ConstraintLayout
ViewGroup
Canvas
View
LinearLayout
RelativeLayout
<RelativeLayout> <ImageView /> <ImageView /> <RelativeLayout> <TextView /> <LinearLayout> <TextView /> <RelativeLayout> <EditText /> </RelativeLayout> </LinearLayout> <LinearLayout> <TextView /> <RelativeLayout> <EditText /> </RelativeLayout> </LinearLayout> <TextView /> </RelativeLayout> <LinearLayout > <Button /> <Button /> </LinearLayout> </RelativeLayout>
python $ANDROID_HOME/platform-tools/systrace/systrace.py --time=20 -o ~/trace.html gfx view res
<android.support.constraint.ConstraintLayout> <ImageView /> <ImageView /> <TextView /> <EditText /> <TextView /> <TextView /> <EditText /> <Button /> <Button /> <TextView /> </android.support.constraint.ConstraintLayout>
TextView
EditText
<LinearLayout android:id="@+id/camera_area" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_below="@id/title" > <TextView android:text="@string/camera" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:id="@+id/cameraLabel" android:labelFor="@+id/cameraType" android:layout_marginStart="16dp" /> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <EditText android:id="@+id/cameraType" android:ems="10" android:inputType="textPersonName" android:text="@string/camera_value" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_marginTop="8dp" android:layout_marginStart="8dp" android:layout_marginEnd="8dp" /> </RelativeLayout> </LinearLayout>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintLeft_creator="1" app:layout_constraintBaseline_creator="1" app:layout_constraintLeft_toLeftOf="@+id/activity_main_done" app:layout_constraintBaseline_toBaselineOf="@+id/cameraType" />
OnFrameMetricsAvailableListener
window.addOnFrameMetricsAvailableListener( frameMetricsAvailableListener, frameMetricsHandler);
frameMetricsAvailableListener()
FrameMetrics.LAYOUT_MEASURE_DURATION
Window.OnFrameMetricsAvailableListener { _, frameMetrics, _ -> val frameMetricsCopy = FrameMetrics(frameMetrics); // Layout measure duration in nanoseconds val layoutMeasureDurationNs = frameMetricsCopy.getMetric(FrameMetrics.LAYOUT_MEASURE_DURATION);
FrameMetrics
