevity -->

    </ScrollView>

    <LinearLayout android:id="@+id/bottomContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

        <!-- omitted for brevity -->

    </LinearLayout>

</LinearLayout>

And the activity:

public class TestActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test_activity);

        attachKeyboardListeners();
    }

    @Override
    protected void onShowKeyboard(int keyboardHeight) {
        // do things when keyboard is shown
        bottomContainer.setVisibility(View.GONE);
    }

    @Override
    protected void onHideKeyboard() {
        // do things when keyboard is hidden
        bottomContainer.setVisibility(View.VISIBLE);
    }        
}