问题描述
1.recyclerview的使用gridlayoutManager布局，每行有四个元素。布局的item使用framelayout作为根布局的时候没有卡顿的现象，在使用ConstraintLayout作为根布局的时候就会卡顿，检测发现cpu消耗比较厉害。
2.
第一种布局：<FrameLayoutxmlns:android='http://schemas.android.com/apk/res/android'xmlns:app='http://schemas.android.com/apk/res-auto'xmlns:tools='http://schemas.android.com/tools'android:layout_width='match_parent'android:layout_height='100dp'tools:layout_editor_absoluteX='0dp'tools:layout_editor_absoluteY='81dp'><ImageView android: android:layout_width='match_parent' android:layout_height='match_parent' android:layout_marginBottom='0dp' android:layout_marginEnd='0dp' android:layout_marginLeft='0dp' android:layout_marginRight='0dp' android:layout_marginStart='0dp' android:layout_marginTop='0dp' android:background='#dadada' android:clickable='false' android:contentDescription='@string/app_name' android:focusable='false' android:scaleType='centerInside' app:layout_constraintBottom_toBottomOf='parent' app:layout_constraintDimensionRatio='1:1' app:layout_constraintHorizontal_bias='0.0' app:layout_constraintLeft_toLeftOf='parent' app:layout_constraintRight_toRightOf='parent' app:layout_constraintTop_toTopOf='parent' app:layout_constraintVertical_bias='0.0'/><View android: android:layout_width='0dp' android:layout_height='0dp' android:layout_marginBottom='0dp' android:layout_marginEnd='0dp' android:layout_marginLeft='0dp' android:layout_marginRight='0dp' android:layout_marginStart='0dp' android:layout_marginTop='0dp' android:background='@color/black_alpha_80' android:clickable='false' android:focusable='false' android:visibility='gone' app:layout_constraintBottom_toBottomOf='@+id/iv_image' app:layout_constraintDimensionRatio='h,1:1' app:layout_constraintLeft_toLeftOf='@+id/iv_image' app:layout_constraintRight_toRightOf='@+id/iv_image' app:layout_constraintTop_toTopOf='@+id/iv_image'/><ImageView android: android:layout_width='20dp' android:layout_height='20dp' android:layout_gravity='top|right' android:layout_marginRight='8dp' android:layout_marginTop='8dp' android:clickable='false' android:contentDescription='@string/app_name' android:focusable='false' android:scaleType='centerInside' android:src='https://www.6hehe.com/wenda/@drawable/cb_select_image_check_selector' app:layout_constraintRight_toRightOf='parent' app:layout_constraintTop_toTopOf='parent' tools:ignore='RtlHardcoded'/></FrameLayout>第二种布局<android.support.constraint.ConstraintLayoutxmlns:android='http://schemas.android.com/apk/res/android'xmlns:app='http://schemas.android.com/apk/res-auto'xmlns:tools='http://schemas.android.com/tools'android:layout_width='match_parent'android:layout_height='wrap_content'><ImageView android: android:layout_width='0dp' android:layout_height='0dp' android:background='#dadada' android:clickable='false' android:contentDescription='@string/app_name' android:focusable='false' android:scaleType='fitXY' app:layout_constraintBottom_toBottomOf='parent' app:layout_constraintDimensionRatio='1:1' app:layout_constraintHorizontal_bias='0.0' app:layout_constraintLeft_toLeftOf='parent' app:layout_constraintRight_toRightOf='parent' app:layout_constraintTop_toTopOf='parent' app:layout_constraintVertical_bias='0.0' tools:layout_constraintBottom_creator='1' tools:layout_constraintLeft_creator='1' tools:layout_constraintRight_creator='1' tools:layout_constraintTop_creator='1'/><View android: android:layout_width='0dp' android:layout_height='0dp' android:background='@color/black_alpha_80' android:clickable='false' android:focusable='false' android:visibility='gone' app:layout_constraintBottom_toBottomOf='@+id/iv_image' app:layout_constraintDimensionRatio='h,1:1' app:layout_constraintLeft_toLeftOf='@+id/iv_image' app:layout_constraintRight_toRightOf='@+id/iv_image' app:layout_constraintTop_toTopOf='@+id/iv_image' tools:layout_constraintTop_creator='1' tools:layout_constraintRight_creator='1' tools:layout_constraintBottom_creator='1' tools:layout_constraintLeft_creator='1'/><ImageView android: android:layout_width='20dp' android:layout_height='20dp' android:layout_gravity='top|right' android:layout_marginRight='8dp' android:layout_marginTop='8dp' android:clickable='false' android:contentDescription='@string/app_name' android:focusable='false' android:scaleType='centerInside' android:src='https://www.6hehe.com/wenda/@drawable/cb_select_image_check_selector' app:layout_constraintRight_toRightOf='parent' app:layout_constraintTop_toTopOf='parent' tools:ignore='RtlHardcoded' android:layout_marginEnd='8dp'/></android.support.constraint.ConstraintLayout>
问题解答
回答1：同样是替换item rootlayout为constraintlayout，我发现它并不能填充item。。。？你的在布局上很正常吗？
