Android android:gravity属性介绍及效果图

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本文转载自/article/7842707.html

android:gravity="center" 表示一个view（TextView）里面的文本，按照这个布局来。 比如中心居中， 就用center，

水平居中就用 center_horizontal

垂直居中就用center_vertical

android:gravity的属性官方说明如下：

public static final intAXIS_CLIP

Since: API Level 3

Raw bit controlling whether the right/bottom edge is clipped to its container, based on the gravity direction being applied.
Constant Value: 8 (0x00000008)

public static final intAXIS_PULL_AFTER

Since: API Level 1

Raw bit controlling how the right/bottom edge is placed.
Constant Value: 4 (0x00000004)

public static final intAXIS_PULL_BEFORE

Since: API Level 1

Raw bit controlling how the left/top edge is placed.
Constant Value: 2 (0x00000002)

public static final intAXIS_SPECIFIED

Since: API Level 1

Raw bit indicating the gravity for an axis has been specified.
Constant Value: 1 (0x00000001)

public static final intAXIS_X_SHIFT

Since: API Level 1

Bits defining the horizontal axis.
Constant Value: 0 (0x00000000)

public static final intAXIS_Y_SHIFT

Since: API Level 1

Bits defining the vertical axis.
Constant Value: 4 (0x00000004)

public static final intBOTTOM

Since: API Level 1

Push object to the bottom of its container, not changing its size.
Constant Value: 80 (0x00000050)

public static final intCENTER

Since: API Level 1

Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.
Constant Value: 17 (0x00000011)

public static final intCENTER_HORIZONTAL

Since: API Level 1

Place object in the horizontal center of its container, not changing its size.
Constant Value: 1 (0x00000001)

public static final intCENTER_VERTICAL

Since: API Level 1

Place object in the vertical center of its container, not changing its size.
Constant Value: 16 (0x00000010)

public static final intCLIP_HORIZONTAL

Since: API Level 3

Flag to clip the edges of the object to its container along the horizontal axis.
Constant Value: 8 (0x00000008)

public static final intCLIP_VERTICAL

Since: API Level 3

Flag to clip the edges of the object to its container along the vertical axis.
Constant Value: 128 (0x00000080)

public static final intDISPLAY_CLIP_HORIZONTAL

Since: API Level 3

Special constant to enable clipping to an overall display along the horizontal dimension. This is not applied by default by

apply(int, int, int, Rect, int, int, Rect)

; you must do so yourself by calling

applyDisplay(int,
Rect, Rect)

.
Constant Value: 16777216 (0x01000000)

public static final intDISPLAY_CLIP_VERTICAL

Since: API Level 3

Special constant to enable clipping to an overall display along the vertical dimension. This is not applied by default by

apply(int, int, int, Rect, int, int, Rect)

; you must do so yourself by calling

applyDisplay(int,
Rect, Rect)

.
Constant Value: 268435456 (0x10000000)

public static final intEND

Since: API Level 14

Push object to x-axis position at the end of its container, not changing its size.
Constant Value: 8388613 (0x00800005)

public static final intFILL

Since: API Level 1

Grow the horizontal and vertical size of the object if needed so it completely fills its container.
Constant Value: 119 (0x00000077)

public static final intFILL_HORIZONTAL

Since: API Level 1

Grow the horizontal size of the object if needed so it completely fills its container.
Constant Value: 7 (0x00000007)

public static final intFILL_VERTICAL

Since: API Level 1

Grow the vertical size of the object if needed so it completely fills its container.
Constant Value: 112 (0x00000070)

public static final intHORIZONTAL_GRAVITY_MASK

Since: API Level 1

Binary mask to get the absolute horizontal gravity of a gravity.
Constant Value: 7 (0x00000007)

public static final intLEFT

Since: API Level 1

Push object to the left of its container, not changing its size.
Constant Value: 3 (0x00000003)

public static final intNO_GRAVITY

Since: API Level 1

Constant indicating that no gravity has been set
Constant Value: 0 (0x00000000)

public static final intRELATIVE_HORIZONTAL_GRAVITY_MASK

Since: API Level 14

Binary mask for the horizontal gravity and script specific direction bit.
Constant Value: 8388615 (0x00800007)

public static final intRELATIVE_LAYOUT_DIRECTION

Since: API Level 14

Raw bit controlling whether the layout direction is relative or not (START/END instead of absolute LEFT/RIGHT).
Constant Value: 8388608 (0x00800000)

public static final intRIGHT

Since: API Level 1

Push object to the right of its container, not changing its size.
Constant Value: 5 (0x00000005)

public static final intSTART

Since: API Level 14

Push object to x-axis position at the start of its container, not changing its size.
Constant Value: 8388611 (0x00800003)

public static final intTOP

Since: API Level 1

Push object to the top of its container, not changing its size.
Constant Value: 48 (0x00000030)

public static final intVERTICAL_GRAVITY_MASK

Since: API Level 1

Binary mask to get the vertical gravity of a gravity.
Constant Value: 112 (0x00000070)

效果图1：



布局文件xml内容如下：

[html]
view plaincopyprint?

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

<TextView android:id="@+id/TextView01"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="top"
android:gravity="top"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView02"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="bottom"
android:gravity="bottom"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView03"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="left"
android:gravity="left"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView04"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="right"
android:gravity="right"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView05"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="center_vertical"
android:gravity="center_vertical"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView06"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="fill_vertical"
android:gravity="fill_vertical"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView07"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="center_horizontal"
android:gravity="center_horizontal"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView08"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="fill_horizontal"
android:gravity="fill_horizontal"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView09"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="center"
android:gravity="center"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView10"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="fill"
android:gravity="fill"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView11"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="clip_vertical"
android:gravity="clip_vertical"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView12"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="clip_horizontal"
android:gravity="clip_horizontal"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

</LinearLayout>

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

<TextView android:id="@+id/TextView01"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="top"
android:gravity="top"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView02"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="bottom"
android:gravity="bottom"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView03"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="left"
android:gravity="left"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView04"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="right"
android:gravity="right"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView05"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="center_vertical"
android:gravity="center_vertical"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView06"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="fill_vertical"
android:gravity="fill_vertical"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView07"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="center_horizontal"
android:gravity="center_horizontal"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView08"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="fill_horizontal"
android:gravity="fill_horizontal"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView09"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="center"
android:gravity="center"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView10"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="fill"
android:gravity="fill"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView11"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="clip_vertical"
android:gravity="clip_vertical"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

<TextView android:id="@+id/TextView12"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:text="clip_horizontal"
android:gravity="clip_horizontal"
android:textColor="#ffffff"
android:background="#ff0000"
android:layout_margin="1px"/>

</LinearLayout>

效果图2：



xml布局文件如下：

[html]
view plaincopyprint?

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

<TextView android:id="@+id/TextView01"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="top"
android:gravity="top"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView02"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="bottom"
android:gravity="bottom"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView03"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="left"
android:gravity="left"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView04"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="right"
android:gravity="right"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView05"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="center_vertical"
android:gravity="center_vertical"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView06"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="fill_vertical"
android:gravity="fill_vertical"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView07"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="center_horizontal"
android:gravity="center_horizontal"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView08"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="fill_horizontal"
android:gravity="fill_horizontal"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView09"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="center"
android:gravity="center"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView10"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="fill"
android:gravity="fill"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView11"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="clip_vertical"
android:gravity="clip_vertical"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView12"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="clip_horizontal"
android:gravity="clip_horizontal"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

</LinearLayout>

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

<TextView android:id="@+id/TextView01"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="top"
android:gravity="top"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView02"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="bottom"
android:gravity="bottom"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView03"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="left"
android:gravity="left"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView04"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="right"
android:gravity="right"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView05"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="center_vertical"
android:gravity="center_vertical"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView06"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="fill_vertical"
android:gravity="fill_vertical"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView07"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="center_horizontal"
android:gravity="center_horizontal"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView08"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="fill_horizontal"
android:gravity="fill_horizontal"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView09"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="center"
android:gravity="center"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView10"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="fill"
android:gravity="fill"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView11"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="clip_vertical"
android:gravity="clip_vertical"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

<TextView android:id="@+id/TextView12"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="clip_horizontal"
android:gravity="clip_horizontal"
android:textColor="#ffffff"
android:background="#00ff00"
android:layout_margin="2px"/>

</LinearLayout>