我正试图使用POST方法将数据从android发送到php
php部分是单独测试的,它100%正常工作,并返回一个json字符串作为假定的
android部分不工作它不会打印错误甚至是所需的响应
这是代码,它经过了测试,使用Toast打印了一个字符串"test",但它在截击代码中没有改变:(
这是php代码:
<?php
require_once(__DIR__.'/../dbConnect.php');
$userName=$_POST['username'];
$query = "SELECT * FROM users WHERE username='$userName'";
$result = pg_query($con, $query);
$rows = pg_num_rows($result);
while ($row = pg_fetch_row($result))
{
$field = pg_num_fields( $result );
for ( $i = 0; $i < $field; $i++ ) {
$name = pg_field_name( $result, $i );
$user_arr[$name] = $row[$i];
}
}
echo json_encode($user_arr);
pg_close($con);
?>
这是安卓代码:
初始化测试字符串以显示输出
String test = "none";
这就是我称之为的方法
setUserData(username);
Toast.makeText(LoginActivity.this, test, Toast.LENGTH_SHORT).show();
这就是方法:
private void setUserData(final String username)
{
StringRequest strReq = new StringRequest(Request.Method.POST,
Server.GET_USERDATA_URL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
test= "test = "+response;
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(LoginActivity.this, volleyError.getMessage().toString(), Toast.LENGTH_LONG).show();
}
})
{
@Override
protected Map<String, String> getParams() {
// Posting parameters to getData url
Map<String, String> params = new HashMap<String, String>();
params.put(Server.KEY_USERNAME, username);
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(strReq);
}
您遇到了并发问题。当您执行setUserData(username)
方法时,Volley正在后台线程上执行工作。因此,您需要等待响应,然后才能在Toast中显示它。在你打电话的那一刻:
Toast.makeText(LoginActivity.this, test, Toast.LENGTH_SHORT).show();
服务器仍然没有响应,test
仍然是none
。您需要从onResponse
回调调用toast:
private void setUserData(final String username) {
StringRequest strReq = new StringRequest(
Request.Method.POST,
Server.GET_USERDATA_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
test = "test = "+response;
showToast();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(LoginActivity.this, volleyError.getMessage().toString(), Toast.LENGTH_LONG).show();
}
})
{
@Override
protected Map<String, String> getParams() {
// Posting parameters to getData url
Map<String, String> params = new HashMap<String, String>();
params.put(Server.KEY_USERNAME, username);
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(strReq);
}
private void showToast() {
Toast.makeText(LoginActivity.this, test, Toast.LENGTH_SHORT).show();
}
检查您是否获得了互联网权限。
在中添加吐司
onResponse()
Toast.makeText(LoginActivity.this, response.toString(), Toast.LENGTH_LONG).show();