如何解决在MotionLayout中使用
我想让全屏横屏模式下的PlayerView成为可能，但我无法使其正常工作。到目前为止，当配置更改为横向模式时，我尝试通过编程方式设置playerView布局参数，但是仍然无法正常工作。
我创建的布局
<androidx.constraintlayout.motion.widget.MotionLayout xmlns: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:id="@+id/player_motion_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_collapseMode="parallax"
app:layoutDescription="@xml/vod_player_scene"
app:viewToDetectTouch="@id/top_player_container">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/top_player_container"
android:layout_width="match_parent"
android:layout_height="280dp"
android:background="#272727"
app:layout_constrainedWidth="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.exoplayer2.ui.PlayerView
android:id="@+id/playerView"
android:layout_width="match_parent"
android:layout_height="280dp"
android:focusable="true"
app:controller_layout_id="@layout/exo_playback_control_view_vod"
app:fastforward_increment="10000"
app:hide_on_touch="true"
app:layout_constrainedWidth="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:resize_mode="fixed_width"
app:rewind_increment="10000"
app:show_timeout="2000" />
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="64dp"
android:layout_height="64dp"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="@id/playerView"
app:layout_constraintEnd_toEndOf="@id/playerView"
app:layout_constraintStart_toStartOf="@id/playerView"
app:layout_constraintTop_toTopOf="@id/playerView" />
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/image_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:alpha="0"
app:layout_constraintBottom_toBottomOf="@id/top_player_container"
app:layout_constraintEnd_toStartOf="@id/image_clear"
app:layout_constraintTop_toTopOf="@id/top_player_container"
app:srcCompat="@drawable/ic_play_arrow_32dp"
app:tint="@color/white" />
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/image_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:alpha="0"
android:background="?attr/selectableItemBackgroundBorderless"
app:layout_constraintBottom_toBottomOf="@id/top_player_container"
app:layout_constraintEnd_toEndOf="@id/top_player_container"
app:layout_constraintTop_toTopOf="@id/top_player_container"
app:srcCompat="@drawable/ic_clear_32dp"
app:tint="@color/white" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/video_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:ellipsize="end"
android:fontFamily="@font/montserrat_semi_bold"
android:maxLines="1"
android:textColor="@color/white"
app:layout_constraintBottom_toBottomOf="@id/top_player_container"
app:layout_constraintEnd_toStartOf="@id/image_play"
app:layout_constraintStart_toEndOf="@id/playerView"
app:layout_constraintTop_toTopOf="@id/top_player_container"
tools:text="Blade Runner" />
<FrameLayout
android:id="@+id/recyclerview_container"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@color/video_club_background"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/top_player_container" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerview_front"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="@color/video_club_background"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/top_player_container" />
<ProgressBar
android:id="@+id/recyclerView_progressView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:visibility="gone"
app:layout_constraintEnd_toEndOf="@id/recyclerview_front"
app:layout_constraintStart_toStartOf="@id/recyclerview_front"
app:layout_constraintTop_toTopOf="@id/recyclerview_front" />
</androidx.constraintlayout.motion.widget.MotionLayout>
从编程上来说，我是这样做的（请参见下面的代码）
@Override
public void onConfigurationChanged(@NonNull Configuration newConfig) {
super.onConfigurationChanged(newConfig);
int newOrientation = newConfig.orientation;
if (newOrientation == Configuration.ORIENTATION_LANDSCAPE) {
MotionLayout.LayoutParams params = (MotionLayout.LayoutParams)
getPlayerView().getLayoutParams();
params.width = params.MATCH_PARENT;
params.height = params.MATCH_PARENT;
getPlayerView().setLayoutParams(params);
} else {
}
}
也在Manifest.xml中，我将活动声明为
<activity
android:name=".main.MainActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize|screenLayout|smallestScreenSize|uiMode"
android:label="@string/app_name"
android:theme="@style/MainTheme"
android:windowSoftInputMode="adjustPan" />
让我知道您是否还有其他需要与您分享的内容。 预先感谢。
解决方法
要能够更改以MotionLayout作为父视图的任何视图，我们应该使用MotionScene。
我为解决此问题所做的工作，创建了两个函数，一个使playerView width 和 height 为MATCH_PARENT，另一个函数将其重置为以前的状态（当屏幕方向恢复为纵向时）。
private void setPlayerToMatchHeight() {
ConstraintSet expandedSet = getMotionLayout().getConstraintSet(R.id.expanded);
ConstraintSet.Constraint topPlayerContainerSet = expandedSet.getConstraint(R.id.top_player_container);
topPlayerContainerSet.layout.mHeight = ViewGroup.LayoutParams.MATCH_PARENT;
}
private void setPlayerTo16x9dimensionRatio() {
ConstraintSet expandedSet = getMotionLayout().getConstraintSet(R.id.expanded);
ConstraintSet.Constraint topPlayerContainerSet = expandedSet.getConstraint(R.id.top_player_container);
topPlayerContainerSet.layout.mHeight = 0;
topPlayerContainerSet.layout.dimensionRatio = "16:9";
}
然后，在onConfigurationChanged中，基于newOrientation，我分别调用这些函数。
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