{"id":17827,"date":"2015-01-02T11:19:14","date_gmt":"2015-01-02T09:19:14","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=17827"},"modified":"2023-11-09T15:06:46","modified_gmt":"2023-11-09T13:06:46","slug":"android-dropbox-implementation-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/android\/android-dropbox-implementation-example\/","title":{"rendered":"Android Dropbox Implementation Example"},"content":{"rendered":"

1. Creating a Dropbox Application<\/h2>\n

Visit https:\/\/www.dropbox.com\/developers\/apps<\/a> and after signing-in with an existing account, click on the “Create app” button, on the top right corner.<\/p>\n

Configure the app like below and click on “Create App”:<\/p>\n

\"Figure<\/a>
Figure 1. Dropbox app configuration<\/figcaption><\/figure><\/p>\n

[ulp id=’XSQzgZ7lDbTb31Tj’]<\/span><\/p>\n

Once the app is created, you will be redirected to its dashboard, where you can find all the useful parameters. In order to access a dropbox account from an android app, what is needed, is the App key<\/b> and App secret<\/b> of a dropbox app (like the one that we just created) ; both of them are auto-generated from the dropbox service, while creating the app:<\/p>\n

\"Figure<\/a>
Figure 2. Dropbox app Dashboard<\/figcaption><\/figure><\/p>\n

2. The Example<\/h2>\n

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

    \n
  1. JDK 1.7<\/li>\n
  2. Eclipse 4.4 Luna<\/li>\n
  3. Android SDK 4.4<\/li>\n<\/ol>\n
    Tip<\/strong>
    \nYou may skip project creation and jump directly to the     beginning of the example<\/strong><\/a> below.<\/div>\n

    2.1 Creating a New Android Application Project<\/h3>\n

    Open Eclipse IDE and go to File \u2192 New \u2192 Project \u2192 Android Application Project.<\/p>\n

    Fill in the name of the application, the project and the package in the appropriate fields and then click Next.<\/p>\n

    \"Figure<\/a>
    Figure 3. Create a new Android application<\/figcaption><\/figure><\/p>\n

    In the next window, the \u201cCreate Activity\u201d option should be checked. The new created activity will be the main activity of your project. Then press Next button.<\/p>\n

    \"Figure<\/a>
    Figure 4. Configure the project<\/figcaption><\/figure><\/p>\n

    In \u201cConfigure Launcher Icon\u201d window you should choose the icon you want to have in your app. We will use the default icon of android, so click Next.<\/p>\n

    Select the \u201cBlank Activity\u201d option and press Next.<\/p>\n

    \"Figure<\/a>
    Figure 5. Create the activity and select its type<\/figcaption><\/figure><\/p>\n

    You then have to specify a name for the new Activity and a name for the layout description of your app. The .xml files for the layout will automatically be created in the res\/layout<\/code> folder. Finally, press Finish.<\/p>\n

    \"Figure<\/a>
    Figure 6. Create a new blank activity<\/figcaption><\/figure><\/p>\n

    Here is the very final structure of the project, just in case you \u2018ll miss something, while developing:<\/p>\n

    \"Figure<\/a>
    Figure 7. The final structure of the project<\/figcaption><\/figure><\/p>\n

    2.2 Downloading and using dropbox-android-sdk<\/h3>\n

    Download and extract the latest version of dropbox-android-sdk from the official page<\/a>.<\/p>\n

    You then have to import all the dropbox libraries in your project’s libs<\/code> folder. To do so, follow the next steps:<\/p>\n

      \n
    1. Right click on your project and select Properties<\/b>.<\/li>\n
    2. Click Java Build Path<\/b> from the sidebar.<\/li>\n
    3. Select the Libraries<\/b> tab.<\/li>\n
    4. Add External JARs<\/b> and add the libraries.<\/li>\n<\/ol>\n

      Figure 8 displays the fore-mentioned process:<\/p>\n

      \"Figure<\/a>
      Figure 8. Adding Dropbox libraries<\/figcaption><\/figure><\/p>\n

      2.3 Configuring AndroidManifest<\/h3>\n

      What needs to be configured here is:<\/p>\n

        \n
      1. Internet permission.<\/li>\n
      2. Definition of a Dropbox activity.<\/li>\n<\/ol>\n

        It should finally look like this:<\/p>\n

        AndroidManifest.xml<\/span><\/em><\/p>\n

        <?xml version=\"1.0\" encoding=\"utf-8\"?>\n<manifest xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\n    package=\"com.example.testdropbox\"\n    android:versionCode=\"1\"\n    android:versionName=\"1.0\" >\n\n    <uses-sdk\n        android:minSdkVersion=\"8\"\n        android:targetSdkVersion=\"19\" \/>\n    <uses-permission android:name=\"android.permission.INTERNET\" \/> \n\n    <application\n        android:allowBackup=\"true\"\n        android:icon=\"@drawable\/ic_launcher\"\n        android:label=\"@string\/app_name\"\n         >\n        <activity\n            android:name=\".MainActivity\"\n            android:label=\"@string\/app_name\" >\n            <intent-filter>\n                <action android:name=\"android.intent.action.MAIN\" \/>\n\n                <category android:name=\"android.intent.category.LAUNCHER\" \/>\n            <\/intent-filter>\n        <\/activity>\n        \n        <activity\n            android:name=\"com.dropbox.client2.android.AuthActivity\"\n            android:configChanges=\"orientation|keyboard\"\n            android:launchMode=\"singleTask\" >\n            <intent-filter>\n\n                <!-- Change this to be db- followed by your app key -->\n                <data android:scheme=\"db-io0tquh35obwlka\" \/>\n\n                <action android:name=\"android.intent.action.VIEW\" \/>\n\n                <category android:name=\"android.intent.category.BROWSABLE\" \/>\n                <category android:name=\"android.intent.category.DEFAULT\" \/>\n            <\/intent-filter>\n        <\/activity>\n    <\/application>\n\n<\/manifest>\n<\/pre>\n
        2.4 Creating the layout of the Main Activity<\/h3>\n
        activity_main.xml<\/span><\/em>
         
        <\/div> <\/div><\/p>\n
        <?xml version=\"1.0\" encoding=\"utf-8\"?>\n<LinearLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\n    android:layout_width=\"match_parent\"\n    android:layout_height=\"match_parent\"\n    android:layout_marginTop=\"40dp\"\n    android:gravity=\"center_horizontal\"\n    android:orientation=\"vertical\" >\n\n    <Button\n        android:id=\"@+id\/loginBtn\"\n        android:layout_width=\"match_parent\"\n        android:layout_height=\"wrap_content\"\n        android:layout_margin=\"15dp\"\n        android:textAppearance=\"?android:attr\/textAppearanceLarge\"\n        android:textColor=\"#fff\"\n        android:textStyle=\"bold\"\n        android:text=\"Connect with Dropbox\" \/>\n\n    <Button\n        android:id=\"@+id\/uploadFileBtn\"\n        android:layout_width=\"match_parent\"\n        android:layout_height=\"wrap_content\"\n        android:layout_margin=\"15dp\"\n        android:textAppearance=\"?android:attr\/textAppearanceLarge\"\n        android:textColor=\"#fff\"\n        android:textStyle=\"bold\"\n    \tandroid:text=\"File Upload\"  \/>\n\n    <Button\n        android:id=\"@+id\/listFilesBtn\"\n        android:layout_width=\"match_parent\"\n        android:layout_height=\"wrap_content\"\n        android:layout_margin=\"15dp\"\n        android:textAppearance=\"?android:attr\/textAppearanceLarge\"\n        android:textColor=\"#fff\"\n        android:textStyle=\"bold\" \n        android:text=\"List Files\"\/>\n\n    <ScrollView\n        android:layout_width=\"fill_parent\"\n        android:layout_height=\"match_parent\"\n        android:layout_margin=\"10dp\" >\n\n        <LinearLayout\n            android:id=\"@+id\/container_files\"\n            android:layout_width=\"match_parent\"\n            android:layout_height=\"wrap_content\"\n            android:orientation=\"vertical\" >\n        <\/LinearLayout>\n    <\/ScrollView>\n\n<\/LinearLayout>\n<\/pre>\n
        Not much to explain here. Three buttons to login, upload and list files and a scrollable view to display the uploaded files.<\/p>\n
        2.5 Coding the Main Activity<\/h3>\n
        Let’s first navigate to com.javacodegeeks.android.dropboximplementationexample\/MainActivity.java<\/code>. Then, complete the class like below:<\/p>\n
        MainActivity.java<\/span><\/em><\/p>\n
        package com.javacodegeeks.android.dropboximplementationexample;\n\nimport java.util.ArrayList;\n\nimport android.app.Activity;\nimport android.content.SharedPreferences;\nimport android.content.SharedPreferences.Editor;\nimport android.graphics.Color;\nimport android.os.Bundle;\nimport android.os.Handler;\nimport android.os.Message;\nimport android.view.View;\nimport android.view.View.OnClickListener;\nimport android.widget.Button;\nimport android.widget.LinearLayout;\nimport android.widget.TextView;\nimport android.widget.Toast;\n\nimport com.dropbox.client2.DropboxAPI;\nimport com.dropbox.client2.android.AndroidAuthSession;\nimport com.dropbox.client2.session.AccessTokenPair;\nimport com.dropbox.client2.session.AppKeyPair;\nimport com.dropbox.client2.session.Session.AccessType;\nimport com.dropbox.client2.session.TokenPair;\n\npublic class MainActivity extends Activity implements OnClickListener {\n\n\tprivate LinearLayout container;\n\tprivate DropboxAPI dropboxApi;\n\tprivate boolean isUserLoggedIn;\n\tprivate Button loginBtn;\n\tprivate Button uploadFileBtn;\n\tprivate Button listFilesBtn;\n\t\n\tprivate final static String DROPBOX_FILE_DIR = \"\/AndroidDropboxImplementationExample\/\";\n\tprivate final static String DROPBOX_NAME = \"dropbox_prefs\";\n\tprivate final static String ACCESS_KEY = \"io0tquh35obwlka\";\n\tprivate final static String ACCESS_SECRET = \"mfmq5bgjjuqll0d\";\n\tprivate final static AccessType ACCESS_TYPE = AccessType.DROPBOX;\n\t\n\t@Override\n\tpublic void onCreate(Bundle savedInstanceState) {\n\t\tsuper.onCreate(savedInstanceState);\n\t\tsetContentView(R.layout.activity_main);\n\n\t\tloginBtn = (Button) findViewById(R.id.loginBtn);\n\t\tloginBtn.setOnClickListener(this);\n\t\tuploadFileBtn = (Button) findViewById(R.id.uploadFileBtn);\n\t\tuploadFileBtn.setOnClickListener(this);\n\t\tlistFilesBtn = (Button) findViewById(R.id.listFilesBtn);\n\t\tlistFilesBtn.setOnClickListener(this);\n\t\tcontainer = (LinearLayout) findViewById(R.id.container_files);\n\t\t\n\t\tloggedIn(false);\n\n\t\tAppKeyPair appKeyPair = new AppKeyPair(ACCESS_KEY, ACCESS_SECRET);\n\t\tAndroidAuthSession session;\n\t\t\n\t\tSharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0);\n\t\tString key = prefs.getString(ACCESS_KEY, null);\n\t\tString secret = prefs.getString(ACCESS_SECRET, null);\n\n\t\tif (key != null && secret != null) {\n\t\t\tAccessTokenPair token = new AccessTokenPair(key, secret);\n\t\t\tsession = new AndroidAuthSession(appKeyPair, ACCESS_TYPE, token);\n\t\t} else {\n\t\t\tsession = new AndroidAuthSession(appKeyPair, ACCESS_TYPE);\n\t\t}\n\n\t\tdropboxApi = new DropboxAPI(session);\n\t}\n\n\t@Override\n\tprotected void onResume() {\n\t\tsuper.onResume();\n\n\t\tAndroidAuthSession session = dropboxApi.getSession();\n\t\tif (session.authenticationSuccessful()) {\n\t\t\ttry {\n\t\t\t\tsession.finishAuthentication();\n\n\t\t\t\tTokenPair tokens = session.getAccessTokenPair();\n\t\t\t\tSharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0);\n\t\t\t\tEditor editor = prefs.edit();\n\t\t\t\teditor.putString(ACCESS_KEY, tokens.key);\n\t\t\t\teditor.putString(ACCESS_SECRET, tokens.secret);\n\t\t\t\teditor.commit();\n\n\t\t\t\tloggedIn(true);\n\t\t\t} catch (IllegalStateException e) {\n\t\t\t\tToast.makeText(this, \"Error during Dropbox authentication\",\n\t\t\t\t\t\tToast.LENGTH_SHORT).show();\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate final Handler handler = new Handler() {\n\t\tpublic void handleMessage(Message message) {\n\t\t\tArrayList result = message.getData().getStringArrayList(\"data\");\n\t\t\t\n\t\t\tfor (String fileName : result) {\n\t\t\t\tTextView textView = new TextView(MainActivity.this);\n\t\t\t\ttextView.setText(fileName);\n\t\t\t\tcontainer.addView(textView);\n\t\t\t}\n\t\t}\n\t};\n\n\t@Override\n\tpublic void onClick(View v) {\n\t\tswitch (v.getId()) {\n\t\tcase R.id.loginBtn:\n\t\t\tif (isUserLoggedIn) {\n\t\t\t\tdropboxApi.getSession().unlink();\n\t\t\t\tloggedIn(false);\n\t\t\t} else {\n\t\t\t\tdropboxApi.getSession().startAuthentication(MainActivity.this);\n\t\t\t}\n\t\t\tbreak;\n\t\tcase R.id.uploadFileBtn:\n\t\t\tUploadFile uploadFile = new UploadFile(this, dropboxApi,\n\t\t\t\t\tDROPBOX_FILE_DIR);\n\t\t\tuploadFile.execute();\n\t\t\tbreak;\n\t\tcase R.id.listFilesBtn:\n\t\t\tListFiles listFiles = new ListFiles(dropboxApi, DROPBOX_FILE_DIR,\n\t\t\t\t\thandler);\n\t\t\tlistFiles.execute();\n\t\t\tbreak;\n\t\tdefault:\n\t\t\tbreak;\n\t\t}\n\t}\n\t\n\tpublic void loggedIn(boolean userLoggedIn) {\n\t\tisUserLoggedIn = userLoggedIn;\n\t\tuploadFileBtn.setEnabled(userLoggedIn);\n\t\tuploadFileBtn.setBackgroundColor(userLoggedIn ? Color.BLUE : Color.GRAY);\n\t\tlistFilesBtn.setEnabled(userLoggedIn);\n\t\tlistFilesBtn.setBackgroundColor(userLoggedIn ? Color.BLUE : Color.GRAY);\n\t\tloginBtn.setText(userLoggedIn ? \"Logout\" : \"Log in\");\n\t}\n}\n<\/pre>\n
        You first have to define the app key and app secret, generated from the dropbox developer console. In addition, for full dropbox interaction, you should provide DROPBOX<\/code> AccessType (line 39). Moreover, in line 35, we define the folder that we ‘ll use from our app to interact with our dropbox account (upload\/list files); if the provided name doesn’t correspond to an existing folder, a new folder will automatically be created.[ulp id='XSQzgZ7lDbTb31Tj']<\/p>\n
        Furthermore, for better UI interaction, session handling and user authentication, we created the private, loggedIn<\/code> function (lines 135-142).<\/p>\n
        Our activity class implements the OnClickListener<\/a><\/code> interface, because there is a corresponding button for each one of the three fore-mentioned, available in our app, actions.<\/p>\n
        On the very first access to our app, we want the user to be unable to press any other, except the login button. Thus, in line 54, we call the loggedIn<\/code> function with a false<\/b> value.
        \nLines 56-70 describe the authentication process, either if the user has selected to save his credentials or not. Especially, if not, we create a new session with the existing app key, app secret and access type (line 67); otherwise, we retrieve his credentials with the help of         SharedPreferences<\/a><\/code> and create a session using them (lines 59-65).<\/p>\n
        We override the onResume<\/code> method to continue a valid session in case of pausing the app. Again, this happens with the help og SharedPreferences<\/code>. Obviously, we here pass a true<\/b> value to our loggedIn<\/code> function.<\/p>\n
        2.6 Coding the UploadFile Activity<\/h3>\n
        While in the same package, create a new class called “UploadFile.java”, with the following code:<\/p>\n
        UploadFile.java<\/span><\/em><\/p>\n
        package com.javacodegeeks.android.dropboximplementationexample;\n\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileWriter;\nimport java.io.IOException;\n\nimport android.content.Context;\nimport android.os.AsyncTask;\nimport android.widget.Toast;\n\nimport com.dropbox.client2.DropboxAPI;\nimport com.dropbox.client2.exception.DropboxException;\n\npublic class UploadFile extends AsyncTask {\n\n\tprivate DropboxAPI dropboxApi;\n\tprivate String path;\n\tprivate Context context;\n\n\tpublic UploadFile(Context context, DropboxAPI dropboxApi,\n\t\t\tString path) {\n\t\tthis.context = context.getApplicationContext();\n\t\tthis.dropboxApi = dropboxApi;\n\t\tthis.path = path;\n\t}\n\n\t@Override\n\tprotected Boolean doInBackground(Void... params) {\n\t\tfinal File tempDropboxDirectory = context.getCacheDir();\n\t\tFile tempFileToUploadToDropbox;\n\t\tFileWriter fileWriter = null;\n\t\t\n\t\ttry {\n\t\t\t\/\/ Creating a temporal file.\n\t\t\ttempFileToUploadToDropbox = File.createTempFile(\"file\", \".txt\", tempDropboxDirectory);\n\t\t\tfileWriter = new FileWriter(tempFileToUploadToDropbox);\n\t\t\tfileWriter.write(\"Hello World drom Android Dropbox Implementation Example!\");\n\t\t\tfileWriter.close();\n\n\t\t\t\/\/ Uploading the newly created file to Dropbox.\n\t\t\tFileInputStream fileInputStream = new FileInputStream(tempFileToUploadToDropbox);\n\t\t\tdropboxApi.putFile(path + \"hello_world.txt\", fileInputStream,\n\t\t\t\t\ttempFileToUploadToDropbox.length(), null, null);\n\t\t\ttempFileToUploadToDropbox.delete();\n\t\t\t\n\t\t\treturn true;\n\t\t} catch (IOException e) {\n\t\t\te.printStackTrace();\n\t\t} catch (DropboxException e) {\n\t\t\te.printStackTrace();\n\t\t}\n\t\t\n\t\treturn false;\n\t}\n\n\t@Override\n\tprotected void onPostExecute(Boolean result) {\n\t\tif (result) {\n\t\t\tToast.makeText(context, \"File has been successfully uploaded!\",\n\t\t\t\t\tToast.LENGTH_LONG).show();\n\t\t} else {\n\t\t\tToast.makeText(context, \"An error occured while processing the upload request.\",\n\t\t\t\t\tToast.LENGTH_LONG).show();\n\t\t}\n\t}\n}\n<\/pre>\n
        The purpose of this class is to create a temporal file and upload it to the dropbox account that our android app is connected to. In order to implement this job effectively, we have to to extends the AsyncTask<\/a><\/code> class.<\/p>\n
        2.7 Coding the ListFiles Activity<\/h3>\n
        ListFiles.java<\/span><\/em><\/p>\n
        package com.javacodegeeks.android.dropboximplementationexample;\n\nimport java.util.ArrayList;\n\nimport android.os.AsyncTask;\nimport android.os.Bundle;\nimport android.os.Handler;\nimport android.os.Message;\nimport com.dropbox.client2.DropboxAPI;\nimport com.dropbox.client2.DropboxAPI.Entry;\nimport com.dropbox.client2.exception.DropboxException;\n\npublic class ListFiles extends AsyncTask<Void, Void, ArrayList> {\n\n\tprivate DropboxAPI dropboxApi;\n\tprivate String path;\n\tprivate Handler handler;\n\n\tpublic ListFiles(DropboxAPI dropboxApi, String path, Handler handler) {\n\t\tthis.dropboxApi = dropboxApi;\n\t\tthis.path = path;\n\t\tthis.handler = handler;\n\t}\n\n\t@Override\n\tprotected ArrayList doInBackground(Void... params) {\n\t\tArrayList files = new ArrayList();\n\t\ttry {\n\t\t\tEntry directory = dropboxApi.metadata(path, 1000, null, true, null);\n\t\t\tfor (Entry entry : directory.contents) {\n\t\t\t\tfiles.add(entry.fileName());\n\t\t\t}\n\t\t} catch (DropboxException e) {\n\t\t\te.printStackTrace();\n\t\t}\n\t\treturn files;\n\t}\n\n\t@Override\n\tprotected void onPostExecute(ArrayList result) {\n\t\tMessage message = handler.obtainMessage();\n\t\tBundle bundle = new Bundle();\n\t\tbundle.putStringArrayList(\"data\", result);\n\t\tmessage.setData(bundle);\n\t\thandler.sendMessage(message);\n\t}\n}\n<\/pre>\n
        We follow a similar concept here, like in UploadFile.java<\/code>. The important point is that we need to obtain the available, in the specified dropbox directory, files . This is implemented by the Handler<\/a><\/code> object that is being passed from MainActivity.java<\/code> to ListFiles.java<\/code> as a constructor argument.<\/p>\n
        In detail, lines 97-107 from MainActivity.java<\/code> display each file in a TextView<\/code>; These files are obtained from a Message<\/code> object, created in onPostExecute<\/code> of ListFiles.java<\/code>.<\/p>\n
        2.8 Running the application<\/h3>\n
        This is the initial screen of our app:<\/p>\n
        \"Figure<\/a>
        Figure 9. Initial state of the app<\/figcaption><\/figure><\/p>\n
        After hitting the login button, a credentials screen is poped up. Having provided our credentials, a dropbox access permission is required, so tap on the “Allow” button and this is the app screen of a successful authentication:<\/p>\n
        \"Figure<\/a>
        Figure 10. Logged in Dropbox<\/figcaption><\/figure><\/p>\n
        Let’s upload a file, just to validate our app’s functionality:<\/p>\n
        \"Figure<\/a>
        Figure 11. Upload file to Dropbox<\/figcaption><\/figure><\/p>\n
        Having received the successful notification, let’s now tap the “List Files” button:<\/p>\n
        \"Figure<\/a>
        Figure 12. List Dropbox files<\/figcaption><\/figure><\/p>\n
        You can also check the update in your dropbox account, from a web browser, under the folder AndroidDropboxImplementationExample<\/code> (this should be placed the root directory):<\/i><\/p>\n
        \"Figure<\/a>
        Figure 13. Dropbox folder updated<\/figcaption><\/figure><\/p>\n
        3. Download the Eclipse Project<\/h2>\n
        This was an example on how to create an Android Dropbox Application.<\/p>\n
        Download<\/strong>
        \nYou can download the full source code of this example here:         AndroidDropboxImplementationExample.zip<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
        1. Creating a Dropbox Application Visit https:\/\/www.dropbox.com\/developers\/apps and after signing-in with an existing account, click on the “Create app” button, on the top right corner. Configure the app like below and click on “Create App”: [ulp id=’XSQzgZ7lDbTb31Tj’] Once the app is created, you will be redirected to its dashboard, where you can find all the …<\/p>\n","protected":false},"author":12,"featured_media":1202,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[827],"class_list":["post-17827","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android","tag-dropboxapi"],"yoast_head":"\nAndroid Dropbox Implementation Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"1. 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