问题描述
我可以选择和显示所有的从数据库中的图像。现在我特林按ID过滤。我如何通过id来获取图像从数据库？
I can select and show all the images from the db. Now I am tring to filter them by id. How do I get images from db by id?
有没有办法从数据库中选择了imovel_idJSON响应比较的AsyncTask里面的字符串imovel_id？
Is there a way to compare the string "imovel_id" inside the AsyncTask with the "imovel_id" json response selected from the db?
还是更通过要求从Android应用程序发送到得到字符串imovel_id，然后按imovel_id全选图像？
Or is it better to get the string "imovel_id" via request sent from the android app and then select all the images by "imovel_id"?
我想，在低于code从AsyncTask的发送串，得到它在PHP请求，然后使用带WHERE clausule查询，但我没有成功。我得到一个空值。
I tried that on the below code sending the string from the AsyncTask, getting it on php request and then using the query with WHERE clausule but I had no success. I get a null value.
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("imovel_id", i_id));
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://meuwebsite.com/panel/json_images.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
Log.e("pass 1", "connection success ");
} catch (Exception e) {
Log.e("Fail 1", e.toString());
Toast.makeText(getApplicationContext(), "Invalid IP Address",
Toast.LENGTH_LONG).show();
}
try {
BufferedReader reader = new BufferedReader
(new InputStreamReader(inputStream, "UTF-8"));
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
inputStream.close();
result = sb.toString();
Log.e("pass 2", "connection success ");
} catch (Exception e) {
Log.e("Fail 2", e.toString());
}
try {
JSONObject json_data = new JSONObject(result);
i_id = (json_data.getString("imovel_id"));
Log.e("pass 1", "id do imovel = " + i_id);
} catch (Exception e) {
Log.e("Fail 3", e.toString());
}
Integer result = 0;
try {
// Create Apache HttpClient
HttpClient httpclient = new DefaultHttpClient();
HttpResponse httpResponse = httpclient.execute(new HttpGet(params[0]));
int statusCode = httpResponse.getStatusLine().getStatusCode();
// 200 represents HTTP OK
if (statusCode == 200) {
String response = streamToString(httpResponse.getEntity().getContent());
parseResult(response);
result = 1; // Successful
} else {
result = 0; //"Failed
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result;
}
@Override
protected void onPostExecute(Integer result) {
// Download complete. Lets update UI
if (result == 1) {
mGridAdapter.setGridData(mGridData);
} else {
Toast.makeText(GridViewActivity.this, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
}
//Hide progressbar
mProgressBar.setVisibility(View.GONE);
}
}
String streamToString(InputStream stream) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream));
String line;
String result = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
// Close stream
if (null != stream) {
stream.close();
}
return result;
}
/**
* Parsing the feed results and get the list
*
* @param result
*/
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("posts");
GridItem item;
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
item = new GridItem();
item.setImage(post.getString("images"));
mGridData.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
PHP脚本
include_once 'db_connect.php';
$i_id = $_REQUEST["imovel_id"];
$sql = "SELECT * FROM iMoveis WHERE imovel_id='$i_id'";
$result = mysqli_query($mysqli, $sql);
$response = array();
$images = array();
while($row = mysqli_fetch_assoc($result)){
$images[] = array('images' => $row['img1']);
$images[] = array('images' => $row['img2']);
$images[] = array('images' => $row['img3']);
$images[] = array('images' => $row['img4']);
$images[] = array('images' => $row['img5']);
}
$response['posts'] = $images;
echo json_encode($response, JSON_UNESCAPED_SLASHES);
添加JSON数组里面的ID，然后将其从TextView的比较parseResult方法使用字符串imovel_id里面可能是一个解决方案吗？
Adding the id inside the json array and then comparing it inside the parseResult method with the string "imovel_id" from the textview could be a solution?
我想，我已经做和使用WHERE查询过滤它会很容易被namevaluepairs中发送的字符串，但它似乎没有that's工作那么容易。
I thought it would be easy sending the string by nameValuePairs as I have already done and use a WHERE in the query to filter but it seems that´s not working so easily.
先谢谢了。
推荐答案
我改变了我的AsyncTask的一些修改
I made some changes in my AsyncTask
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("imovel_id", i_id));
Integer result = 0;
try {
// Create Apache HttpClient
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://meuwebsite.com/panel/json_images.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse httpResponse = httpclient.execute(httppost);
int statusCode = httpResponse.getStatusLine().getStatusCode();
// 200 represents HTTP OK
if (statusCode == 200) {
String response = streamToString(httpResponse.getEntity().getContent());
parseResult(response);
result = 1; // Successful
} else {
result = 0; //"Failed
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result;
}
@Override
protected void onPostExecute(Integer result) {
// Download complete. Lets update UI
if (result == 1) {
mGridAdapter.setGridData(mGridData);
} else {
Toast.makeText(GridViewActivity.this, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
}
//Hide progressbar
mProgressBar.setVisibility(View.GONE);
}
}
String streamToString(InputStream stream) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream));
String line;
String result = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
// Close stream
if (null != stream) {
stream.close();
}
return result;
}
/**
* Parsing the feed results and get the list
*
* @param result
*/
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("posts");
GridItem item;
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
item = new GridItem();
item.setImage(post.getString("images"));
mGridData.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
也改变 $ i_id = $ _REQUEST [imovel_id]; 到 $ i_id = $ _ POST [imovel_id];
这篇关于的Android + JSON度日ID图片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！