将视图添加到约束布局，约束类似于另一个孩子 [英] Add view to constraintLayout with constraints similar to another child

问题描述

I have a constraint layout (alpha9) with views spread all over it, and I have one particular ImageView that I need to replicate and add more of like it. The layout is like so :

The main purpose is to animate 5 of those "coin" imageViews when the button is pressed. The imageViews i need to generated sha'll have exact properties of the the imageView behind the Button down below (with same constraints)

What i tried to do is the following :

private ImageView generateCoin() {
    ImageView coin = new ImageView(this);
    constraintLayout.addView(coin,-1,originCoinImage.getLayoutParams());//originCoinImage is the imageView behind the button
    coin.setImageResource(R.drawable.ic_coin);
    coin.setScaleType(ImageView.ScaleType.FIT_XY);
    coin.setVisibility(View.VISIBLE);
    return coin;
}

And it failed. EDIT: It failed to show what i wanted , sometimes it shows a coin in the top left of the screen , sometimes it doesn't show anything but either way , the number of coins increments (meaning the animation is trying to actually do something and then calling the onAnimationFinished method)

I used for animation the library EasyAndroidAnimations

the code is as follows :

MainActivity.java

@OnClick(R.id.addCoin)
public void addCoin() {
//        for (int x = 0 ; x < 5 ; x++){
    final View newCoin = generateCoin();

    sendCoin(newCoin, 300, new AnimationListener() {
        @Override
        public void onAnimationEnd(com.easyandroidanimations.library.Animation animation) {
            incrementCoins();
            constraintLayout.removeView(newCoin);
            shakeCoin(targetCoinImage, 200, null);
        }
    });
//        }
}

private void incrementCoins() {
    coins++;
    coinNumber.setText(String.valueOf(coins));
}

private void sendCoin(View coinView, long duration, AnimationListener listener) {
    new TransferAnimation(coinView)
            .setDestinationView(targetCoinImage)
            .setDuration(duration)
            .setInterpolator(new AccelerateDecelerateInterpolator())
            .setListener(listener)
            .animate();
}

private void shakeCoin(View coinView, long duration, AnimationListener listener) {
    new ShakeAnimation(coinView)
            .setDuration(duration)
            .setShakeDistance(6f)
            .setNumOfShakes(5)
            .setListener(listener)
            .animate();
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="seaskyways.canvasanddrawtest.MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:text="Coins : "
        android:textSize="30sp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/coinNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="8dp"
        android:text="0"
        android:textColor="@color/colorPrimary"
        android:textSize="50sp"
        android:textStyle="normal|bold"
        app:layout_constraintBottom_toBottomOf="@+id/textView"
        app:layout_constraintLeft_toRightOf="@+id/textView"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/textView" />

    <ImageView
        android:id="@+id/coinOrigin"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:scaleType="fitXY"
        app:layout_constraintBottom_toBottomOf="@+id/addCoin"
        app:layout_constraintLeft_toLeftOf="@+id/addCoin"
        app:layout_constraintTop_toTopOf="@+id/addCoin"
        app:srcCompat="@drawable/ic_coin"
        app:layout_constraintRight_toRightOf="@+id/addCoin" />

    <ImageView
        android:id="@+id/coinTarget"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginLeft="16dp"
        android:layout_marginStart="16dp"
        android:scaleType="fitXY"
        app:layout_constraintBottom_toBottomOf="@+id/coinNumber"
        app:layout_constraintLeft_toRightOf="@+id/coinNumber"
        app:layout_constraintTop_toTopOf="@+id/coinNumber"
        app:srcCompat="@drawable/ic_coin" />

    <Button
        android:id="@+id/addCoin"
        android:layout_width="0dp"
        android:layout_height="75dp"
        android:layout_marginBottom="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="16dp"
        android:text="Button"
        android:textAlignment="center"
        android:textSize="36sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />
</android.support.constraint.ConstraintLayout>

解决方案

ConstraintLayout.LayoutParams cache its parameters, and is associated to the widget you use it on, so you cannot simply pass one widget's layoutParams to another.

You have to instead generate a new layoutParams for your new object, and copy the corresponding fields.

For example, if you have something like:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
    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/content_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:text="Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginStart="16dp"
        app:layout_constraintLeft_toLeftOf="parent"
        android:layout_marginLeft="16dp" />

</android.support.constraint.ConstraintLayout>

Then you could do:

ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.content_main);
ConstraintLayout.LayoutParams params = 
                (ConstraintLayout.LayoutParams) button.getLayoutParams();

Button anotherButton = new Button(this);

ConstraintLayout.LayoutParams newParams = new ConstraintLayout.LayoutParams(
                ConstraintLayout.LayoutParams.WRAP_CONTENT,
                ConstraintLayout.LayoutParams.WRAP_CONTENT);

newParams.leftToLeft = params.leftToLeft;
newParams.topToTop = params.topToTop;
newParams.leftMargin = params.leftMargin;
newParams.topMargin = params.topMargin;

layout.addView(anotherButton, -1, newParams);

This would put the second button exactly in the same place as the one defined in XML.

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