Java Code Examples for android.widget.LinearLayout#getChildCount()

/**
 * Recycles items from specified layout.
 * There are saved only items not included to specified range.
 * All the cached items are removed from original layout.
 * 
 * @param layout the layout containing items to be cached
 * @param firstItem the number of first item in layout
 * @param range the range of current wheel items 
 * @return the new value of first item number
 */
public int recycleItems(LinearLayout layout, int firstItem, ItemsRange range) {
	int index = firstItem;
	for (int i = 0; i < layout.getChildCount();) {
		if (!range.contains(index)) {
			recycleView(layout.getChildAt(i), index);
			layout.removeViewAt(i);
			if (i == 0) { // first item
				firstItem++;
			}
		} else {
			i++; // go to next item
		}
		index++;
	}
	return firstItem;
}
 

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	/**
	 * 显示的设置一个宽度
	 */
	if (!once) {
		LinearLayout wrapper = (LinearLayout) getChildAt(0);
		mMenu = (ViewGroup) wrapper.getChildAt(0);

		mMenuWidth = mScreenWidth - mMenuRightPadding;
		mHalfMenuWidth = mMenuWidth / 2;
		mMenu.getLayoutParams().width = mMenuWidth;
		for (int i = 1; i < wrapper.getChildCount(); i++) {
			ViewGroup mContent = (ViewGroup) wrapper.getChildAt(i);
			mContent.getLayoutParams().width = mScreenWidth;
		}
	}
	updateState();
	super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}
 

/**
 * @param giftLayoutParent 存放礼物控件的父容器
 * @param giftLayoutNums   礼物控件的数量
 * @return
 */
public GiftControl setGiftLayout(LinearLayout giftLayoutParent, @NonNull int giftLayoutNums) {
    if (giftLayoutNums <= 0) {
        throw new IllegalArgumentException("GiftFrameLayout数量必须大于0");
    }
    if (giftLayoutParent.getChildCount() > 0) {//如果父容器没有子孩子，就进行添加
        return this;
    }
    mGiftLayoutParent = giftLayoutParent;
    mGiftLayoutMaxNums = giftLayoutNums;
    LayoutTransition transition = new LayoutTransition();
    transition.setAnimator(LayoutTransition.CHANGE_APPEARING,
            transition.getAnimator(LayoutTransition.CHANGE_APPEARING));
    transition.setAnimator(LayoutTransition.APPEARING,
            transition.getAnimator(LayoutTransition.APPEARING));
    transition.setAnimator(LayoutTransition.DISAPPEARING,
            transition.getAnimator(LayoutTransition.CHANGE_APPEARING));
    transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING,
            transition.getAnimator(LayoutTransition.DISAPPEARING));
    mGiftLayoutParent.setLayoutTransition(transition);

    return this;
}
 

/**
 * This procedure performs recursive initialization of elements from included layouts
 */
private void initializeLayout(LinearLayout l)
{
    for (int k = 0; k < l.getChildCount(); k++)
    {
        View v = l.getChildAt(k);
        if (v instanceof CustomTextView)
        {
            initializeSymbol((CustomTextView) v);
        }
        if (v instanceof CustomEditText)
        {
            initializeTerm((CustomEditText) v, l);
        }
        if (v instanceof LinearLayout)
        {
            initializeLayout((LinearLayout) v);
        }
    }
}
 

/**
 * view转bitmap
 */
private static Bitmap viewConversionBitmap(View v) {
    int w = v.getWidth();
    int h = 0;
    if (v instanceof LinearLayout){
        LinearLayout linearLayout = (LinearLayout) v;
        for (int i = 0; i < linearLayout.getChildCount(); i++) {
            h += linearLayout.getChildAt(i).getHeight();
        }
    } else if (v instanceof RelativeLayout){
        RelativeLayout relativeLayout = (RelativeLayout) v;
        for (int i = 0; i < relativeLayout.getChildCount(); i++) {
            h += relativeLayout.getChildAt(i).getHeight();
        }
    } else {
        h = v.getHeight();
    }
    Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bmp);
    //如果不设置canvas画布为白色，则生成透明
    c.drawColor(Color.WHITE);
    v.layout(0, 0, w, h);
    v.draw(c);
    return bmp;
}
 

public static void setFocusParms(LinearLayout currentRow, LinearLayout otherRow, boolean up) {

        for (int currentRowNdx = 0; currentRowNdx < currentRow.getChildCount(); currentRowNdx++) {
            ProgramGridCell cell = (ProgramGridCell) currentRow.getChildAt(currentRowNdx);
            ProgramGridCell otherCell = getOtherCell(otherRow, cell);
            if (otherCell != null) {
                if (up) {
                    cell.setNextFocusUpId(otherCell.getId());
                    //TvApp.getApplication().getLogger().Debug("Setting up focus for " + cell.getProgram().getName() + " to " + otherCell.getProgram().getName()+"("+otherCell.getId()+")");
                } else {
                    cell.setNextFocusDownId(otherCell.getId());
                    //TvApp.getApplication().getLogger().Debug("Setting down focus for " + cell.getProgram().getName() + " to " + otherCell.getProgram().getName());
                }
            }
        }
    }
 

/**
 * Recycles items from specified layout.
 * There are saved only items not included to specified range.
 * All the cached items are removed from original layout.
 * 
 * @param layout the layout containing items to be cached
 * @param firstItem the number of first item in layout
 * @param range the range of current wheel items 
 * @return the new value of first item number
 */
public int recycleItems(LinearLayout layout, int firstItem, ItemsRange range) {
	int index = firstItem;
	for (int i = 0; i < layout.getChildCount();) {
		if (!range.contains(index)) {
			recycleView(layout.getChildAt(i), index);
			layout.removeViewAt(i);
			if (i == 0) { // first item
				firstItem++;
			}
		} else {
			i++;
		}
		index++;
	}
	return firstItem;
}
 

public int getPositionInListX(int x,LinearLayout layout){
    for(int i = 0; i < layout.getChildCount();i++){
        int[] location = new int[2];
        View view = layout.getChildAt(i);
        int end = layout.getWidth();
        if(layout.getChildCount() > i+1){
            int[] end_location = new int[2];
            layout.getChildAt(i+1).getLocationOnScreen(end_location);
            end = end_location[0];
        }
        view.getLocationOnScreen(location);
        if(x >= location[0] && x <= end){
            return i;
        }
    }
    return 0;
}
 

public void setPopupItemsColor(int color, boolean icon) {
    if (popupLayout == null) {
        return;
    }
    final LinearLayout layout = popupLayout.linearLayout;
    for (int a = 0, count = layout.getChildCount(); a < count; a++) {
        final View child = layout.getChildAt(a);
        if (child instanceof TextView) {
            ((TextView) child).setTextColor(color);
        } else if (child instanceof ActionBarMenuSubItem) {
            if (icon) {
                ((ActionBarMenuSubItem) child).setIconColor(color);
            } else {
                ((ActionBarMenuSubItem) child).setTextColor(color);
            }
        }
    }
}
 

public KeyboardToolPop(Context context, OnClickListener onClickListener) {
    super(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

    @SuppressLint("InflateParams")
    View view = LayoutInflater.from(context).inflate(R.layout.pop_soft_keyboard_top_tool, null);
    this.setContentView(view);

    setTouchable(true);
    setOutsideTouchable(false);
    setFocusable(false);
    setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED); //解决遮盖输入法

    LinearLayout linearLayout = getContentView().findViewById(R.id.ll_content);

    for (int i = 0; i < linearLayout.getChildCount(); i++) {
        TextView tv = (TextView) linearLayout.getChildAt(i);
        tv.setOnClickListener(v -> {
            if (onClickListener != null) {
                onClickListener.click(((TextView) v).getText().toString());
            }
        });
    }
}
 

/**
 * Update a existing view with some column.
 *
 * @param position  Current position of the cell.
 * @param viewGroup Container of the cell.
 * @param layout    Layout saved of the cell.
 */
private void updateItemRow(int position, ViewGroup viewGroup, LinearLayout layout) {
    // we remove view that aren't needed for the row
    while(layout.getChildCount()>rows.get(position).size()){
        layout.removeViewAt(layout.getChildCount()-1);
    }

    for (int i = 0; i < rows.get(position).size(); i++) {
        int currentPos = rows.get(position).indexFirstItem + i;
        View insideView = layout.getChildAt(i);

        View theView = super.getView(currentPos, insideView, viewGroup);

        // Set the width of this column
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, ViewGroup.LayoutParams.WRAP_CONTENT);
        params.weight = rows.get(position).get(i).colSpan;
        if (i != mNumColumns - 1)// last col
            params.setMargins(0, 0, cellMargin, 0);
        theView.setLayoutParams(params);

        theView.setOnClickListener(new ListItemClickListener(currentPos));
        if (!theView.equals(insideView)) {
            if (layout.getChildCount() > i) {
                layout.removeViewAt(i);
            }
            layout.addView(theView, i);
        }
    }
}
 

public static Integer findItemIndex(ODrawerItem item, LinearLayout itemContainer) {
    for (int i = 0; i < itemContainer.getChildCount(); i++) {
        ODrawerItem dItem = (ODrawerItem) itemContainer.getChildAt(i).getTag();
        if (dItem != null && dItem.getKey().equals(item.getKey())) {
            return i;
        }
    }
    return -1;

}
 

public void setColorPreview(LinearLayout colorPreview, Integer selectedColor) {
    if (colorPreview == null)
        return;
    this.colorPreview = colorPreview;
    if (selectedColor == null)
        selectedColor = 0;
    int children = colorPreview.getChildCount();
    if (children == 0 || colorPreview.getVisibility() != View.VISIBLE)
        return;

    for (int i = 0; i < children; i++) {
        View childView = colorPreview.getChildAt(i);
        if (!(childView instanceof LinearLayout))
            continue;
        LinearLayout childLayout = (LinearLayout) childView;
        if (i == selectedColor) {
            childLayout.setBackgroundColor(Color.WHITE);
        }
        ImageView childImage = (ImageView) childLayout.findViewById(R.id.image_preview);
        childImage.setClickable(true);
        childImage.setTag(i);
        childImage.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (v == null)
                    return;
                Object tag = v.getTag();
                if (tag == null || !(tag instanceof Integer))
                    return;
                setSelectedColor((int) tag);
            }
        });
    }
}
 

private void init(){
    Context context=getContext();
    View view=View.inflate(context, R.layout.markdown_edittext,this);
    editText=(AppCompatEditText)view.findViewById(R.id.markdown_edit);
    LinearLayout linearLayout=(LinearLayout) view.findViewById(R.id.span_toolbar);
    for(int i=0;i<linearLayout.getChildCount();i++){
        linearLayout.getChildAt(i).setOnClickListener(this);
    }
    editText.setOnKeyListener(new OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            switch (keyCode) {
                case KeyEvent.KEYCODE_ENTER:
                    if (KeyEvent.ACTION_DOWN == event.getAction()) {
                        int index = getParagraphStart();
                        String text = editText.getText().toString().substring(index);
                        int index2 = text.indexOf("- ");
                        if (index2 >= 0 && text.substring(0, index2).trim().isEmpty()) {
                            if (editText.getSelectionStart() < editText.getSelectionEnd()) {
                                editText.getEditableText().replace(editText.getSelectionStart(), editText.getSelectionEnd(), "\n" + text.substring(0, index2) + "- ");
                            } else {
                                editText.getEditableText().insert(editText.getSelectionStart(), "\n" + text.substring(0, index2) + "- ");
                            }
                            return true;
                        }
                    }
                    break;
            }
            return false;
        }
    });
}
 

private void enableAllChildren(LinearLayout parent, boolean b) {

        try {
            for (int i = 0; i < parent.getChildCount(); i++) {
                View v = parent.getChildAt(i);
                v.setSelected(b);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
 

/**
 * 把系统自身请求失败时的网页隐藏
 */
protected void hideErrorPage() {
    LinearLayout webParentView = (LinearLayout) mWebView.getParent();
    mIsErrorPage = false;
    while (webParentView.getChildCount() > 1) {
        webParentView.removeViewAt(0);
    }
}
 

public void removeBarValues() {

		if (oldFrameLayout != null)
			removeClickedBar();

		final int barsCount = ((LinearLayout) this.getChildAt(0)).getChildCount();

		for (int i = 0; i < barsCount; i++) {

			FrameLayout rootFrame = (FrameLayout) ((LinearLayout) this.getChildAt(0)).getChildAt(i);
			int rootChildCount = rootFrame.getChildCount();

			for (int j = 0; j < rootChildCount; j++) {

				View childView = rootFrame.getChildAt(j);

				if (childView instanceof LinearLayout) {
					//bar
					LinearLayout barContainerLinear = ((LinearLayout) childView);
					int barContainerCount = barContainerLinear.getChildCount();

					for (int k = 0; k < barContainerCount; k++) {

						View view = barContainerLinear.getChildAt(k);

						if (view instanceof Bar) {
							BarAnimation anim = new BarAnimation(((Bar) view), (int) (mDataList.get(i).getBarValue() * 100), 0);
							anim.setDuration(250);
							((Bar) view).startAnimation(anim);
						}
					}
				}
			}


		}
		isBarsEmpty = true;
	}
 

public void setColorPreview(LinearLayout colorPreview, Integer selectedColor) {
	if (colorPreview == null)
		return;
	this.colorPreview = colorPreview;
	if (selectedColor == null)
		selectedColor = 0;
	int children = colorPreview.getChildCount();
	if (children == 0 || colorPreview.getVisibility() != View.VISIBLE)
		return;

	for (int i = 0; i < children; i++) {
		View childView = colorPreview.getChildAt(i);
		if (!(childView instanceof LinearLayout))
			continue;
		LinearLayout childLayout = (LinearLayout) childView;
		if (i == selectedColor) {
			childLayout.setBackgroundColor(Color.WHITE);
		}
		ImageView childImage = (ImageView) childLayout.findViewById(R.id.image_preview);
		childImage.setClickable(true);
		childImage.setTag(i);
		childImage.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (v == null)
					return;
				Object tag = v.getTag();
				if (tag == null || !(tag instanceof Integer))
					return;
				setSelectedColor((int) tag);
			}
		});
	}
}
 

private void performOK() {
    PreferencesFragment fragment = (PreferencesFragment) getTargetFragment();
    if (fragment == null) {
        return;
    }

    if (validate()) {
        Editable editable = mKey.getText();
        String key = "";
        if (editable != null) {
            key = editable.toString();
        }
        Object value = null;

        switch (mPreferenceType) {
            case BOOLEAN:
                value = ((CompoundButton) mValue).isChecked();
                break;
            case INT:
                value = Integer.valueOf(((EditText) mValue).getText().toString());
                break;
            case STRING:
                value = ((EditText) mValue).getText().toString();
                break;
            case FLOAT:
                value = Float.valueOf(((EditText) mValue).getText().toString());
                break;
            case LONG:
                value = Long.valueOf(((EditText) mValue).getText().toString());
                break;
            case STRINGSET:
                Set<String> set = new HashSet<String>();
                LinearLayout container = (LinearLayout) mValue;
                for (int i = 0; i < container.getChildCount(); i++) {
                    set.add(((EditText) ((ViewGroup) ((ViewGroup) container.getChildAt(i)).getChildAt(0)).getChildAt(1)).getText().toString());
                }
                value = set;
                break;
            case UNSUPPORTED:
                break;
        }
        fragment.addPrefKeyValue(mEditKey, key, value, mEditMode);
    }
}
 

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    ((FDroidApp) getApplication()).applyTheme(this);
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    adapter = new MainViewAdapter(this);

    pager = (RecyclerView) findViewById(R.id.main_view_pager);
    pager.setHasFixedSize(true);
    pager.setLayoutManager(new NonScrollingHorizontalLayoutManager(this));
    pager.setAdapter(adapter);

    // Without this, the focus is completely busted on pre 15 devices. Trying to use them
    // without this ends up with each child view showing for a fraction of a second, then
    // reverting back to the "Latest" screen again, in completely non-deterministic ways.
    if (Build.VERSION.SDK_INT <= 15) {
        pager.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
    }

    updatesBadge = new TextBadgeItem().hide(false);

    bottomNavigation = (BottomNavigationBar) findViewById(R.id.bottom_navigation);
    bottomNavigation
            .addItem(new BottomNavigationItem(R.drawable.ic_latest, R.string.main_menu__latest_apps));
    if (BuildConfig.FLAVOR.startsWith("full")) {
        bottomNavigation
                .addItem(new BottomNavigationItem(R.drawable.ic_categories, R.string.main_menu__categories))
                .addItem(new BottomNavigationItem(R.drawable.ic_nearby, R.string.main_menu__swap_nearby));

        bottomNavigation.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (bottomNavigation.getCurrentSelectedPosition() == 2) {
                    NearbyViewBinder.updateUsbOtg(MainActivity.this);
                }
            }
        });
    }
    bottomNavigation.setTabSelectedListener(this)
            .setBarBackgroundColor(getBottomNavigationBackgroundColorResId())
            .setInActiveColor(R.color.bottom_nav_items)
            .setActiveColor(android.R.color.white)
            .setMode(BottomNavigationBar.MODE_FIXED)
            .addItem(new BottomNavigationItem(R.drawable.ic_updates, R.string.main_menu__updates)
                    .setBadgeItem(updatesBadge))
            .addItem(new BottomNavigationItem(R.drawable.ic_settings, R.string.menu_settings))
            .setAnimationDuration(0)
            .initialise();

    // turn off animation, scaling, and truncate labels in the middle
    final LinearLayout linearLayout = bottomNavigation.findViewById(R.id.bottom_navigation_bar_item_container);
    final int childCount = linearLayout.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View fixedBottomNavigationTab = linearLayout.getChildAt(i);
        try {
            Field labelScale = fixedBottomNavigationTab.getClass().getDeclaredField("labelScale");
            labelScale.setAccessible(true);
            labelScale.set(fixedBottomNavigationTab, 1.0f);
        } catch (IllegalAccessException | NoSuchFieldException | IllegalArgumentException e) {
            e.printStackTrace();
        }

        final View container = fixedBottomNavigationTab.findViewById(R.id.fixed_bottom_navigation_container);
        container.setPadding(
                2,
                container.getPaddingTop(),
                2,
                container.getPaddingBottom()
        );

        final TextView title = fixedBottomNavigationTab.findViewById(R.id.fixed_bottom_navigation_title);
        title.setEllipsize(TextUtils.TruncateAt.MIDDLE);
        title.setTextSize(TypedValue.COMPLEX_UNIT_SP, 13);
    }

    IntentFilter updateableAppsFilter = new IntentFilter(AppUpdateStatusManager.BROADCAST_APPSTATUS_LIST_CHANGED);
    updateableAppsFilter.addAction(AppUpdateStatusManager.BROADCAST_APPSTATUS_CHANGED);
    updateableAppsFilter.addAction(AppUpdateStatusManager.BROADCAST_APPSTATUS_REMOVED);
    LocalBroadcastManager.getInstance(this).registerReceiver(onUpdateableAppsChanged, updateableAppsFilter);

    if (savedInstanceState != null) {
        selectedMenuId = savedInstanceState.getInt(STATE_SELECTED_MENU_ID, (int) adapter.getItemId(0));
    } else {
        selectedMenuId = (int) adapter.getItemId(0);
    }
    setSelectedMenuInNav();

    initialRepoUpdateIfRequired();

    Intent intent = getIntent();
    handleSearchOrAppViewIntent(intent);
}