Let us look at a Android Account and AccountManager examples.

Example 1: Account & AccountManager

This example will help you learn the following concepts:

  1. How to initialize the AccountManager in Android
  2. How to get an array of all accounts in an android device
  3. How to get accounts and show them in a ListView in Android.

This example will comprise the following files:

  • ListItem.java
  • ListItemAdapter.java
  • MainActivity.java

Step 1: Create Project

  1. Open your AndroidStudio IDE.
  2. Go to File-->New-->Project to create a new project.

Step 2: Add Dependencies

Step 3: Design Layouts

*(a). activity_main.xml

Create a file named activity_main.xml and design it as follows:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView android:id="@+id/listview1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

*(b). list_item.xml

Create a file named list_item.xml and design it as follows:

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

    <TextView android:id="@+id/list_item_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <TextView android:id="@+id/list_item_type"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

Step 4: Write Code

Write Code as follows:

*(a). ListItem.java

Create a file named ListItem.java

Create a class to represent a List item

public class ListItem { 

Add ListItem properties

    public String name;
    public String type;

Here is the full code

package com.bgstation0.android.sample.account_;

public class ListItem { 
    //end
    public String name;
    public String type;
    //end
}

*(b). ListItemAdapter.java

Create a file named ListItemAdapter.java

Create an adapter class by extending the ArrayAdapter

public class ListItemAdapter extends ArrayAdapter<ListItem> {

Initialize a LayoutInflater to null

    LayoutInflater mInflater = null;    // mInflaternullŏ.

Take a Context, Integer, and ListItem objects as parameters via the constructor

    public ListItemAdapter(Context context, int resource, ListItem[] objects){

Pass them to the constructor of the super class

        super(context, resource, objects);  

Initialize the LayoutInflater using the context.getSystemService(). Pass in the LAYOUT_INFLATER_SERVICE

        mInflater = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);

Override the getView() function

    @Override
    public View getView(int position, View convertView, ViewGroup parent){

Check if the View object is null. Only then shall we inflate:

        if (convertView == null){
            convertView = mInflater.inflate(R.layout.list_item, null);  // nullȂ琶.
        }

Reference widgets and set their values:

        TextView tvName = (TextView)convertView.findViewById(R.id.list_item_name);  // tvName.
        tvName.setText(getItem(position).name); // name
        TextView tvType = (TextView)convertView.findViewById(R.id.list_item_type);  // tvType.
        tvType.setText(getItem(position).type); // type

Here is the full code

package com.bgstation0.android.sample.account_;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class ListItemAdapter extends ArrayAdapter<ListItem> {
//end
    LayoutInflater mInflater = null;    // mInflaternullŏ.
    //end
    public ListItemAdapter(Context context, int resource, ListItem[] objects){
        //end
        super(context, resource, objects);  
        //end
        mInflater = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        //end
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        //end
        if (convertView == null){
            convertView = mInflater.inflate(R.layout.list_item, null);  // nullȂ琶.
        }
        //end
        TextView tvName = (TextView)convertView.findViewById(R.id.list_item_name);  // tvName.
        tvName.setText(getItem(position).name); // name
        TextView tvType = (TextView)convertView.findViewById(R.id.list_item_type);  // tvType.
        tvType.setText(getItem(position).type); // type
        //end
        return convertView; // convertView.
    }

}

*(c). MainActivity.java

Create a file named MainActivity.java

Add our imports including the android.accounts.Account and android.accounts.AccountManager classes.

import java.util.ArrayList;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;

Create our MainActivity. Extend the Activity class:

public class MainActivity extends Activity {

Override the onCreaet() function:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

Initialize the AccountManagerby invoking the get() method and passing the Context:

        AccountManager accountManager = AccountManager.get(this);   // accountManager

Create an ArrayList of ListItem objects

        ArrayList<ListItem> list = new ArrayList<ListItem>();

Invoke the getAccounts() to get all the accounts in the device.

        Account[] accounts = accountManager.getAccounts();

Add all the accounts to our List.

        for (Account account : accounts){
            ListItem item = new ListItem();
            item.name = account.name;
            item.type = account.type;   
            list.add(item); 
        }

Reference a ListView

        ListView listView1 = (ListView)findViewById(R.id.listview1);

Set the adapter

        ListItem[] array = new ListItem[list.size()];   // array𐶐
        ListItemAdapter listItemAdapter = new ListItemAdapter(this, R.layout.list_item, list.toArray(array));   // arrayAdapter𐶐.
        listView1.setAdapter(listItemAdapter);  // listItemAdapter

Here is the full code

package com.bgstation0.android.sample.account_;
import java.util.ArrayList;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;
//end
public class MainActivity extends Activity {
//end
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //end
        AccountManager accountManager = AccountManager.get(this);   // accountManager
        //end

        ArrayList<ListItem> list = new ArrayList<ListItem>();
        //end
        Account[] accounts = accountManager.getAccounts();
        //end
        for (Account account : accounts){
            ListItem item = new ListItem();
            item.name = account.name;
            item.type = account.type;   
            list.add(item); 
        }
        //end
        ListView listView1 = (ListView)findViewById(R.id.listview1);
        //end

        ListItem[] array = new ListItem[list.size()];   // array𐶐
        ListItemAdapter listItemAdapter = new ListItemAdapter(this, R.layout.list_item, list.toArray(array));   // arrayAdapter𐶐.
        listView1.setAdapter(listItemAdapter);  // listItemAdapter
        //end

    }

}

Run

Simply copy the source code into your Android Project,Build and Run.

Example 2: Initialize AccountManager

This tutorial will help you learn the following concepts:

  1. How to get the AccountManager

This example will comprise the following files:

  • MainActivity.java

Step 1: Create Project

  1. Open your AndroidStudio IDE.
  2. Go to File-->New-->Project to create a new project.

Step 2: Dependencies

No dependencies are needed.

Step 3: Design Layouts

*(a). activity_main.xml

Create a file named activity_main.xml and design it as follows:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

Step 4: Write Code

Write Code as follows:

*(a). MainActivity.java

Create a file named MainActivity.java

Simply use the the get() method and pass in the context

        AccountManager accountManager = AccountManager.get(this);

Then you can cast it to string and show it:

        Toast.makeText(this, "accountManager = " + accountManager.toString(), Toast.LENGTH_LONG).show();    // accountManagero.

Here is the full code

package com.bgstation0.android.sample.accountmanager_;

import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AccountManager accountManager = AccountManager.get(this);
        //end
        Toast.makeText(this, "accountManager = " + accountManager.toString(), Toast.LENGTH_LONG).show();    // accountManagero.
        //end
    }

}

Run

Simply copy the source code into your Android Project,Build and Run.

Example 3: Get AccountManager and Show it

This tutorial will help you learn the following concepts:

  1. How to get the AccountManager and show it in a Toast message

This example will comprise the following files:

  • MainActivity.java

Step 1: Create Project

  1. Open your AndroidStudio IDE.
  2. Go to File-->New-->Project to create a new project.

Step 2: Add Dependencies

Step 3: Design Layouts

*(a). activity_main.xml

Create a file named activity_main.xml and design it as follows:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

Step 4: Write Code

Write Code as follows:

*(a). MainActivity.java

Create a file named MainActivity.java

Import AccountManager among other imports:

import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

Create a MainActivity

public class MainActivity extends Activity {

Override the onCreate:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

Invoke the AccountManager.get(), passing in the context and cast it to string then show in a Toast message

        Toast.makeText(this, AccountManager.get(this).toString(), Toast.LENGTH_LONG).show();    // AccountManager.get(this)g[Xg.

Here is the full code

package com.bgstation0.android.sample.accountmanager_;
import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
//end
public class MainActivity extends Activity {
//end
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //end
        Toast.makeText(this, AccountManager.get(this).toString(), Toast.LENGTH_LONG).show();    // AccountManager.get(this)g[Xg.
        //end
    }

}

Run

Simply copy the source code into your Android Project,Build and Run.

Example 4: List All Accounts

This example will comprise the following files:

  • ListItem.java
  • ListItemAdapter.java
  • MainActivity.java

Step 1: Create Project

  1. Open your AndroidStudio IDE.
  2. Go to File-->New-->Project to create a new project.

Step 2: Dependencies

No dependencies are needed.

Step 3: Design Layouts

*(a). activity_main.xml

Create a file named activity_main.xml and design it as follows:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView android:id="@+id/listview1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

*(b). list_item.xml

Create a file named list_item.xml and design it as follows:

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

    <TextView android:id="@+id/list_item_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

Step 4: Write Code

Write Code as follows:

*(a). ListItem.java

Create a file named ListItem.java

Here is the full code

package com.bgstation0.android.sample.accountmanager_;

// XgACeNXListItem
public class ListItem { // ListItem̒`.
    public String name; // O.
}

*(b). ListItemAdapter.java

Create a file named ListItemAdapter.java

Here is the full code

package com.bgstation0.android.sample.accountmanager_;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

// ListItempA_v^[ListItemAdapter
public class ListItemAdapter extends ArrayAdapter<ListItem> {

    // otB[h̒`.
    LayoutInflater mInflater = null;    // mInflaternullŏ.

    // RXgN^
    public ListItemAdapter(Context context, int resource, ListItem[] objects){
        super(context, resource, objects);  // eRXgN^.
        mInflater = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);  // mInflater̎擾.
    }

    // ACẽJX^}CY.
    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        // convertViewnull̎.
        if (convertView == null){
            convertView = mInflater.inflate(R.layout.list_item, null);  // nullȂ琶.
        }
        TextView tvName = (TextView)convertView.findViewById(R.id.list_item_name);  // tvName擾.
        tvName.setText(getItem(position).name); // nameZbg.
        return convertView; // convertViewԂ.
    }

}

*(c). MainActivity.java

Create a file named MainActivity.java

Here is the full code

package com.bgstation0.android.sample.accountmanager_;

import java.util.ArrayList;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // AccountManagerIuWFNg擾, .
        AccountManager accountManager = AccountManager.get(this);   // accountManagerɊi[.

        // AJEgXg̎擾.
        ArrayList<ListItem> list = new ArrayList<ListItem>();   // list𐶐.
        Account[] accounts = accountManager.getAccounts();  // accountManager.getAccountsaccounts擾.
        for (Account account : accounts){   // accountsaccountôvfJԂ.
            ListItem item = new ListItem(); // item𐶐.
            item.name = account.name;   // item.nameaccount.nameZbg.
            list.add(item); // list.additemlj.
        }

        // listView1̎擾.
        ListView listView1 = (ListView)findViewById(R.id.listview1);    // listView1擾.

        // ListItemAdapter̐.
        ListItem[] array = new ListItem[list.size()];   // array𐶐.
        ListItemAdapter listItemAdapter = new ListItemAdapter(this, R.layout.list_item, list.toArray(array));   // arrayAdapter𐶐.
        listView1.setAdapter(listItemAdapter);  // listItemAdapterZbg.

    }

}

Run

Simply copy the source code into your Android Project,Build and Run.

Example 5: Get Accounts By Type

This tutorial will help you learn the following concepts:

  1. How to get Accounts by Type in an Android Device

This example will comprise the following files:

  • ListItem.java
  • ListItemAdapter.java
  • MainActivity.java

Step 1: Create Project

  1. Open your AndroidStudio IDE.
  2. Go to File-->New-->Project to create a new project.

Step 2: Add Dependencies

Step 3: Design Layouts

*(a). activity_main.xml

Create a file named activity_main.xml and design it as follows:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView android:id="@+id/listview1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

*(b). list_item.xml

Create a file named list_item.xml and design it as follows:

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

    <TextView android:id="@+id/list_item_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <TextView android:id="@+id/list_item_type"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

Step 4: Write Code

Write Code as follows:

*(a). ListItem.java

Create a file named ListItem.java

Create a simple model class

public class ListItem {
    public String name;
    public String type; 
}

Here is the full code

package com.bgstation0.android.sample.accountmanager_;

public class ListItem {
    public String name;
    public String type; 
}
//end

*(b). ListItemAdapter.java

Create a file named ListItemAdapter.java

Extend the ArrayAdapter

public class ListItemAdapter extends ArrayAdapter<ListItem> {

Create the constructor

```java
    public ListItemAdapter(Context context, int resource, ListItem[] objects){
        super(context, resource, objects);
        mInflater = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
    }

Override the getView() method. We inflate our list_item layout here:

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        // convertViewnull̎.
        if (convertView == null){
            convertView = mInflater.inflate(R.layout.list_item, null);
        }
        TextView tvName = (TextView)convertView.findViewById(R.id.list_item_name);  // tvName.
        tvName.setText(getItem(position).name); // name.
        TextView tvType = (TextView)convertView.findViewById(R.id.list_item_type);  // tvType.
        tvType.setText(getItem(position).type); // type.
        return convertView; // convertViewԂ.
    }

Here is the full code

package com.bgstation0.android.sample.accountmanager_;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class ListItemAdapter extends ArrayAdapter<ListItem> {
//end
    //Initialize the `LayoutInflater` to null
    LayoutInflater mInflater = null;
    //end
    public ListItemAdapter(Context context, int resource, ListItem[] objects){
        super(context, resource, objects);
        mInflater = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
    }
    //end

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        // convertViewnull̎.
        if (convertView == null){
            convertView = mInflater.inflate(R.layout.list_item, null);
        }
        TextView tvName = (TextView)convertView.findViewById(R.id.list_item_name);  // tvName.
        tvName.setText(getItem(position).name); // name.
        TextView tvType = (TextView)convertView.findViewById(R.id.list_item_type);  // tvType.
        tvType.setText(getItem(position).type); // type.
        return convertView; // convertViewԂ.
    }
        //end

}

*(c). MainActivity.java

Create a file named MainActivity.java

Add your imports

import java.util.ArrayList;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

Extend the Activity class:

public class MainActivity extends Activity {

Get the AccountManager instance:

```java
        AccountManager accountManager = AccountManager.get(this);

Create an arraylist of ListItem objects

        ArrayList<ListItem> list = new ArrayList<ListItem>();

If you want to get Accounts use the getAccounts() method

        //Account[] accounts = accountManager.getAccounts();    // accountManager.getAccounts()

To get the accounts by type use the getAccountsByType() method as shown below:

        Account[] accounts = accountManager.getAccountsByType("com.google");

Now loop through the accounts and add them to our List

        for (Account account : accounts){
            ListItem item = new ListItem();
            item.name = account.name;
            item.type = account.type;
            list.add(item);
        }

Prepare a ListView

        ListView listView1 = (ListView)findViewById(R.id.listview1);

Bind the accounts to our adapter and then the adapter to the ListView:

        ListItem[] array = new ListItem[list.size()];   // array𐶐.
        ListItemAdapter listItemAdapter = new ListItemAdapter(this, R.layout.list_item, list.toArray(array));   // arrayAdapter𐶐.
        listView1.setAdapter(listItemAdapter);  

Here is the full code

package com.bgstation0.android.sample.accountmanager_;

import java.util.ArrayList;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
//end
public class MainActivity extends Activity {
//end
//Override the `onCreate()`:
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //end

        AccountManager accountManager = AccountManager.get(this);
        //end

        ArrayList<ListItem> list = new ArrayList<ListItem>();
        //end
        //Account[] accounts = accountManager.getAccounts();    // accountManager.getAccounts()
        //end
        Account[] accounts = accountManager.getAccountsByType("com.google");
        //end
        for (Account account : accounts){
            ListItem item = new ListItem();
            item.name = account.name;
            item.type = account.type;
            list.add(item);
        }
        //end

        ListView listView1 = (ListView)findViewById(R.id.listview1);
        //end

        ListItem[] array = new ListItem[list.size()];   // array𐶐.
        ListItemAdapter listItemAdapter = new ListItemAdapter(this, R.layout.list_item, list.toArray(array));   // arrayAdapter𐶐.
        listView1.setAdapter(listItemAdapter);  
        //end

    }

}

Run

Simply copy the source code into your Android Project,Build and Run.


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