android 虚拟设备中的布局与布局预览和真实设备中的布局不同
android layout in virtual device is not the same as in layout preview and real device
环境:
Android Studio 3.4.1
activity_main.xml代码
<?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="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:ems="10"
android:hint="@string/edit_message"
android:inputType="textPersonName"
app:layout_constraintEnd_toStartOf="@+id/button"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:onClick="sendMessage"
android:text="@string/button_send"
app:layout_constraintBaseline_toBaselineOf="@+id/editText"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/editText" />
</androidx.constraintlayout.widget.ConstraintLayout>
在android工作室布局设计选项卡中,显示如下。
my real phone device profile :
resolution: 1440x720 px
screen size: 5.45 inch
android version: 8.1.0
在真机上正常显示
While in android studio virtual device EditText's hint message is not completely displayed.
virtual device profile:
resoluton: 480x800
density: hdpi
API: 26
Target:Android 8.0(Google APIs)
Size: 4.0 inch
您可以尝试使用 LinearLayout 而不是 ConstraintLayout。它将轻松解决您的问题。
代码
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.75"
android:hint="Enter a message"/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.25"
android:text="Button"/>
环境:
Android Studio 3.4.1
activity_main.xml代码
<?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="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:ems="10"
android:hint="@string/edit_message"
android:inputType="textPersonName"
app:layout_constraintEnd_toStartOf="@+id/button"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:onClick="sendMessage"
android:text="@string/button_send"
app:layout_constraintBaseline_toBaselineOf="@+id/editText"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/editText" />
</androidx.constraintlayout.widget.ConstraintLayout>
在android工作室布局设计选项卡中,显示如下。
my real phone device profile :
resolution: 1440x720 px
screen size: 5.45 inch
android version: 8.1.0
在真机上正常显示
While in android studio virtual device EditText's hint message is not completely displayed.
virtual device profile:
resoluton: 480x800
density: hdpi
API: 26
Target:Android 8.0(Google APIs)
Size: 4.0 inch
您可以尝试使用 LinearLayout 而不是 ConstraintLayout。它将轻松解决您的问题。
代码
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.75"
android:hint="Enter a message"/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.25"
android:text="Button"/>