android - 如何让 ScrollView 中 ViewPager 的高度为 MATCH_PARENT？

Question

以前，在 ScrollView 中显示来自 ViewPager 的 Fragment 时遇到问题。问题是因为我们需要为 ViewPager 设置准确的高度。我们不能依赖 WRAP_CONTENT 或 MATCH_PARENT。我用 here 中的代码解决了它.现在，我的问题是，如果 Fragment 的高度不是全屏，我无法在屏幕的空白部分滑动 ViewPager。我只能滑动我的 Fragment 的可见部分。以下是代码。

public class CustomPager extends ViewPager {

    private View mCurrentView;

    public CustomPager(Context context) {
        super(context);
    }

    public CustomPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mCurrentView == null) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
            return;
        }
        int height = 0;
        mCurrentView.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
        int h = mCurrentView.getMeasuredHeight();
        if (h > height) height = h;

        //TODO: if (height < empty space height of a screen) height = empty space height of a screen

        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    public void measureCurrentView(View currentView) {
        mCurrentView = currentView;
        requestLayout();
    }

    public int measureFragment(View view) {
        if (view == null)
            return 0;

        view.measure(0, 0);
        return view.getMeasuredHeight();
    }
}

layout.xml

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

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

        <TextView
            android:id="@+id/text1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/text2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/text3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <com.example.CustomPager
            android:id="@+id/custom_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>
</ScrollView>

Answer 1

试试这个解决方案。

android:fillViewport="true"

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scroll_view"
android:layout_width="match_parent"
android:fillViewport="true"
android:layout_height="match_parent">

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

    <TextView
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/text2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/text3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <chatapp.com.testdemo.CustomPager
        android:id="@+id/custom_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>