AndroidのAppbarlayoutに大きなテキストの高さの問題があります

Question

AppbarlayoutにはTextViewに多数のテキストが含まれている可能性があります。

TextViewは2行ですべてOKですが、TextViewを展開するとAppbarlayoutがカットされ、残りの部分が空白になります。

ノーマル：

は拡張：

を上にスクロール：

レイアウトコード：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 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"> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/view_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:background="?attr/colorPrimary" 
     app:popupTheme="@style/ThemeOverlay.AppCompat.Light" /> 

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

     <android.support.design.widget.AppBarLayout 
      android:id="@+id/appbar" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@android:color/black" 
      app:elevation="0dp" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light"> 

      <LinearLayout 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:background="@android:color/holo_green_dark" 
       app:layout_scrollFlags="scroll"> 

       <TextView 
        android:id="@+id/text" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:layout_marginTop="200dp" 
        android:maxLines="2" 
        android:text="test" /> 

      </LinearLayout> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="50dp" 
       android:background="@android:color/holo_blue_bright" 
       android:text="TAB" /> 

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

     <android.support.v4.widget.NestedScrollView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:background="@android:color/holo_orange_light" 
      app:layout_behavior="@string/appbar_scrolling_view_behavior"> 

      <android.support.v4.view.ViewPager 
       android:id="@+id/pager" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" /> 
     </android.support.v4.widget.NestedScrollView> 
    </android.support.design.widget.CoordinatorLayout> 
</LinearLayout> 

アクティビティコード：

package me.ffts.demo; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.TextView; 

public class MainActivity extends AppCompatActivity { 

    boolean isOpen = false; 
    TextView text; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     text = (TextView) findViewById(R.id.text); 
     text.setText("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"); 
     text.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if (isOpen) { 
        text.setMaxLines(2); 
        isOpen = false; 
       } else { 
        text.setMaxLines(Integer.MAX_VALUE); 
        isOpen = true; 
       } 
      } 
     }); 
    } 
} 

これはAppbarLayoutまたはCoordinatorLayoutのバグですか？

Answer 1

AppBarLayoutが高さを切り捨てているようです。 android:layout_heightを2000 dpのような大規模なコードにハードコードすると、すべてが描画されていることがわかります。私はAppBarLayoutにすべての子を測定させ、その高さを設定することで問題を解決しました。

public class HeightWrappingAppBarLayout extends AppBarLayout { 

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

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     int height = 0; 
     for (int i = 0; i < getChildCount(); i++) { 
      View child = getChildAt(i); 
      if (child.getVisibility() != GONE) { 
       measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0); 
       height += child.getMeasuredHeight(); 
      } 
     } 
     int width = MeasureSpec.getSize(widthMeasureSpec); 
     setMeasuredDimension(width, height); 
    } 
} 

Answer 2

高さはMeasureSpec.UNSPECIFIEDを使用してください。

public class ScrollAppBarLayout extends AppBarLayout { 
    public ScrollAppBarLayout(Context context) { 
     super(context); 
    } 

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

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     super.onMeasure(widthMeasureSpec, 
       MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(heightMeasureSpec), MeasureSpec.UNSPECIFIED)); 
    } 

    @Override 
    protected void measureChild(View child, int parentWidthMeasureSpec, 
           int parentHeightMeasureSpec) { 
     ViewGroup.LayoutParams lp = child.getLayoutParams(); 

     int childWidthMeasureSpec; 
     int childHeightMeasureSpec; 

     childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, getPaddingLeft() 
       + getPaddingRight(), lp.width); 

     childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
       MeasureSpec.getSize(parentHeightMeasureSpec), MeasureSpec.UNSPECIFIED); 

     child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 
    } 

    @Override 
    protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 
              int parentHeightMeasureSpec, int heightUsed) { 
     final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 

     final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 
       getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin 
         + widthUsed, lp.width); 
     final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
       MeasureSpec.getSize(parentHeightMeasureSpec), MeasureSpec.UNSPECIFIED); 

     child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 
    } 
}