Java BottomSheetDialogFragment设置峰值和其他行为

我想底部屏幕偷看，然后采取了全屏幕时，滑了起来。目前，当我按下“按钮1”时，它会显示出来，因为我无法让窥视开始工作

但是，我可以将其向上滑动，使其占据整个屏幕。理想情况下，它会自动执行此操作

当我把它滑下来的时候，它会一直滑下去

我想要以下行为：

底部板材应始终窥视

300dp

或任何东西

在底部纸张上向上滑动会导致它占据全屏视图，如第二张图片所示

向下滑动底部板材时，应回到其窥视高度

我不知道如何控制底部工作表行为，因为

BottomSheetBehavior

类似乎只适用于XML中定义的那些

活动\u main.xml

<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:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:paddingTop="24dp">

        <Button
            android:id="@+id/button_1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Button 1"
            android:padding="16dp"
            android:layout_margin="8dp"
            android:textColor="@android:color/white"
            android:background="@android:color/holo_green_dark"/>

            // ... 
    </LinearLayout>

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

<RelativeLayout
    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="match_parent"
    android:clipToPadding="true"
    android:background="@android:color/holo_orange_light"
    app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
    >

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

</RelativeLayout>

TestBottomSheetDialogFragment.java

package com.example.qqq.bottomsheets;

import android.os.Bundle;
import android.support.design.widget.BottomSheetBehavior;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private BottomSheetBehavior mBottomSheetBehavior;
    private TestBottomSheetDialogFragment mTestBottomSheetDialogFragment;

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

        Button button1 = (Button) findViewById( R.id.button_1 );
        Button button2 = (Button) findViewById( R.id.button_2 );
        Button button3 = (Button) findViewById( R.id.button_3 );

        mTestBottomSheetDialogFragment = new TestBottomSheetDialogFragment();

        button1.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {

        switch(v.getId()) {
            case R.id.button_1: {
                mTestBottomSheetDialogFragment.show(getSupportFragmentManager(), mTestBottomSheetDialogFragment.getTag());
                break;
            }
        }
    }
}

package com.example.qqq.bottomsheets;

import android.app.Dialog;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.BottomSheetDialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class TestBottomSheetDialogFragment extends BottomSheetDialogFragment {


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return super.onCreateDialog(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_bottom_sheet, container, false);
        return view;
    }

}

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你找到这个案子的解决办法了吗？