package com.example.user.myapp;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(" http://gong.esy.es/json.php");
request.setHeader("User-Agent", "set your desired User-Agent");

try {
HttpResponse response = client.execute(request);

// Check if server response is valid
StatusLine status = response.getStatusLine();
if (status.getStatusCode() != 200) {
throw new IOException("Invalid response from server: " + status.toString());
}

// Pull content stream from response
HttpEntity entity = response.getEntity();
InputStream inputStream = entity.getContent();

ByteArrayOutputStream content = new ByteArrayOutputStream();

// Read response into a buffered stream
int readBytes = 0;
byte[] sBuffer = new byte[512];
while ((readBytes = inputStream.read(sBuffer)) != -1) {
content.write(sBuffer, 0, readBytes);
}

// Return result from buffered stream
String dataAsString = new String(content.toByteArray());

TextView tv;
tv = (TextView) findViewById(R.id.textview);
tv.setText(dataAsString);

} catch (IOException e) {
Log.d("error", e.getLocalizedMessage());
}

}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=" http://schemas.android.com/apk/res/android"
package="com.example.user.myapp" >
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "23.0.2"

defaultConfig {
applicationId "com.example.user.myapp"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
useLibrary 'org.apache.http.legacy'
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
compile 'org.apache.httpcomponents:httpcore:4.4.1'
compile 'org.apache.httpcomponents:httpclient:4.5'
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android=" http://schemas.android.com/apk/res/android"
xmlns:tools=" http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<TextView xmlns:android=" http://schemas.android.com/apk/res/android"
android:id="@+id/textview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="tedxt"

/>
</RelativeLayout>

12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: FATAL EXCEPTION: main
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.myapp/com.example.user.myapp.MainActivity}: android.os.NetworkOnMainThreadException
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2211)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.access$600(ActivityThread.java:149)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1300)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.os.Looper.loop(Looper.java:153)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:4987)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: Caused by: android.os.NetworkOnMainThreadException
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1125)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at java.net.InetAddress.getAllByName(InetAddress.java:214)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:365)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at com.example.user.myapp.MainActivity.onCreate(MainActivity.java:31)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5020)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2211) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.access$600(ActivityThread.java:149) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1300) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.os.Looper.loop(Looper.java:153) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:4987) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584) 
12-23 11:58:55.611 2330-2330/com.example.user.myapp E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method) 

<RelativeLayout xmlns:android=" http://schemas.android.com/apk/res/android"
xmlns:tools=" http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/editText1"
android:layout_below="@+id/editText1"
android:layout_marginTop="25dp"
android:ems="10"
android:inputType="textPassword" >
</EditText>

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="44dp"
android:ems="10" >

<requestFocus android:layout_width="wrap_content" />

</EditText>

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/editText1"
android:layout_alignParentLeft="true"
android:text="@string/Username" />

<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="@string/App"
android:textAppearance="?android:attr/textAppearanceLarge" />

<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView5"
android:layout_alignLeft="@+id/textView6"
android:text="@string/Role"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="10sp" />

<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView6"
android:layout_marginTop="27dp"
android:layout_toLeftOf="@+id/editText1"
android:text="@string/LoginRole" />
<TextView
android:id="@+id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView6"
android:layout_alignLeft="@+id/textView5"
android:layout_marginBottom="27dp"
android:text="@string/method" />

<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView8"
android:layout_below="@+id/button1"
android:layout_marginTop="86dp"
android:text="@string/LoginStatus" />


<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/textView4"
android:layout_centerHorizontal="true"
android:text="@string/Status"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="10sp" />

<TextView
android:id="@+id/textView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView8"
android:layout_alignLeft="@+id/textView6"
android:text="@string/Choose"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="10sp" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/textView6"
android:onClick="loginPost"
android:text="@string/LoginPost" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button2"
android:layout_alignBottom="@+id/button2"
android:layout_alignLeft="@+id/textView2"
android:onClick="login"
android:text="@string/LoginGet" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/editText2"
android:layout_alignBottom="@+id/editText2"
android:layout_alignParentLeft="true"
android:text="@string/Password" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">PHPMYSQL</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string name="Username">Username</string>
<string name="Password">Password</string>
<string name="LoginGet">Login - Get</string>
<string name="LoginPost">Login - Post</string>
<string name="App">Login Application</string>
<string name="LoginStatus">Login Status</string>
<string name="LoginRole">Login Role</string>
<string name="Status">Not login</string>
<string name="Role">Not assigned</string>
<string name="method">Login Method</string>
<string name="Choose">Choose Method</string>
</resources>

package com.example.phpmysql;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

private EditText usernameField,passwordField;
private TextView status,role,method;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

usernameField = (EditText)findViewById(R.id.editText1);
passwordField = (EditText)findViewById(R.id.editText2);

status = (TextView)findViewById(R.id.textView6);
role = (TextView)findViewById(R.id.textView7);
method = (TextView)findViewById(R.id.textView9);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.main, menu);
return true;
}

public void login(View view){
String username = usernameField.getText().toString();
String password = passwordField.getText().toString();
method.setText("Get Method");
new SigninActivity(this,status,role,0).execute(username,password);

}

public void loginPost(View view){
String username = usernameField.getText().toString();
String password = passwordField.getText().toString();
method.setText("Post Method");
new SigninActivity(this,status,role,1).execute(username,password);
}
}

package com.example.phpmysql;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.TextView;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;

public class SigninActivity extends AsyncTask<String,Void,String>{
private TextView statusField,roleField;
private Context context;
private int byGetOrPost = 0;

//flag 0 means get and 1 means post.(By default it is get.)
public SigninActivity(Context context,TextView statusField,TextView roleField,int flag) {
this.context = context;
this.statusField = statusField;
this.roleField = roleField;
byGetOrPost = flag;
}

protected void onPreExecute(){

}

@Override
protected String doInBackground(String... arg0) {
if(byGetOrPost == 0){ //means by Get Method

try{
String username = (String)arg0[0];
String password = (String)arg0[1];
String link = " http://gong.esy.es/usertest.php?username=" username "&password=" password;

URL url = new URL(link);
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI(link));
HttpResponse response = client.execute(request);
BufferedReader in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

StringBuffer sb = new StringBuffer("");
String line="";

while ((line = in.readLine()) != null) {
sb.append(line);
break;
}
in.close();
return sb.toString();
}

catch(Exception e){
return new String("Exception: " + e.getMessage());
}
}
else{
try{
String username = (String)arg0[0];
String password = (String)arg0[1];

String link=" http://gong.esy.es/usertest.php";
String data = URLEncoder.encode("username", "UTF-8") + "=" + URLEncoder.encode(username, "UTF-8");
data += "&" + URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(password, "UTF-8");

URL url = new URL(link);
URLConnection conn = url.openConnection();

conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());

wr.write( data );
wr.flush();

BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));

StringBuilder sb = new StringBuilder();
String line = null;

// Read Server Response
while((line = reader.readLine()) != null)
{
sb.append(line);
break;
}
return sb.toString();
}
catch(Exception e){
return new String("Exception: " + e.getMessage());
}
}
}

@Override
protected void onPostExecute(String result){
if(result.trim().length() == 0){
this.statusField.setText("Login Failed");
} else {
this.statusField.setText("Login Successful");
}
this.roleField.setText(result);
}


}

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "23.0.2"

defaultConfig {
applicationId "com.example.phpmysql"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
useLibrary 'org.apache.http.legacy'
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
compile 'org.apache.httpcomponents:httpcore:4.4.1'
compile 'org.apache.httpcomponents:httpclient:4.5'
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=" http://schemas.android.com/apk/res/android"
package="com.example.phpmysql"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<application
android:allowBackup="true"
android:label="@string/app_name"
android:theme="@style/AppTheme" >

<activity
android:name="com.example.phpmysql.MainActivity"
android:label="@string/app_name" >

<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

</activity>

</application>
</manifest>