Android: Bottom sheet
Bottom sheet是一个从屏幕底部滑出以显示更多内容的控件。你可以在Google Material Design指南找到更详细的信息。
添加资源
添加最新的appcompat 和 design support 库到你的工程:
dependencies {
//replace X.X.X with the latest version
compile 'com.android.support:appcompat-v7:X.X.X'
compile 'com.android.support:design:X.X.X'
}
让你的activity继承AppCompatActivity。
public class ButtonActivity extends AppCompatActivity {
...
}
创建布局
为了方便我们使用include布局的方式。下面这个布局是bottom sheet的内容。对应的文件是 bottom_sheet.xml。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/bottom_sheet"
android:layout_width="match_parent"
android:layout_height="340dp"
android:background="@android:color/darker_gray"
android:orientation="vertical"
app:behavior_hideable="true"
app:behavior_peekHeight="80dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
<TextView
android:layout_width="match_parent"
android:layout_height="80dp"
android:background="@color/colorAccent"
android:gravity="center"
android:text="@string/bottom_sheet_peek"
android:textColor="@android:color/white" />
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="@string/bottom_sheet_content"
android:textColor="@android:color/white" />
</LinearLayout>
behavior_peekHeight: 定义可见部分的高度。
behavior_hideable: 定义是否可以下滑隐藏bottom sheet。
Container 视图
把 CoordinatorLayout添加为root 视图。然后把bottom sheet视图作为直接子View包含在CoordinatorLayout中。 app_bar和activity_bottom_sheet_content布局是其它的View,跟bottom sheet无关。你可以替换或者删除它们。
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:layout_height="match_parent"
tools:context="com.androidsample.BottomSheetActivity">
<!-- include app bar -->
<include layout="@layout/app_bar" />
<!-- include main content -->
<include layout="@layout/activity_bottom_sheet_content" />
<!-- include bottom sheet -->
<include layout="@layout/bottom_sheet" />
</android.support.design.widget.CoordinatorLayout>
此时bottom sheet对话框应该是这样的:
动态控制
bottom sheet对话框的Behavior和属性也可以通过Java代码动态控制。
// get the bottom sheet view
LinearLayout llBottomSheet = (LinearLayout) findViewById(R.id.bottom_sheet);
// init the bottom sheet behavior
BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(llBottomSheet);
// change the state of the bottom sheet
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
// set the peek height
bottomSheetBehavior.setPeekHeight(340);
// set hideable or not
bottomSheetBehavior.setHideable(false);
// set callback for changes
bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, int newState) {
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
}
});
That’s it.
英文原文:https://medium.com/@emrullahluleci/android-bottom-sheet-30284293f066#.ql77m2jun