Android - 读取ContentProvider内的数据

读取ContentProvider内的数据

本文地址：http://blog.csdn.net/caroline_wendy

读取ContentProvider的数据，需要使用ContentResolver，解析其中的内容，反馈给游标(Cursor)；

游标(Cursor)默认指向-1，需要移动cursor.moveToNext()，query需要解析URI，返回列值使用字符串；

URI和字符串：

    public static final String AUTHORITY = "me.cxxxyx.healthtool.provider";    public static final class StepCounter implements BaseColumns    {        public static final String TABLE_NAME = "stepcounter";        public static final String STEP = "step";        public final static Uri STEP_CONTENT_URI = Uri.parse("content://" +  AUTHORITY + "/step");    }

解析器(Resolver)具体使用：

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_my);        ContentResolver cr; //内容解析器        TextView mTextView; //显示界面        mTextView = (TextView) findViewById(R.id.steps);        //通过contentResolver进行查找        cr = this.getContentResolver();        Cursor cursor = cr.query(ContentData.StepCounter.STEP_CONTENT_URI, null, null, null, null);        String str = "";        while (cursor.moveToNext()) {            str = cursor.getString(cursor.getColumnIndex(ContentData.StepCounter.STEP));            Toast.makeText(this, str, Toast.LENGTH_SHORT).show();        }        mTextView.setText(str);        cursor.close();  //查找后关闭游标    }