带有setAdjustViewBounds的Android ImageView在ConstraintLayout中具有无法解释的行为

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我在ScrollView中有一个android ConstraintLayout。我在布局中添加了几个按钮和一个ImageView。其中一个按钮应限制在ImageView的底部。

这就出现了问题：只要我将图像设置为调整视图的边界（setAdjustViewBounds），图像就会根据需要调整大小，但是应该跟随ImageView的按钮会在图像的底部绘制，不在它下面。

请参阅以下输出：This is how it looks

当我再添加一个按钮时，其定义必须遵循ImageView定义，那么一切看起来都很好，即使它的约束与图像约束无关。如果我在ImageView定义之前移动附加按钮的定义，我再次得到错误的输出，当然还有一个额外的按钮。

这是正确的输出：And this is how it should look

但是我不想在ImageView之后进行任何额外的声明来使布局工作。

有没有人有想法，这里出了什么问题？

这是我的代码产生button2的错误位置（测试2）：

public class MainActivity extends AppCompatActivity {

int id = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ScrollView sv = new ScrollView(this);
    sv.setId(id++);

    ConstraintLayout mainLayout = new ConstraintLayout(this);
    mainLayout.setId(id++);
    mainLayout.setLayoutParams(new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

    Button button = new Button(this);
    button.setId(id++);
    button.setText("Test");
    mainLayout.addView(button);

    Button button1 = new Button(this);
    button1.setId(id++);
    button1.setText("Test 1");
    mainLayout.addView(button1);

    ImageView image = new ImageView(this);
    image.setId(id++);
    image.setImageResource(R.drawable.img);
    image.setBackgroundColor(Color.parseColor("#0000FF"));
    image.setLayoutParams(new ConstraintLayout.LayoutParams(ConstraintLayout.LayoutParams.MATCH_CONSTRAINT, ConstraintLayout.LayoutParams.WRAP_CONTENT));
    image.setAdjustViewBounds(true);
    mainLayout.addView(image);

    Button button2 = new Button(this);
    button2.setId(id++);
    button2.setText("TEST 2");
    mainLayout.addView(button2);

    //getFragmentManager().beginTransaction().add(sv.getId(), BlankFragment.newInstance("Inhalt 1"), "someTag1").commit();

    sv.addView(mainLayout);

    ConstraintSet constraintSet = new ConstraintSet();
    constraintSet.clone(mainLayout);

    constraintSet.constrainWidth(button.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(button.getId(), ConstraintSet.TOP, mainLayout.getId(), ConstraintSet.TOP, 10);
    constraintSet.connect(button.getId(), ConstraintSet.START, mainLayout.getId(), ConstraintSet.START, 50);
    constraintSet.connect(button.getId(), ConstraintSet.END, mainLayout.getId(), ConstraintSet.END, 50);

    constraintSet.constrainWidth(button1.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(button1.getId(), ConstraintSet.TOP, button.getId(), ConstraintSet.BOTTOM, 10);
    constraintSet.connect(button1.getId(), ConstraintSet.START, button.getId(), ConstraintSet.START, 0);
    constraintSet.connect(button1.getId(), ConstraintSet.END, button.getId(), ConstraintSet.END, 700);

    constraintSet.constrainWidth(image.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(image.getId(), ConstraintSet.TOP, button1.getId(), ConstraintSet.BOTTOM, 10);
    constraintSet.connect(image.getId(), ConstraintSet.START, button.getId(), ConstraintSet.START, 100);
    constraintSet.connect(image.getId(), ConstraintSet.END, button.getId(), ConstraintSet.END, 100);

    constraintSet.constrainWidth(button2.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(button2.getId(), ConstraintSet.TOP, image.getId(), ConstraintSet.BOTTOM, 10);
    constraintSet.connect(button2.getId(), ConstraintSet.START, button.getId(), ConstraintSet.START, 0);
    constraintSet.connect(button2.getId(), ConstraintSet.END, button.getId(), ConstraintSet.END, 0);
    constraintSet.connect(button2.getId(), ConstraintSet.BOTTOM, mainLayout.getId(), ConstraintSet.BOTTOM, 10);

    constraintSet.applyTo(mainLayout);


    setContentView(sv);
}

}

这里是带有附加按钮的代码，它将button2移动到正确的位置。没什么特别的，只是额外的按钮。

公共类MainActivity扩展AppCompatActivity {

int id = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ScrollView sv = new ScrollView(this);
    sv.setId(id++);

    ConstraintLayout mainLayout = new ConstraintLayout(this);
    mainLayout.setId(id++);
    mainLayout.setLayoutParams(new ConstraintLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

    Button button = new Button(this);
    button.setId(id++);
    button.setText("Test");
    mainLayout.addView(button);

    Button button1 = new Button(this);
    button1.setId(id++);
    button1.setText("Test 1");
    mainLayout.addView(button1);

    ImageView image = new ImageView(this);
    image.setId(id++);
    image.setImageResource(R.drawable.img);
    image.setBackgroundColor(Color.parseColor("#0000FF"));
    image.setLayoutParams(new ConstraintLayout.LayoutParams(ConstraintLayout.LayoutParams.MATCH_CONSTRAINT, ConstraintLayout.LayoutParams.WRAP_CONTENT));
    image.setAdjustViewBounds(true);
    mainLayout.addView(image);

    //Even when button3 is left inside the example, but its declaration (next four lines) are moved above the imageview-initialization, the error occurs
    Button button3 = new Button(this);
    button3.setId(id++);
    button3.setText("Test 3");
    mainLayout.addView(button3);

    Button button2 = new Button(this);
    button2.setId(id++);
    button2.setText("TEST 2");
    mainLayout.addView(button2);

    //getFragmentManager().beginTransaction().add(sv.getId(), BlankFragment.newInstance("Inhalt 1"), "someTag1").commit();

    sv.addView(mainLayout);

    ConstraintSet constraintSet = new ConstraintSet();
    constraintSet.clone(mainLayout);

    constraintSet.constrainWidth(button.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(button.getId(), ConstraintSet.TOP, mainLayout.getId(), ConstraintSet.TOP, 10);
    constraintSet.connect(button.getId(), ConstraintSet.START, mainLayout.getId(), ConstraintSet.START, 50);
    constraintSet.connect(button.getId(), ConstraintSet.END, mainLayout.getId(), ConstraintSet.END, 50);

    constraintSet.constrainWidth(button1.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(button1.getId(), ConstraintSet.TOP, button.getId(), ConstraintSet.BOTTOM, 10);
    constraintSet.connect(button1.getId(), ConstraintSet.START, button.getId(), ConstraintSet.START, 0);
    constraintSet.connect(button1.getId(), ConstraintSet.END, button.getId(), ConstraintSet.END, 700);

    constraintSet.constrainWidth(image.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(image.getId(), ConstraintSet.TOP, button1.getId(), ConstraintSet.BOTTOM, 10);
    constraintSet.connect(image.getId(), ConstraintSet.START, button.getId(), ConstraintSet.START, 100);
    constraintSet.connect(image.getId(), ConstraintSet.END, button.getId(), ConstraintSet.END, 100);

    constraintSet.constrainWidth(button3.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(button3.getId(), ConstraintSet.TOP, button.getId(), ConstraintSet.BOTTOM, 10);
    constraintSet.connect(button3.getId(), ConstraintSet.START, button.getId(), ConstraintSet.START, 700);
    constraintSet.connect(button3.getId(), ConstraintSet.END, button.getId(), ConstraintSet.END, 0);

    constraintSet.constrainWidth(button2.getId(), constraintSet.MATCH_CONSTRAINT);
    constraintSet.connect(button2.getId(), ConstraintSet.TOP, image.getId(), ConstraintSet.BOTTOM, 10);
    constraintSet.connect(button2.getId(), ConstraintSet.START, button.getId(), ConstraintSet.START, 0);
    constraintSet.connect(button2.getId(), ConstraintSet.END, button.getId(), ConstraintSet.END, 0);
    constraintSet.connect(button2.getId(), ConstraintSet.BOTTOM, mainLayout.getId(), ConstraintSet.BOTTOM, 10);

    constraintSet.applyTo(mainLayout);


    setContentView(sv);
}

}

答案

Cheticamp提示检查版本是解决方案。更新到最新的ConstraintLayout版本，目前1.1.0-beta4，一切看起来都不错。似乎是我的旧版本的问题，即1.0.2。

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