解决BottomSheetDialogFragment show()方法 只展示一部分问题

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u013762572/article/details/79648159

问题详细出现以及原因可以参考这篇文章。
主要给出解决方法，主要是针对BottomSheetDialogFragment的显示问题，而非BottomSheetDialog，其实解决方案是类似的。

重写BottomSheetDialog，重新计算peek高度，具体代码如下：

public class FixHeightBottomSheetDialog extends BottomSheetDialog {

    private View mContentView;

    public FixHeightBottomSheetDialog(@NonNull Context context) {
        super(context);
    }

    public FixHeightBottomSheetDialog(@NonNull Context context, int theme) {
        super(context, theme);
    }

    @Override
    protected void onStart() {
        super.onStart();
        fixHeight();
    }

    @Override
    public void setContentView(View view) {
        super.setContentView(view);
        this.mContentView = view ;
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        super.setContentView(view, params);
        this.mContentView = view;
    }

    private void fixHeight(){
        if(null == mContentView){
            return;
        }

        View parent = (View) mContentView.getParent();
        BottomSheetBehavior behavior = BottomSheetBehavior.from(parent);
        mContentView.measure(0, 0);
        behavior.setPeekHeight(mContentView.getMeasuredHeight());

        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) parent.getLayoutParams();
        params.gravity = Gravity.TOP | Gravity.CENTER_HORIZONTAL;
        parent.setLayoutParams(params);
    }
}

然后再继承BottomSheetDialogFragment,重写onCreateDialog方法，替换为上面FixHeightBottomSheetDialog，代码如下：

public class FixBottomSheetDialogFragment extends BottomSheetDialogFragment {

  @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new FixHeightBottomSheetDialog(getContext());
    }
}

那么此时FixBottomSheetDialogFragment.show()就可以显示全部了，问题解决。

FixBottomSheetDialogFragment fragment = new FixBottomSheetDialogFragment();
fragment.show(getSupportFragmentManager(),"myFragment");