我终于从这个解决方案中找到了解决方案在外部区域达到阈值后允许 BottomSheet 向上滑动 https://stackoverflow.com/questions/55068560/allow-bottomsheet-to-slide-up-after-threshold-is-reached-on-an-area-outside
首先，创建自定义 CoordinatorLayout：
public class CustomCoordinatorLayout extends CoordinatorLayout {
private View proxyView;
public CustomCoordinatorLayout(@NonNull Context context) {
super(context);
}
public CustomCoordinatorLayout(
@NonNull Context context,
@Nullable AttributeSet attrs
) {
super(context, attrs);
}
public CustomCoordinatorLayout(
@NonNull Context context,
@Nullable AttributeSet attrs,
int defStyleAttr
) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean isPointInChildBounds(
@NonNull View child,
int x,
int y
) {
if (super.isPointInChildBounds(child, x, y)) {
return true;
}
// we want to intercept touch events if they are
// within the proxy view bounds, for this reason
// we instruct the coordinator layout to check
// if this is true and let the touch delegation
// respond to that result
if (proxyView != null) {
return super.isPointInChildBounds(proxyView, x, y);
}
return false;
}
// for this example we are only interested in intercepting
// touch events for a single view, if more are needed use
// a List<View> viewList instead and iterate in
// isPointInChildBounds
public void setProxyView(View proxyView) {
this.proxyView = proxyView;
}
}
然后创建 CustomBottomSheetBehavior：
public class CustomBottomSheetBehavior<V extends View> extends
BottomSheetBehavior<V> {
// we'll use the device's touch slop value to find out when a tap
// becomes a scroll by checking how far the finger moved to be
// considered a scroll. if the finger moves more than the touch
// slop then it's a scroll, otherwise it is just a tap and we
// ignore the touch events
private int touchSlop;
private float initialY;
private boolean ignoreUntilClose;
public CustomBottomSheetBehavior(
@NonNull Context context,
@Nullable AttributeSet attrs
) {
super(context, attrs);
touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
}
@Override
public boolean onInterceptTouchEvent(
@NonNull CoordinatorLayout parent,
@NonNull V child,
@NonNull MotionEvent event
) {
// touch events are ignored if the bottom sheet is already
// open and we save that state for further processing
if (getState() == STATE_EXPANDED) {
ignoreUntilClose = true;
return super.onInterceptTouchEvent(parent, child, event);
}
switch (event.getAction()) {
// this is the first event we want to begin observing
// so we set the initial value for further processing
// as a positive value to make things easier
case MotionEvent.ACTION_DOWN:
initialY = Math.abs(event.getRawY());
return super.onInterceptTouchEvent(parent, child, event);
// if the last bottom sheet state was not open then
// we check if the current finger movement has exceed
// the touch slop in which case we return true to tell
// the system we are consuming the touch event
// otherwise we let the default handling behavior
// since we don't care about the direction of the
// movement we ensure its difference is a positive
// integer to simplify the condition check
case MotionEvent.ACTION_MOVE:
return !ignoreUntilClose
&& Math.abs(initialY - Math.abs(event.getRawY())) > touchSlop
|| super.onInterceptTouchEvent(parent, child, event);
// once the tap or movement is completed we reset
// the initial values to restore normal behavior
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
initialY = 0;
ignoreUntilClose = false;
return super.onInterceptTouchEvent(parent, child, event);
}
return super.onInterceptTouchEvent(parent, child, event);
}
}`
然后更改布局以使用自定义协调器：
<?xml version="1.0" encoding="utf-8"?>
<com.example.CustomCoordinatorLayout
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:layout_width="match_parent"
android:id="@+id/container"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/player_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/black"
android:fitsSystemWindows="true">
<com.google.android.exoplayer2.ui.PlayerView
android:id="@+id/exo_player"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true"
android:fitsSystemWindows="true"
app:controller_layout_id="@layout/playback_control_view"
app:fastforward_increment="10000"
app:rewind_increment="10000" />
</FrameLayout>
<include layout="@layout/bottom_sheet" />
</com.example.CustomCoordinatorLayout>
将相应的活动更改为：
public class PlayerActivity extends AppCompatActivity{
private CustomCoordinatorLayout customCoordinatorLayout;
private FrameLayout playerContainer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player);
customCoordinatorLayout = findViewById(R.id.container);
playerContainer = findViewById(R.id.player_container);
customCoordinatorLayout.setProxyView(playerContainer);
}}
就是这样！
