Android开始之 数据存储—访问通讯录

通讯录：管理联系人

1.修改数据

2.访问数据

3.将数据放入适配器并显示

需要权限：

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

布局文件：TextView

在模拟器通讯录中创建一个联系人：

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public class MainActivity extends ActionBarActivity implements
        LoaderCallbacks<Cursor> {
    private TextView textView;
    private LoaderManager manager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
        textView = (TextView) findViewById(R.id.mag);
        manager = getLoaderManager();
        manager.initLoader(1001, null, this);// 初始化

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
            return rootView;
        }
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        // TODO Auto-generated method stub
        Uri uri = ContactsContract.Contacts.CONTENT_URI;
        CursorLoader loader = new CursorLoader(this, uri, null, null, null,
                null);

        return loader;
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        // TODO Auto-generated method stub
        StringBuffer buffer = new StringBuffer();
        while (data.moveToNext()) {
            int nameindex = data
                    .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
            String dispaly_name = data.getString(nameindex);
            buffer.append("name: " + dispaly_name+" Tel :");
            // 获得通讯录每一条记录的ID
            int _id = data.getInt(data
                    .getColumnIndex(ContactsContract.Contacts._ID));
            Cursor cursor = getContentResolver().query(
                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                    null,
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "="
                            + _id, null, null);
            while(cursor.moveToNext()){
                String phone=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                buffer.append(phone);
            }

        }
        textView.setText(buffer.toString());
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        // TODO Auto-generated method stub

    }

}

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