如何在同一屏幕上从JSON发送和接收数据
[英]how to send and receive data from JSON on same screen
问题描述
我正在创建一个应用程序，其中有一个搜索屏幕，该屏幕从用户那里获取搜索数据并将其发送到服务器，然后服务器将搜索结果发送回用户。
我的问题是我能够发送数据，但是我不知道如何在同一类中实现接收数据。 我创建了其他应用程序，它们在同一个类中发送或接收，但不是两者都发送。
我正在使用json解析来发送/接收数据。
在android代码中，我还没有完成接收部分，因为我不知道如何添加带有发送功能的接收功能。
对不起，我的英语不好。
这是我的PHP服务器代码
<?php
$hostname_localhost ="localhost";
$database_localhost ="testdb";
$username_localhost ="root";
$password_localhost ="";
$localhost = mysql_connect($hostname_localhost,$username_localhost,$password_localhost)
or
trigger_error(mysql_error(),E_USER_ERROR);
mysql_select_db($database_localhost, $localhost);
//$unique_id = $_POST['unique_id'];
$carat1 = $_POST['carat1'];
$carat2 = $_POST['carat2'];
$color1 = $_POST['color1'];
$color2 = $_POST['color2'];
$cut1 = $_POST['cut1'];
$cut2 = $_POST['cut2'];
$shape1 = $_POST['shape1'];
$shape2 = $_POST['shape2'];
$stones = $_POST['stones'];
//$query_search = "Select * from search where (unique_id, carat1, carat2, color1, color2 , cut1, cut2, shape1, shape2, stones ) VALUES('$unique_id', '$carat1','$carat2','$color1','$color2','$cut1', '$cut2', '$shape1', '$shape2', '$stones')";
$query_search ="Select * from search where carat = '$carat1' or carat = '$carat2' and color = '$color1' or color = '$color2' and cut = '$cut1' or cut = '$cut2' and shape = '$shape1 or shape = '$shape2' and stones ='$stones";
$query_exec = mysql_query($query_search) or die(mysql_error());
while($row=mysql_fetch_assoc($query_exec))
$json_output[]=$row;
echo "search";
print(json_encode($json_output));
mysql_close();
//$rows = mysql_num_rows($query_exec);
//echo $rows;
?>
这是我的android代码。
public class QuickSearch extends Activity {
Button search;
RadioGroup stones;
RadioButton single,twin,selected_value;
EditText to,from,unique_id;
TextView tv;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
ProgressDialog dialog = null;
Intent f1;
String radiovalue;
String str_color1,str_color2,str_clarity1, str_clarity2, str_shape1,str_shape2, str_cut1,str_cut2,str_carat1,str_carat2;
Spinner color1,color2,shape1,shape2,clarity1,clarity2,cut,cut2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quicksearch);
search=(Button)findViewById(R.id.search);
// submit=(Button)findViewById(R.id.submit);
to=(EditText)findViewById(R.id.to);
from=(EditText)findViewById(R.id.from);
// unique_id=(EditText)findViewById(R.id.unique_id);
tv = (TextView)findViewById(R.id.tv);
stones=(RadioGroup)findViewById(R.id.radioGroup);
single=(RadioButton)findViewById(R.id.single);
twin=(RadioButton)findViewById(R.id.twin);
f1 = new Intent(QuickSearch.this,Search_result.class);
color1=(Spinner)findViewById(R.id.color1);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.color1, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
color1.setAdapter(adapter);
color2=(Spinner)findViewById(R.id.color2);
ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, R.array.color2, android.R.layout.simple_spinner_item);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
color2.setAdapter(adapter2);
shape1=(Spinner)findViewById(R.id.shape);
ArrayAdapter<CharSequence> adapter3 = ArrayAdapter.createFromResource(this, R.array.shape, android.R.layout.simple_spinner_item);
adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
shape1.setAdapter(adapter3);
shape2=(Spinner)findViewById(R.id.shape2);
ArrayAdapter<CharSequence> adapter8 = ArrayAdapter.createFromResource(this, R.array.shape2, android.R.layout.simple_spinner_item);
adapter8.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
shape2.setAdapter(adapter8);
clarity1=(Spinner)findViewById(R.id.clarity1);
ArrayAdapter<CharSequence> adapter4 = ArrayAdapter.createFromResource(this,
R.array.clarity1, android.R.layout.simple_spinner_item);
adapter4.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
clarity1.setAdapter(adapter4);
clarity2=(Spinner)findViewById(R.id.clarity2);
ArrayAdapter<CharSequence> adapter5 = ArrayAdapter.createFromResource(this,R.array.clarity2, android.R.layout.simple_spinner_item);
adapter5.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
clarity2.setAdapter(adapter5);
cut=(Spinner)findViewById(R.id.cut);
ArrayAdapter<CharSequence> adapter6 = ArrayAdapter.createFromResource(this,R.array.cut, android.R.layout.simple_spinner_item);
adapter6.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
cut.setAdapter(adapter6);
cut2=(Spinner)findViewById(R.id.cut2);
ArrayAdapter<CharSequence> adapter7 = ArrayAdapter.createFromResource(this,R.array.cut2, android.R.layout.simple_spinner_item);
adapter7.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
cut2.setAdapter(adapter7);
search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
str_color1= color1.getSelectedItem().toString();
str_color2= color2.getSelectedItem().toString();
str_shape1=shape1.getSelectedItem().toString();
str_shape2=shape2.getSelectedItem().toString();
str_clarity2=clarity2.getSelectedItem().toString();
str_clarity1= clarity1.getSelectedItem().toString();
str_cut1=cut.getSelectedItem().toString();
str_cut2=cut2.getSelectedItem().toString();
str_carat1=to.getText().toString().trim();
str_carat2=from.getText().toString().trim();
int selectedId = stones.getCheckedRadioButtonId();
// find the radiobutton by returned id
selected_value = (RadioButton) findViewById(selectedId);
radiovalue= selected_value.getText().toString();
dialog = ProgressDialog.show(QuickSearch.this, "","Searching...", true);
if(str_color1=="Color To:" || str_color2=="Color From:" || str_clarity1=="Color To:" || str_clarity2 =="Color From:"
|| str_cut1 == "Cut To:" || str_cut2 == " Cut From:" || str_shape1=="Shape To:" || str_shape2 =="Shape From"
|| radiovalue=="" || str_carat1==null || str_carat2==null)
{
Toast.makeText(getApplicationContext(), "Please enter all the field", Toast.LENGTH_SHORT).show();
}
else
{
new Thread(new Runnable() {
public void run() {
Search();
}
}).start();
}}
});
}
void Search(){
try{
httpclient=new DefaultHttpClient();
httppost= new HttpPost("http://192.168.0.106/test/search.php"); // make sure the url is correct.
//add your data
nameValuePairs = new ArrayList<NameValuePair>(2);
// Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar,
nameValuePairs.add(new BasicNameValuePair("carat1",str_carat1.toString().trim()));
nameValuePairs.add(new BasicNameValuePair("carat2",str_carat2.toString().trim()));
nameValuePairs.add(new BasicNameValuePair("color1",str_color1.toString().trim()));
nameValuePairs.add(new BasicNameValuePair("color2",str_color2.toString().trim()));
nameValuePairs.add(new BasicNameValuePair("shape1",str_cut1.toString().trim()));
nameValuePairs.add(new BasicNameValuePair("shape2",str_cut2.toString().trim()));
nameValuePairs.add(new BasicNameValuePair("stones",radiovalue.toString().trim()));
// $Edittext_value = $_POST['Edittext_value'];
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Execute HTTP Post Request
response=httpclient.execute(httppost);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
final String response = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + response);
runOnUiThread(new Runnable() {
public void run() {
tv.setText("Response from PHP : " + response);
dialog.dismiss();
}
});
if(response.equalsIgnoreCase("Search")){
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(QuickSearch.this, "Searching Successful", Toast.LENGTH_SHORT).show();
}
});
// startActivity(new Intent(QuickSearch.this, LoginScreen.class));
//f1.putExtra("unique_id", unique_id.getText());
//st/artActivity(f1);
}else{
showAlert();
}
}catch(Exception e){
dialog.dismiss();
System.out.println("Exception : " + e.getMessage());
}
}
public void showAlert(){
QuickSearch.this.runOnUiThread(new Runnable() {
public void run() {
AlertDialog.Builder builder = new AlertDialog.Builder(QuickSearch.this);
builder.setTitle("Searching Error.");
builder.setMessage("Problem in Searching. Please try again later")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = builder.create();
alert.show();
}
});
}
}
这是从我的Android手机发送数据后，来自php服务器的响应。
8350-8350/com.diamond.traders W/InputEventReceiver﹕ Attempted to finish an input event but the input event receiver has already been disposed.
05-20 13:09:48.841 8350-8434/com.diamond.traders W/SingleClientConnManager﹕ Invalid use of SingleClientConnManager: connection still allocated.
Make sure to release the connection before allocating another one.
05-20 13:09:49.211 8350-8434/com.diamond.traders I/System.out﹕ Response : <br />
05-20 13:09:49.211 8350-8434/com.diamond.traders I/System.out﹕ <font size='1'><table class='xdebug-error xe-notice' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
05-20 13:09:49.211 8350-8434/com.diamond.traders I/System.out﹕ <tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Notice: Undefined index: cut1 in C:\wamp\www\test\search.php on line <i>17</i></th></tr>
05-20 13:09:49.211 8350-8434/com.diamond.traders I/System.out﹕ <tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
05-20 13:09:49.211 8350-8434/com.diamond.traders I/System.out﹕ <tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
05-20 13:09:49.211 8350-8434/com.diamond.traders I/System.out﹕ <tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0550</td><td bgcolor='#eeeeec' align='right'>146400</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp\www\test\search.php' bgcolor='#eeeeec'>..\search.php<b>:</b>0</td></tr>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ </table></font>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ <br />
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ <font size='1'><table class='xdebug-error xe-notice' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ <tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Notice: Undefined index: cut2 in C:\wamp\www\test\search.php on line <i>18</i></th></tr>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ <tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ <tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ <tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0550</td><td bgcolor='#eeeeec' align='right'>146400</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp\www\test\search.php' bgcolor='#eeeeec'>..\search.php<b>:</b>0</td></tr>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ </table></font>
05-20 13:09:49.221 8350-8434/com.diamond.traders I/System.out﹕ You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Signature Ideal' and stones ='Single' at line 1
2 个解决方案
解决方案1
1 2014-05-20 07:26:55
我现在没有IDE，但是您可以使用AsyncTask及其onPostExecute Callback尝试，如下所示：
//method in your Activity/Fragment to recieve data
private void askServer(String... params){
Search searcher = new Search(){
public void onPostExecute(String response){
//this method is called on UI-Thread when the Asynctask is finished
//check response for errors
if(response.equals("")){
Toast.makeText(MainActivity.this, "Error on response", Toast.LENGTH_SHORT).show();
}else{
//handle your response eg fill a textView etc pp
}
}
}
searcher.execute
}
//Your Asynctask
public class Search() extends Asynctask<String, Void, String>{
doInBackground(String param){
String response = "";
try{
httpclient=new DefaultHttpClient();
httppost= new HttpPost("http://192.168.0.106/test/search.php"); // make sure the url is correct.
//add your data
nameValuePairs = new ArrayList<NameValuePair>(2);
// Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar,
nameValuePairs.add(new BasicNameValuePair("carat1",param[0].trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Execute HTTP Post Request
response= httpclient.execute(httppost);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
response = httpclient.execute(httppost, responseHandler);
}catch(Exception e){
dialog.dismiss();
System.out.println("Exception : " + e.getMessage());
}
return response;
}
也看看DOCU
而这个很棒的教程页面LINK
解决方案2
0 2014-05-20 07:29:38
对于搜索功能，您不必使用PHP制作两个Web服务来进行发送和接收，对于每个搜索调用，搜索Web服务都将打印搜索结果。 在您的php代码中，您正在打印“搜索”，将其替换为从数据库中获取的结果，从android代码中的响应中获取结果，并显示它们而不是“搜索成功”。
如果不想更改服务，请在发送数据后调用接收部分，并在运行于UI线程上的线程中显示结果。
如何使用JSON从Android发送和接收数据？
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