[英]How to place a button at an specific coordinate in an imageview
您在约束布局的帮助下获得了视图,我做了同样的事情,只是检查此代码。
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight=".5">
<me.tankery.lib.circularseekbar.CircularSeekBar
android:id="@+id/circularSeekBar"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:cs_circle_color="#0000ff"
app:cs_circle_progress_color="#ff0000"
app:cs_circle_stroke_width="4dp"
app:cs_pointer_color="#ff0000"
app:cs_pointer_stroke_width="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageButton
android:id="@+id/play"
android:layout_width="52dp"
android:layout_height="52dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#0000"
android:src="@drawable/play"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
它为我提供了类似搜寻栏中间的按钮的视图
注意:请使用拖放功能,它提供了完美的实现
您可以尝试ConstraintLayout并使用图像高度的百分比或以下方式添加辅助线:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imageView2"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="@tools:sample/avatars" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.50121653" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.6" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:text="Button"
app:layout_constraintBottom_toTopOf="@+id/guideline2"
app:layout_constraintEnd_toStartOf="@+id/guideline"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toTopOf="@+id/guideline2" />
</androidx.constraintlayout.widget.ConstraintLayout>
在按钮上使用setX和setY将其放置在所需位置
button.setX(dotX);
button.setY(dotY);
但是要使按钮在圆点上居中
button.setX(dotX - buttonWidth/2);
button.setY(dotY - buttonHeight/2);
您应该改用RelativeLayout
例:
假设您希望位置(70x80)时在屏幕上显示大小为50x60的ImageView
// RelativeLayout。 尽管您也可以通过findViewById()
在此处使用xml RelativeLayout
RelativeLayout relativeLayout = new RelativeLayout(this);
// ImageView
ImageView imageView = new ImageView(this);
// Setting layout params to our RelativeLayout
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(50, 60);
// Setting position of our ImageView
layoutParams.leftMargin = 70;
layoutParams.topMargin = 80;
// Finally Adding the imageView to RelativeLayout and its position
relativeLayout.addView(imageView, layoutParams);
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