Android Gravity左裁剪与右裁剪差异

时间:2019-02-17 02:05:38

标签: android layout

我看到了我不理解的左对齐和右对齐TextView在裁剪上的差异。

这是示例布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_height="match_parent"
    android:layout_width="match_parent">

    <RelativeLayout
        android:id="@+id/fullLay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="left">

        <RelativeLayout
            android:id="@+id/layout_message_content_container"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="15dp"
            android:background="@color/blue">

            <TextView android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                android:text="Hello World"/>
        </RelativeLayout>

        <TextView
            android:id="@+id/timestamp_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/layout_message_content_container"
            android:maxLines="1"
            android:layout_alignLeft="@+id/layout_message_content_container"
            android:text="This is a long sample label string"/>
    </RelativeLayout>

</LinearLayout>

这给了我期望的布局:

Left Alignment OK

标题标签位于“ Hello World”下方。但是,如果我将其更改为android:gravity =“ right”并使用layout_alignRight而不是layout_alignLeft,则字幕视图会被裁剪。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_height="match_parent"
    android:layout_width="match_parent">

    <RelativeLayout
        android:id="@+id/fullLay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="right">

        <RelativeLayout
            android:id="@+id/layout_message_content_container"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="15dp"
            android:background="@color/blue">

            <TextView android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                android:text="Hello World"/>
        </RelativeLayout>

        <TextView
            android:id="@+id/timestamp_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/layout_message_content_container"
            android:maxLines="1"
            android:layout_alignRight="@+id/layout_message_content_container"
            android:text="This is a long sample label string"/>
    </RelativeLayout>

</LinearLayout>

现在,字幕视图被裁剪为其上方视图的宽度。

Right-Aligned with Clipping

我如何使该视图与它上方的视图右对齐但未被裁剪?

1 个答案:

答案 0 :(得分:1)

尝试一下-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RelativeLayout
        android:id="@+id/layout_message_content_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end"
        android:background="@color/blue"
        android:padding="15dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World" />
    </RelativeLayout>

    <TextView
        android:id="@+id/timestamp_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end"
        android:maxLines="1"
        android:text="This is a long sample label string" />

</LinearLayout>

ConstraintLayout相同的用户界面

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/blue"
        android:padding="15dp"
        android:text="Hello World"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/timestamp_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxLines="1"
        android:text="This is a long sample label string"
        android:textAlignment="textEnd"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@id/hello_world" />

</android.support.constraint.ConstraintLayout>