resolve comments

constraintlayout/constraintlayout/src/main/java/androidx/constraintlayout/widget/ConstraintLayout.java

@@ -1790,7 +1790,7 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         if (mMetrics != null) {
             time = System.nanoTime();
             mMetrics.mChildCount = getChildCount();
-            mMetrics.mMeasureCalls ++;
+            mMetrics.mMeasureCalls++;
         }
         mDirtyHierarchy |= dynamicUpdateConstraints(widthMeasureSpec,  heightMeasureSpec);
 

constraintlayout/constraintlayout/src/main/java/androidx/constraintlayout/widget/ConstraintLayoutStatistics.java

@@ -99,10 +99,17 @@ public ConstraintLayoutStatistics clone() {
         return new ConstraintLayoutStatistics(this);
     }
 
-    private String fmt(DecimalFormat df, float val, int sp) {
-        String s = new String(new char[sp]).replace('\0', ' ');
+    /**
+     * Format a float value outputting a string of fixed length
+     * @param df format to use
+     * @param val
+     * @param length
+     * @return
+     */
+    private String fmt(DecimalFormat df, float val, int length) {
+        String s = new String(new char[length]).replace('\0', ' ');
         s = (s + df.format(val));
-        return s.substring(s.length() - sp);
+        return s.substring(s.length() - length);
     }
 
     /**
@@ -134,6 +141,12 @@ private void log(String tag) {
         Log.v(tag, log( NUMBER_OF_SIMPLE_EQUATIONS));
     }
 
+    /**
+     * Generate a formatted String for the parameter formatting as a float
+     * @param df
+     * @param param
+     * @return
+     */
     private String log(DecimalFormat df, int param) {
         String value = fmt(df, getValue(param) * 1E-6f, 7);
 
@@ -143,6 +156,12 @@ private String log(DecimalFormat df, int param) {
         title += " = ";
         return "CL Perf: " + title + value;
     }
+
+    /**
+     * Generate a formatted String for the parameter
+     * @param param
+     * @return
+     */
     private String log(int param) {
         String value = Long.toString(this.getValue(param));
         String title = geName(param);
@@ -152,6 +171,13 @@ private String log(int param) {
         return "CL Perf: " + title + value;
     }
 
+    /**
+     * Generate a float formatted String for the parameter comparing current value with value in relative
+     * @param df Format the float using this
+     * @param relative compare against
+     * @param param the parameter to compare
+     * @return
+     */
     private String compare(DecimalFormat df,  ConstraintLayoutStatistics relative, int param) {
         String value = fmt(df, getValue(param) * 1E-6f, 7);
         value += " -> " + fmt(df, relative.getValue(param) * 1E-6f, 7) + "ms";
@@ -162,6 +188,12 @@ private String compare(DecimalFormat df,  ConstraintLayoutStatistics relative, i
         return "CL Perf: " + title + value;
     }
 
+    /**
+     * Generate a formatted String for the parameter comparing current value with value in relative
+     * @param relative compare against
+     * @param param the parameter to compare
+     * @return
+     */
     private String compare(ConstraintLayoutStatistics relative, int param) {
         String value = this.getValue(param) + " -> " + relative.getValue(param);
         String title = geName(param);

constraintlayout/core/src/main/java/androidx/constraintlayout/core/LinearSystem.java

@@ -31,7 +31,6 @@ public class LinearSystem {
     public static final boolean FULL_DEBUG = false;
     public static final boolean DEBUG = false;
     private static final boolean DO_NOT_USE = false;
-   // public static final boolean MEASURE = false;
 
     private static final boolean DEBUG_CONSTRAINTS = FULL_DEBUG;
 

constraintlayout/core/src/main/java/androidx/constraintlayout/core/Metrics.java

@@ -64,9 +64,9 @@ public class Metrics {
     public long mMeasureDuration; // time spent in measure in nanoseconds
     public long mChildCount; // number of child Views of ConstraintLayout
     public long mMeasureCalls; // number of time CL onMeasure is called
-    public long  mSolverPasses;
-    public long  mEquations;
-    public long  mVariables;
+    public long mSolverPasses;
+    public long mEquations;
+    public long mVariables;
     public long mSimpleEquations;
 
     // @TODO: add description
@@ -126,15 +126,19 @@ public void reset() {
         mEquations = 0;
         mSimpleEquations = 0;
     }
-
+
+    /**
+     * Copy the values from and existing Metrics class
+     * @param metrics
+     */
     public void copy(Metrics metrics) {
         mVariables = metrics.mVariables;
         mEquations = metrics.mEquations;
         mSimpleEquations = metrics.mSimpleEquations;
         mNumberOfMeasures = metrics.mNumberOfMeasures;
         mNumberOfLayouts = metrics.mNumberOfLayouts;
         mMeasureDuration = metrics.mMeasureDuration;
-        mChildCount =  metrics.mChildCount;
+        mChildCount = metrics.mChildCount;
         mMeasureCalls = metrics.mMeasureCalls;
         measuresWidgetsDuration = metrics.measuresWidgetsDuration;
         mSolverPasses = metrics.mSolverPasses;

projects/MotionLayoutVerification/app/src/main/java/android/support/constraint/app/CheckPerformanceMetric.java

@@ -32,11 +32,11 @@
  */
 public class CheckPerformanceMetric extends AppCompatActivity {
     private static final String TAG = "CheckPerformanceMetric";
-    String layout_name;
-    ConstraintLayout mConstraintLayout;
-    ConstraintLayoutStatistics performance;
-    ConstraintLayoutStatistics prePerformance;
-    int loop;
+    String layout_name = null;
+    ConstraintLayout mConstraintLayout = null;
+    ConstraintLayoutStatistics performance = null;
+    ConstraintLayoutStatistics prePerformance = null;
+    int loop = 0;
 
     @Override
     protected void onCreate(@Nullable @org.jetbrains.annotations.Nullable Bundle savedInstanceState) {