Created
November 7, 2015 18:16
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Intro App: Async Task
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<!-- This stuff goes inside of your manifest tags --> | |
<uses-permission android:name="android.permission.INTERNET"/> | |
<application | |
android:allowBackup="true" | |
android:icon="@mipmap/ic_launcher" | |
android:label="@string/app_name" | |
android:theme="@style/AppTheme" > | |
<activity | |
android:name=".ViewPostActivity" | |
android:label="@string/app_name" > | |
</activity> | |
<activity | |
android:name=".PickPostActivity" | |
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> | |
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public class LoadPostTask extends AsyncTask<Integer, Void, JSONObject> { | |
private static final String LOG_TAG = LoadPostTask.class.getSimpleName(); | |
private TextView titleView; | |
private TextView bodyView; | |
public LoadPostTask(TextView titleView, TextView bodyView) { | |
this.titleView = titleView; | |
this.bodyView = bodyView; | |
} | |
@Override | |
protected JSONObject doInBackground(Integer... postId) { | |
JSONObject jsonObject = null; | |
try { | |
URL url = new URL("http://jsonplaceholder.typicode.com/posts/" + postId[0].toString()); | |
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); | |
try { | |
InputStream in = new BufferedInputStream(urlConnection.getInputStream()); | |
jsonObject = readStream(in); | |
} catch (Exception e) { | |
Log.e(LOG_TAG, "Exception when connecting: "+e.getMessage()); | |
} finally{ | |
urlConnection.disconnect(); | |
} | |
} catch (Exception e) { | |
Log.e(LOG_TAG, "Exception when parsing: "+e.getMessage()); | |
} | |
return jsonObject; | |
} | |
public JSONObject readStream(InputStream inputStream) throws Exception { | |
BufferedReader streamReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8")); | |
StringBuilder responseStrBuilder = new StringBuilder(); | |
String inputStr; | |
while ((inputStr = streamReader.readLine()) != null) { | |
responseStrBuilder.append(inputStr); | |
} | |
return new JSONObject(responseStrBuilder.toString()); | |
} | |
@Override | |
protected void onPostExecute(JSONObject jsonObject) { | |
super.onPostExecute(jsonObject); | |
if (jsonObject == null) { | |
return; | |
} | |
try { | |
String titleString = jsonObject.getString("title"); | |
String bodyString = jsonObject.getString("body"); | |
titleView.setText(titleString); | |
bodyView.setText(bodyString); | |
} catch (JSONException e) { | |
e.printStackTrace(); | |
} | |
} | |
} |
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