内容解析者（ContentResolver）

参考博客

使用ContentResolver调用ContentProvider提供的接口，操作数据
当外部应用需要对ContentProvider中的数据进行添加、删除、修改和查询操作时，可以使用ContentResolver 类来完成，要获取ContentResolver 对象，

1. 获取ContentResolver对象

ContentResolver contentResolver = context.getContentResolver();

获取图片

   mCursor = contentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null,
         MediaStore.Images.Media.MIME_TYPE + "=? or "
                 + MediaStore.Images.Media.MIME_TYPE + "=?",
        new String[]{"image/jpeg", "image/png"},
        MediaStore.Images.Media.DATE_MODIFIED);

获取视频

            Uri mVideoUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            mCursor = contentResolver.query(mVideoUri, null,
                    MediaStore.Video.Media.MIME_TYPE + "=?",
                    new String[]{"video/mp4"},
                    MediaStore.Video.Media.DATE_MODIFIED);

根据cursor获取内容

        while (mCursor.moveToNext()) {
            String path = mCursor.getString(mCursor
                    .getColumnIndex(MediaStore.Images.Media.DATA));

            long size = mCursor.getLong(mCursor
                    .getColumnIndex(MediaStore.Images.Media.SIZE));

            String display_name = mCursor.getString(mCursor
                    .getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME));

            String parentName = new File(path).getParentFile().getName();

读取短信

Cursor cursor = resolver.query(Uri.parse("content://sms"),new String[]{"address","date","body"},null,null,null);
        while(cursor.moveToNext()) {
            Log.e(TAG,cursor.getString(0) + "   " + cursor.getString(1) +
                        "   " + cursor.getString(2));
        }

获取联系人信息：

Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");
Uri dataUri = Uri.parse("content://com.android.contacts/data");
// 获取联系人信息
private void queryContact() {
        Cursor cursor = resolver.query(uri,new String[]{"contact_id",},null,null,null);
        while (cursor.moveToNext()) {
            Log.e(TAG,cursor.getString(0) + "  联系人ID");
            String contact_id = cursor.getString(0);
            if (contact_id != null) {
                Cursor dataCursor = resolver.query(dataUri, new String[] {
                                "mimetype", "data1" }, "raw_contact_id=?",
                        new String[] { contact_id }, null);
                while(dataCursor.moveToNext()) {
                    String mimetype = dataCursor.getString(0);  // 获取到mimeyType
                    String data1 = dataCursor.getString(1);
                    //String name = dataCursor.getString(3);

                    // 3 然后根据 mimetype类型 来区分数据类型
                    if ("vnd.android.cursor.item/email_v2".equals(mimetype)) {
                        //info.setEmail(data1);

                    } else if ("vnd.android.cursor.item/name".equals(mimetype)) {

                        //info.setName(data1);
                        Log.e(TAG,"data---姓名：-" + data1);

                    } else if ("vnd.android.cursor.item/phone_v2"
                            .equals(mimetype)) {
                        Log.e(TAG,"data---电话号码-" + data1);

                        //info.setPhone(data1);
                    }}}}}