{"id":1572,"date":"2013-01-03T19:58:08","date_gmt":"2013-01-03T17:58:08","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=1572"},"modified":"2013-01-30T19:20:03","modified_gmt":"2013-01-30T17:20:03","slug":"android-alert-dialog-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/android\/core\/ui\/alertdialog\/android-alert-dialog-example\/","title":{"rendered":"Android Alert Dialog Example"},"content":{"rendered":"

The Alert Dialog is a very common component in all User Interfaces, when you want to inform the User about a serious\u00a0decisions\u00a0concerning\u00a0some aspects or the flow of the Application. In this tutorial, we will learn how to display a simple Alert Dialog, where the User will decide\u00a0whether\u00a0to to close the Application or not.
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\n <\/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. Adding resources<\/h3>\n

    Use the Package Explorer in Eclipse to navigate to\u00a0res\/values\/strings.xml<\/code><\/p>\n

    \"\"<\/a>

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

    When you open the\u00a0strings.xml<\/code>\u00a0file, Eclipse will display the graphical Resources View editor :<\/p>\n

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

    That\u2019s a nice and easy tool you can use to add several resources to your application\u00a0like strings, integers, color values etc. But we are going to use the traditional way and that is editing the\u00a0strings.xml\u00a0<\/code>file by hand. In the bottom of the screen, press the\u00a0string.xml\u00a0<\/code>tab and paste the following code :<\/p>\n

    <?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<resources>\r\n\r\n    <string name=\"app_name\">AlertDialogExample<\/string>\r\n    <string name=\"menu_settings\">Settings<\/string>\r\n    <string name=\"button_label\">Show Alert Dialog<\/string>\r\n\r\n<\/resources><\/pre>\n
    So, we\u2019ve just created some string resources that we can use in many ways and in many places in our app.<\/p>\n
    3. Creating a Button<\/h3>\n
    Open\u00a0res\/layout\/main.xml<\/code>\u00a0file :<\/p>\n
    \"\"<\/a><\/p>\n
    And paste the following code :<\/p>\n
    <?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<LinearLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    android:layout_width=\"fill_parent\"\r\n    android:layout_height=\"fill_parent\"\r\n    android:orientation=\"vertical\" >\r\n\r\n    <Button\r\n        android:id=\"@+id\/button\"\r\n        android:layout_width=\"wrap_content\"\r\n        android:layout_height=\"wrap_content\"\r\n        android:text=\"@string\/button_label\" \/>\r\n\r\n<\/LinearLayout><\/pre>\n
    Now you may open the Graphical layout editor to preview the User Interface you created:<\/p>\n
    \"\"<\/a><\/p>\n
    4. Code<\/h3>\n
    The code of this tutorial is pretty much self\u00a0explanatory. Go to the java file that contains the code of the activity\u00a0you’ve\u00a0just created and paste the following code:<\/p>\n
    package com.javacodegeeks.android.alertdialogexample;\r\n\r\nimport android.app.Activity;\r\nimport android.app.AlertDialog;\r\nimport android.content.Context;\r\nimport android.content.DialogInterface;\r\nimport android.os.Bundle;\r\nimport android.view.View;\r\nimport android.view.View.OnClickListener;\r\nimport android.widget.Button;\r\n\r\npublic class MainActivity extends Activity {\r\n\r\n\tfinal Context context = this;\r\n\tprivate Button button;\r\n\r\n\tpublic void onCreate(Bundle savedInstanceState) {\r\n\r\n\t\tsuper.onCreate(savedInstanceState);\r\n\t\tsetContentView(R.layout.main);\r\n\r\n\t\tbutton = (Button) findViewById(R.id.button);\r\n\r\n\t\t\/\/ add button listener\r\n\t\tbutton.setOnClickListener(new OnClickListener() {\r\n\r\n\t\t\t@Override\r\n\t\t\tpublic void onClick(View arg0) {\r\n\r\n\t\t\t\tAlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(\r\n\t\t\t\t\t\tcontext);\r\n\r\n\t\t\t\t\/\/ set the title of the Alert Dialog\r\n\t\t\t\talertDialogBuilder.setTitle(\"Exit Application?\");\r\n\r\n\t\t\t\t\/\/ set dialog message\r\n\t\t\t\talertDialogBuilder\r\n\t\t\t\t\t\t.setMessage(\"Click yes to exit!\")\r\n\t\t\t\t\t\t.setCancelable(false)\r\n\t\t\t\t\t\t.setPositiveButton(\"Yes\",\r\n\t\t\t\t\t\t\t\tnew DialogInterface.OnClickListener() {\r\n\t\t\t\t\t\t\t\t\tpublic void onClick(DialogInterface dialog,\r\n\t\t\t\t\t\t\t\t\t\t\tint id) {\r\n\t\t\t\t\t\t\t\t\t\t\/\/ if yes is clicked, close\r\n\t\t\t\t\t\t\t\t\t\t\/\/ current activity\r\n\t\t\t\t\t\t\t\t\t\tMainActivity.this.finish();\r\n\t\t\t\t\t\t\t\t\t}\r\n\t\t\t\t\t\t\t\t})\r\n\t\t\t\t\t\t.setNegativeButton(\"No\",\r\n\t\t\t\t\t\t\t\tnew DialogInterface.OnClickListener() {\r\n\t\t\t\t\t\t\t\t\tpublic void onClick(DialogInterface dialog,\r\n\t\t\t\t\t\t\t\t\t\t\tint id) {\r\n\t\t\t\t\t\t\t\t\t\t\/\/ if no is clicked, just close\r\n\t\t\t\t\t\t\t\t\t\t\/\/ the dialog box and do nothing\r\n\t\t\t\t\t\t\t\t\t\tdialog.cancel();\r\n\t\t\t\t\t\t\t\t\t}\r\n\t\t\t\t\t\t\t\t});\r\n\r\n\t\t\t\tAlertDialog alertDialog = alertDialogBuilder.create();\r\n\r\n\t\t\t\talertDialog.show();\r\n\t\t\t}\r\n\t\t});\r\n\t}\r\n}<\/pre>\n
    5. Run the application<\/h3>\n
    This is the main screen of our Application:<\/p>\n
    \"\"<\/a><\/p>\n
    Now, when you press the button :<\/p>\n
    \"\"<\/a><\/p>\n
    If you press “No”, you will go back to the application. In this case, you will go back to the main screen of the Application. But if you press “Yes” you will exit the Application and go to the main screen of the emulator:<\/p>\n
    \"\"<\/a><\/p>\n
    Now if you want to launch the Application again press the Applications Button :<\/p>\n
    \"\"<\/a><\/p>\n
    And press the Application Icon:<\/p>\n
    \"\"<\/a><\/p>\n
    Download Eclipse Project<\/h3>\n
    This was an Android Alert Dialog Example. Download the Eclipse Project of this tutorial:\u00a0AndroidAlertDialogExample.zip<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
    The Alert Dialog is a very common component in all User Interfaces, when you want to inform the User about a serious\u00a0decisions\u00a0concerning\u00a0some aspects or the flow of the Application. In this tutorial, we will learn how to display a simple Alert Dialog, where the User will decide\u00a0whether\u00a0to to close the Application or not.     …<\/p>\n","protected":false},"author":7,"featured_media":1202,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[318],"tags":[280,265,267],"class_list":["post-1572","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alertdialog","tag-android-alert-dialog","tag-android-core","tag-android-ui"],"yoast_head":"\nAndroid Alert Dialog Example<\/title>\n<meta name=\"description\" content=\"The Alert Dialog is a very common component in all User Interfaces, when you want to inform the User about a serious\u00a0decisions\u00a0concerning\u00a0some aspects or\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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