BottomSheet View Android

Question

我在我的項目中集成了底部視圖。我想打開底部表單視圖，點擊按鈕到屏幕高度的50％，然後用戶可以通過拖動到父級高度或摺疊到底部來拉動底部表單視圖。

我試過了，但是當我點擊按鈕打開它的底部表單正在取得父母的全部高度。

XML代碼：

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout 
    android:id="@+id/mainOuterLinearLayout" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

    <include layout="@layout/app_bar"/> 

    <android.support.design.widget.CoordinatorLayout 
     android:id="@+id/mainOuterLayout" 
     android:layout_width="match_parent" 
     android:layout_height="fill_parent"> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:orientation="vertical"> 

      <LinearLayout 
       android:id="@+id/linearLayoutOverFlowButtons" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:gravity="center" 
       android:orientation="horizontal" 
       android:paddingBottom="0dp" 
       android:paddingLeft="5dp" 
       android:paddingRight="5dp" 
       android:paddingTop="5dp" 
       android:weightSum="5"> 


       <Button 
        android:id="@+id/buttonDownloadDocument" 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_horizontal" 
        android:layout_marginLeft="5dp" 
        android:layout_weight="2" 
        android:background="@drawable/button_shape" 
        android:clickable="false" 
        android:minHeight="35dp" 
        android:minWidth="45dp" 
        android:text="Download Document" 
        android:textColor="@color/white" 
        android:textSize="12dp"/> 

       <Button 
        android:id="@+id/buttonRequestDocument" 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_horizontal" 
        android:layout_marginLeft="5dp" 
        android:layout_marginRight="5dp" 
        android:layout_weight="2" 
        android:background="@drawable/button_shape" 
        android:clickable="false" 
        android:minHeight="35dp" 
        android:minWidth="45dp" 
        android:text="Request Document" 
        android:textColor="@color/white" 
        android:textSize="12dp"/> 

       <Button 
        android:id="@+id/buttonFeedBack" 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_horizontal" 
        android:layout_marginRight="5dp" 
        android:layout_weight="1" 
        android:background="@drawable/button_shape" 
        android:clickable="false" 
        android:minHeight="35dp" 
        android:minWidth="45dp" 
        android:text="Feedback" 
        android:textColor="@color/white" 
        android:textSize="12dp"/> 

      </LinearLayout> 
     </LinearLayout> 

     <android.support.v4.widget.NestedScrollView 
      android:id="@+id/bottom_sheet" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      app:behavior_peekHeight="300dp" 
      android:background="@android:color/holo_orange_light" 
      android:clipToPadding="true" 
      app:layout_behavior="android.support.design.widget.BottomSheetBehavior"> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:padding="16dp" 
       android:text="Test" 
       android:textSize="16sp"/> 

     </android.support.v4.widget.NestedScrollView> 

    </android.support.design.widget.CoordinatorLayout> 
</LinearLayout> 

代碼：

private void addBottomSheetCode() { 
     //CoordinatorLayout coordinatorLayout = (CoordinatorLayout) findViewById(R.id.mainOuterLayout); 
     // The View with the BottomSheetBehavior 
     bottom_sheet = mainOuterLayout.findViewById(R.id.bottom_sheet); 
     behavior = BottomSheetBehavior.from(bottom_sheet); 
     behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() { 
      @Override 
      public void onStateChanged(View bottomSheet, int newState) { 
       if (newState == BottomSheetBehavior.STATE_COLLAPSED) { 
        behavior.setPeekHeight(0); 
       } 
      } 

      @Override 
      public void onSlide(View bottomSheet, float slideOffset) { 
      } 
     }); 
    } 


private void onClickButtonFeedBack() { 
     buttonFeedBack.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       DisplayMetrics displaymetrics = new DisplayMetrics(); 
       getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); 
       int height = displaymetrics.heightPixels; 
       int width = displaymetrics.widthPixels; 

       /*bottom_sheet.getLayoutParams().height = height/2; 
       bottom_sheet.requestLayout();*/ 
       behavior.setPeekHeight(300); 
       behavior.setState(BottomSheetBehavior.STATE_EXPANDED); 


      } 
     }); 
    } 

Answer 1

請在下面找到更新的代碼不工作：

private void onClickButtonFeedBack() { 
      buttonFeedBack.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        DisplayMetrics displaymetrics = new DisplayMetrics(); 
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); 
        int height = displaymetrics.heightPixels; 
        int width = displaymetrics.widthPixels; 

        int mheight = height - getSupportActionBar().getHeight(); 
        behavior.setPeekHeight(mheight); 
        behavior.setState(BottomSheetBehavior.STATE_EXPANDED); 


       } 
      }); 

佈局

<android.support.v4.widget.NestedScrollView 
      android:id="@+id/bottom_sheet" 
      android:layout_width="match_parent" 
      android:layout_height="300dp" 
      android:background="@color/bottom_sheet_view_color" 
      android:clipToPadding="true" 
      app:layout_behavior="android.support.design.widget.BottomSheetBehavior"> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:padding="16dp" 
       android:text="Test" 
       android:textSize="16sp"/> 

     </android.support.v4.widget.NestedScrollView>