1 page.title=<activity-alias> 2 parent.title=The AndroidManifest.xml File 3 parent.link=manifest-intro.html 4 @jd:body 5 6 <dl class="xml"> 7 <dt>syntax:</dt> 8 <dd><pre class="stx"><activity-alias android:<a href="#enabled">enabled</a>=["true" | "false"] 9 android:<a href="#exported">exported</a>=["true" | "false"] 10 android:<a href="#icon">icon</a>="<i>drawable resource</i>" 11 android:<a href="#label">label</a>="<i>string resource</i>" 12 android:<a href="#nm">name</a>="<i>string</i>" 13 android:<a href="#prmsn">permission</a>="<i>string</i>" 14 android:<a href="#trgt">targetActivity</a>="<i>string</i>" > 15 . . . 16 </activity-alias></pre></dd> 17 18 <dt>contained in:</dt> 19 <dd><code><a href="{@docRoot}guide/topics/manifest/application-element.html"><application></a></code></dd> 20 21 <dt>can contain:</dt> 22 <dd><code><a href="{@docRoot}guide/topics/manifest/intent-filter-element.html"><intent-filter></a></code> 23 <br/><code><a href="{@docRoot}guide/topics/manifest/meta-data-element.html"><meta-data></a></code></dd> 24 25 <dt>description:</dt> 26 <dd>An alias for an activity, named by the {@code targetActivity} 27 attribute. The target must be in the same application as the 28 alias and it must be declared before the alias in the manifest. 29 30 <p> 31 The alias presents the target activity as a independent entity. 32 It can have its own set of intent filters, and they, rather than the 33 intent filters on the target activity itself, determine which intents 34 can activate the target through the alias and how the system 35 treats the alias. For example, the intent filters on the alias may 36 specify the "<code>{@link android.content.Intent#ACTION_MAIN 37 android.intent.action.MAIN}</code>" 38 and "<code>{@link android.content.Intent#CATEGORY_LAUNCHER 39 android.intent.category.LAUNCHER}</code>" flags, causing it to be 40 represented in the application launcher, even though none of the 41 filters on the target activity itself set these flags. 42 </p> 43 44 <p> 45 With the exception of {@code targetActivity}, {@code <activity-alias>} 46 attributes are a subset of <code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code> attributes. 47 For attributes in the subset, none of the values set for the target carry over 48 to the alias. However, for attributes not in the subset, the values set for 49 the target activity also apply to the alias. 50 </p></dd> 51 52 <dt>attributes:</dt> 53 <dd><dl class="attr"> 54 <dt><a name="enabled"></a>{@code android:enabled}</dt> 55 <dd>Whether or not the target activity can be instantiated by the system through 56 this alias — "{@code true}" if it can be, and "{@code false}" if not. 57 The default value is "{@code true}". 58 59 <p> 60 The <code><a href="{@docRoot}guide/topics/manifest/application-element.html"><application></a></code> element has its own 61 <code><a href="{@docRoot}guide/topics/manifest/application-element.html#enabled">enabled</a></code> attribute that applies to all 62 application components, including activity aliases. The 63 <code><a href="{@docRoot}guide/topics/manifest/application-element.html"><application></a></code> and {@code <activity-alias>} 64 attributes must both be "{@code true}" for the system to be able to instantiate 65 the target activity through the alias. If either is "{@code false}", the alias 66 does not work. 67 </p></dd> 68 69 <dt><a name="exported"></a>{@code android:exported}</dt> 70 <dd>Whether or not components of other applications can launch the target activity 71 through this alias — "{@code true}" if they can, and "{@code false}" if not. 72 If "{@code false}", the target activity can be launched through the alias only by 73 components of the same application as the alias or applications with the same user ID. 74 75 <p> 76 The default value depends on whether the alias contains intent filters. The 77 absence of any filters means that the activity can be invoked through the alias 78 only by specifying the exact name of the alias. This implies that the alias 79 is intended only for application-internal use (since others would not know its name) 80 — so the default value is "{@code false}". 81 On the other hand, the presence of at least one filter implies that the alias 82 is intended for external use — so the default value is "{@code true}". 83 </p></dd> 84 85 <dt><a name="icon"></a>{@code android:icon}</dt> 86 <dd>An icon for the target activity when presented to users through the alias. 87 See the <code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code> element's 88 <code><a href="{@docRoot}guide/topics/manifest/activity-element.html#icon">icon</a></code> attribute for more information. 89 90 <dt><a name="label"></a>{@code android:label}</dt> 91 <dd>A user-readable label for the alias when presented to users through the alias. 92 See the <code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code> element's 93 <code><a href="{@docRoot}guide/topics/manifest/activity-element.html#label">label</a></code> attribute for more information. 94 </p></dd> 95 96 <dt><a name="nm">{@code android:name}</dt> 97 <dd>A unique name for the alias. The name should resemble a fully 98 qualified class name. But, unlike the name of the target activity, 99 the alias name is arbitrary; it does not refer to an actual class. 100 </p></dd> 101 102 <dt><a name="prmsn"></a>{@code android:permission}</dt> 103 <dd>The name of a permission that clients must have to launch the target activity 104 or get it to do something via the alias. If a caller of 105 <code>{@link android.content.Context#startActivity startActivity()}</code> or 106 <code>{@link android.app.Activity#startActivityForResult startActivityForResult()}</code> 107 has not been granted the specified permission, the target activity will not be 108 activated. 109 110 <p>This attribute supplants any permission set for the target activity itself. If 111 it is not set, a permission is not needed to activate the target through the alias. 112 </p> 113 114 <p> 115 For more information on permissions, see the 116 <a href="{@docRoot}guide/topics/manifest/manifest-intro.html#perms">Permissions</a> 117 section in the introduction. 118 </p></dd> 119 120 <dt><a name="trgt"></a>{@code android:targetActivity}</dt> 121 <dd>The name of the activity that can be activated through the alias. 122 This name must match the {@code name} attribute of an 123 <code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code> element that precedes 124 the alias in the manifest. 125 </p></dd> 126 </dl></dd> 127 128 <!-- ##api level indication## --> 129 <dt>introduced in:</dt> 130 <dd>API Level 1</dd> 131 132 <dt>see also:</dt> 133 <dd><code><a href="{@docRoot}guide/topics/manifest/activity-element.html"><activity></a></code></dd> 134 135 </dl> 136
