ContentProvider-获取系统数据

代码来至Android/Ophone开发完全讲义

首先在模拟器的通讯录中添加几个联系人

 

 

 

public class Main extends ListActivity implements OnMenuItemClickListener
{
    private Cursor cursor;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        cursor = getContentResolver().query(Phones.CONTENT_URI, new String[]{"_id","name","number"}, null,
                null, "name desc");

        startManagingCursor(cursor);
        ListAdapter adapter = new SimpleCursorAdapter(this,
                android.R.layout.simple_list_item_2, cursor, new String[]
                { Phones.NAME, Phones.NUMBER }, new int[]
                { android.R.id.text1, android.R.id.text2 });
        setListAdapter(adapter);

    }

    @Override
    public boolean onMenuItemClick(MenuItem item)
    {
        String columnNames = "";
        for (int i = 0; i < cursor.getColumnCount(); i++)
        {
            columnNames += "<" + cursor.getColumnName(i) + ">";
        }
        new AlertDialog.Builder(this).setTitle("联系人的所有字段").setMessage(
                columnNames).show();
        return false;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        menu.add("显示联系人的所有字段").setOnMenuItemClickListener(this);
        return super.onCreateOptionsMenu(menu);
    }

}

 结果：

 

 具体看源码，下面可以下载