Android Content Provider详解及示例代码

package android.basic.lesson20;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainContentProvider extends Activity {

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

        Button b1 = (Button) findViewById(R.id.Button01);

        OnClickListener ocl = new OnClickListener() {

            @Override
            public void onClick(View v) {
                ContentResolver contentResolver = getContentResolver();
                // 获得所有的联系人
                Cursor cursor = contentResolver.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
                // 循环遍历
                if (cursor.moveToFirst()) {

                    int idColumn = cursor.getColumnIndex(ContactsContract.Contacts._ID);

                    int displayNameColumn = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);

                    do {
                        // 获得联系人的ID号
                        String contactId = cursor.getString(idColumn);

                        // 获得联系人姓名
                        String disPlayName = cursor.getString(displayNameColumn);

                        Toast.makeText(MainContentProvider.this, "联系人姓名："+disPlayName,
                                Toast.LENGTH_LONG).show();

                        // 查看该联系人有多少个电话号码。如果没有这返回值为0
                        int phoneCount = cursor.getInt(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));

                        if (phoneCount > 0) {

                            // 获得联系人的电话号码列表
                            Cursor phonesCursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,
                                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID
                                            + " = " + contactId, null, null);

                            if (phonesCursor.moveToFirst()) {
                                do {
                                    // 遍历所有的电话号码
                                    String phoneNumber = phonesCursor
                                            .getString(phonesCursor
                                                    .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                                    Toast.makeText(MainContentProvider.this, "联系人电话："+phoneNumber,
                                            Toast.LENGTH_LONG).show();
                                } while (phonesCursor.moveToNext());
                            }
                        }

                    } while (cursor.moveToNext());
                }
            }
        };

        b1.setOnClickListener(ocl);
    }

}

<uses-permission android:name="android.permission.GET_ACCOUNTS" />
     <uses-permission android:name="android.permission.READ_CONTACTS" />