如何在Modal BottomSheet對話框中添加底部佈局？

Question

我想用BottomSheetDialogFragment來實現這樣的設計。但問題是當我拖動底部佈局滾動。我希望底部佈局總是處於底部，直到BottomSheetDialogFragment被解僱。

請找到截圖

這裏是我的代碼

bottomsheet_layout.xml

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 
     <!--The main content goes over here--> 
    </LinearLayout> 

    <!--The footer view--> 
    <LinearLayout 
     android:id="@+id/footer_purchase_layout" 
     android:layout_width="match_parent" 
     android:layout_height="52dp" 
     android:layout_gravity="bottom" 
     android:orientation="horizontal" 
     android:weightSum="1"> 

     <TextView 
      android:id="@+id/txt_cancel_purchase" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:layout_weight="0.5" 
      android:gravity="left|center_vertical" 
      android:text="CLOSE" 
      android:textSize="14sp" /> 

     <TextView 
      android:id="@+id/txt_item_purchase_action" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:layout_weight="0.5" 
      android:gravity="right|center_vertical" 
      android:text="ADD STICKERS" 
      android:textSize="14sp" /> 

    </LinearLayout> 
</FrameLayout> 

ModalBottomSheetFragment.java

public class ModalBottomSheetFragment extends BottomSheetDialogFragment { 

    public ModalBottomSheetFragment() {} 

    private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() { 

     @Override 
     public void onStateChanged(@NonNull View bottomSheet, int newState) { 
      if (newState == BottomSheetBehavior.STATE_HIDDEN) { 
       dismiss(); 
      } 
     } 

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

    @TargetApi(Build.VERSION_CODES.LOLLIPOP_MR1) 
    @Override 
    public void setupDialog(Dialog dialog, int style) { 
     super.setupDialog(dialog, style); 

     View mContentView = View.inflate(getContext(), R.layout.bottomsheet_layout, null); 
     dialog.setContentView(mContentView); 
     CoordinatorLayout.LayoutParams layoutParams = 
       (CoordinatorLayout.LayoutParams) ((View) mContentView.getParent()).getLayoutParams(); 
     CoordinatorLayout.Behavior mBehavior = layoutParams.getBehavior(); 
     if (mBehavior != null && mBehavior instanceof BottomSheetBehavior) { 
      ((BottomSheetBehavior) mBehavior).setBottomSheetCallback(mBottomSheetBehaviorCallback); 
      int height = getScreenHeight(getActivity()); 
      final double desiredHeight = 0.85 * height; 
      mContentView.getLayoutParams().height = height; 
      ((BottomSheetBehavior) mBehavior).setPeekHeight((int) desiredHeight); 

     } 
    } 

    public static int getScreenHeight(Context ctx) { 
     DisplayMetrics metrics = ctx.getResources().getDisplayMetrics(); 
     return metrics.heightPixels; 
    } 
} 

MainActivity.java

public class MainActivity extends AppCompatActivity { 

    private Button mShowBottomSheetDialog; 
    private BottomSheetDialogFragment bottomSheetDialogFragment; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     mShowBottomSheetDialog = (Button) findViewById(R.id.showBottomSheet); 
     mShowBottomSheetDialog.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       bottomSheetDialogFragment = new ModalBottomSheetFragment(); 
       bottomSheetDialogFragment.show(getSupportFragmentManager(), bottomSheetDialogFragment.getTag()); 
      } 
     }); 
    } 
} 

Answer 1

使用此佈局，而不是你的佈局....

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

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

     <ScrollView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 


    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="10" 
     android:orientation="vertical"> 
     <!--The main content goes over here--> 
    </LinearLayout> 

    </ScrollView> 

    <!--The footer view--> 
    <LinearLayout 
     android:id="@+id/footer_purchase_layout" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:orientation="horizontal" 
     android:weightSum="1"> 

     <TextView 
      android:id="@+id/txt_cancel_purchase" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:layout_weight="0.5" 
      android:gravity="left|center_vertical" 
      android:text="CLOSE" 
      android:textSize="14sp" /> 

     <TextView 
      android:id="@+id/txt_item_purchase_action" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:layout_weight="0.5" 
      android:gravity="right|center_vertical" 
      android:text="ADD STICKERS" 
      android:textSize="14sp" /> 

    </LinearLayout> 
    </LinearLayout> 
</FrameLayout> 

注： - 體重將您的佈局到不同的視圖，其是在不斷你的佈局......