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Øredev 2017: Cool ConstraintLayout

Øredev 2017: Cool ConstraintLayout

Huyen's presentation at Øredev 2017 on cool things about and cool things to do with ConstraintLayout on Android.

Huyen Tue Dao

November 10, 2017
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  1. HOW DOES IT WORK? CONSTRAINTS EQUATIONS SOLVER POSITION FIXED WRAP

    CONTENT MATCH CONSTRAINT RATIO PERCENT EDGE CENTER BASELINE CIRCULAR (1.1) DIMENSION OTHER 8 CHAINS CONSTRAINT SET PLACEHOLDERS GUIDELINES GROUPS BARRIERS
  2. CONSTRAINTS EQUATIONS SOLVER LINEAR SYSTEM OF EQUATIONS/INEQUALITIES 9 HOW DOES

    IT WORK? 11 + … + 1n = 11 + … + 1n ≤ 11 + … + 1n ≥
  3. !!!<!-- Match Constraint Modifiers —> !!!<!-- Min/Max —> app:layout_constraintWidth_max="200dp" app:layout_constraintHeight_min="wrap"

    !!!<!-- Percent !!--> app:layout_constraintWidth_percent=".75" app:layout_constraintHeight_percent=".5" !!!<!-- Ratio !!--> app:layout_constraintDimensionRatio="1:1"
  4. <android.support.constraint.Guideline
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/guideline_start"
 android:orientation="vertical"
 app:layout_constraintGuide_begin="16dp" />
 
 
 <android.support.constraint.Guideline


    android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/horizontal"
 android:orientation="horizontal"
 app:layout_constraintGuide_percent="0.37" />
  5. public class SquareImageView extends ImageView { @Override
 protected void onMeasure(int

    widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 
 final int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
 setMeasuredDimension(size, size);
 }
  6. private fun updateManualAnchors() {
 val size = anchorMinSize + seekBar.progress


    val halfSize = Math.round(size * 0.5f)
 val horizontalMargin = resources.getDimensionPixelSize(R.dimen.content_margin_horizontal) - halfSize
 val verticalMargin = resources.getDimensionPixelSize(R.dimen.alignment_rectangle_margin_vertical) - halfSize
 updateManualAnchor(frameAnchorTop, size, verticalMargin, 0, 0, 0)
 updateManualAnchor(frameAnchorStart, size, 0, horizontalMargin, 0, 0)
 updateManualAnchor(frameAnchorBottom, size, 0, 0, verticalMargin, 0)
 updateManualAnchor(frameAnchorEnd, size, 0, 0, 0, horizontalMargin)
 }
 
 private fun updateManualAnchor(anchor: View, size: Int,
 marginTop: Int, marginStart: Int,
 marginBottom: Int, marginEnd: Int) {
 val layoutParams = anchor.layoutParams as FrameLayout.LayoutParams layoutParams.width = size
 layoutParams.height = size
 layoutParams.topMargin = marginTop
 layoutParams.bottomMargin = marginBottom
 layoutParams.marginStart = marginStart
 layoutParams.marginEnd = marginEnd anchor.layoutParams = layoutParams
 } WITH CONSTRAINTLAYOUT JUST CHANGE THE SIZE…
  7. <TextView
 android:id=“@+id/weighted_chain_head
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 app:layout_constraintHorizontal_chainStyle="spread"
 app:layout_constraintHorizontal_weight=“1" /> <TextView
 android:id=“@+id/next android:layout_width="0dp"


    android:layout_height="wrap_content"
 app:layout_constraintHorizontal_weight="2" /> <TextView
 android:id=“@+id/last
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 app:layout_constraintHorizontal_weight="1" /> 38 WEIGHTED CHAIN
  8. CONSTRAINT SET CREATE/SAVE/APPLY CREATE MANUALLY CLONE A LAYOUT FILE CLONE

    A CONSTRAINT LAYOUT AWESOME WITH TRANSITIONS DEFINE SET OF CONSTRAINTS PROGRAMMATICALLY
  9. // Inflate initial layout as usual. setContentView(R.layout.activity_constraintset_01) // Get references

    to controls
 constraintLayout = findViewById(R.id.constraint_layout) as ConstraintLayout
 
 // Load ConstraintSets.
 constraintSet01.clone(constraintLayout)
 constraintSet02.clone(this, R.layout.activity_constraintset_02) …some time later… // Toggle ConstraintSets. TransitionManager.beginDelayedTransition(constraintLayout)
 if (original) constraintSet02.applyTo(constraintLayout)
 else constraintSet01.applyTo(constraintLayout)
 original = !original 44
  10. CUSTOM VIEW GROUPS GENERALIZED, REUSABLE LAYOUTS PERFORMANT COMPOSITE LAYOUTS LAYOUT

    IS LOW-LEVEL (X, Y) EVEN SIMPLE ONES = MUCH CODE ADVANCED LAYOUTS… WOAH
  11. @Override
 protected void onLayout(boolean changed, int left, int top, int

    right, int bottom) {
 MarginLayoutParams layoutParams = (MarginLayoutParams) icon.getLayoutParams();
 
 // Figure out the x-coordinate and y-coordinate of the icon.
 int x = getPaddingLeft() + layoutParams.leftMargin;
 int y = getPaddingTop() + layoutParams.topMargin;
 
 // Layout the icon.
 icon.layout(x, y, x + icon.getMeasuredWidth(), y + icon.getMeasuredHeight());
 
 // Calculate the x-coordinate of the title: icon's right coordinate +
 // the icon's right margin.
 x += icon.getMeasuredWidth() + layoutParams.rightMargin;
 
 // Add in the title's left margin.
 layoutParams = (MarginLayoutParams) titleView.getLayoutParams();
 x += layoutParams.leftMargin;
 
 // Calculate the y-coordinate of the title: this ViewGroup's top padding +
 // the title's top margin
 y = getPaddingTop() + layoutParams.topMargin;
 
 // Layout the title.
 titleView.layout(x, y, x + titleView.getMeasuredWidth(), y + titleView.getMeasuredHeight());
 
 // The subtitle has the same x-coordinate as the title. So no more calculating there.
 
 // Calculate the y-coordinate of the subtitle: the title's bottom coordinate +
 // the title's bottom margin.
 y += titleView.getMeasuredHeight() + layoutParams.bottomMargin;
 layoutParams = (MarginLayoutParams) subtitleView.getLayoutParams();
 
 // Add in the subtitle's top margin.
 y += layoutParams.topMargin;
 
 // Layout the subtitle.
 subtitleView.layout(x, y,
 x + subtitleView.getMeasuredWidth(), y + subtitleView.getMeasuredHeight());
 } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // Measure icon. measureChildWithMargins(icon, widthMeasureSpec, 0, heightMeasureSpec, 0); // Figure out how much width the icon used. MarginLayoutParams lp = (MarginLayoutParams) icon.getLayoutParams(); int widthUsed = icon.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; int heightUsed = 0; // Measure title measureChildWithMargins( titleView, // Pass width constraints and width already used. widthMeasureSpec, widthUsed, // Pass height constraints and height already used. heightMeasureSpec, heightUsed ); // Measure the Subtitle. measureChildWithMargins( subtitleView, // Pass width constraints and width already used. widthMeasureSpec, widthUsed, // Pass height constraints and height already used. heightMeasureSpec, titleView.getMeasuredHeight()); // Calculate this view's measured width and height. // Figure out how much total space the icon used. int iconWidth = icon.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; int iconHeight = icon.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; lp = (MarginLayoutParams) titleView.getLayoutParams(); // Figure out how much total space the title used. int titleWidth = titleView.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; int titleHeight = titleView.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; lp = (MarginLayoutParams) subtitleView.getLayoutParams(); // Figure out how much total space the subtitle used. int subtitleWidth = subtitleView.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; int subtitleHeight = subtitleView.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; // The width taken by the children + padding. int width = getPaddingTop() + getPaddingBottom() + iconWidth + Math.max(titleWidth, subtitleWidth); // The height taken by the children + padding. int height = getPaddingTop() + getPaddingBottom() + Math.max(iconHeight, titleHeight + subtitleHeight); // Reconcile the measured dimensions with the this view's constraints and // set the final measured width and height. setMeasuredDimension( resolveSize(width, widthMeasureSpec), resolveSize(height, heightMeasureSpec) ); }
  12. private fun addRow(view: View) {
 constraintLayout.addView(view)
 
 val id =

    view.id
 constraintSet.constrainWidth(id, MATCH_CONSTRAINT)
 constraintSet.constrainHeight(id, rowHeight)
 
 // Constrain new view vertically.
 val target = if (lastRowId  PARENT_ID) TOP else BOTTOM
 constraintSet.connect(id, TOP, lastRowId, target) // Constrain new view horizontally.
 constraintSet.connect(id, START, PARENT_ID, START)
 constraintSet.connect(id, END, PARENT_ID, END)
 
 // Toggle elevation to elevate last added view.
 constraintSet.setElevation(id, resources.getDimension(R.dimen.elevation))
 constraintSet.setElevation(lastViewId, 0f)
 
 // Apply constraints.
 constraintSet.applyTo(constraintLayout) 50
  13. private fun addRowItem(view: View) {
 …
 constraintLayout.addView(view)
 
 val id

    = view.id
 
 // Initialize width and height of new view.
 constraintSet.constrainWidth(id, MATCH_CONSTRAINT)
 constraintSet.constrainHeight(id, rowHeight)
 
 // Constrain new view vertically.
 val target = if (lastRowId  PARENT_ID) TOP else BOTTOM
 constraintSet.connect(id, TOP, lastRowId, target) 51
  14. // Update current row.
 currentRowIds.add(id)
 // Re-create horizontal chain with

    other row items.
 constraintSet.createHorizontalChainRtl(
 PARENT_ID, START,
 PARENT_ID, END,
 currentRowIds.toIntArray(), FloatArray(currentRow.size, { 1f }),
 CHAIN_SPREAD_INSIDE)
 
 // Toggle elevation to elevate last added view.
 constraintSet.setElevation(id, resources.getDimension(R.dimen.elevation))
 constraintSet.setElevation(lastViewId, 0f)
 
 // Apply constraints.
 constraintSet.applyTo(constraintLayout) 52
  15. constraintLayout.update { guideline(R.id.content_start, VERTICAL_GUIDELINE, LEFT, getDimenSize(R.dimen.keyline_start)) guideline(R.id.content_top, HORIZONTAL_GUIDELINE, TOP, getDimenSize(R.dimen.content_padding_top))

    constrain(R.id.image) { width = MATCH_CONSTRAINT_SPREAD height = MATCH_CONSTRAINT_SPREAD start = START of PARENT_ID top = TOP of PARENT_ID end = END of PARENT_ID bottom = BOTTOM of PARENT_ID } constrain(R.id.title) { width = WRAP_CONTENT height = WRAP_CONTENT end = END of R.id.content_start top = TOP of R.id.content_top } constrain(R.id.artist) { width = WRAP_CONTENT height = WRAP_CONTENT start = END of R.id.title top = BOTTOM of R.id.title } } 54 CONSTRAINT SET DSL github.com/queencodemonkey/the-road-to-kotlintown-ii
  16. REFERENCES 59 CONSTRAINT LAYOUT APIS DOCUMENTATION https://developer.android.com/reference/android/support/constraint/package-summary.html BUILD A RESPONSIVE

    UI WITH CONSTRAINTLAYOUT developer.android.com/training/constraint-layout/index.html ANDROID DEVELOPERS BACKSTAGE: EPISODE 50: CONSTRAINT LAYOUT androidbackstage.blogspot.com/2016/06/episode-50-constraint-layout.html USING CONSTRAINTLAYOUT TO DESIGN YOUR VIEWS | CODE LABS codelabs.developers.google.com/codelabs/constraint-layout/index.html ANDROID LAYOUTS: A NEW WORLD | GOOGLE I/O 2016 https://youtu.be/sO9aX87hq9c ADVANCED ANIMATIONS & CONSTRAINTLAYOUT https://speakerdeck.com/camaelon/advanced-animations-and-constraintlayout ADVANCED CONSTRAINTLAYOUT http://cfp.devoxx.us/2017/talk/XOD-8930/Advanced_ConstraintLayout
  17. REFERENCES 60 CONSTRAINTLAYOUT https://speakerdeck.com/writtmeyer/constraintlayout-1 CONSTRAINTLAYOUT – PART 1 blog.stylingandroid.com/constraintlayout-part-1/ CONSTRAINTLAYOUT,

    INSIDE AND OUT: PART 1 http://wiresareobsolete.com/2016/07/constraintlayout-part-1/ SOME THOUGHTS ON ANDROID’S NEW CONSTRAINTLAYOUT AND ANDROID STUDIO’S NEW DESIGN EDITOR http://www.grokkingandroid.com/thoughts-on-constraintlayout-and-design-editor/ BUILD A UI WITH LAYOUT EDITOR developer.android.com/studio/write/layout-editor.html WHAT'S NEW IN ANDROID DEVELOPMENT TOOLS | GOOGLE I/O 2016 https://youtu.be/csaXml4xtN8 THE EXPERTS' GUIDE TO ANDROID DEVELOPMENT TOOLS | GOOGLE I/O 2016 https://youtu.be/hHnTIMjd1Y8 JOHN HOFORD & NICOLAS ROARD : CONSTRAINTLAYOUT | ANDROID DIALOGS https://youtu.be/hHnTIMjd1Y8