android material design之BottomSheet（六）

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这个控件在手机迅雷中用的挺多的，而且用的地方和位置也很合适，楼主在这里简单写了一下，可以当做一个dialog用，但是又比dialog好用，至于为什么好用大家看到xml后应该会感觉出来的，

上代码

activity

package com.fanyafeng.materialdesign.activity;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.design.widget.BottomSheetBehavior;import android.support.design.widget.FloatingActionButton;import android.support.design.widget.Snackbar;import android.support.v4.view.ViewCompat;import android.support.v4.widget.NestedScrollView;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.view.View;import com.fanyafeng.materialdesign.BaseActivity;import com.fanyafeng.materialdesign.R;public class BottomSheetActivity extends BaseActivity {    private NestedScrollView nestedBottom;    private BottomSheetBehavior bottomSheetBehavior;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_bottom_sheet);        title = "测试bottom sheet";        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)                        .setAction("Action", null).show();            }        });        initView();        initData();    }    private void initView() {        nestedBottom = (NestedScrollView) findViewById(R.id.nestedBottom);    }    private void initData() {        initNest(nestedBottom);    }    private void initNest(final View view) {        bottomSheetBehavior = BottomSheetBehavior.from(view);        bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);        bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {            @Override            public void onStateChanged(@NonNull View bottomSheet, int newState) {                if (newState == BottomSheetBehavior.STATE_COLLAPSED || newState == BottomSheetBehavior.STATE_HIDDEN) {                    view.setVisibility(View.GONE);                }            }            @Override            public void onSlide(@NonNull View bottomSheet, float slideOffset) {                view.setVisibility(View.VISIBLE);                ViewCompat.setAlpha(view, slideOffset);            }        });    }    @Override    public void onClick(View v) {        super.onClick(v);        switch (v.getId()) {            case R.id.btnBottomPop:                if (bottomSheetBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED) {                    bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);                } else {                    bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);                }                break;        }    }}

来看xml

<?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"    android:fitsSystemWindows="true"    tools:context="com.fanyafeng.materialdesign.activity.BottomSheetActivity">    <android.support.design.widget.AppBarLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:theme="@style/AppTheme.AppBarOverlay">        <android.support.v7.widget.Toolbar            android:id="@+id/toolbar"            android:layout_width="match_parent"            android:layout_height="?attr/actionBarSize"            android:background="?attr/colorPrimary"            app:layout_scrollFlags="scroll|exitUntilCollapsed"            app:popupTheme="@style/AppTheme.PopupOverlay" />    </android.support.design.widget.AppBarLayout>    <include layout="@layout/content_bottom_sheet" />    <!--父控件必须是CoordinatorLayout-->    <android.support.v4.widget.NestedScrollView        android:id="@+id/nestedBottom"        android:layout_width="match_parent"        android:layout_height="wrap_content"        app:layout_behavior="@string/bottom_sheet_behavior">        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_marginTop="?attr/actionBarSize"            android:orientation="vertical">            <TextView                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/colorPrimary"                android:padding="80dp"                android:text="人不会死在绝境，却往往栽在十字路口"                android:textColor="@android:color/white" />            <TextView                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/colorPrimary"                android:padding="80dp"                android:text="人不会死在绝境，却往往栽在十字路口"                android:textColor="@android:color/white" />            <TextView                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/colorPrimary"                android:padding="80dp"                android:text="人不会死在绝境，却往往栽在十字路口"                android:textColor="@android:color/white" />            <TextView                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/colorPrimary"                android:padding="80dp"                android:text="人不会死在绝境，却往往栽在十字路口"                android:textColor="@android:color/white" />            <TextView                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/colorPrimary"                android:padding="80dp"                android:text="人不会死在绝境，却往往栽在十字路口"                android:textColor="@android:color/white" />            <TextView                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/colorPrimary"                android:padding="80dp"                android:text="人不会死在绝境，却往往栽在十字路口"                android:textColor="@android:color/white" />            <TextView                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/colorPrimary"                android:padding="80dp"                android:text="人不会死在绝境，却往往栽在十字路口"                android:textColor="@android:color/white" />        </LinearLayout>    </android.support.v4.widget.NestedScrollView>    <android.support.design.widget.FloatingActionButton        android:id="@+id/fab"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="bottom|end"        android:layout_margin="@dimen/fab_margin"        android:src="@android:drawable/ic_dialog_email" /></android.support.design.widget.CoordinatorLayout>

<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.NestedScrollView 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"    <pre name="code" class="html">app:layout_behavior="@string/appbar_scrolling_view_behavior"

tools:context="com.fanyafeng.materialdesign.activity.BottomSheetActivity" tools:showIn="@layout/activity_bottom_sheet"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:id="@+id/btnBottomPop" android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="onClick" android:text="弹出" android:textColor="?attr/colorPrimaryDark" android:textSize="@dimen/activity_horizontal_margin" /> </LinearLayout></android.support.v4.widget.NestedScrollView>

其中的layout_behavior很重要

app:layout_behavior="@string/appbar_scrolling_view_behavior"

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