Я опаздываю здесь, но вы можете сделать это с помощью XMLHttpRequest
и blob.
var xhr = new XMLHttpRequest();
xhr.responseType = 'blob'; //so you can access the response like a normal URL
xhr.onreadystatechange = function () {
if (xhr.readyState == XMLHttpRequest.DONE && xhr.status == 200) {
var img = document.createElement('img');
img.src = URL.createObjectURL(xhr.response); //create <img> with src set to the blob
document.body.appendChild(img);
}
};
xhr.open('GET', 'http://images.example.com/my_secure_image.png', true);
xhr.setRequestHeader('SecretPassword', 'password123');
xhr.send();
Если вы хотите, вы можете проверить, чтобы убедиться, что тип MIME блоба - это изображение.
Вы должны добавить первый вызов AsyncTask перед инициализацией просмотров, а затем при каждом следующем нажатии кнопки вы должны увеличить id на 1.
package com.example.android.quiz_app_androidmodule;
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;
import android.os.AsyncTask;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class MainActivity extends AppCompatActivity {
ConnectionClass connectionClass;
TextView Question, Score;
Button btnlogin, btnA, btnB, btnC, btnStart;
DoLogin doLogin ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
connectionClass = new ConnectionClass();
btnlogin = (Button) findViewById(R.id.btnStart);
btnA = (Button) findViewById(R.id.button1);
btnB = (Button) findViewById(R.id.button2);
btnC = (Button) findViewById(R.id.button3);
Question = (TextView) findViewById(R.id.textViewQuestion);
Score = (TextView) findViewById(R.id.textViewScore);
doLogin.execute(id);
btnlogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Make sure your first id is 1;
id = id+1;
dologin = = new DoLogin()
doLogin.execute(id);
btnA.setVisibility(View.VISIBLE);
btnB.setVisibility(View.VISIBLE);
btnC.setVisibility(View.VISIBLE);
Question.setVisibility(View.VISIBLE);
Score.setVisibility(View.VISIBLE);
btnlogin.setVisibility(View.GONE);
}
});
}
String z = "";
String zA = "";
String zB="";
String zC="";
int id = 0;
int points;
public class DoLogin extends AsyncTask<String, String, String> {
Boolean isSuccess = false;
@Override
protected void onPostExecute(String r) {
if (isSuccess) {
Question.setText(z);
btnA.setText(zA);
btnB.setText(zB);
btnC.setText(zC);
}
}
@Override
protected String doInBackground(String... params) {
String id = params[0];
try {
Connection con = connectionClass.CONN();
if (con == null) {
z = "Error in connection with SQL server";
} else {
String query = "select question from Question where quizID >= "+id;
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
String queryA = "select optionOne from Options where quizID >= "+id;
Statement stmtA = con.createStatement();
ResultSet rsA = stmtA.executeQuery(queryA);
String queryB = "select optionTwo from Options where quizID >= "+id;
Statement stmtB = con.createStatement();
ResultSet rsB = stmtB.executeQuery(queryB);
String queryC = "select optionThree from Options where quizID >= "+id;
Statement stmtC = con.createStatement();
ResultSet rsC = stmtC.executeQuery(queryC);
if (rs.next() | rsA.next() | rsB.next() | rsC.next()) {
z = rs.getString(id).toString();
zA=rsA.getString(id).toString();
zB=rsB.getString(id).toString();
zC=rsC.getString(id).toString();
isSuccess = true;
}
else {
z = "Invalid Credentials";
isSuccess = false;
}
}
} catch (Exception ex) {
isSuccess = false;
z = "Exceptions";
}
return z;
}
}
}