{"id":2112,"date":"2013-02-09T15:00:05","date_gmt":"2013-02-09T13:00:05","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=2112"},"modified":"2013-02-09T16:50:27","modified_gmt":"2013-02-09T14:50:27","slug":"android-how-to-set-default-activity","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/android\/core\/android-how-to-set-default-activity\/","title":{"rendered":"Android: How to set default activity"},"content":{"rendered":"

In Android you might create many\u00a0Activities\u00a0for your Application and you want to choose which one of these will be launched when the Application starts up. In other words which Activity will have the role of the main Activity<\/a> <\/code>of your Application. You can do that by creating an Intent<\/a> <\/code>filter in the AndroidManifest.xml<\/code> file of your Project. The AndroidManifest.xml<\/code> file is the Application description file that contains the declaration and the properties of the Activities, among many other Application features.<\/p>\n

In this tutorial we will create two Activities for our App: MainActivity <\/code>and SecondActivity<\/code>. We will then change the role of the main Activity using an Intent <\/code>Filter.<\/p>\n

For this tutorial, we will use the following tools in a Windows 64-bit platform:<\/p>\n

    \n
  1. JDK 1.7<\/li>\n
  2. Eclipse 4.2 Juno<\/li>\n
  3. Android SKD 4.2<\/li>\n<\/ol>\n

    1. Create a new Android Project<\/h3>\n

    Open Eclipse IDE and go to File -> New -> Project -> Android -> Android Application Project.\u00a0You have to specify the Application Name, the Project Name and the Package name in the appropriate text fields and then click Next.<\/p>\n

    \"\"<\/a><\/p>\n

    In the next window make sure the \u201cCreate activity\u201d option is selected in order to create a new activity for your project, and click Next. This is optional as you can create a new activity after creating the project, but you can do it all in one step.<\/p>\n

    \"\"<\/a><\/p>\n

    Select \u201cBlankActivity\u201d and click Next.<\/p>\n

    \"\"<\/a><\/p>\n

    You will be asked to specify some information about the new activity. \u00a0In the Layout Name text field you have to specify the name of the file that will contain the layout description of your app. In our case the file\u00a0res\/layout\/main.xml<\/code>\u00a0will be created. Then, click Finish.<\/p>\n

    \"\"<\/a><\/p>\n

    2. Create a second Activity for our Application<\/h3>\n

    To create a new Activity, go to the package explorer and find the package of the source files:<\/p>\n

    \"\"<\/a>

    <\/div> <\/div><\/p>\n

    As you can see there is only one source file at the moment that contains the code of the main activity of our App. Now to create a second activity Right Click on the package and select : New -> Other -> Android -> Android Activity:<\/p>\n

    \"\"<\/a><\/p>\n

    Then you have to specify the name of the Activity and the name of \u00a0its\u00a0corresponding\u00a0Layout XML File :<\/p>\n

    \"\"<\/a><\/p>\n

    Now as you can see in the package explorer the new Activity source file has been created:<\/p>\n

    \"\"<\/a><\/p>\n

    Now open\u00a0res\/layout\/main.xml<\/code>\u00a0file :<\/p>\n

    \"\"<\/a><\/p>\n

    And paste the following code :<\/p>\n

    <RelativeLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    xmlns:tools=\"http:\/\/schemas.android.com\/tools\"\r\n    android:layout_width=\"match_parent\"\r\n    android:layout_height=\"match_parent\"\r\n    tools:context=\".MainActivity\" >\r\n\r\n    <TextView\r\n        android:layout_width=\"wrap_content\"\r\n        android:layout_height=\"wrap_content\"\r\n        android:layout_centerHorizontal=\"true\"\r\n        android:layout_centerVertical=\"true\"\r\n        android:text=\"Main Activity\" \/>\r\n\r\n<\/RelativeLayout><\/pre>\n
    Open\u00a0res\/layout\/second.xml<\/code>\u00a0file :<\/p>\n
    \"\"<\/a><\/p>\n
    And paste the following code:<\/p>\n
    <RelativeLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    xmlns:tools=\"http:\/\/schemas.android.com\/tools\"\r\n    android:layout_width=\"match_parent\"\r\n    android:layout_height=\"match_parent\"\r\n    tools:context=\".SecondActivity\" >\r\n\r\n    <TextView\r\n        android:layout_width=\"wrap_content\"\r\n        android:layout_height=\"wrap_content\"\r\n        android:layout_centerHorizontal=\"true\"\r\n        android:layout_centerVertical=\"true\"\r\n        android:text=\"Second Activity\" \/>\r\n\r\n<\/RelativeLayout><\/pre>\n
    3. Run the application<\/h3>\n
    This is the default main screen of our Application:<\/p>\n
    \"\"<\/a><\/p>\n
    As you can see\u00a0MainActivity <\/code>is set up as the main Activity by default.<\/p>\n
    Now let’s open to the AndroidManifest.xml<\/code> file :<\/p>\n
    \"\"<\/a><\/p>\n
    And let’s see the code that has been automatically created:<\/p>\n
    <?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<manifest xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    package=\"com.javacodegeeks.android.setdefaultactivityexample\"\r\n    android:versionCode=\"1\"\r\n    android:versionName=\"1.0\" >\r\n\r\n    <uses-sdk\r\n        android:minSdkVersion=\"8\"\r\n        android:targetSdkVersion=\"16\" \/>\r\n\r\n    <application\r\n        android:allowBackup=\"true\"\r\n        android:icon=\"@drawable\/ic_launcher\"\r\n        android:label=\"@string\/app_name\"\r\n        android:theme=\"@style\/AppTheme\" >\r\n        <activity\r\n            android:name=\"com.javacodegeeks.android.setdefaultactivityexample.MainActivity\"\r\n            android:label=\"@string\/app_name\" >\r\n            <intent-filter>\r\n                <action android:name=\"android.intent.action.MAIN\" \/>\r\n\r\n                <category android:name=\"android.intent.category.LAUNCHER\" \/>\r\n            <\/intent-filter>\r\n        <\/activity>\r\n        <activity\r\n            android:name=\"com.javacodegeeks.android.setdefaultactivityexample.SecondActivity\"\r\n            android:label=\"@string\/title_activity_second\" >\r\n        <\/activity>\r\n    <\/application>\r\n\r\n<\/manifest><\/pre>\n
    As you can see inside the\u00a0deceleration\u00a0of the MainActivity <\/code>there is the Intent filter we talked about in the introduction:<\/p>\n
    <intent-filter>\r\n                <action android:name=\"android.intent.action.MAIN\" \/>\r\n\r\n                <category android:name=\"android.intent.category.LAUNCHER\" \/>\r\n<\/intent-filter><\/pre>\n
    Go ahead and remove that filter from the MainActivity <\/code>and paste it in the declaration of the SecondActivity <\/code>so that the new AndroidManifest.xml<\/code> file looks like this:<\/p>\n
    <?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<manifest xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    package=\"com.javacodegeeks.android.setdefaultactivityexample\"\r\n    android:versionCode=\"1\"\r\n    android:versionName=\"1.0\" >\r\n\r\n    <uses-sdk\r\n        android:minSdkVersion=\"8\"\r\n        android:targetSdkVersion=\"16\" \/>\r\n\r\n    <application\r\n        android:allowBackup=\"true\"\r\n        android:icon=\"@drawable\/ic_launcher\"\r\n        android:label=\"@string\/app_name\"\r\n        android:theme=\"@style\/AppTheme\" >\r\n        <activity\r\n            android:name=\"com.javacodegeeks.android.setdefaultactivityexample.MainActivity\"\r\n            android:label=\"@string\/app_name\" >\r\n\r\n        <\/activity>\r\n        <activity\r\n            android:name=\"com.javacodegeeks.android.setdefaultactivityexample.SecondActivity\"\r\n            android:label=\"@string\/title_activity_second\" >\r\n             <intent-filter>\r\n                <action android:name=\"android.intent.action.MAIN\" \/>\r\n\r\n                <category android:name=\"android.intent.category.LAUNCHER\" \/>\r\n            <\/intent-filter>\r\n        <\/activity>\r\n    <\/application>\r\n\r\n<\/manifest><\/pre>\n
    Now run the Application again :<\/p>\n
    \"\"<\/a><\/p>\n
    As you can see SecondActivity <\/code>has now the role of the main Activity of our Application.<\/p>\n
    Download Eclipse Project<\/h3>\n
    This was an Android tutorial on how to set the main Activity of your Application. Download the Eclipse Project of this tutorial:\u00a0SetDefaultActivityExample.zip<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
    In Android you might create many\u00a0Activities\u00a0for your Application and you want to choose which one of these will be launched when the Application starts up. In other words which Activity will have the role of the main Activity of your Application. You can do that by creating an Intent filter in the AndroidManifest.xml file of …<\/p>\n","protected":false},"author":7,"featured_media":1202,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[341,340],"class_list":["post-2112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-core","tag-intent-filter","tag-main-activity"],"yoast_head":"\nAndroid: How to set default activity<\/title>\n<meta name=\"description\" content=\"In Android you might create many\u00a0Activities\u00a0for your Application and you want to choose which one of these will be launched when the Application starts\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/examples.javacodegeeks.com\/android\/core\/android-how-to-set-default-activity\/\" \/>\n<meta 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