Content User Example

This example shows how to use built-in content providers. There are only two significant files - the activity ContentUserDemo and the layout file (less significant).

ContentUserDemo.java

Notice the reference to the built-in Peope content provider. It provides us with the list of people in our address book.

package org.example.cp;

import java.util.ArrayList;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class ContentUserDemo extends Activity {
    private static final String TAG = "ContentUserDemo";
    private ArrayList<String> list;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Get content provider and cursor
        ContentResolver r = getContentResolver();
        Cursor cursor = r.query(People.CONTENT_URI, null, null, null, null);


        // Let activity manage the cursor
        startManagingCursor(cursor);
        Log.d(TAG, "cursor.getCount()=" + cursor.getCount());

        // Get value from content provider
        int nameIndex = cursor.getColumnIndexOrThrow(People.NAME);
        int numberIndex = cursor.getColumnIndexOrThrow(People.NUMBER);

        cursor.moveToFirst();
        list = new ArrayList<String>();
        do {
            String name = cursor.getString(nameIndex);
            String number = cursor.getString(numberIndex);
            list.add(name + ": " + number);
        } while (cursor.moveToNext());

        // Get the list view
        ListView listView = (ListView) findViewById(R.id.listView);
        ArrayAdapter<String> aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
        listView.setAdapter(aa);
    }
}

 

layout/main.xml

This layout just dumps the data in a ListView. One interesting part is linking the ArrayAdapter to the ListView, in the previous file.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ListView android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:id="@+id/listView"></ListView>
</LinearLayout>

 

AndroidManifest.xml

Don't forget to ask for permission to read the contacts from the system Content Provider.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.example.cp" android:versionCode="1" android:versionName="1.0.0">
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".ContentUserDemo" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

 

Results

You should see the list of people from your Contacts printed in your own application.

 

 

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