Java tutorial
/* * Copyright 2011 Alex Fu * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.gmail.at.faint545.activities; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.lang.ref.WeakReference; import java.util.ArrayList; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.ProgressDialog; import android.os.AsyncTask; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import com.gmail.at.faint545.R; import com.gmail.at.faint545.Remote; import com.gmail.at.faint545.SabnzbdConstants; import com.gmail.at.faint545.tasks.QueueActionTask.QueueActionTaskListener; public class SpeedLimitActivity extends Activity implements QueueActionTaskListener { private EditText valueEditText; private Button ok; private Remote target; @Override protected void onCreate(Bundle savedInstanceState) { target = getIntent().getParcelableExtra("remote"); setContentView(R.layout.speed_limit); onCreateView(); super.onCreate(savedInstanceState); } private void onCreateView() { setTitle("Set Speed Limit"); valueEditText = (EditText) findViewById(R.id.speed_limit_value); ok = (Button) findViewById(R.id.speed_limit_ok); ok.setEnabled(false); initListeners(); } private void initListeners() { valueEditText.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void afterTextChanged(Editable s) { if (s.length() < 1) ok.setEnabled(false); else ok.setEnabled(true); } }); ok.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { String value = valueEditText.getText().toString(); new SpeedLimitTask(SpeedLimitActivity.this, target.buildURL(), target.getApiKey()).execute(value); } }); } @Override public void onQueueDeleteFinished(String result) { } @Override public void onQueuePauseFinished(String result) { } @Override public void onQueueResumeFinished(String result) { } @Override public void onSpeedLimitFinished(String result) { } private static class SpeedLimitTask extends AsyncTask<String, Void, String> { private ProgressDialog progressDialog; private String url; private String api; private WeakReference<Activity> mWeakContext; public SpeedLimitTask(Activity context, String url, String api) { this.url = url; this.api = api; mWeakContext = new WeakReference<Activity>(context); } @Override protected void onPreExecute() { progressDialog = ProgressDialog.show(mWeakContext.get(), null, "Setting speed limit"); super.onPreExecute(); } @Override protected String doInBackground(String... params) { HttpClient httpClient = new DefaultHttpClient(); HttpPost httpRequest = new HttpPost(url); ArrayList<NameValuePair> arguments = new ArrayList<NameValuePair>(); arguments.add(new BasicNameValuePair(SabnzbdConstants.APIKEY, api)); arguments.add(new BasicNameValuePair(SabnzbdConstants.OUTPUT, SabnzbdConstants.OUTPUT_JSON)); prepareForSpeedLimit(arguments, params); try { httpRequest.setEntity(new UrlEncodedFormEntity(arguments)); HttpResponse result = httpClient.execute(httpRequest); InputStream inStream = result.getEntity().getContent(); BufferedReader br = new BufferedReader(new InputStreamReader(inStream), 8); StringBuilder jsonStringBuilder = new StringBuilder(); String line; while ((line = br.readLine()) != null) { if (line.length() > 0) jsonStringBuilder.append(line); } br.close(); inStream.close(); return jsonStringBuilder.toString(); } catch (ClientProtocolException e) { return ClientProtocolException.class.getName(); } catch (IOException e) { return IOException.class.getName(); } } @Override protected void onPostExecute(String result) { try { String results = new JSONObject(result).getString(SabnzbdConstants.STATUS); if (Boolean.parseBoolean(results)) { Toast.makeText(mWeakContext.get(), "Speed limit set!", Toast.LENGTH_SHORT).show(); mWeakContext.get().finish(); } else { Toast.makeText(mWeakContext.get(), R.string.generic_error, Toast.LENGTH_SHORT).show(); } } catch (JSONException e) { e.printStackTrace(); } cleanup(); super.onPostExecute(result); } private void cleanup() { progressDialog.dismiss(); progressDialog = null; url = null; api = null; } private void prepareForSpeedLimit(ArrayList<NameValuePair> arguments, String... params) { arguments.add(new BasicNameValuePair(SabnzbdConstants.MODE, SabnzbdConstants.MODE_CONFIG)); arguments.add(new BasicNameValuePair(SabnzbdConstants.NAME, SabnzbdConstants.SPEEDLIMIT)); arguments.add(new BasicNameValuePair(SabnzbdConstants.VALUE, params[0])); } } }