android.view.View#getNextFocusRightId ( )源码实例Demo

/**
 * Focuses the next visible view specified in the <code>view</code>
 *
 * @param view The view to find the next focus for
 */
protected void focusNext(View view) {
    int nextId = view.getNextFocusRightId();
    if (nextId == NO_ID) {
        return;
    }

    View nextView = findViewById(nextId);
    if (nextView.getVisibility() != View.VISIBLE) {
        focusNext(nextView);
        return;
    }

    nextView.requestFocus();
    currentFocus = nextView;
    buttonFocusChangeListener.onFocusChange(nextView, true);
}
 

/**
 * 向右移动焦点时, 下一个获取焦点的 View id
 * @param view {@link View}
 * @return 向右移动焦点时, 下一个获取焦点的 View id
 */
public static int getNextFocusRightId(final View view) {
    if (view != null) {
        return view.getNextFocusRightId();
    }
    return 0;
}
 

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    //Filter for LG devices, see https://code.google.com/p/android/issues/detail?id=78154
    if ((keyCode == KeyEvent.KEYCODE_MENU) &&
            (Build.VERSION.SDK_INT <= 16) &&
            (Build.MANUFACTURER.compareTo("LGE") == 0)) {
        openOptionsMenu();
        return true;
    }
    View v = getCurrentFocus();
    if (v == null)
        return super.onKeyUp(keyCode, event);
    if ((mActionBarIconId == -1) &&
        (v.getId() == -1)  &&
        (v.getNextFocusDownId() == -1) &&
        (v.getNextFocusUpId() == -1) &&
        (v.getNextFocusLeftId() == -1) &&
        (v.getNextFocusRightId() == -1)) {
        mActionBarIconId = Util.generateViewId();
        v.setId(mActionBarIconId);
        v.setNextFocusUpId(mActionBarIconId);
        v.setNextFocusDownId(mActionBarIconId);
        v.setNextFocusLeftId(mActionBarIconId);
        v.setNextFocusRightId(R.id.ml_menu_search);
        if (AndroidUtil.isHoneycombOrLater())
            v.setNextFocusForwardId(mActionBarIconId);
        if (findViewById(R.id.ml_menu_search) != null)
            findViewById(R.id.ml_menu_search).setNextFocusLeftId(mActionBarIconId);
    }
    return super.onKeyUp(keyCode, event);
}