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July 28, 2021 21:31
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Volley Tutorial Part 2
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<?xml version="1.0" encoding="utf-8"?> | |
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:app="http://schemas.android.com/apk/res-auto" | |
xmlns:tools="http://schemas.android.com/tools" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
android:padding="16dp" | |
tools:context="com.codinginflow.volleysingletonexample.MainActivity"> | |
<TextView | |
android:id="@+id/text_view_result" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:textColor="@android:color/black" | |
android:textSize="20sp" /> | |
<Button | |
android:id="@+id/button_parse" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_alignParentBottom="true" | |
android:layout_centerHorizontal="true" | |
android:layout_marginBottom="29dp" | |
android:text="parse" /> | |
</RelativeLayout> |
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<?xml version="1.0" encoding="utf-8"?> | |
<manifest xmlns:android="http://schemas.android.com/apk/res/android" | |
package="com.codinginflow.volleysingletonexample"> | |
<uses-permission android:name="android.permission.INTERNET" /> | |
<application | |
android:allowBackup="true" | |
android:icon="@mipmap/ic_launcher" | |
android:label="@string/app_name" | |
android:roundIcon="@mipmap/ic_launcher_round" | |
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> |
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package com.codinginflow.volleysingletonexample; | |
import android.support.v7.app.AppCompatActivity; | |
import android.os.Bundle; | |
import android.view.View; | |
import android.widget.Button; | |
import android.widget.TextView; | |
import com.android.volley.Request; | |
import com.android.volley.RequestQueue; | |
import com.android.volley.Response; | |
import com.android.volley.VolleyError; | |
import com.android.volley.toolbox.JsonObjectRequest; | |
import org.json.JSONArray; | |
import org.json.JSONException; | |
import org.json.JSONObject; | |
public class MainActivity extends AppCompatActivity { | |
private TextView mTextViewResult; | |
private RequestQueue mQueue; | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_main); | |
mTextViewResult = findViewById(R.id.text_view_result); | |
Button buttonParse = findViewById(R.id.button_parse); | |
mQueue = VolleySingleton.getInstance(this).getRequestQueue(); | |
buttonParse.setOnClickListener(new View.OnClickListener() { | |
@Override | |
public void onClick(View v) { | |
jsonParse(); | |
} | |
}); | |
} | |
private void jsonParse() { | |
String url = "https://api.myjson.com/bins/kp9wz"; | |
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, | |
new Response.Listener<JSONObject>() { | |
@Override | |
public void onResponse(JSONObject response) { | |
try { | |
JSONArray jsonArray = response.getJSONArray("employees"); | |
for (int i = 0; i < jsonArray.length(); i++) { | |
JSONObject employee = jsonArray.getJSONObject(i); | |
String firstName = employee.getString("firstname"); | |
int age = employee.getInt("age"); | |
String mail = employee.getString("mail"); | |
mTextViewResult.append(firstName + ", " + String.valueOf(age) + ", " + mail + "\n\n"); | |
} | |
} catch (JSONException e) { | |
e.printStackTrace(); | |
} | |
} | |
}, new Response.ErrorListener() { | |
@Override | |
public void onErrorResponse(VolleyError error) { | |
error.printStackTrace(); | |
} | |
}); | |
mQueue.add(request); | |
} | |
} |
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package com.codinginflow.volleysingletonexample; | |
import android.content.Context; | |
import com.android.volley.RequestQueue; | |
import com.android.volley.toolbox.Volley; | |
public class VolleySingleton { | |
private static VolleySingleton mInstance; | |
private RequestQueue mRequestQueue; | |
private VolleySingleton(Context context) { | |
mRequestQueue = Volley.newRequestQueue(context.getApplicationContext()); | |
} | |
public static synchronized VolleySingleton getInstance(Context context) { | |
if (mInstance == null) { | |
mInstance = new VolleySingleton(context); | |
} | |
return mInstance; | |
} | |
public RequestQueue getRequestQueue() { | |
return mRequestQueue; | |
} | |
} |
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